A UNITED STATES DEPARTMENT OF COMMERCE

PUBLICATION

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NBS TECHNICAL NOTE 737

Interior/Exterior Noise Levels

of Over-the-Road Trucks:

Report of Tests

U.S.

MENT

OF

IMMERCE

National au

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NATIONAL BUREAU OF STANDARDS

The National Bureau of Standards1 was established by an act of Congress March 3,

1 901 . The Bureau's overall goal is to strengthen and advance the Nation's science and

technology and facilitate their effective application for public benefit. To this end, the Bureau conducts research and provides: (1) a basis for the Nation's physical measure- ment system, (2) scientific and technological services for industry and government, (3) a technical basis for equity in trade, and (4) technical services to promote public safety.

The Bureau consists of the Institute for Basic Standards, the Institute for Materials

Research, the Institute for Applied Technology, the Center for Computer Sciences and

Technology, and the Office for Information Programs.

THE INSTITUTE FOR BASIC STANDARDS provides the central basis within the United States of a complete and consistent system of physical measurement; coordinates

that system with measurement systems of other nations; and furnishes essential services leading to accurate and uniform physical measurements throughout the Nation's scientific community, industry, and commerce. The Institute consists of a Center for Radiation Research, an Office of Measurement Services and the following divisions: Applied Mathematics—Electricity—Heat—Mechanics—Optical Physics—Linac

Radiation2—Nuclear Radiation2—Applied Radiation2—Quantum Electronics3—

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. THE INSTITUTE FOR MATERIALS RESEARCH conducts materials research lead- ing to improved methods of measurement, standards, and data on the properties of

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THE INSTITUTE FOR APPLIED TECHNOLOGY provides technical services to pro- mote the use of available technology and to facilitate technological innovation in industry and Government; cooperates with public and private organizations leading to the development of technological standards (including mandatory safety standards), codes

and methods of test; and provides technical advice and services to Government agencies

upon request. The Institute also monitors NBS engineering standards activities and

provides liaison between NBS and national and international engineering standards

bodies. The Institute consists of the following divisions and offices: Engineering Standards Services—Weights and Measures—Invention and

Innovation—Product Evaluation Technology—Building Research—Electronic Technology—Technical Analysis—Measurement Engineering—Office of Fire Programs.

THE CENTER FOR COMPUTER SCIENCES AND TECHNOLOGY conducts re- search and provides technical services designed to aid Government agencies in improving cost effectiveness in the conduct of their programs through the selection, acquisition,

and effective utilization of automatic data processing equipment; and serves as the principal focus within the executive branch for the development of Federal standards for automatic data processing equipment, techniques, and computer languages. The Center

consists of the following offices and divisions: Information Processing Standards—Computer Information—Computer Services —Systems Development—Information Processing Technology.

THE OFFICE FOR INFORMATION PROGRAMS promotes optimum dissemination

and accessibility of scientific information generated within NBS and other agencies of

the Federal Government; promotes the development of the National Standard Reference Data System and a system of information analysis centers dealing with the broader

aspects of the National Measurement System; provides appropriate services to ensure

that the NBS staff has optimum accessibility to the scientific information of the world,

and directs the public information activities of the Bureau. The Office consists of the following organizational units: Office of" Standard Reference Data—Office of Technical Information and

Publications—Library—Office of International Relations.

1 Headquarters and Laboratories at Gaithersburg, Maryland, unless otherwise noted; mailing address Washington, DC. 20234.

- Part of the Center for Radiation Research.

3 Located at Boulder, Colorado 80302.
OCT 4 B72

S3

73*!

u

Interior/Exterior Noise Levels

of Over-ihe-Road Trucks:

Report of Tests

William A. Leasure, Jr., Thomas L. Quindry,

Denzil E. Mathews, and James M. Heinen

Building Research Division

Institute for Applied Technology

National Bureau of Standards

Washington, D.C. 20234

H3 1

$ ml a<" ^jj

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U.S. DEPARTMENT OF COMMERCE, Peter G. Peterson, Secretary

NATIONAL BUREAU OF STANDARDS, Lawrence M. Kushner, Acting Director,

Issued September 1972
National Bureau of Standards Technical Note 737

Nat. Bur. Stand. (U.S.), Tech. Note 737,3 17 pages (Sept. 1972) CODEN: NBTNAE

For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402 (Order by SD Catalog No. C13.46:737). Price $2.25.
TABLE OF CONTENTS

PAGE

1. Introduction 1

2. Field Test Program .

2.1. Field Test Site 2 2.2. Test Vehicles 3 2.3. Vehicle Operation Procedure 3

a. Stationary Tests 5 b. Moving Tests .5

2.4. Noise Measurement Systems 6

a. Exterior Measurements 6

b. Interior Measurements 9

2.5. Data Analysis 1°

3. Test Results H

4. References „ 305

List of Figures and Illustrations

Figure 1. View of test section showing physical layout and

placement of instrumentation „ 4

Figure 2. Data acquisition system for the measurement and

recording of exterior truck noise » . 7

Figure 3. View of a test vehicle passing the microphone array. ... 8

Figure 4. The microphone locations for interior cab noise

measurements 9

Figure 5. Data acquisition system for the measurement and recording

of interior cab noise 10

Figure 6. Data reduction and analysis system 10

in
Test Results

Rather than continue with sequential numbering of figures and tables,

it was felt that for the purpose of clarity, the figures and tables in this

section should be keyed to the particular test vehicle through the use of a double numerical designation, e.g., figure 1-1. The initial number

corresponds to the vehicle number and the second to the sequential

presentation of data for test runs for that particular vehicle.

Each vehicle was tested utilizing five different operation procedures

and each test was number coded as follows: test 1-low idle; test 2-stationary

acceleration and high idle; test 3-simulated city start-up; test 4-acceleratioi

test according to SAE Standard J366; test 5-deceleration test according to

SAE Standard J366.

Truck 1

Figure 1-1. View of test vehicle number 1 14

Table 1-1 . Maximum A-weighted sound levels as measured at the six

exterior microphone locations for all test runs for

vehicle number 1 16

Figure 1-2. Truck 1, Test 1, Runs 1,2. (Exterior) 17

Figure 1-3. Truck 1, Test 2, Run 4. (Exterior) 18

Figure 1-4. Truck 1, Test 2, Runs 5,6. (Exterior) 19

Figure 1-5. Truck 1, Test 3, Runs 7,8. (Exterior) 20

Figure 1-6. Truck 1, Test 3, Runs 9,10. (Exterior) . 21

Figure 1-7. Truck 1, Test 4, Runs 11,12. (Exterior) 22

Figure 1-8. Truck 1, Test 4, Runs 13,14. (Exterior) 23

Figure 1-9. Truck 1, Test 5 (without exhaust brake), Runs 15,16

(Exterior) 24

Figure 1-10. Truck 1, Test 5 (without exhaust brake), Runs 17,18

(Exterior) 25

Figure 1-11. Truck 1, Test 5 (with exhaust brake), Runs 19,20

(Exterior) 26

Figure 1-12. Truck 1, Test 5 (with exhaust brake), Runs 21,22

(Exterior) 27

Table 1-2 . Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test, runs for

vehicle number 1 29

Figure 1-13. Truck 1, Tests 1,2, Runs 2-6. (Interior) 30

Figure 1-14. Truck 1, Test 3, Runs 7-10. (Interior) 31

Figure 1-15. Truck 1, Test 4, Runs 11-14. (Interior) 32

Figure 1-16. Truck 1, Test 5 (without exhaust brake), Runs 15-18

(Interior) 33

Figure 1-17. Truck 1, Test 5 (with exhaust brake), Runs 19-22

(Interior) 34

IV
Truck 2

Figure 2-1.

Table 2-1 .

Figure 2-2.

Figure 2-3.

Figure 2-4,

Figure 2-5.

Table 2-2.

.

Figure 2-6.

Figure 2-7.

Figure 2-8.

Figure 3-1.

Table 3-1 .

Figure 3-2.

Figure 3-3.

Figure 3-4.

Figure 3-5.

Figure 3-6.

Figure 3-7.

Figure 3-8.

Figure 3-9.

Figure 3-10,

Table 3-2 .

Figure 3-11,

Figure 3-12,

Figure 3-13,

Figure 3-14,

View of test vehicle number 2...„.......... 36

Maximum A-weighted sound levels as measured at the

six exterior microphone locations for all test runs

for vehicle number 2 38

Truck 2, Test 4, Runs 11,12. (Exterior) 39

Truck 2, Test 4, Runs 13,14. (Exterior) 40

Truck 2, Test 5, Runs 15,16. (Exterior) 41

Truck 2, Test 5, Run 18. (Exterior) 42

Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test runs for

vehicle number 2 43

Truck 2, Test 4 (internal door closed), Runs 11-14.

(Interior) 44

Truck 2, Test 4 (internal door open), Runs 15-18.

(Interior) 45

Truck 2, Test 5 (internal door closed), Runs 19-22.

(Interior) x 46

Truck 3

View of test vehicle number 3 48

Maximum A-weighted sound levels as measured at the six

exterior microphone locations for all test runs for

vehicle number 3 50

Truck 3, Test 1, Runs 1,2. (Exterior) 51

Truck 3, Test 2, Runs 3,4. (Exterior) 52

Truck 3, Test 2, Runs 5,6. (Exterior) 53

Truck 3, Test 3, Runs 7,8. (Exterior) 54

Truck 3, Test 3, Runs 9,10. (Exterior) 55

Truck 3, Test 4, Runs 11,12. (Exterior) 56

Truck 3, Test 4, Runs 13,14. (Exterior) 57

Truck 3, Test 5, Runs 15,16. (Exterior) 58

Truck 3, Test 5, Runs 17,18. (Exterior) 59

Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test runs for

vehicle number 3 61

Truck 3, Tests 1,2, Runs 1-6. (Interior) 62

Truck 3, Test 3, Runs 7-10. (Interior) 63

Truck 3, Test 4, Runs 11-14. (Interior) 64

Truck 3, Test 5, Runs 15-18. (Interior) 65
Truck 4

Figure 4-1. View of test vehicle number 4 68

Table 4-1 . Maximum A-weighted sound levels as measured at the six

exterior microphone locations for all test runs for

vehicle number 4 70

Figure 4-2. Truck 4, Test 1, Runs 1,2. (Exterior) 71

Figure 4-3. Truck 4, Test 2, Runs 3,4. (Exterior) 72

Figure 4-4. Truck 4, Test 2, Runs 5,6. (Exterior) 73

Figure 4-5. Truck 4, Test 3, Runs 7,8. (Exterior) 74

Figure 4-6. Truck 4, Test 3, Runs 9,10. (Exterior) 75

Figure 4-7. Truck 4, Test 4, Runs 11,12. (Exterior) 76

Figure 4-8. Truck 4, Test 4, Runs 13,14. (Exterior) 77

Figure 4-9. Truck 4, Test 5, Runs 15,16. (Exterior) 78

Figure 4-10. Truck 4, Test 5, Runs 17,18. (Exterior) 79

Table 4-2 . Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test runs for

vehicle number 4 81

Figure 4-11. Truck 4, Tests 1,2, Runs 1-6. (Interior) 82

Figure 4-12. Truck 4, Test 3, Runs 7-10. (Interior) 83

Figure 4-13. Truck 4, Test 4, Runs 11-14. (Interior) 84

Figure 4-14. Truck 4, Test 5, Runs 15-18. (Interior) 85

Truck 5

Figure 5-1. View of test vehicle number 5 88

Table 5-1,. Maximum A-weighted sound levels as measured at the six

exterior microphone locations for all test runs for

vehicle number 5 90

Figure 5-2. Truck 5, Test 1, Runs 1,2. (Exterior) 91

Figure 5-3. Truck 5, Test 2, Runs 3,4. (Exterior) 92

Figure 5-4. Truck 5, Test 2, Runs 5,6. (Exterior) 93

Figure 5-5. Truck 5, Test 3, Runs 7,8. (Exterior) 94

Figure 5-6. Truck 5, Test 3, Runs 9,10. (Exterior) 95

Figure 5-7. Truck 5, Test 4, Runs 11,12. (Exterior) 96

Figure 5-8. Truck 5, Test 4, Runs 13,14. (Exterior) 97

Figure 5-9. Truck 5, Test 5, Runs. 15,16. (Exterior) 98

Figure 5-10. Truck 5, Test 5, Runs 17,18. (Exterior) 99

Table 5-2 . Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test runs for

vehicle number 5 101

Figure 5-11. Truck 5, Tests 1,2, Runs 1-6. (Interior) 102

Figure 5-12. Truck 5, Test 3, Runs 7-10., (Interior) 103

Figure 5-.13. Truck 5, Test 4 (with bedding), Runs 11-14..

(Interior) 104

Figure 5-14. Truck 5, Test 4 (without bedding), Runs 15-18,

(Interior) 105

Figure 5-15. Truck 5, Test 5 (with bedding), Runs 19-22.

(Interior) 106

VI
Truck 6

Figure 6-1. View of test vehicle number 6 108

Table 6-1 . Maximum A-weighted sound levels as measured at the six

exterior microphone locations for all test runs for

vehicle number 6 110

Figure 6-2. Truck 6, Test 1, Runs 1,2. (Exterior) Ill

Figure 6-3. Truck 6, Test 2, Runs 3,4. (Exterior) 112

Figure 6-4. Truck 6, Test 2, Runs 5,6. (Exterior) 113

Figure 6-5. Truck 6, Test 3, Runs 7,8. (Exterior) 114

Figure 6-6. Truck 6, Test 3, Runs 9,10, (Exterior)* 115

Figure 6-7. Truck 6, Test 4, Runs 11,12. (Exterior) 116

Figure 6-8. Truck 6, Test 4, Runs 13,14. (Exterior) 117

Figure 6-9. Truck 6, Test 5, Runs 15,16.. (Exterior) 118

Figure 6-10. Truck 6, Test 5, Runs 17,18. (Exterior) 119

Table 6-2 . Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test runs for

vehicle number 6 121

Figure 6-11. Truck 6, Tests 1,2, Runs 1-6. (Interior) 122

Figure 6-12. Truck 6, Test 3, Runs 7-10. (Interior) 123

Figure 6-13. Truck 6, Test 4, Runs 11-14. (Interior) 124

Figure 6-14. Truck 6, Test 5, Runs 15-18. (Interior) 125

Truck 7

Figure 7-1. View of test vehicle number 7 128

Table 7-1 . Maximum A-weighted sound levels as measured at the six

exterior microphone locations for all test runs for

vehicle number 7 130

Figure 7-2. Truck 7, Test 1, Runs 1,2. (Exterior) 131

Figure 7-3. Truck 7, Test 2, Runs 4,5. (Exterior) 132

Figure 7-4. Truck 7, Test 3, Runs 7,8. (Exterior) 133

Figure 7-5. Truck 7, Test 3, Runs 9,10. (Exterior) 134

Figure 7-6. Truck 7, Test 4, Runs 11,12. (Exterior) 135

Figure 7-7. Truck 7, Test 4, Runs 13,14. (Exterior) 136

Figure 7-8. Truck 7, Test 5, Runs 15,16. (Exterior) 137

Figure 7-9. Truck 7, Test 5, Runs 17,18. (Exterior) 138

Table 7-2 . Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test runs for

vehicle number 7, 139

Figure 7-10. Truck 7, Tests 1,2, Runs 1-6. (Interior).. 140

Figure 7-11. Truck 7, Test 3, Runs 7-10. (Interior) 141

Figure 7-12. Truck 7, Test 4 (with bedding), Runs 11-14.

(Interior) . . 142

Figure 7-13. Truck 7, Test 4 (without bedding), Runs 15-18.

(Interior) 143

Figure 7-14. Truck 7, Test 5 (with bedding), Runs 19-22.

(Interior) 144

vn
Figure 10-1.

Table 10-1 .

Figure 10-2.

Figure 10-3.

Figure 10-4.

Figure 10-5.

Figure 10-6.

Figure 10-7.

Figure 10-8.

Figure 10-9.

Figure 10-10,

Table 10-2 .

Figure 10-11,

Figure 10-12,

Figure 10-13.

Figure 10-14,

Figure 11-1.

Table 11-1 .

Figure 11-2.

Figure 11-3.

Figure 11-4.

Figure 11-5.

Figure 11-6.

Figure 11-7.

Figure 11-8.

Figure 11-9.

Figure 11-10,

Table 11-2 .

Figure 11-11,

Figure 11-12,

Figure 11-13,

Figure 11-14,

Truck 10

View of test vehicle number 10 146

Maximum A-weighted sound levels as measured at the six

exterior microphone locations for all test runs for

vehicle number 10 148

Truck 10, Test 1, Runs 1,2. (Exterior) . . 149

Truck 10, Test 2, Runs 3,4. (Exterior) 150

Truck 10, Test 2, Runs 5,6. (Exterior) 151

Truck 10, Test 3, Runs 7,8. (Exterior) 152

Truck 10, Test 3, Runs 9,10. (Exterior) 153

Truck 10, Test 4, Runs 11,12. (Exterior) 154

Truck 10, Test 4, Runs 13,14. (Exterior) 155

Truck 10, Test 5, Runs 15,16. (Exterior) 156

Truck 10, Test 5, Runs 17,18. (Exterior) 157

Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test runs for

vehicle number 10 159

Truck 10, Tests 1,2, Runs 1-6. (Interior) 160

Truck 10, Test 3, Runs 7-10. (Interior) 161

Truck 10, Test 4, Runs 11-14. (Interior) 162

Truck 10, Test 5, Runs 15-18. (Interior) 163

Truck 11

View of test vehicle number 11 166

Maximum A-weighted sound levels as measured at the six

exterior microphone locations for all test runs for

vehicle number 11 168

Truck 11, Test 1, Runs 1,2. (Exterior) 169

Truck 11, Test 2, Runs 3,4. (Exterior) 170

Truck 11, Test 2, Runs 5,6. (Exterior) 171

Truck 11, Test 3, Runs 7,8. (Exterior) 172

Truck 11, Test 3, Runs 9,10. (Exterior) 173

Truck 11, Test 4, Runs 11,12. (Exterior) 174

Truck 11, Test 4, Runs 13,14. (Exterior) 175

Truck 11, Test 5, Runs 15,16. (Exterior) 176

Truck 11, Test 5, Runs 17,18. (Exterior) 177

Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test runs for

vehicle number 11 179

Truck 11, Tests 1,2, Runs 1-6. (Interior) 180

Truck 11, Test 3, Runs 7-10. (Interior) 181

Truck 11, Test 4, Runs 11-14. (Interior) 182

Truck 11, Test 5, Runs 15-18. (Interior) 183

Vlll
Figure 12-1.

Table 12-1 .

Figure 12-2.

Figure 12-3.

Figure 12-4.

Figure 12-5.

Figure 12-6.

Figure 12-7.

Figure 12-8.

Figure 12-9.

Figure 12-10.

Figure 12-11.

Table 12-2 .

Figure 12-12.

Figure 12-13.

Figure 12-14.

Figure 12-15.

View of

Maximum

exterior

vehicle

Truck 12

Truck 12

Truck 12

Truck 12

Truck 12

Truck 12

Truck 12

Truck 12

Truck 12

Truck 12

Maximum

interior

vehicle

Truck 12

Truck 12

Truck 12

Truck 12

Truck 12

test vehicle number 12 , A-weighted sound levels as measured at the six

microphone locations for all test runs for

number 12

Test

Test

Test

Test

Test

1, Runs 1,2. (Exterior) . . 1 (air), Run la. (Exterior)

2, Runs 3,4. (Exterior) . . 2

,

Runs 5,6.

3, Runs 7,8.

Test 3, Runs 9,10.

Test 4, Runs 11,12.

Test 4, Runs 13,14.

Test 5, Runs 15,16.

Test 5, Runs 17,18.

(Exterior) , (Exterior) , (Exterior) , (Exterior) , (Exterior) , (Exterior) , (Exterior) , A-weighted sound levels as measured at the two

microphone locations for all test runs for

number 12, ,

, Tests 1,2, Runs 1-6. (Interior) ,

, Test 3, Runs 7-10. (Interior). « ,

, Test 4, Runs 11-14. (Interior) ,

, Test 5, Runs 15-18. (Interior) ,

186

188

189

19,0

191

192

193

194

195

196

197

198

199

200

201

202

203

Truck 13

Figure

Table 1

Figure

Figure

Figure

Figure

Figure

Figure

Figure

Figure

Figure

Table 1

13-1.

3-1 .

13-2.

13-3.

13-4.

13-5.

13-6.

13-7.

13-8.

13-9.

13-10,

3-2 .

Figure 13-11.

Figure 13-12.

Figure 13-13.

Figure 13-14.

View of test vehicle number 13 , Maximum A-weighted sound levels as measured at the six

exterior microphone locations for all test runs for

vehicle number 13 , Truck 13, Test 1, Runs 1,2. (Exterior) , Truck 13, Test 2, Runs 3,4.

Truck 13, Test 2, Runs 5,6.

Truck 13, Test 3, Runs 7,8.

Truck 13, Test 3, Runs 9,10.

Truck 13, Test 4, Runs 11,12.

Truck 13, Test 4, Runs 13,14.

Truck 13, Test 5, Runs 15,16.

Truck 13, Test 5

(Exterior) . (Exterior) . (Exterior) . (Exterior)

.

(Exterior)

(Exterior)

(Exterior)

Runs 17,18. (Exterior)

Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test runs for

vehicle number 13 . Truck 13, Tests 1,2, Runs 1-6. (Interior)

Truck 13, Test 3, Runs 7-10. (Interior) , Truck 13, Test 4, Runs 11-14. (Interior) , Truck 13, Test 5, Runs 15-18. (Interior) ,

206

208

209

210

211

212

213

214

215

216

217

219

220

221

222

223

IX
Truck 14

Figure 14-1.

Table

'L4-1 .

Figure 14-2.

Figure 14-3.

Figure 14-4.

Figure 14-5.

Figure 14-6.

Figure 14-7.

Figure 14-8.

Figure 14-9.

Figure 14-10

Figure 14-11

Table

'L4-2 .

Figure 14-12

Figure 14-13

Figure 14-14

Figure 14-15

Figure 14-16

Figure 15-1.

Table 15-1 .

Figure 15-2.

Figure 15-3.

Figure 15-4.

Figure 15-5.

Figure 15-6.

Figure 15-7.

Figure 15-8.

Figure 15-9.

Figure 15-10.

Table 15-2 .

Figure 15-11.

Figure 15-12.

Figure 15-13.

Figure 15-14.

View of test vehicle number 14 226

Maximum A-weighted sound levels as measured at the six

exterior microphone locations for all test runs for

vehicle number 14 228

Truck 14, Test 1, Runs 1,1a. (Exterior) 229

Truck 14, Test 1, Runs 2,2a. (Exterior) 230

Truck 14, Test 2, Runs 3,4. (Exterior) 231

Truck 14, Test 2, Runs 5,6. (Exterior) 232

Truck 14, Test 3, Runs 7,8. (Exterior) 233

Truck 14, Test 3, Runs 9,10. (Exterior) 234

Truck 14, Test 4, Runs 11,12. (Exterior) 235

Truck 14, Test 4, Runs 13,14. (Exterior) 236

Truck 14, Test 5, Runs 15,16. (Exterior) 237

Truck 14, Test 5, Runs 17,18. (Exterior) 238

Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test runs for

vehicle number 14 239

Truck 14, Test 1, Runs l-2a. (Interior) 240

Truck 14, Test 2, Runs 3-6. (Interior) 241

Truck 14, Test 3, Runs 7-10. (Interior) 242

Truck 14, Test 4, Runs 11-14. (Interior) 243

Truck 14, Test 5, Runs 15-18. (Interior) 244

Truck 15

View of test vehicle number 15 246

Maximum A-weighted sound levels as measured at the six

exterior microphone locations for all test runs for

vehicle number 15 248

Truck 15, Test 1, Runs 1,2. (Exterior) 249

Truck 15, Test 2, Runs 3,4. (Exterior) 250

Truck 15, Test 2, Runs 5,6. (Exterior) 251

Truck 15, Test 3, Runs 7,8. (Exterior) 252

Truck 15, Test 3, Runs 9,10. (Exterior) 253

Truck 15, Test 4, Runs 11,12. (Exterior) 254

Truck 15, Test 4, Runs 13,14. (Exterior) 255

Truck 15, Test 5, Runs 15,16. (Exterior) 256

Truck 15, Test 5, Runs 17,18. (Exterior) 257

Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test runs for

vehicle number 15 259

Truck 15, Tests 1,2, Runs 1-6. (Interior) 260

Truck 15, Test 3, Runs 7-10.. (Interior) 261

Truck 15, Test 4, Runs 11-14. (Interior) 262

Truck 15, Test 5, Runs 15-18. (Interior) 263
Truck 16

Figure 16-1.

Table 16-1 .

Figure 16-2.

Figure 16-3.

Figure 16-4.

Figure 16-5.

Figure 16-6.

Figure 16-7.

Figure 16-8.

Figure 16-9.

Figure 16-10,

Table 16-2 .

Figure 16-11,

Figure 16-12,

Figure 16-13,

Figure 16-14,

Figure 17-1.

Table 17-1 .

Figure 17-2.

Figure 17-3.

Figure 17-4.

Figure 17-5.

Figure 17-6.

Figure 17-7.

Figure 17-8.

Figure 17-9.

Figure 17-10,

Table 17-2 .

Figure 17-11,

Figure 17-12.

Figure 17-13,

Figure 17-14,

View of test vehicle number 16 266

Maximum A-weighted sound levels as measured at the six

exterior microphone locations for all test runs for

vehicle number 16 268

Truck 16, Test 1, Runs 1,2. (Exterior) 269

Truck 16, Test 2, Runs 3,4. (Exterior) 270

Truck 16, Test 2, Runs 5,6. (Exterior) 271

Truck 16, Test 3, Runs 7,8. (Exterior) 272

Truck 16, Test 3, Runs 9,10. (Exterior) 273

Truck 16, Test 4, Runs 11,12. (Exterior) 274

Truck 16, Test 4, Runs 13,14. (Exterior) 275

Truck 16, Test 5, Runs 15,16. (Exterior) 276

Truck 16, Test 5, Runs 17,18. (Exterior) 277

Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test runs for

vehicle number 16 279

Truck 16, Tests 1,2, Runs 1-6. (Interior) 280

Truck 16, Test 3, Runs 7-10. (Interior) 281

Truck 16, Test 4, Runs 11-14. (Interior) 282

Truck 16, Test 5, Runs 15-18. (Interior) 283

Truck 17

Test Vehicle Number 17 286

Maximum A-weighted sound levels as measured at the six

exterior microphone locations for all test runs for

vehicle number 17 288

Truck 17, Test 1, Runs 1,2. (Exterior) 289

Truck 17, Test 2, Runs 3,4. (Exterior) 290

Truck 17, Test 2, Runs 5,6. (Exterior) 291

Truck 17, Test 3, Runs 7,8. (Exterior) 292

Truck 17, Test 3, Runs 9,10. (Exterior) 293

Truck 17, Test 4, Runs 11,12. (Exterior) 294

Truck, 17, Test 4, Runs 13,14. (Exterior) 295

Truck 17, Test 5, Runs 15,16. (Exterior) 296

Truck 17, Test 5, Runs 17,18. (Exterior) 297

Maximum A-weighted sound levels as measured at the two

interior microphone locations for all test runs for

vehicle number 17 299

Truck 17, Tests 1,2, Runs 1-6. (Interior) 300

Truck 17, Test 3, Runs 7-10. (Interior) 301

Truck 17, Test 4, Runs 11-14. (Interior) 302

Truck 17, Test 5, Runs 15-18. (Interior) . 303

XI
Abstract

This report presents the results of interior and exterior noise

measurements which were made on a representative sample of fifteen over- the-road trucks under various operational modes. In-cab measurements wen

made six inches from the right and left ears of the driver with windows

open and closed. Simultaneous exterior measurements were made utilizing

a six-microphone array. Graphic histories of A-weighted sound level versus

time are presented for all test conditions and microphone locations. The

National Bureau of Standards made the field measurements and tabulated the

data; however, interpretation of the results is the responsibility of the

Department of Transportation and the American Trucking Associations -- the

joint sponsors of the study. These data supplement the limited in-cab data

available in the public domain and will form part of public Docket No. MC-22

Advanced Notice of Proposed Rule Making concerning vehicle interior noise

levels which was issued by the Bureau of Motor Carrier Safety, Department of

Transportation, in response to Federal Regulations concerning occupational

noise exposure.

Key Words: Acoustics; noise measurement; noise (sound); trucks; truck

noise (exterior); truck noise (interior).

XI i
INTERIOR/EXTERIOR NOISE LEVELS OF OVER- THE -ROAD TRUCKS: REPORT OF TESTS

by

William A. Leasure, Jr., Thomas L. Quindry, Denzil E. Mathews, and James M. Heine

1. Introduction

On November 7, 1970, the Bureau of Motor Carrier Safety (BMCS)

,

Department of Transportation issued an Advanced Notice of Proposed

Rulemaking Concerning Vehicle Interior Noise Levels. The Notice was

issued ".... for the purpose of reducing the risk that drivers of

commercial motor vehicles will incur damage to their hearing or undue

fatigue because of the level of vehicle-generated noise to which they are subjected when they operate those vehicles."

The Director of the Bureau of Motor Carrier Safety invited interested

persons to submit data on sound levels in present-production, over-theroad vehicles and on sound levels in models of those vehicles projected

for future production. In addition, he invited submission of information

about hearing loss and driver fatigue as a function of exposure to noise

at various levels.

A total of forty responses was received and, according to the Deputy

Chief, Regulations Division (BMCS) , although they "did provide valuable

information for rulemaking and did reinforce the Bureau's concern that

driver hearing loss may be a result of high truck noise levels, they

provided little real data on the level and effect of in-cab noise on driver

hearing and less yet comparing improvements in interior noise levels to

decreases in exterior noise levels." Therefore, in order to develop a factual information base regarding the noise levels of typical over-theroad trucks, the National Bureau of Standards conducted a truck noise

measurement program under the joint sponsorship of the Office of Noise

Abatement, Department of Transportation and the American Trucking Association!

Inc. (DOT/ATA).

In-cab noise measurements were made at locations six inches from the

right and left ears of the driver, for fifteen representative trucks under

various operational modes with windows open and closed. To provide

information on total truck noise which affects the community, simultaneous

exterior noise measurements were made.

With the recent emphasis on environmental matters, "noise pollution"

has emerged as a major concern of several Federal Agencies with regulatory

responsibilities, including the Departments of Transportation and Labor,

and the Environmental Protection Agency, New regulations are being proposed

at state and municipal levels, with community action groups springing up all

over the county. The data presented in this report can serve as a basis for

the establishment of new standards for regulatory purposes.
2. Field Test Program

There is a definite lack of published data on the interior and

exterior noise levels produced by current trucks. In order to establish

a physical data base on the noise generated by a cross section of current

trucks, a field study was undertaken at Wallops Station (NASA), Virginia.

This also was the test site utilized by the National Bureau of Standards

for a recent Department of Transportation sponsored study to investigate

the noise generation characteristics of truck tires [lj.±/

Arrangements were made with member firms of the American Trucking

Associations to provide in-service vehicles for test purposes. Every

attempt was made to arrive at a broad representation of the population

of vehicles on the road today. Each of the fifteen vehicles was tested

according to a test procedure which included the following: (1) standard

operational procedures as defined in Society of Automotive Engineers

Recommended Practices [2,3J for the determination of maximum noise output,

(2) simulated city start-up, (3) stationary acceleration in neutral gear,

and (4) idle conditions. A discussion of the details associated with the

establishment of an appropriate and effective field test program follows.

2.1. Field Test Site

The research runway at the Wallops Station, Virginia facility of the

National Aeronautics and Space Administration was utilized as the test

site for the data acquisition phase of the program. This location provided

a flat terrain and a well-defined reflecting surface without any unusual

reflection or attenuation effects.

A 100-foot (30.48 meter) test section was established on the smooth

concrete-/ portion of the research runway. Although no lanes, such as one thinks of as being present on highways, were marked on the runway, the

concrete was laid in sections 12 feet wide and 20 feet long. For this test

program, the truck ran in one of these 12-foot lanes. Due to the deteriorated

condition of the pavement surface near the edge of the runway, the truck

ran one lane in from the edge.

A/Numbers in brackets indicate the literature references at the end of

this report.

2/ — A detailed discussion of the composition of the concrete test lane is

contained in LIJ. Basically it was a substrate of reinforced, airentrained Portland Cement concrete with a smooth finish (smoothed with

a belt of canvas composition).
2.2. Test Vehicles

Motor carriers were invited by the American Trucking Associations (ATA)

to participate in this program by donating the use of their trucks at the

Wallops Station site for test purposes.

A representative sample (selected by the ATA) of fifteen trucks was

tested. All except one -- a delivery van -- were tractor-trailer vehicles.

The sample included 13 diesel powered vehicles and 2 vehicles with gasoline

engines. Nine different makes were represented in the sample. All vehicles

tested were manufactured between 1967 and 1971 with total miles of operation

ranging from under 2,000 to over 360,000 miles (3,218-579,540 kilometers).

Section 3 of this report presents a photograph of the exterior of

each test truck along with detailed specifications.^'

2.3. Vehicle Operation Procedure

For each of the following test conditions simultaneous interior

(right and left ear positions) and exterior (array of six microphones)

measurements were made. Following SAE recommended practice, repetitive

runs were made for each test condition until the two maximum A-weighted

sound level readings, as monitored on the real time analyzer for microphone

location number 3 (see figure 1) were within 2 dB of each other. Unlike

the SAE recommended practice that requires that the average of the two

highest readings be reported, the data for all test runs made are presented in this report. For example, if three runs were made at a given test condition, data for all three runs are presented. Measurements

were made on both sides of the test vehicle with windows open and with

windows closed. Both stationary (idle and acceleration in neutral gear)

and moving (simulated city startup and SAE procedures) conditions were

specified and are outlined later in this section. The operational procedures

for tests 4 and 5 were identical to those specified by SAE Recommended

Practice C 3 J . Prior to the tests, the highest rear axle and/or transmission

gear ("highest gear" is used in the visual sense; it is synonymous with

the lowest numerical ratio) and an initial vehicle speed must be selected

so that at wide open throttle the already-moving vehicle will accelerate

from the acceleration point with the following constraints: (1) the test

section must be entered at no more than two-thirds of maximum rated or governed engine speed, and (2) maximum rated or governed engine speed must

be reached within the end zone without exceeding 35 mph (5 6.33 kilometers /hour)

before reaching the end point.

3/ —'The Department of Transportation/American Trucking Associations agreement

stipulated that the final test report would embody the results of the

program by brand name and model number, specifying the test procedure

and the noise characteristics of the individual vehicles. Although it

is not the normal policy of the National Bureau of Standards to identify

test specimens by brand names, in this case it is imperative since these

data will be submitted by DOT to the Bureau of Motor Carrier Safety as part of public Docket No„ MC-22 in support of the Proposed Rulemaking on Vehicle Interior Noise Levels which is being written to protect drivers

by reducing the risk of hearing damage or undue fatigue which is attributable

to high truck noise levels

.

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When maximum rated or governed rpm was attained before reaching the

end zone, the approach rpm was decreased in 100 rpm increments until maximum

rated or governed rpm was attained within the end zone.

When maximum rated or governed rpm was not attained until beyond the

end zone, the next lower gear was selected until maximum rated or governed

rpm was attained within the end zone.

When the lowest gear still resulted in reaching maximum rated or governed rpm beyond the permissible end zone, the vehicle was unloaded

and/or the approach rpm was increased in 100 rpm increments until the

maximum rated or governed rpm was reached within the end zone.

The test conditions were as follows:

a. Stationary Tests

For all stationary tests the truck was parked in the center of the

test lane with its exhaust outlet on a line drawn through microphones

number 3 and 6 (see figure 1)

.

Test 1. Idling noise was measured (low idle).

Test 2. (a) Noise was measured as the engine was accelerated

from low idle speed with wide open throttle in neutral

gear

(b) Noise was measured with the engine running steadily

at maximum governed rpm ("high idle")

.

b. Moving Tests

Test 3. To simulate a truck starting up in city traffic, the driver

located the front bumper of the truck on a line even with

microphone number 1 (or microphone number 5 if the truck was headed in the opposite direction) and then proceeded in a typical manner into the initial gears at wide open throttle

after each clutch engagement until traversing the entire

100 foot test section.

Test 4. Acceleration Test . The acceleration point was approached

using the engine speed and gear ratio selected according

to the above procedure and at the acceleration point wide

open throttle was rapidly established. Acceleration continued

until maximum rated or governed engine speed was reached.

Wheel slip, which affects maximum sound level, was to be

avoided.

Test 5. Deceleration test. The microphone point was approached

at maximum rated or governed engine speed in the gear selected

for the acceleration test. At the microphone point, the

throttle was closed and the vehicle was allowed to decelerate

to one-half of maximum rated or governed rpm.

-5-
2.4. Noise Measurement Systems

a. Exterior Measurements

An array of six microphones was utilized to measure exterior truck

noise. SAE Recommended Practice J366 requires a single microphone located

midway in the 100 foot length of the test section and 50 feet from the

centerline of the vehicle path. This corresponds to microphone location

number 3 (figure 1). For these tests, four additional microphones were

located along a line parallel to the vehicle path and 15 feet and 30 feet on either side of microphone number 3. These were numbered 1, 2, 4, and

5, as shown in figure 1. A sixth microphone was located 25 feet from the

centerline of the path of the vehicle directly in line with microphone

number 3

.

Photosensors, activated by a light beam produced by a spotlight

mounted on the front bumper of the truck, were located along the test

lane parallel to the path of the vehicle. The signals produced by the

photosensors provided information on truck position versus time.

Coaxial cables connected the microphones and photosensors with

the tape recording and monitoring equipment housed in the mobile

instrumentation van which was located 500 feet back from the edge of

the runway in order to comply with an airfield ruling and also to avoid

unwanted acoustical reflection effects.

For measurements of the noise produced by moving vehicles, the

driver approached the test section in the specified operational mode

for the given test. The initial photosensor, which turned on the seven- channel tape recorder, was located so that when the vehicle passed photosensoi

number 2 the tape recorder was up to speed (servo-control system in phase

lock) and data could be recorded. Data from each microphone were recorded

on one of six channels of an FM tape recorder. The truck noise (exterior) was recorded during the entire passby. The light beam striking the

photosensors caused voltage spikes which were recorded on the seventh

channel (direct record) of the tape recorder. The photosensors (photosensors

number 2, 3, 4, 5, 6, 7, and 8) were located at the acceleration point, end

point and in line with each of the microphone locations. As the truck left

the test section, a final photosensor was triggered which stopped the tape

recorder. Although the configuration shown in figure 1 corresponds to runs with the test vehicle heading northeast (right side of the truck nearest

the microphone array), test runs were also made in a southwesterly direction,

(left side of the truck nearest the microphone array). In the latter case the test layout was the mirror image of that shown in figure 1.

-6-
Figure 2 identifies the components that constituted the data

acquisition system for exterior measurements of total truck noise. To

describe the workings of the system, the following example is cited with

the contribution of each component discussed.

OPERATIONAL

ELECTRONICS

ANALOG

TAPE SYSTEM

(7 CHANNEL)

REAL TIME

ANALYZER

Figure 2. Data acquisition system for the measurement and recording

of exterior truck noise.

Consider a truck passing an array of microphones (figure 3). As the

truck moved forward, it caused pressure fluctuations which travelled as waves and activated the microphone's diaphragm into vibration. These

variations were transduced into an AC voltage which were recorded for

analysis at a later time. The microphone itself was a three-part subsystem

comprised of a microphone cartridge, protecting grid, and a microphone

preamplifier. To maintain the voltage level of the signal at the end of

the long cables carrying the signal from the microphone to the recording

facility, some line amplification was necessary. The initial amplifier/

energizer, in addition to supplying line amplification, supplied the

polarization voltage to the microphones. Once the signal reached the

tape recorder, a second amplifier (electronic voltmeter) provided signal

conditioning -- amplification or attenuation -- prior to actual recording.

The meter scale provided an indication of whether or not a tape channel

had become saturated (i.e., the signal had exceeded the dynamic range of the

recorder) and thus the data were not acceptable. The signal was then recorded

on one track of the FM tape recorder. The measurements were performed outof-doors; therefore, windscreens were placed over the microphones to minimize

the noise produced by wind passing over the microphone.

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Calibration and system checkout were performed in two steps. A

single point calibration utilizing a pistonphone which produced a 124 dB

sound pressure level (re 20 p,N/m ) at a frequency of 250 Hz was used for

system calibration in the field. The system checkout also involved running

a frequency response on the system. To perform this checkout, the

microphone cartridge was removed and replaced with an adapter which allowed

a signal generator to be coupled into the system. The sine-random generator

(signal source) was capable of producing wide band "pink noise" (white noise

passed through a network which weights at -3 dB per octave). When a display

unit, such as a real-time analyzer, was coupled to the output terminals of the

tape recorder, a flat frequency response (constant energy per octave of bandwidth) could be observed. In general, a lack of low frequency response

would be indicative of overloading of an amplifier and a lack of high

frequency response would be indicative of an amplifier failure. This

operation also established the integrity of all connecting cables. During

actual testing, the real-time analyzer was used to monitor microphone

position number 3 (figure 1) which corresponded to the location specified

in SAE J366.

b. Interior Measurements

Interior measurements were made six inches from the right and left

ears of the driver as shown in figure 4. The data from each microphone

were recorded on a two-channel, direct-record tape recorder (figure 5).

This tape recorder was not synchronized with the tape recorder in the

instrumentation van. For interior measurements a 2 kHz tone was placed

manually on the tape as the vehicle neared the acceleration point and when

it had passed the end point c Thus the exterior and interior measurements

do not have a common time base. It is felt that the instrumentation accuracy

is better than the repeatability of the experiment.

~TT It n IT

MICROPHONE'"' ry W MICROPHONE

Figure 4. The microphone locations for interior cab noise level

measurements six inches from each ear in the same horizontal plane as the driver's ear.
S XWINDSCREEN

MICROPHONE

(ZEH

PISTON PHONE

ANALOG

TAPE SYSTEM

(2 CHANNEL)

Figure 5. Data acquisition system for the measurement and recording

of interior cab noise.

2.5 Data Analysis

Once the data had been recorded, the analog tapes were returned to

the National Bureau of Standards for reduction and analysis. Figure 6

identifies the instrumentation which was utilized for analysis purposes.

Each tape was played back a channel at a time through the A-weighting

network of a measuring amplifier. A graphic level recorder was utilized

as the readout device to produce a graphic history of A-weighted sound

level versus time, corresponding to runs at each test condition. The

writing speed of the graphic level recorder was set at 100 mm/sec and

the lower limiting frequency was kept at 20 Hz which ensured stable

functioning of the writing system. According to the instrument manufacturer,

the averaging time resulting from these settings was equivalent to the

standardized meter characteristic "FAST" for sound level meters. The

paper speed, and thus the time base, was 10 mm/sec.

ANALOG

TAPE SYSTEM

A-WEIGHTING

FILTER

NETWORK

GRAPHIC

LEVEL

RECORDER

Figure 6. Data reduction and analysis system.

-10-
Photosensor signals which were recorded on one channel of the seven

channel tape recorder (utilized for exterior measurements) were used to

trigger the event marker on the graphic level recorder thus providing

truck position versus time information for all moving test conditions.

3. Test Results

The data base on the noise generated by the fifteen over-the-road

trucks tested -- both interior noise levels which affect the driver

and exterior noise levels which affect the community -- is presented in

both graphical and tabular form. Graphic level recordings of A-weighted

sound level versus time for all test runs are presented and the maximum

A-weighted sound levels for each run are tabulated.

For each truck tested there is the following information:

1. An exterior photograph of the test vehicle.

2. A data sheet providing the detailed specifications of the

vehicle including carrier, make, model, year, engine governor

setting, total miles of operation, miles since last engine

overhaul and/or exhaust work and engine make and model.

These data were provided by the carrier who loaned his truck

to the project.

Exterior Data

3. A table presenting the maximum A-weighted sound level for all

test runs.

4. The graphic level recording of A-weighted sound level versus

time for all test runs. Each page presents data for the six

microphones for two repeat runs at a given test condition.

Data for microphones 1-6 are read from top to bottom on the

page. The photosensor signals which were recorded on the

seventh channel of the FM tape recorder were used to trigger

the event marker on the graphic level recorder. For all moving

tests, above the data for microphone number 1 there appears

the seven "blips" which provided the information on truck

position versus time (see figure 1 for location of photosensors)

Interior Data

5. A table presenting the maximum A-weighted sound level for all

test runs.

6. The graphic level recordings of A-weighted sound level versus

time for all test runs. Each page presents data resulting

from measurements made six inches from the right and left ears of the driver of the vehicle.

-11-
It should be noted that although the side of the truck passing

the microphone array does not affect the interior noise levels, and

exterior noise levels are not affected by the truck windows being open or closed, this information appears in all of the tables for completeness,

One can match interior and exterior data which were recorded during the same test run by noting the test and run numbers. Complete correspondence

is not possible since the recorder utilized for interior measurements was

not synchronized with the recorder used by exterior measurements.

Rather than continue with sequential numbering of figures and tables,

it was felt that for the purpose of clarity, the figures and tables in this

section should be keyed to the particular test vehicle through the use of a double numerical designation, e.g., figure 1-1. The initial number

corresponds to the vehicle number and the second to the sequential presentation

of results for tests run on that particular vehicle.

A total of seventeen vehicles were originally scheduled for testing.

Each vehicle was assigned a number and photographed. Due to weather

conditions and scheduling problems only fifteen vehicles were actually

tested. Trucks number 8 and 9 were not tested and therefore no data

appears for these vehicles.

12-
Test Vehicle Number 1

13-
Figure 1-1. Test Vehicle Number 1,

•14-
Truck Number : 1 Carrier (owner) : United Parcel Service

Company Fleet Number: 21205

Make: Mack

Model: F-785T

Serial Number: 5495

Year: 1970

Engine Governor Setting: 2250 rpm (no load)

2100 rpm (full load)

Total Miles of Operation: 177,401

Miles Since Last Engine Overhaul: Original engine

Miles Since Any Exhaust Work: Original exhaust system

Engine : Make - Maxidyne

Model - 675-422084

15-
Exterior

Truck 01

TEST RUN SIDE (WINDOWS)

SOUND LEVEL, dB(A)

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Closed 63 65 64 64 62 70

(Stationary) 2 Left Open 62 64 64 64 62 70

2. Acceleration 3 Right Closed

(Stationary) 4 Right Closed 87 87 86 86 86 92

5 Left Open 86 88 87 88 84 91

6 Left Open 85 87 86 86 83 90

2. High Idle 3 Right Closed

(Stationary) 4 Right Closed 83 84 83 84 82 88

5 Left Open 83 83 84 84 82 89

6 Left Open 82 84 83 84 83 89

3 City Start Up 7 Right Closed 83 84 84 84 84 90

8 Right Closed 84 84 84 84 83 89

9 Left Open 86 86 84 84 83 88

10 Left Open 84 84 83 82 82 88

4. J366 11 Right Closed 86 85 84 84 83 89

(Acceleration) 12 Right Closed 83 84 83 84 83 88

13 Left Open 86 86 85 84 86 90

14 Left Open 86 85 83 84 81 89

5. J366 15 Right Closed 84 83 82 82 80 87

(Deceleration) 16 Right Closed 84 84 83 82 80 87

Without exhaust 17 Left Open 81 82 82 85 84 88

brake 18 Left Open 80 82 82 84 83 87

5. J366 19 Right Closed 84 84 83 82 81 88

(Deceleration) 20 Right Closed 84 85 84 83 82 88

With exhaust 21 Left Open 82 83 83 85 84 89

brake 22 Left Open 82 84 83 85 84 89

Table 1-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 1.

16-
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Figure 1-2. Truck 1, Test 1, Runs 1,2. (Exterior)

-17-
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70* • 1 i 1 i i i

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MICROPHONE 6

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TIME, SECONDS

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Figure 1-3. Truck 1, Test 2, Run 4. (Exterior)

-18-
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TIME, SECONDS

Figure l-4„ Truck 1, Test 2, Runs 5,6. (Exterior)

-19-
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Z^£-

'l' i r " i i ' '

i i i

MICROPHONE 5

^

I I " 1 I I —

1

2 3 4 5 6 7

i it ii i MICROPHONE 6

ii i i

i i ' i i

I 2 3 4 5 6 7

TIME, SECONDS

Figure 1-5. Truck 1, Test 3, Runs 7,8. (Exterior)

-20-
Run 10 Run 9

KX)i

09TOJ 70

UJ> 100

3O

100

90

80-

70

100

90

80

70

i i ii

MI CROPHONE 4

* i MICROPHON E 4

iii i MI CROPHONE S

i

' »' . i

'

'

' 'i 't MICROPHONES

^~*s^

^I 'I I

' " I I I I

I 2 3 4 5 6 7

- MI CROPHONE 6

TIME, SECONDS

2 3 4 5 6 7

TIME, SECONDS

Figure 1-6. Truck 1, Test 3, Runs 9,10. (Exterior)

-21-
100-

90

Run 11

V ' *u » u u >. Ml CROPHONb I

Run 12

*U U U U U L MICROPHONES

TIME, SECONDS

12 3 4 5

TIME, SECONDS

Figure 1-7, Truck 1, Test A, Runs 11,12. (Exterior)

-22-
Run 14

lOOi

90

M U U U U W

80

70

MICROPHONES

1 'i iii i M4CRO£HON^2

90

< 80i

m

_r 70

IaJ > IOOt

uj

^•^

^

3O

90

80

70

it i UrPOPHOMF A

90

^ ROPHQNE-^

Run 13

-M U U U U t MICROPHONES

70 *

i

"i i ' ' i ' 'i " 1 1 n KXH— MICROPHONE 3

i » 'i1 i MICROPHONE 2

#«=*•

ii ' i ^MICROPHONES

*»r i —

MI CROPHONE 5

»' i

MICROPHONE 4

i i i » iii

2 3 4

TIME, SECONDS

2 3

TIME, SECONDS

Figure 1-8. Truck 1, Test 4, Runs 13,14. (Exterior)

-23-
800

90

< 80

CD

_r 70

> 100

ui

90

V) 80—

70

I00i

90

80-

70

100

90-

80-

70

I

' ' 'I I " IT I MI CROPHONE 4

» i

i

i i

MICROPHONES

MICROPHONE 5

I ! I I I I MICROPHONE 5

^MCROPHONE 6

ii i i i t i i MICROPHONE 6

i iii i i

I 2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 1-9. Truck 1, Test 5 (without exhaust brake), Runs 15,16. (Exterior)

-24-
Run 18 Run 17

100

90

80

70

IOOt

9a

80-

70

KXH

"U U V V

MI CROPHONES

\r u u u u tf

MICROPHONES

MICROPHONE 2 MICROPHONF 9

MICROPHONE 3 MICROPHONE 3

TIME, SECONDS TIME, SECONDS

Figure 1-10. Truck 1, Test 5 (without exhaust brake), Runs 17,18. (Exterior)

-25-
Run 20

IOOi

9a

80-

MICROPHONE 2

70

^

90- : < 80 —

70

CD

T3

MICROPHONE 3

^s»>^^.

UJ ^

> IOOi MICROPHONE -4

Ul

_l

a

z

8CO

90

80

70

^

IOOi MICROPHONE 5

904

80

70

3: ^

MICROPHONE 2

^

MICROPHONES

1 f " i ' MICROPHONIA

» "i

—i -T 1 1

MI CROPHONE 5

—i^—— i i ' i ii

MICROPHONE 6

i i

'—i i

1 i ' > 2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 1-11. Truck 1, Test 5 (with exhaust brake), Runs 19,20. (Exterior)

-26-
Run 22

OO-i

AAirPOPHOHF 1 #V\IV.KV^r nV^INC 1 Q/V ?U

-—"^— r 80-

"4-— =ft\

7CV

Run 21

I U U U ' ' ' ' U IT*

lOOi MICROPHONE 2

MICROPHONE

i » « i i MICROPHONE 2

i i IQQt MICROPHONE 5

100

90

80

70

MICROPHONES

M4CROPHONE 5

ii i ii

_ -MICROPHON E 6

^

ii

^i i \ 12 3 4 5 6 7 12

TIME, SECONDS TIME, SECONDS

Figure 1-12. Truck 1, Test 5 (with exhaust brake), Rijns 21,22. (Exterior)

27-

Interior

Truck 01

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Closed —

(Stationary) 2 Left Open 78 77

2. Acceleration 3 Right Closed _ _ __ (Stationary) 4 Right Closed -- --

5 Left Open 92 89

6 Left Open 92 88

2 B High Idle 3 Right Closed 95 92

(Stationary) 4 Right Closed 96 93

5 Left Open 94 93

6 Left Open 96 93

3c City Start Up 7 Right Closed 96 92

8 Right Closed 95 92

9 Left Open 96 94

10 Left Open 95 92

4. J366 11 Right Closed 95 92

(Acceleration) 12 Right Closed 95 92

13 Left Open 95 94

14 Left Open 95 93

5. J366 15 Right Closed 94 94

(Deceleration) 16 Right Closed 94 92

Without exhaust 17 Left Open 94 94

brake 18 Left Open 94 94

5. J366 19 Right Closed 94 92

(Deceleration) 20 Right Closed 95 92

With exhaust 21 Left Open 95 94

brake 22 Left Open 94 94

Table 1-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 1.

•29-
90i

80-

70-

60J KDOn

90- :

< 80^

CDo

_r 7oJ > 100!

UJ

3

o

90'

80-

LEFT EAR

Run 2 RIGHT EAR

Run 2

» i i i i Run 3

Run 4

i

11 i i i Run 3

Run 4

TIME, SECONDS TIME, SECONDS

Figure 1-13. Truck 1, Tests 1,2, Runs 2-6. (Interior)

-30-
100 -i

LEFT EAR

Run 7 RIGHT EAR

Run 7

Run 8

I00i

80-

a

TO

90- ^^/^^^ .^^WVA/VVv/*

Run 8

j^vr

Run 9

i^^:

I00i

Run 10 Run 10

2 3 4 5

TIME, SECONDS

Figure 1-14. Truck 1, Test 3, Runs 7-10.

-31-

TIME, SECONDS

(Interior)
100-t

LEFT EAR

Run 11

RI6HT EAR

Run 11

Run 12 Run 12

Run 13

I00i

Run 14 Run 14

TIME, SECONDS

Figure 1-15. Truck 1, Test 4, Runs 11-14,

-32-

TIME, SECONDS

(Interior)
100-i

LEFT EAR

Run 15

RIGHT EAR

Run 15

lOOn

80- ~ 70-

2

UJ

-j

o

z

Run 16

^-w^..

Run 17

Run 16

Run 17

lOOi

Run 18 Run 18

2 3 4

TIME, SECONDS

3 4 5

TIME, SECONDS

Figure 1-16. Truck 1, Test 5 (without exhaust brake), Runs 15-18. (Interior)

-33-
100-t

LEFT EAR

Run 19

RIGHT EAR

Ruft 19

Run 20 Run 20

CDo

-J

UJ

_lo

z

3to

Run 21

~A3

Run 21

lOOi

Run 22 Run 22

^

ii i i i i 2 3 4 5 6 2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 1-17. Truck 1, Test 5 (with exhaust brake), Runs 19-22. (Interior)

34-
Test Vehicle Number 2

-35-
CDE

P

53

o

•H

QJ >

U

CO

0) Eh

i CM

013

00

•H

-36-
Truck Number : 2 Carrier (owner) : United Parcel Service

Company Fleet Number: 19960

Make: Ford

Model: P-500

Serial Number: FY 11794

Year: 1970

Engine Governor Setting: 4000 rpm (no load)

3650 rpm (full load)

Total Miles of Operation: 8,426

Miles Since Last Engine Overhaul: Original engine

Miles Since Any Exhaust Work: Original exhaust system

Engine: Make - Ford Truck

Model - P50BVH80161

37-
Exterior

Truck 02

TEST RUN SIDE (WINDOWS)

SOUND LEVEL, dE,(A)

MICROPHONES

1 2 3 4 5 6

; 1. Low Idle 1 Right Open

(Stationary) 2 Left Closed

2. Acceleration 3 Right Open

(Stationary) 4

5

6

Right

Left

Left

Open

Closed

Closed

2. High Idle 3 Right Open

(Stationary) 4

5

6

Right

Left

Left

Open

Closed

Closed

3. City Start Up 78

9

10

Right

Right

Left

Left

Open

Open

Closed

Closed

i 4. J366 11 Right Open 80 79 80 80 79 84

(Acceleration) 12 Right Open 80 79 80 79 79 84

13 Left Closed 78 76 77 76 76 81

14 Left Closed 77 76 76 76 76 81

5. J366 15 Right Open 78 78 78 79 78 83

(Deceleration) 16 Right Open 80 79 80 80 79 84

17 Left Closed 76 76 76 76 77 80

18 Left Closed 80 79 80 81 81 86

Table 2-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 2.

•38-
Run 12

WGR ONE

ii » i ii

90i MICROPHONE 2

i r MICROPHONE 2

^Sw

1 1 r i l

90i

° 80H

—iii i i MICROPHONE 4

MICROPHONE 3

i i i i i i MICROPHONE 4

9Ch

80

70

60

. i i ii

MICROPHONE 5

.^

i i i i i i

ii iii ii

MICROPHONE 5

<v^

I I II II

90-1 MICROPHONE 6 MICROPHONE 6

TIME, SECONDS TIME, SECONDS

Figure 2-2. Truck 2, Test 4, Runs 11,12. (Exterior)

-39-
Run 14 Run 13

90*

80-

LT »' " "U U—~U—-U- '" "-V| j ' " 1/ " u tr—-u

70-

60

MI CROPHONE 1 ^

i * i i

MICROPHONE 1 ^

^^V^5»^

MICROPHONE 2

i 1 i ii

MICROPHONE 2

~ 80-f <

m

° 70

T r MICROPHONE 3

zz.

S 60

t 90l

I 80

70 2

—i i i r MICROPHONE 4

MICROPHONE 3

-i 1 1 i 1 i i i MICROPHONE 4

^

60

90i

i i

.«^:

^

:s^

80

70-

60

MICROPHONE 5 —i 3 • r MICROPHONE 5

90i

80-

70

60

MICROPHONE 6

ok.

2 3 4 e TIME, SECONDS

-r-6 7

MICROPHONE 6

12 3 4 5

TIME, SECONDS

Figure 2-3. Truck 2, Test 4, Runs 13,14. (Exterior)

-40+
Run 16

90n . MICROPHONt 1 RO- ' ^ ^—i , t A,^w^V-»_ 70. ^^v» (IT

60^' 1 1 1 1 1 1 1 90

80

704

60

MICROPHONE 2

*—l^.*>u

MICROPHONE 3

QZ

3O

</>

9Ch

° 80

70

i i i r MICROPHONE 4

60

90n

80

704

MICROPHONE 5

60

90i

80

70

i i

60

MICROPHONE 6

^^

Si

3 4 £ TIME, SECONDS

T"

6

Run 15

MIlKOPflQNE 1 5S

I I I I • II

MICROPHONE 2

MICROPHONE 3

i i

MICROPHONE 4

—ii i i MICROPHONE 5

i i

7

MICROPHONE 6

I ' " "T 2 3

-i-4 5

TIME, SECONDS

Figure 2-4. Truck 2, Test 5, Runs 15,16. (Exterior)

-41-

i i

i 'i

i i

i i 6 7
Run 18

:Mt£gOPHONE 1 ^

i i ii

MICROPHONE 2

i i ^

rs

i i i iii i MICROPHONE 3

; \s"

MICROPHONE 4

g, , ^m fS^— ^

II III II

MICROPHONE 5

S

MICROPHONE 6

^^

'

i i i i i i i

I 2 3 4 5 6 7

TIME, SECONDS

Figure 2-5. Truck 2, Test 5, Run 18. (Exterior)

-42-
Interior

Truck 02

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Open

(Stationary) 2 Left Closed

2. Acceleration 3 Right Open

(Stationary) 4 Right Open

5 Left Closed

6 Left Closed

2. High Idle 3 Right Open

(Stationary) 4 Right Open

5 Left Closed

6 Left Closed

3. City Start Up 7 Right Open

8 Right Open

9 Left Closed

10 Left Closed

4. J366 11 Right Open 84 85

(Acceleration) 12 Right Open 82 83

Internal door 13 Left Closed 82 84

closed 14 Left Closed 84 82

4. J366 15 Right Open 82 84

(Acceleration) 16 Right Open 82 83

Internal door 17 Left Closed 84 84

open 18 Left Closed 83 83

5. J366 19 Right Open 85 85

(Deceleration) 20 Right Open 82 84

Internal door 21 Left Closed 87 87

closed 22 Left Closed 88 89

Table 2-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 2.

-43-
100 -»

904

80

70-

LEFT EAR

Run 11

^2

RIGHT EAR

Run 11

100

90«

80-

< 70-

m

2

Ll)

3 iooi

CO

SOTORun 12

Run 13

Run 12

Run 13

I0O

90.

80

70

Run 14

-r-4

Run 14

2 3

TIME, SECONDS

i i 5 6

i i i iii I 2 3 4 5 6

TIME, SECONDS

Figure 2-6. Truck 2, Test 4 (internal door closed), Runs 11-14. (Interior)

-44-
100-i

LEFT EAR

Run 15

90

80

70

RIGHT EAR

Run 15

<

55

2

UJ

3

I00i

90«

100-

90-

70-

Run 16

Run 17

Run 16

Run 17

I00i

90

80'^

70-

Run 18

I

Run 18

I "T1 2 3 4 5

TIME, SECONDS TIME, SECONDS

Figure 2-7. Truck 2, Test 4 (internal door open), Runs 15-18. (Interior)

-45-
LEFT EAB

Run 19

100-t

90

80

7a

^ ^a- x/^y j

RIGHT EAR

Run 19

^^

<

CD

2

UJ

-Io

z

Run 20

IOOt

90«

8p. ^~\« , fc^:

70

3 loo904

80

70-

Run 21

-^^

Run 20

Run 21

I0CH

90

80'

70

Run 22

i

f » » 2 3 4

Run 22

i * • 5 6 7 I» t i i i i 2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 2-8. Truck 2, Test 5 (Internal door closed) > Runs 19-22 (Interior).

-46-
Test Vehicle Number 3

47-
J-l

s

>

CO H

cu

j-i 60

•H

48-
Truck Number : 3

Carrier (owner) : Yellow Freight System, Inc.

Company Fleet Number: 2929

Make: Kenworth

Model: W923

Serial Number: 114213

Year: 1968

Engine Governor Setting: 2300 rpm

Total Miles of Operation: 366,493

Miles Since Last Engine Overhaul: 89,287

Miles Since Any Exhaust Work: Original exhaust system

Engine : Make - Cummins

Model - 250

-49-
Exterior

Truck 03

TEST RUN SIDE (WINDOWS)

SOUND LEVEL , dB(A)

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Closed 70 70 69 70 71 76

(Stationary) 2 Left Open 69 70 70 69 68 75

2. Acceleration 3 Right Closed 85 86 85 83 84 90

(Stationary) 4 Right Closed 85 86 86 84 84 91 ! 5 Left Open 86 86 86 84 84 92

6 Left Open 86 86 86 85 85 92

2. High Idle 3 Right Closed 85 86 84 83 83 89

(Stationary) 4 Right Closed 85 86 84 83 83 89

5 Left Open 85 85 84 83 84 89

6 Left Open 85 85 84 84 84 90

3. City Start Up 7 Right Closed 86 87 86 84 84 91

8 Right Closed 87 87 85 85 84 90

9 Left Open 86 86 86 84 85 91

10 Left Open 86 86 86 84 84 90

4. J366 11 Right Closed 87 87 87 86 86 92

(Acceleration) 12 Right Closed 86 86 86 86 86 92

13 Left Open 86 87 86 85 85 91

14 Left Open 86 86 86 86 85 92

5. J366 15 Right Closed 85 85 84 82 82 90

(Deceleration) 16 Right Closed 85 ! 85 84 83 82 89

17 Left Open 84 85 84 84 84 90

18 Left Open 84 84 85 84 83 90

Table 3-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 3.

-50-
80i

70

604

50

Run 2

MI CROPHONTT

i i • i tPHONE-2

Run 1 MICROPHONES

VV' TV* II 1 I I I ' I I MICROPHONE ?

~ 704

<

m

o 60

ID> 50' i i r — ! —

r

80t MICROPHONE 4

i i

i i ii

MICROPHONE 3

£ 70

60

50

80-,

70

60

—i

1 1 r MICROPHONE 5

i »

i ii i i MICROPHONE 4

1 1 '

j > i ' i MI CROPHONE 5

Figure 3-2,

4 5

TIME, SECONDS

Truck 3, Test 1, Runs 1,2,

-51-

(Exterior)

i »

i

i i i ii i MICROPHONE 6

i ii i i 1 2 3 4 5 6 7

TIME, SECONDS
KX)t

90

Run 3 Run 4

lOOi

-I n " —

I

1 » I lOOi MICROPHONE 3

90

< 80

m

_r 70

UJ> KX)

UJ

3OCft

90

100

»!" <>

I I I

' I' MICROPHONES

'' I '

' 'I " "» "" 9 " '

. 1 MICROPHONE 3

yrf-^nn ^

-^-i

Wg~ MICROPHONE 4

70M 1 i i ii ii

IOOt MICROPHONE 5 MICROPHONE 5

2 3 4 5

TIME, SECONDS TIME, SECONDS

Figure 3-3. Truck 3, Test 2, Runs 3,4. (Exterior)

-52-
Run 5 Run 6

KX)

m

UJ> 100

UJ

3O

CO

90

80

70

90

80-

70

100*

i i ii

MICROPHONE A

' i i " " i

• ' ' 'i 'i

MICROPHONE 4

-i 1 1 » — i 1 1 MICROPHONE 5

» r

MICROPHONE 5

i i MICROPHONE 6i t t i i t § MICROPHONE 6

TIME, SECONDS

i ' i » i i » 12 3 4 5

TIME, SECONDS

-i7

Figure 3-4. Truck 3, Test 2, Runs 5,6. (Exterior)

-53-
90

Run 8

80

MICROPHONE 1

I0O, MICROPHONE 2

Run 7 J—

u u u u —yj. .... ^ AjU^D^DU/"MvIC 1 /VM^KvJrMvJNt 1

.«f-* " ^^S-^ _^^-^ "^-^.^.n*. v^1^ v. y

^ Mm ^ ^V- i^

1 I

1 1 —"I MICROPHONE 2

90-

80

70j r 100

90

804

70

MICROPHONE 6 MICROPHONE 6

2 3 4 5 6 7

TIME, SECONDS

Figure 3-5. Truck 3, Test 3, Runs 7,8. (Exterior)

-54-

TIME, SECONDS
KXH

90

70

I00i

90

80-

70

KXh

90

< 80

J 70

£ KX)i

i 90

3

W

80

70

lOOi

90

804

lOOi

Run 10

-u u u u u i MI CROPHOKf t

MICROPHONE 2

MICROPHONE 3

MICROPHONE 4

^

—i ii i-r MICROPHONE 5

T » ^^

70J , _ I " I I

• i MICROPHONE 6

Run 9

MICROPHONE 1

y""'*"'taV«- -J""-* —->~ \»^^ ^"<v^ >^

J" '~^* af /**"^

"

' " • AAirPOPHOKJF 9

i

V»* i^r "S^^^Vv /^^^'v^so^v^

jp^ N*\ Z

1*^ ^If ^**v f&*& \

-i MICROPHONE 3

,r-^ " >-~^

s^^— "^^-v/^- " <^^S

i MICROPHONE 4

,*•— -'— ^-^^ /^—^-~*w_^S^ '

• ^jf ^

MICROPHONE 5

— ^^^^^ ^J "S. w*± —^c "

»_|-i * ^^ '" ^"

.._ MICROPHONE 6

/^""-^^-^-s

^' ^**

f

2 3 4 5 6

TIME, SECONDS

Figure 3-6. Truck 3, Test 3, Runs 9,10. (Exterior)

-55-

TIME, SECONDS
lOO-i

90

BO

70

lOOt

90

80-

70

KKH

100

90

70

I00i

Run 12

j^-— y.-y... -1/—

\J- Run 11

-U" U U \J~—U ' L MirpnPHON F i MI CROPHONE 1

MICROPHONE 2

i ?

'

' • •

MICROPHONE 2

MICROPHONE 3

ii

MICROPHONE 5

T ' i " . i —r———

MICROPHONE 6

i i MICROPHONE 5

ii i i i MICROPHONE 6

TIME, SECONDS

Figure 3-7. Truck 3, Test 4, Runs 11,12,

-56-

TIME, SECONDS

(Exterior)

• i

i

1 ii - i

1 t'l'i "

i MICROPHONE 3
IOO-i

Run 14

J

" ' v \i wmm v——u t

90

BOJO

lOOi

KXh

<

to

Ul>

UJ

_Jo

z

O

(O

70

100

90

80

70

lOOi

100

Run 13

~U U U U LT* MICROPHOHE 1 MI CROPHONE

MICROPHONE 2 MICROPHONE 2

i i i i i MICROPHONE 4

i

1 i r i

1

' . MICROPHONE 5

MICROPHONE 4

i • i 1 • MICROPHONE 5

MICROPHONE 6

TIME, SECONDS

12 3 4 5

TIME, SECONDS

6 7

Figure 3-8. Truck 3, Test 4, Runs 13,14. (Exterior)

-57-
Run 16

'i KKh

90

< 80

m

"O_r 70

too

MICROPHONE 3 MICROPHONE 3

>

UJ

_i

o

z

oCO

90

70

100

90

MICROPHONE 4

80^=

80-

i ii

MICROPHONE 5

i <i

MICROPHONE 4

MICROPHONE 5

100

2 3 4

TIME, SECONDS

Figure 3-9. Truck 3, Test 5, Runs 15,16.

-58-

12 3 4 5

TIME, SECONDS

(Exterior)
KX)-£

90

eo^r

Run 18

-u—u—\j——\J~~vr—"1. Run 17

u tr—\j-~u—\r—u i MICROPHONE 1

70*

lOOi

90

80-

70

KXH

90-

< 80

oo•o_r 70

UJ> KX)

UJ

OCO

90

80

70

lOOn

90

80

70

100

90

80

70

MI CROPHONE 1

MICROPHONE 2 MICROPHONE 2

MICROPHONE 3 MICROPHONE 3

~~&

MICROPHONE 4

i i

i i " > i 'i 1

1

i MICROPHONE 4

—

i

1 »ii %

* i ' ' i

• * MICROPHONE 5 -. MICROPHONE 5

i i' i i i

1 i MICROPHONE 6 — .MICROPHONE 6

12 3 4 5

TIME, SECONDS

7 3 4 5

TIME, SECONDS

Figure 3-10. Truck 3, Test 5, Runs 17,18„ (Exterior)

-59-

Interior

Truck 03

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Closed 79 80

(Stationary) 2 Left Open 79 79

2. Acceleration 3 Right Closed 94

(Stationary) 4 Right Closed 91 90

5 Left Open -- --

6 Left Open -- --

2. High Idle 3 Right Closed 94 90

(Stationary) 4 Right Closed 94 90

5 Left Open 92 92

6 Left Open 92 92

3. City Start Up 7 Right Closed 92 90

8 Right Closed 92 90

9 Left Open 93 92

10 Left Open 94 92

4. J366 11 Right Closed 90 91

(Acceleration) 12 Right Closed 91 91

13 Left Open 94 92

14 Left Open 96 93

5. J366 15 Right Closed 93 90

(Deceleration) 16 Right Closed 92 90

17 Left Open 92 91

18 Left Open 91 91

Table 3-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 3.

61-
LEFT EAR

Run 1 RIGHT EAR

Run 1 90

80

704

60

90

i i

' i' i i i Run 2

i" i rRun 2

80

70-

60

KXh ——i i Run 3

90.B

< 80

m

o

_r 70

UJ> 100

UJ

_j

i 90

8

80

»*-»-«» v>r'

I i I ' I I l Run 4

T —l 1 1 ' i 1-

I Run 3

70' 100

^

i' ' t ' i i i i Run 5

ii i i i Run 4

^^w&^^s*

9Q.£rs

80-

» i Run 5

IOOt

TIME, SECONDS TIME, SECONDS

Figure 3-11. Truck 3, Tests 1,2, Runs 1-6. (Interior)

-62-
LEFT EAR

Run 7 RIGHT EAR

Run 7

IOOt

90-

80-

5

^ CD

Run 8

S ^^ ^

Run 8

UJo

z

3 loo-r

CO

90'

804

7a

Run 9

•-* ^

Run 9

100

Run 10 Run 10

TIME, SECONDS TIME, SECONDS

Figure 3-12. Truck 3, Test 3, Runs 7-10. (Interior)

-63-
100-

90

80<

70-

LEFT EAR

Run 11

i>x" *~* ^^_<r

RIGHT EAR

Run 11

<

o

2

UJ

-ia

z

8

100'

90

80 ~ 70

Run 12

I00<

90«

80

70-

Run 13

Run 12

Run 13

IOO-i

90

80'

70

Run 14

=s:

-T-4 6

TIME, SECON0S

Run 14

12 3 4 5

TIME, SECONDS

6 7

Figure 3-13. Truck 3, Test 4, Runs 11-14. (Interior)

-64-
IOO-i

80

70-

LEFT EAR

Run 15

RIGHT EAR

Hun 15

<

55

2

UJ

-I6

z

8

100-

90

80 ~ 70-

Run 16

^-> *^\„

I00<

90-

80

70«

Run 17

Run 16

Run 17

I0O

90

80'

70

Run 18

I 2 3 4 5 TIME, SECONDS

Run 18

I 4

Figure 3-14. Truck 3, Test 5, Runs 15-18.

-65-

TIME, SECONDS

(Interior)

Test Vehicle Number 4

-67-
E

4=

QJ >

CD

QJO

00

•Hfa

-68-
Truck Number: 4

Carrier (owner): Hall's Motor Transit

Company Fleet Number: 1667

Make: International

Model: F2000DYT

Serial Number: 256961

Year: 1967

Engine Governor Setting: 2100 rpm

Total Miles of Operation: 340,023

Miles Since Last Engine Overhaul: 65,156

Miles Since Any Exhaust Work: 19,094

Engine: Make - Cummins

Model - NH250

69-
Exterior

Truck 04

TEST RUN SIDE (WINDOWS)

SOUND LEVEL, dB(A)

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Open 64 64 64 65 64 70

(Stationary) 2 Left Closed 68 68 67 68 66 74

2. Acceleration 3 Right Open 85 84 84 84 84 90

(Stationary) 4 Right Open 84 84 84 84 83 90

5 Left Closed 84 83 82 83 82 88

6 Left Closed 85 84 84 84 83 90

2. High Idle 3 Right Open 85 86 84 84 84 90

(Stationary) 4 Right Open 85 86 85 84 84 90

5 Left Closed 83 82 81 82 82 88

6 Left Closed 83 82 82 83 82 88

3. City Start Up 7 Right Open 90 89 88 88 86 95

8 Right Open 90 89 87 88 86 94

9 Left Closed 87 86 85 86 86 91

10 Left Closed 87 86 85 86 86 91

4. J366 11 Right Open 90 89 88 89 86 94

(Acceleration) 12 Right Open 90 89 88 88 86 94

13 Left Closed 87 86 85 86 86 90

14 Left Closed 87 86 85 86 86 90

5. J366 15 Right Open 89 86 86 86 85 92

(Deceleration) 16 Right Open 89 86 85 85 86 92

17 Left Closed 84 84 85 86 86 89

18 Left Closed 85 85 85 86 86 90

Table 4-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 4.

-70-
80

70

604

Run 2 MI CROPHONES

70-

t*fi*^*jB&Z%m 60

«/**>/w

O

z

I TO

80-, MICROPHONE 4

60

50 'ill

80t MICROPHONE 5

704

60 ^yvy^^^"^*^^*'^^^^^

50 I 80t MICROPHONE 6

70-

60

50 "T-3

TIME, SECONDS

-T-6

Run 1

50-* 1 i 1 t i 80i MICROPHONE 2

MI CROPHOttF-h

80-

70-

60-

50-

| MICROPHONE 3

—-» <x i "ii <i *~m w«wi» ^^». -. .„ ..f-i ^iwtn

Hio

.1 lu>

III

1 1 1

1

1 1 1—- 1

-1— 1 1 II— I I MICROPHONE 2

i ' i i 1 1 i i MICROPHONE 3

• " ii i ii i MICROPHONE 4

' " .^•w ii ii. m » r,- , , „, rf ,| ii ,

I I I I ' I ' I I I MICROPHONE .5

^yp*m**m+mj*m&m*^ —*&*^*^*^^0m&*^^am&**if*B0**

i

' i MICROPHONE 6

t r- r 1 1 i 2 3 4 5 6 7

TIME, SECONDS

Figure 4-2, Truck 4, Test 1, Runs 1,2,

-71-

(Exterior)
100

90

80-

70

I0CK

I0O

90

< 80-J

m

o

_r 70

UJ> 100

3

13O

CO

90

Run 3

MI CROPHONE 1

Run 4

MI CROPHONIA

MI CROPHONE 2 MICROPHONF ?

MI CROPHONE 3

i i

1 i h i MI CROPHONE 4

MICROPHONE 3

7(>u , , , , , IOOt MI CROPHONE 5 MI CROPHONE 5

TIME, SECONDS TIME, SECONDS

l

i ' ii r ii i MI CROPHONE 4

Figure 4-3. Truck 4, Test 2, Runs 3,4. (Exterior)

-72-
KX)

90

80

Run 5 MICROPHONIA

70

IOOt M4CROPMONE 2

Run 6

mooPHOfrm

90

90

u

> 100

ui

3O

90

80

70

100

90

IOOt

90

80

70

KXh MICROPHONE 3

MICROPHONF ?

i i i i n ii

MI CROPHONE 4

MICRQRHQNJL3

T 1 I I I >

MI CROPHONE 4

MI CROPHONE 5

-i——i——» ' t MICROPHONE 6

i » iii i i -MICROPHONE 5

ii i iii i i MICROPHONE 6

I 2 3 4 5 6

TIME, SECONDS

V I I I I I 2 3 4 5 6 7

TIME, SECONDS

Figure 4-4. Truck 4, Test 2, Runs 5,6. (Exterior)

-73-
Run 7

"M U ' tf~*~—Xf

MICROPHONE 1 2

z^tk:^

MICROPHONE 2

3O

90

80

70

I00i

• ii i MICROPHONE 4

MICROPHONE 3

,^^^

'I 'I I I ' ! I 'I '|

MICROPHONE 4

^V^

i i MICROPHONES

i < MICROPHONE 5

TIME, SECONDS

2 3 4 5

TIME, SECONDS

6 7

Figure 4-5. Truck 4, Test 3, Runs 7,8. (Exterior)

-74-
100

90

Run 9

80-

70

MI CROPHONE

^—^-^^^

IQOi MICROPHONE 2

on. J7LT

—

l

X'

r ~^r,^^w. -^^ ^

h"V 80- ^-^r* ^w^

S^

7QJ

KXh MICROPHONE 3

o

90

80^

7Q

MICROPHONE 5

Run 1.0 MICROPHONE 1

-;

- ~--y -~ •"

,

**»v -ar*^^ ^ ^W"N

7^

-. MICROPHONE 2

1 1

-^"^w^-

yr^- sS»*w_

. —^f*r ^<^r l"^^\

7^—

-. MICROPHONE 3

r*"'

'""r"_V /* ~* "K

. —-p* ^*«/ — *~NT

jf

f

•j MICROPHONE 4

i

' , ,„ —

,

^^^^

^-w/" ^

VV*N-v

- -^- -^- ^*\

/

-. MICROPHONE 5

/ ' " ^' -*-a=^r

, MICROPHONE 6

J>

^

=N-%— S ^-^ ^> vN_

- jy^ a\

r

TIME, SECONDS

2 3 4 5

TIME, SECONDS

6 7

Figure 4-6. Truck 4, Test 3, Runs 9,10. (Exterior)

-75-
KX)

CD

_r

UJ>

UJ

3O

90

80

70

100

90

80

70

iii i MICROPHONE 4

«£:

i i i» i i MICROPHONE 5

MICROPHONE 4

i j i —' i • 1 MICROPHONE 5

TIME, SECONDS

12 3 4 5

TIME, SECONDS

Figure 4-7. Truck 4, Test 4, Runs 11,12, (Exterior)

-76-
Run 13 Run 14

•u \j u

" u U u

UJ> 100

y

§ 90

O

W

80

70

100

90

80

i

1 i

1

' i

"

' i " i

" ' ' i i" i MICROPHONE 4

i i— iii t MICROPHONE 5

MICROPHONE 4

704 r

100

i ii i i MICROPHONE 5

—r —i i i i ' i " | ' I • • • • MICROPHONE 6 - MICROPHONE 6

TIME, SECONDS

12 3 4 5

TIME, SECONDS

i

7

Figure 4-8. Truck 4, Test 4, Runs 13,14. (Exterior)

-77-
Run 15

lOOi

9a

80-

70

OOi

90

< 80

Ho

"O_r 70

UJ> 100

3OCO

90

80-

70

100

90

80

I00i

90

804

70

MICROPHONE 2 MICROPHONE 2

^y^^r^J'- S

MICROPHONE 3

MICROPHONE 4

*cp—

~4-

70-1 1 f

MICROPHONE 6

^

=*

-T- 4

T5

TIME, SECONDS

-r-6

MICROPHONE 3

-»—i—i i ' i ' i i i MICROPHONE 5

MICROPHONE 4

» »—'—i

MICROPHONE 5

2^

i ii i i —-MICROPHONE 6

7 12 3 4 5

TIME, SECONDS

Figure 4-9. Truck 4, Test 5, Runs 15,16. (Exterior)

-78-
Run 18

j— —%i u u u v MICROPHON E 1

Run 17

ICOr

90

80-

I00i

90+

80

100

90

80

70

MICROPHONE 2

70* i » i i

lOOi MICROPHONE 3

MICROPHONE 2

MICROPHONE 3

MICROPHONE 5

70-1 1 r -r i I » '

i I MICROPHONE 6

• • MICROPHONE 5

^

5

i i

ii i i i i t MICROPHONE 6

TIME, SECONDS

3 4 5

TIME, SECONDS

Figure 4-10. Truck 4, Test 5, Runs 17,18. (Exterior)

-79-

Interior

Truck 04

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Open 75 77

(Stationary) 2 Left Closed 78 77

2. Acceleration 3 Right Open _ _ _ _ (Stationary) 4 Right Open 93 94

5 Left Closed -- --

6 Left Closed 93 91

2. High Idle 3 Right Open 93 92

(Stationary) 4 Right Open 93 94

5 Left Closed 92 90

6 Left Closed 92 92

3. City Start Up 7 Right Open 95 95

8 Right Open 95 95

9 Left Closed 95 95

10 Left Closed 95 95

4. J366 11 Right Open 96 95

(Acceleration) 12 Right Open 96 94

13 Left Closed 96 94

14 Left Closed 96 94

5. J366 15 Right Open 94 94

(Deceleration) 16 Right Open 93 94

17 Left Closed 96 94

18 Left Closed 95 93

Table 4-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 4.

81-
90t

80

704

60

90i

80

70-

100-r

90

80

90

80-

70

LEFT EAR

Run 1 RIGHT EAR

Run 1

i i i i ' i' I Run 2 Run 2

60 ' r 100

R^n———

i

* » "RurTT

-, ,

Run 5 "Run 5

70J 1 » * »——i »

1 I00i- Run 6

I I I I I Run 6 ^\J^/,*'N M n'^ —^»»' W ^»^^^ , u M i»

I ' ' I | I ' I | 2 3 4 5 6 7 I 2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 4-11. Truck 4, Tests 1*2, Runs 1-6. (Interior)

82-
OOn

LEFT EAR

Run 7 RIGHT EAR

Run 7

*-*\ t~tT*~\ *f^-m -TM^1 -rw_-

"***"' v#* / \. jT "^-S-^ S**^ ""*^*\ /""W""'' \ ^* »U* '/~^^

-/ v/ ' s jT * WJ* *

UJo

V) IOCH

90" ^

80-

70-

Run 8

Run 9 ^,^

Run 8

Run 9

lOOr

90

80

70

Run 10

I 2 3 4 5 6 7

TIME, SECONDS

Figure 4-12. Truck 4, Test 3, Runs 7-10.

-83-

Run 10

12 3 4 5

TIME, SECONDS

(Interior)
100-i

LEFT EAR

Run 11

90

804

70

^r=*-

RIGHT EAR

Run 11

IOOt

90

80

< 70

35

2

8 loo-

(A

804

70

Run 12

Run 13

Run 12

Run 13

I00n

90

80

70

Run 14

I

Run 14

2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 4-13. Truck 4, Test 4, Runs 11-14. (Interior)

84-
100 -i

90-

80-

70

LEFT EAR

Run 15

RIGHT EAR

Run 15

100-r

90-

80- ~ 70-

Run 16 Run 16

UJ

_ia

8 1007

90-

80-

70-

Run 17 Run 17

lOOr

90

80«

70-*

Run 18

TIME, SECONDS

Figure 4-14. Truck 4, Test 5, Runs 15-18.

Run 18

4

i i 6 7

TIME, SECONDS

(Interior)

85-

Test Vehicle Number 5

87-
uB3

S3>

4-1 CO

<L) Hi

<u

too

•r-l

88-
Truck Number : 5 Carrier (owner): Burlington Industries, Inc.

Company Fleet Number: 2401

Make: Mack

Model: FS761LT

Serial Number:

Year: 1971

Engine Governor Setting: 2600 rpm

Total Miles of Operation: 121,300

Miles Since Last Engine Overhaul: Original engine

Miles Since Any Exhaust Work: 29,850

Engine : Make - Cummins

Model - V903

-89-
Exterior

Truck °5

TEST RUN SIDE (WINDOWS)

SOUNI) LEVEL, dB(A)

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Open 64 63 61 63 62 68

(Stationary) 2 Left Closed 63 62 62 62 64 69

2. Acceleration 3 Right Open 92 89 88 87 86 94

(Stationary) 4 Right Open 92 90 88 86 86 93

5 Left Closed 86 88 86 87 88 92

6 Left Closed 85 87 85 86 89 90

2. High Idle 3 Right Open 92 90 87 83 86 93

(Stationary) 4 Right Open 92 90 87 83 86 92

5 Left Closed 86 88 85 86 89 90

6 Left Closed 85 87 85 86 89 90

3. City Start Up 7 Right Open 89 89 90 89 87 94

8 Right Open 90 88 89 89 88 94

9 Left Closed 88 86 88 89 88 94

10 Left Closed 88 88 88 87 88 93

4. J366 11 Right Open 90 89 90 90 91 95

(Acceleration) 12 Right Open 89 88 88 90 88 94

13 Left Closed 88 88 88 89 89 93

14 Left Closed 88 88 88 89 89 93

5. J366 15 Right Open 90 88 87 87 85 92

(Deceleration) 16 Right Open 90 88 88 87 86 93

17 Left Closed 84 85 86 88 88 91

18 Left Closed 84 84 87 88 88 91

Table 5-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 5.

-90-
80n

70

60

Run 2 7AICROPHOM€-+

50 ' i 1 i i 1 1 8O1 MICROPHONE 2

Run 1 MI CROPHOfff-F

70-

60

50

80 ^ 70

<

m

60

t 1 1 1 r

MICROPHONE 3

i i i ii i i MICROPHONE 2

^•fl*^^"^^ M^b^^

^^ mw^%g^f^ma^^^t^9m<^^gt^^

111 w 50^

1 70^

i i i i i MICROPHONE 3

60

MICROPHONE 4

50

80,

•ft r

MICROPHONE 4

70-

60

50

MICROPHONE 5 MICROPHONE 5

80i

70

60

50

MICROPHONE 6

l<S^ M, oM^)^

I

I I I

I I I 2 3 4 5 6 7

T 1 I 1 I MICROPHONE 6

-i 1 1

1 i 1 2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 5-2„ Truck 5, Test 1, Runs 1,2. (Exterior)

-91-
§ 90

O

W

80

70

100

Run 4

i i KXh MICROPHONE 3 MICROPHONE 3

—i i i ' f

' i 'i

MICROPHONE 5 MICROPHONE 5

i it

TIME, SECONDS TIME, SECONDS

Figure 5-3. Truck 5, Test 2, Runs 3,4. (Exterior)

-92-
Run 6 Run 5 lOOi

lOOi

lOOn

90-

< 80

m

_r 70

Ul> lOOi

ItJ

3O

90

80

70

lOOi

90

80

70

MICROPHONE 3

•—' i i i i MICROPHONE 4

I 2 3 4 5 6

TIME, SECONDS

-, MICROPHONE 3

, >*%_ —-J- jf

t/

• l i I |l

MICROPHONE 5

MICROPHONE 4

• i • ' i MICROPHONE 6

MICROPHONE 5

< \

—

y ' > , i i 'i i > MICROPHONE 6

I 2 3 4 5 6 7

TIME, SECONDS

Figure 5-4. Truck 5, Test 2, Runs 5,6. (Exterior)

-93-
Run 7

-u -—

u u \f

""* ~^-

l ' i 1 I I '

' i '

' I MICROPHONE 4

« i i i

' '

' i MICROPHONE 4

70

100

-i 1—i——i i ' i i . MICROPHONE 5

i i i i ill

MICROPHONE 5

TIME, SECONDS

3 4 5

TIME, SECONDS

Figure 5-5. Truck 5, Test 3, Runs 7,8. (Exterior)

-94-
KX)i

Run 10

J

"" u if \I "" VI \j MICROPHONE 1

¥^—- SsK^L.

-i——I 1 lOOi MICROPHONE 2 MICROPHONE 2

TIME, SECONDS TIME, SECONDS

Figure 5-6. Truck 5, Test 3, Runs 9,10. (Exterior)

-95-
Run 12

IfiO u

' wr—v—u—-u~-u l

90

80

70

lOOi

90

80-

70

KX)i

90

<

ui

>

y

o

z

3

o

<0

80

70

100

80-

70*

lOOi

Run 11

J V^' ""V/"""V' ' "\JTM""W^^

>NE 1 MICROPHONE 1

MICROPHONE 2

MICROPHONE 3

MICROPHONE 2

i i t i i MICROPHONE 4

i

1 ' 'i '

i i i' n » n i i MICROPHONE 3

MICROPHONE 5

* " i

1 'i '

MICROPHONE 4

i

ii i i MICROPHONE 5

i i ' i i i

100

90

80-

70

MICROPHONE 6

I

' I I I " H i I ' n MICROPHONE 6

-T-4

-r-5

-r-6 7

TIME, SECONDS

2 3 4 5

TIME, SECONDS

6 7

Figure 5-7. Truck 5, Test 4, Runs 11,12,

-96-

(Exterior)
Run 13

J u u u~—vr-~u " l MICROPHONE 1

Run 14

j i/ u tr—\j—\j v. MI CROPHON E 1

70' i

»—' i i i

'

" i ' i KX>, MICROPHONE 3

o

>

Z3O

70

100

90

80

90-

80

70

100

90

804

70

MICROPHONE 3

MICROPHONE 4

70* i 1 i iii i I00i MICROPHONE 5

MICROPHONE 4

MICROPHONE 5

MICROPHONE 6 MICROPHONE 6

^

T

s

^

2 3 4 5

TIME, SECONDS

6 7 12 3 4 5

TIME, SECONDS

i i 6 7

Figure 5-8 Truck 5, Test 4, Runs 13,14. (Exterior)

-97-
Run 15 Run 16

m

UJ>

o

z

g

90

80

MICROPHONE 4

70

lOOi

90

i i f

> i MICROPHONE 5

MICROPHONE 4

^^

MICROPHONE 5

70

lOOi

i ii i MICROPHONE 6

ii i i i 'i % MICROPHONE 6

TIME, SECONDS

2 3 4 5

TIME, SECONDS

Figure 5-9. Truck 5, Test 5, Runs 15^.16. (Exterior)

-98-
Run 17

j

- ~ "\rv*w-u V MI CROPHONE 1

IOOi

90-

80

MICROPHONE 2

70

KKh

MICROPHONE 2

^•^—\S±-

MICROPHONE 3 MICROPHONE 3

00

>

3

QZ

O

Vi

90

80

70

MICROPHONE 4

100

90

80

—i i ii

MICROPHONE 5

MICROPHONE 4

MICROPHONE 5

701 100

90

80

70

i i i ii

MICROPHONE 6

2 3 4 5

TIME, SECONDS

i i

'I ' I ' I I " ' H I I ' '> MICROPHONE 6

i 12 3 4 5

TIME, SECONDS

i

7

Figure 5-10. Truck 5, Test 5, Runs 17,18. (Exterior)

-99-

Interior

Truck 05

TEST ! RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Open 67 67

(Stationary) 2 Left Closed 70 69

2. Acceleration 3 Right Open 96 90

(Stationary) 4 Right Open -- --

5 Left Closed 96 88

6 Left Closed 96 89

2. High Idle 3 Right Open 96 90

(Stationary) 4 Right Open 97 90

5 Left Closed 96 90

6 Left Closed 97 90

3. City Start Up 7 Right Open 96 92

8 Right Open 95 91

9 Left Closed 96 91

10 Left Closed 96 90

4. J366 11 Right Open 96 91

(Acceleration) 12 Right Open 96 91

With bedding 13 Left Closed 95 90

14 Left Closed 96 90

4. J366 15 Right Open 99 93

(Acceleration) 16 Right Open 98 92

Without bedding 17 Left Closed 98 93

18 Left Closed 98 93

5. J366 19 Right Open 97 90

(Deceleration) 20 Right Open 97 90

With bedding 21 Left Closed 95 89

22 Left Closed 95 90

Table 5-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 5.

101-
90t

80-

70-

90i

80-

60J lOOn

90-

UJ> lOOi

iti §

O" »1

7CH

lOOi

90<

80"

lOOi

90--

80-

70-

LEFT EAR

Run 1

60J 1 1 Run 2 T 1 1

'I I I ' I I Run 3

-=» o-

< 80- /'

_T 70 ' -r Run 4

i i

_ — i -*| ~~^^^*"fcJ*

L. ^-

w ' .: i t—i—

Run 5

r i i Run 6

J^V/Wti n_ 4i i —

"AA^-

II I I 2 3 4 5

TIME, SECONDS

RIGHT EAR

Run 1

-wrf*^fc r-J*»»B<

Run 2

• Run 4

Run 5

I

T— 1 I I | Run 3

Run 6

i i »

3 4 5

TIME, SECONDS

Figure 5-11. Truck 5, Tests 1,2, Runs 1-6. (Interior)

102-
LEFT EAR

Run 7 m

RIGHT EAR

Run 7

\T^ ' n -fty

-J

UJ

Run 8 Run 8

Run 9

UAN^-^g

Run 9 ^^W^

lOOt

Run 10

^

12 3 4 5

TIME, SECONDS

Figure 5-12. Truck 5, Test 3, Runs 7-10,

Run 10

"W^y/^ '^

4

TIME, SECONDS

(Interior)

-103-
100-i

LEFT EAR

Run 11

90

80

70-

^S^

RIGHT EAR

Run 11

-r?

Run 12

100-

90

80«

5 *>

2

UJ

Run 13

Run 12

^££

Run 13

^^ ^

lOCh

90

801

70

Run 14

^*/-'

T" 3 ~4 T

TIME, SECONDS

Run 14

I 4

TIME, SECONDS

Figure 5-13. Truck 5, Test 4 (with bedding), Runs 11-14. (Interior)

-104-
100 -i

LEFT EAR

Run 15

RIGHT EAR

Run 15

CD

2

3

100

90-

80- ~ 70-

100-T

Run 16

Run 17

Run 16

Run 17

I0O

90

80

70

Run 18

W~*~S

2 3 4

TIME, SECONDS

Run 18

3 4 5

TIME, SECONDS

Figure 5-14. Truck 5, Test 4 (without bedding), Runs 15-18. (Interior)

-105-
100-

LEFT EAR

Run 19

^;

90«

80-

70-

RIGHT EAR

Run 19

<

o

o

2

Ul

3

100-1

100-

Run 20

Run 21

S

90-

*V—

80-

70-

Run 20

Run 21

IOOt

90.

80t

70-

Run 22

5

> » i i 2 3 4 5

TIME, SECONDS

Run 22

i i i i i 2 3 4 5 6

TIME, SECONDS

Figure 5-15, Truck 5, Test 5 (with bedding), Runs 19-22 (Interior).

-106-
Test Vehicle Number 6

•107-
u

QJ X>E

4=

CD >

4-1 CO

cu

i

CD3

00

•H

-108-
Truck Number : 6 Carrier (owner): Associated Transport, Inc.

Company Fleet Number: 7785

Make : Ford

Model: LN9000

Serial Number: R90JVL10339

Year: 1971

Engine Governor Setting: 2200 rpm

Total Miles of Operation: 54,600

Miles Since Last Engine Overhaul: Original engine

Miles Since Any Exhaust Work: Original exhaust system

Engine : Make - Cummins

Model - NHC 250

-109-
Exterior

Truck 06

TEST RUN SIDE (WINDOWS)

SOUND LEVEL, dB(A)

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Open 65 65 66 66 64 72

(Stationary) 2 Left Closed 66 66 66 66 65 72

2. Acceleration 3 Right Open 86 86 86 86 84 92

(Stationary) 4 Right Open 86 86 86 86 84 92

5 Left Closed 85 86 86 86 85 91

6 Left Closed 84 85 85 86 85 91

2. High Idle 3 Right Open 85 86 86 86 85 91

(Stationary) 4 Right Open 85 86 86 86 85 91

5 Left Closed 84 84 84 85 84 90

6 Left Closed 84 84 84 85 84 90

3. City Start Up 7 Right Open 86 87 86 87 86 92

8 Right Open 86 87 86 87 86 92

9 Left Closed 86 86 85 87 86 92

10 Left Closed 86 86 85 86 85 91

4. J366 11 Right Open 87 86 86 86 84 91

(Acceleration) 12 Right Open 86 87 85 86 86 91

13 Left Closed 85 86 85 86 86 91

14 Left Closed 85 86 86 86 85 91

5. J366 15 Right Open 85 85 86 85 84 90

(Deceleration) 16 Right Open 85 85 84 84 83 90

17 Left Closed 82 84 84 85 84 89

18 Left Closed 83 84 84 85 84 89

Table 6-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 6.

110-
80i

70

60

Run 2 MICROPHONES

80i MICROPHONE 2

1

70-

OV/ fin

5oJ —i

i 1—

i

80t MICROPHONE 3 ~ 704

<

m

"°_ 604

u 5b ~ 80i

8 TO

60

50-

80

-1 r* 1 I i i MICROPHONE 4

mm^>^a "' <'if >i|»**wjy i ^ww

70-

60-

—

•

i i i • MICROPHONE 5

^^^^^^%«^W^^A^MyPS

Run 1 MOOPHOE4E=T

i i I'll i i MICROPHONE 2

MICROPHONE 3

—• 1i—i i i i MICROPHONE 4

i i j i i i i MICROPHONE 5

j

* ij—"

iij*~ ,»

'

50i i i 1 1 1 ' i 'i i i i i 80t MICROPHONE 6 -* MICROPHONE 6

60-

50 -r—3

I r- 4 5 6 7

-i 1 i i i i 2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 6-2. Truck 6, Test 1, Runs 1,2. (Exterior)

-111-
KX)t

§ 90

O

" 80

70

100

90

804

70

100

Run 3

OPHORF3

Run 4

—i

1 ii 1——i

MICROPHONE 5

«

ii i' i i MICROPHONE 4

•^^^P^^M^M

I I I —I ' 1 ' I MICROPHONE 6

i i i i i ' ' i MICROPHONE 5

MICROPHONE 6

TIME, SECONDS

Figure 6-3. Truck 6, Test 2, Runs 3,4. (Exterior)

-112-

TIME, SECONDS
Run 6 Run 5 MICROPHONES

lOOi

90-

80-

70

100

I " 1 1 I I I 1 I MICROPHONE 2

1 i i i i i MICROPHONE 3

MICROPHONE 2

MICROPHONE 3

ii i i i MICROPHONE 6

i

' i i i 1 ' i

MICROPHONE 6

mi — *

12 3 4 5

TIME, SECONDS

I 2 3 4 5 6 7

TIME, SECONDS

Figure 6-4. Truck 6, Test 2, Runs 5,6. (Exterior)

-113-
Run 8

VI U U l/~

O

90

80

i ii i i i MICROPHONE 4

S^E

70

100-r ii i i ' i

'

i i

' i ' i i MICROPHONE 4

90

80

MICROPHONE 5

i——1 1 i t

i i i i MI CROPHONE 5

ii i i i i

1 " i MICROPHONE 6

2 3 4 5

TIME, SECONDS

12 3 4 5

TIME, SECONDS

Figure 6-5. Truck 6, Test 3, Runs 7,8. (Exterior)

-114-
KXh

90

< 80

CDo

70

i i i MICROPHONE 3

lOOi

\j~~\r:

MICROPHONE 3

^m

> lOOi

90

80-

70

MICROPHONE 4

bJ

_lLJ

xd

z»rt jm W

j*"*""-' ^>«. to —/-^ **^^ ^V /^ >k **' " ,,— ^^ ** / v, X

^•*vj v/ \f

1 ,

i i i i i

MICROPHONE 4

MICROPHONE 5

100

I I

' I I *""'' II I I III I MICROPHONE 6 - MICROPHONE 6

TIME, SECONDS

12 3 4 5

TIME, SECONDS

Figure 6-6. Truck 6, Test 3, Runs 9,10. (Exterior)

-115-
Run 11

KX)

J U U U ' u u u

90

80

70

Run 12

MICROPHONE 1

I00i

OO-i

90-

< 80

CD

_r 70

> 100

UJ

IDOCO

90

80

70JI00i

=*^

MICROPHONIA

MICROPHONE 2 MICROPHONE 2

MI CROPHONE 3

i i ii i MICROPHONE 4

MICROPHONF 3

i i i ii i MICROPHONE 5

MICROPHONE

• i i MICROPHONE 5

70 1 1 1 t —i i

i IOOt MICROPHONE 6

TIME, SECONDS

Figure 6-7. Truck 6, Test 4, Runs 11,12. (Exterior)

-116-

TIME, SECONDS

i ! i

i n iii i i i t -MICROPHONE 6
Run 13

OOi \i \r- - %» u ' u m

lOOr

90-

MICROPHONE 2

80- ac

70

>

ui

3O

CO

KX)

90

80+

70

100

90

70

I00i

90

80

70-1

MICROPHONE 2

MICROPHONE 3 MICROPHONE 3

i

1 i 'ii MICROPHONE 4

i i 1 i —i t i MICROPHONE 5

MICROPHONE 4

i i i MICROPHONF 5

ii i' i i i

' ti'i ? i i i MICROPHONE 6 - MICROPHONE 6

4 7

TIME, SECONDS

12 3 4 5

TIME, SECONDS

Figure 6-8. Truck 6, Test 4, Runs 13,14. (Exterior)

-117-
Run 16

lOOi

IOOi

90

80

MICROPHONE 2

70

KKH

90

< 80-

m

_r to

Ul> 100

111 _l

Q

—,—,—, 1 r MICROPHONE 3

3O

CO

90

70

ii i i MICROPHONE 4

IOOi

90

Run 15

MICROPHONE 1 ^ » 1 MICROPHONE 2

MICROPHONE 3

—i 1 1—i——i— i i MICROPHONE 5

MICROPHONE 4

70"1 1—r—i—i

t " i 1—'—i—>—

IOOi MICROPHONE 6

MICROPHONE 5

ii i i i

1 MICROPHONE 6

TIME, SECONDS

I 2 3 4 5

TIME, SECONDS

Figure 6-9. Truck 6, Test 5, Runs 15,16. (Exteriorl

-118-
Run 18 Run 17

KX)n

\t U u

- u U 1/

lOOi

90

80-

90-

< 80

GO

3O

90

70

100

MICROPHONE 2

70- 1 —< 1 1 r

lOOn MICROPHONE 3

MICROPHONE 2

==^

_i 70* i 1 i i

> 100, MICROPHONE 4

MICROPHONE 3

ii i i MI CROPHONE 5

MICROPHONE 4

n 1 » > MICROPHONE 6

MICROPHONE 5

^^:

ii i i i

1

1 i MICROPHONE 6

TIME, SECONDS TIME, SECONDS

Figure 6-10. Truck 6, Test 5, Runs 17,18. (Exterior)

-119-

Interior

Truck 06

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Open 74 72

(Stationary) 2 Left Closed 74 74

2. Acceleration 3 Right Open 93 93

(Stationary) 4 Right Open -- --

5 Left Closed 92 91

6 Left Closed 92 92

2. High Idle 3 Right Open 93 93

(Stationary) 4 Right Open 94 93

5 Left Closed 93 92

6 Left Closed 93 92

3. City Start Up 7 Right Open 94 94

8 Right Open 94 94

9 Left Closed 92 92

10 Left Closed 93 93

4. J366 11 Right Open 94 93

(Acceleration) 12 Right Open 94 94

13 Left Closed 94 94

14 Left Closed 94 94

5. J366 15 Right Open 93 92

(Deceleration) 16 Right Open 94 93

17 Left Closed 92 92

18 Left Closed 92 91

Table 6-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 6.

121-
90r

80

70-

60

90

80-

70

60

< 80

m

_r 70

UJ> 100

u

O

90

80

LEFT EAR

Run 1 RIGHT EAR

Run 1

i i i ' i i i i Run 2

i i i ii

.Run 2

i ' i i ' i ' i Run 3

Run 4

i i ii

i i i Run 3 ±±S2=

i i ' i i i Run 4

TIME, SECONDS TIME, SECONDS

Figure 6-11. Truck 6, Tests 1,2, Runs 1-6. (Interior)

-122-
100-t

80-

70-

LEFT EAR

Run 7 RIGHT EAR

Run 7

Run 8 Run 8

I00i

3 loo-i

90-

80 •

70-

Run 9

m,A" "\,/^ 's

Run 9

Run 10 Run 10

IUU"

Oft. W ^^w<~vy -^y^w;—- ^^ ~V 1 -?—

^

^v^/ -^v< -^

^Vt^ -?N

V

80'

Figure

1

6-12.

2 3 4 5 6 7

TIME, SECONDS

Truck 6, Test 3, Runs 7-10.

-123-

1 2 3

TIME,

(Interior)

4 5

SECONDS

6 7
03o

2

UJ

5

100-i

90

804

70

IOOt

90

80 ~ 70-

100-

90-

804

70

LEFT EAR

Run 11

Run 12

Run 13

RIGHT EAR

Run 11

.^^:

Run 12

Run 13

100-r

80«

70

Run 14

i ii

2 3 4 5

TIME, SECONDS

Run 14

TIME, SECONDS

Figure 6-13. Truck 6, Test 4, Runs 11-14. (Interior)

-124-
2

UJ

3

100 ->

LEFT EAR

Run 15

Run 17

IOOi

90

80

70«

Sii

RIGHT EAR

Run 15

Run 16

Ai'-X.

Run 17

m X^«ii» )» ^^

Run 18

IOOi

90

80

70

J5^£

Run 18

-ccn."UPy

12 3 4 5 6 7 I TIME, SECONDS

Figure 6-14. Truck 6, Test 5, Runs 15-18. (Interior)

-125-

t i i i 3 4 5 6

TIME, SECONDS

Test Vehicle Number 7

-127-
u

OJ £>E

3

52

U

•r-t >

ID H

i

u

3

60

-128-
Truck Number : 7 Carrier (owner): Chemical Leaman Tank Lines, Inc.

Company Fleet Number: 1-416

Make: Mack

Model: F685ST

Serial Number: 2944

Year: 1968

Engine Governor Setting: 2000 rpm

Total Miles of Operation: 205,305

Miles Since Last Engine Overhaul: 26,684

Miles Since Any Exhaust Work: 28,354

Engine: Make - Mack

Model - Maxidyne

-129-
Exterior

Truck 07

TEST RUN SIDE (WINDOWS)

SOUND LEVEL , dB(A)

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Open 63 63 63 63 62 69

(Stationary) 2 Left Closed 62 63 63 63 63 69

2. Acceleration 3 Right Open

(Stationary) 4 Right Open 85 85 86 86 85 92

5 Left Closed 83 85 85 85 85 91

6 Left Closed

2. High Idle 3 Right Open

(Stationary) 4 Right Open 82 84 84 83 83 89

5 Left Closed 80 82 83 83 84 88

6 Left Closed

3. City Start Up 7 Right Open 84 84 83 83 83 87

8 Right Open 83 83 83 83 83 86

9 Left Closed 82 83 82 82 83 84

10 Left Closed 82 83 82 82 83 85

4. J366 11 Right Open 82 83 83 83 83 89

(Acceleration) 12 Right Open 81 82 83 82 83 88

13 Left Closed 83 84 83 84 83 90

14 Left Closed 83 84 83 83 84 89

5. J366 15 Right Open 83 84 83 82 82 88

(Deceleration) 16 Right Open 83 83 82 81 81 87

17 Left Closed 81 82 83 83 84 88

18 Left Closed 80 82 82 83 84 88

Table 7-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 7.

•130-
80n

Run 2 Run 1

70-

60-

50-1 80i

70-

60-

5oJ

80n

70-

60-

50^

80i

70

60

50^

80.

70-

60-

50-

80i

70

60-

50^

AjM/"*DfM>l-H'MsJF 1 1AI^~D/^DI I^KI r 1 mH».Kv-»rrlVJINE 1 mK-KvJrnvJNt 1

r-i r"ui_Jl_in _iLi-iii_ii _*u- »->_ r*vnrY"**,|^^'*'*v-rfV>**N^^^>n<s'^ i»—- ^•'""^"'w «. S*"^^"-^"^^

MICROPHONE 2 MICROPHONE 2

—«. j* ^^\^^ /w j-br t^v%/*^ *TW^rnr-*! mi —/^^V^-^^—u iTTrT/^M^^V"

i i i i \ . j—

MICROPHONE 3

1 1 ft ¥ I i MICROPHONE 3

«_» < - 0J -*— rrn f>-» ft* r-ifS*-i mrfl f o

1 >

UJn MICROPHONE 4 MICROPHONE 4

2

> O

(/)

,i "-"ii. <<» ,., -*\^. „ ,,^w*^ rf'i "****»**•* r -v

• 1 1 1 1 1 MICROPHONE 5

• „' • i • • MICROPHONE 5

_j_. -r« -^-v^O _ . _- -,, , u wv^-*vrf-/v*v'*vjv'^v-T--»«» ' *» 'Vv^**~ V-^-"-^^*^-——-TV*- •III

MICROPHONE 6 MICROPHONE 6

.^w ^Y-Y^aj"-^TMvwNfc%%r u ^-v^^ V«v v*"^VVV^WVVSj-vnj^A T—^ J^T^r -^*— ~ ~ - **•"" 'up\pl^V^, "^V^-uj"

' *

v

' i 1 i —i— -»—""

r~-

1 2 3 4 5 6

TIME, SECONDS

——i

-i 7

1 1 ' 1 1

1 1 1

1

1 2 3 4 5 6 7

TIME, SECONDS

Figure 7-2. Truck 7, Test 1, Runs 1,2.

-131-

(Exterior)
100!

Run 5

90

80

MICROPHONE

70' ' » ' » » I00i MICROPHONE 2

90

80

70 ' i • i . 1

1 i

=- —

lOOn MICROPHONE 3

90

< 80

m

o

_T 70

ui> IOOt

ui

"i^ii iXrf !^*^&i

o

90

80

M4CROP+40NE A

70* L' i -— t i, i i i i IOOt MICROPHONE 5

90

80

70x:

r 100

i ' i ' i "

* i MICROPHONE 6

Run 4

MICROPHONES

~> r i ~~

MICROPHONE 2

MICROPHONES

i i i i MICROPHONE 5

^fc

I " I I

' '! 1 I ' I I MICROPHONE 6

£

| |

!1 I 1111 I

I 2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 7-3. Truck 7, Test 2, Huns 4,5. (Exterior)

-132-
TIME, SECONDS

I 2 3 4 5 6 7

TIME, SECONDS

Figure 7-4. Truck 7, Test 3, Runs 7,8. (Exterior)

-133-
9Ch

-» • i i i i i MICROPHONE 3

i i 1 • 1

1 MICROPHONE 3

9Ch

° 80

Q

2

3O

t 1 r MICROPHONE MICROPHONES

MICROPHONE 5

90i

80

70-^

60

-» 1 1

1

1 i MI CROPHONE 6

1 1— T 1 II I MICROPHONE^S-

-r\.

_x ^m ^z

i i i 1 i 1 i

I 2 3 4 5 6 7

i — i 1 i i i -MICROPHONE 6

^ft^

I I 1 I 12 3 4 5 „6 7

TIME, SECONDS TIME, SECONDS

Figure 7-5. Truck 7, Test 3, Runs 9,10. (Exterior)

-134-
Run 12

\t u u u tr

lOCh

90-

80

MICROPHONE 2

ZSii

70—i »i

OOi MICROPHONE 3

90

< 80

mp

' J 70

i&j KX)

_i

Q

; z

3

CO

90

80 y—rvHf^ __ - ^

90

80-

70

MICROPHONE 6

12 3 4 5

TIME, SECONDS

MICROPHONE 2_

i " i i i i i 'i MICROPHONE 4

I' 1 ! ' ' » ' " 1 I MICROPHONE 3

70 * 'i i — i i

' i ^ IOOt MICROPHONE 5

» i i

' i MICROPHONE 4

MICROPHONE 5

^3!

MICROPHONF 6

—r- 2 3 4 5

TIME, SECONDS

7

Figure 7-6. Truck 7, Test 4, Runs 11,12. (Exterior)

-135-
KXb

lOOi

9a

80

7Q

KXh

100

90

80

MICROPHONE 2 MICROPHONE 2

MICROPHONE 3 MICROPHONE 3

i i ii

MICROPHONE 4

i i 1 i

"

i MICROPHONE 5

MICROPHONE 4

^

70

lOOi

T I 1 I MICROPHONE 6

I i r MICROPHONE 5

i i i 1 1 " ' i i MICROPHONE 6

E

I

1

' l I ' « ' 2 3 4 5 6

TIME, SECONDS TIME, SECONDS

Figure 7-7. Truck 7, Test 4, Runs 13,14. (Exterior)

-136-
Run 15

KX)t~

IOOi

<

OD

_r

UJ>

UJ

_Jo

z

8

lOOn

100

90

80

70

100

90

80

70-

100

90

80-

70

MICROPHONE 4

i" "i i "• 1 ^ MICROPHONE 5

MICROPHONE 4

^""V*"^

MICROPHONE 5

MICROPHONE 6

-T-4

-r-6

MICROPHONE 6

TIME, SECONDS

2 3 4 5

TIME, SECONDS

Figure 7-8. Truck 7, Test 5, Runs 15,16. (Exterior)

-137-
100-

90

Run 18

\J u U U U ' u u MICROPHONE 1 =

Run 17 ^ -" Vl M u u u w

80 ^S2 !S^i

70' ' i ' ' i t

I. i fi n ii -.=.--

100, MICROPHONE 2

90-

MICRQPHONEJ-

_i ft _ :>^.

80

MICROPH0hl£_2__

I00i

II I I I I MICROPHONE 5

70J r I00t

90

80-

70

i i i i MICROPHONE 6^—

MICROPHONE 5

I ' » ' T- ~ I I

1 '> MICROPHONE 6

r ' i i ' 'i' '» 2 3 4 5 6

"i7

TIME, SECONDS

I 2 3 4 5 6 7

TIME, SECONDS

Figure 7-9. Truck 7, Test 5, Runs 17,18. (Exterior)

-138-
Interior

Truck 07

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Open 72 71

(Stationary) 2 Left Closed 72 70

2. Acceleration 3 Right Open 90 89

(Stationary) 4 Right Open 90 88

5 Left Closed 89 88

6 Left Closed 87 86

2. High Idle 3 Right Open 91 90

(Stationary) 4 Right Open 90 90

5 Left Closed 92 92

6 Left Closed 89 89

3. City Start Up 7 Right Open 92*/88 88

8 Right Open 95*/90 91

9 Left Closed 89 89

10 Left Closed 95*/88 90*/88

4. J366 11 Right Open 92 90

(Acceleration) 12 Right Open 90 89

With bedding 13 Left Closed 90 90

14 Left Closed 90 90

4. J366 15 Right Open 92 92

(Acceleration) 16 Right Open 89 90

Without bedding 17 Left Closed 92 90

18 Left Closed 91 90

5. J366 19 Right Open 91 91

(Deceleration) 20 Right Open 91 90

With bedding 21 Left Closed 91 90

22 Left Closed 91 90

Table 7-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 7.

139-
LEFT EAR

Run 1 RIGHT EAR

Run 1 90i

TIME, SECONDS TIME, SECONDS

Figure 7-10. Truck 7, Tests 1,2, Runs 1-6. (Interior)

140-
100 -t

LEFT EAR

Run 7 RIGHT EAR

Run 7

Run 8 Run 8

IOO-i

Run 10

TIME, SECONDS

Run 10

TIME, SECONDS

Figure 7-11. Truck 7, Test 3, Runs 7-10. (Interior)

-141-
I00«

90

80

70-

LEFT EAR

Run 11

RIGHT EAR

Run 11

Run 12 Run 12

2

UJ

-Ia

z

8 iooi

CO 904

80

70-

Run 13

yVW1-*ry<

Run 13

lOOi

Run 14

TIME, SECONDS

Run 14

=EE^

6

TIME, SECONDS

Figure 7-12. Truck 7, Test 4 (with bedding), Runs 11-14. (Interior)

-142-
100-

LEFT EAR

Run 15

90-

80<

70-

RIGHT EAR

Run 15

100

90-

80-

<

7*

Run 16 Run 16

-,'-»"'") /*"- - -~.»^——/*»* »- aca^n i um *cc—a»—

2UJ

(/> 100-1 Run 17 Run 17

w^

lOOn

Run 18 Run 18

2 3 4 5

TIME, SECONDS TIME, SECONDS

Figure 7-13. Truck 7, Test 4 (without bedding), Runs 15-18. •' (Interior)

-143-
lOO-i

LEFT EAR

Run 19

RIGHT EAR

Run 19

Run 20 Run 20

^wv:

UJo Run 21 Run 21

Run 22 Run 22

VJW

90.

-^^—~— — -- - . . .:_

N"'rv-'V^v_

^ ~~x-r'\-v^^*-J^-\ , ftO* ^^^-^yv-N — —

1 2 3

TIME,

4 5

SECONDS

6 7 1 2 3 4 5

TIME, SECONDS

6 7

Figure 7-14. Truck 7, Test 5 (with bedding), Runs 19-22 (Interior).

-144-
Test Vehicle Number 10

-145-
t

E

u>

wH

too

•146-
Truck Number : 10

Carrier (owner): Safeway Stores, Inc.

Company Fleet Number: 283B

Make: Freightliner

Model: WFT6364T

Serial Number: CA113HP057327

Year: 1971

Engine Governor Setting: 2600 rpm

Total Miles of Operation: 1,976

Miles Since Last Engine Overhaul: Original engine

Miles Since Any Exhaust Work: Original exhaust system

Engine : Make - Cummins

Model - 903

•147-
Exterior

Truck 10

TEST RUN SIDE (WINDOWS)

SOUND LEVEL, dB(A)

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Open 66 66 66 65 65 73

(Stationary) 2 Left Closed 64 65 66 65 66 73

2. Acceleration 3 Right Open 88 90 90 88 86 95

(Stationary) 4 Right Open 88 89 90 88 86 . 95

5 Left Closed 85 86 88 88 89 94

6 Left Closed 85 86 88 88 89 94

2. High Idle 3 Right Open 88 89 90 88 86 94

(Stationary) 4 Right Open 88 90 90 88 86 94

5 Left Closed 84 86 88 90 89 94

6 Left Closed 84 86 88 89 89 94

3. City Start Up 7 Right Open 88 89 87 87 88 93

8 Right Open 87 87 87 87 88 93

9 Left Closed 88 88 88 87 89 93

10 Left Closed 88 89 87 88 89 92

4. J366 11 Right Open 87 88 88 88 89 94

(Acceleration) 12 Right Open 87 88 88 88 89 95

13 Left Closed 89 89 89 88 86 94

14 Left Closed 88 89 89 88 87 94

5. J366 15 Right Open 88 88 87 86 86 92

(Deceleration) 16 Right Open 88 88 89 88 86 94

17 Left Closed 86 88 88 88 89 93

18 Left Closed 86 87 88 89 89 93

Table 10-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 10.

-148-
80

704

60

50

Run 2 MI CROPHONES

Vfti W» ^^ »/* «-

80t

7CH

60

-i 1 i i i MICROPHONE 2

i i

Run 1 MI CROPHONIA

i i i

1 1 MICROPHONE Z_

i "

i i r MI CROPHONE 4

8 7C^

60-

50-1 1

i i ii i 80-, MI CROPHONE 5

i i i 1 MICROPHONE-4

704

60

50

—i 1 1 i

1

1 MICROPHONE 5

80T

70-

60-

50

MICROPHONEST"

4

i i 3 4 5 6

TIME, SECONDS

7

l i

1 1 V I | MICROPHONES

i i 2 3-i r- 4 5

i i 6 7

TIME, SECONDS

Figure 10- 2 . Truck 10, Test 1, Runs 1,2. (Exterior)

-149-
IOOi

Run 3

—i i i ii i i MI CROPHONE 3

lOCh

90

80

70

100

90

804

70

i i i i i MICROPHONE 2

i i i i i i MICROPHONE 4

MICROPHONE 5

» i— i i MICROPHONE o~

5

TIME, SECONDS

Run 4

MICROPHONIA

-i- » ii 1 i ' » '>' i MICROPHONE 2

i ' i ' • < i • MICROPHONE-3—

*' i i ' MICROPHONE 4

MICROPHONE 5

^

7

MICROPHONE 6

i

• » i

i i

2 3 4 5 6

TIME, SECONDS

Figure 10-3. Truck 10, Test 2, Runs 3,4. (Exterior)

-150-
Run 6

KX)i

lOOi

90

soya

90

< 80

70

a)

70*

lOOi

90

80

Run 5 MI CROPHONES

MICROPHONE 2

» ' 'i ' 'i ' 'i

MICROPHONE 3

'i' i , i i i i -MICROPHONE 2

MICROPHONE a

MICROPHONE 4

T 1

1

' I I MICROPHONE 5

M4CROPHONE 4

70 '

' i "i i i i

' < - i IOOt MICROPHONE 6

I

1 I 'I I l i P'l

MICROPHONE 5

III i r i 'i > MICROPHONE 6

2 3 4 5

TIME, SECONDS

3 4 5

TIME, SECONDS

Figure 10-4. Truck 10, Test 2, Runs 5,6. (Exterior)

-151-
OOi

IOCH

100

90

80

70

MICROPHONE 3

i ' t ' i i ' i MICROPHONE 3

r

'' ' i i ' i" ' i

" MICROPHONE 4

i J i i 'i MICROPHONE 4

i i

'

' i i i MICROPHONE 5 MICROPHONE 5

' i

' —•—" 'i MICROPHONE 6 MICROPHONE 6

5 6 7

TIME, SECONDS TIME, SECONOS

Figure 10-5. Truck 10, Test 3., Runs 7,8,

-152-

(Exterior)
Run 9

I r MICROPHONE 4

T 1 1 I T -Mt€ROFHONE6

MICROPHONE 5

^\s

#^r^ta \ ./" ~"\-^ N/ ^

/

s/

MICROPHONE 6

TIME, SECONDS TIME, SECONDS

Figure 10-6. Truck 10, Test 3, Runs 9,10. (Exterior)

-153-
90

80i

Run 11

3flCE

Run 12 u——u—u—-u—u—u—v.

70

lOOi

90

80-

70

lOCh

1 i ' '» i MICROPHONE 2

MICROPHONE 1

MICROPHONE 2

90-

< 80

m

•o_T 70

ui

> 100

111

MICROPHONE 3

3OCO

90

80 -

70

lOOi

90

80

70

100

90

804

70

i i i —i

1 1 < i MICROPHONE 6

S ^

4 5

TIME, SECONDS

6

i

'

' ' i ' ' i ' i

' i

1

' '

' i MI CROPHONE 4

MICROPHONE 3

i i 1 i

i ill i i MICROPHONE 5

MICROPHONE 4

I J 1 r MICROPHONE 5

^z.

7

MICROPHONE 6

zs:5

i-i i » 'i » 12 3 4 5

TIME, SECONDS

Figure 10-7 o Truck 10, Test 4, Runs 11,12. (Exterior)

-154-
lOO-i

7

90

80

Run 14

-U ' " v~~\/-"-u—u V Run 13

a——v) u-—v—u- MI CROPHONE 1

70

IOOi

^MI CROPHONE 1 ^

Z

90

80

MICROPHONE 2

i "• i

. p

' 1——i

MICROPHONE 2

70

KXh

90

804

70

i ' • i i MICROPHONE 3 MICROPHONE 3

MICROPHONE 6

5

i—i ' i

• i i i i • i 'i i MICROPHONE 6

z^z

^:

2 3 4 5

TIME, SECONDS

12 3 4 5

TIME, SECONDS

Figure 10-8, Truck 10, Test 4, Runs 13,14. (Exterior)

-155-

6 7
Run 16

KXh

90

< 80t

m

Ul> 100

ui

i ii ii

MICROPHONE 3

^^M,

rs

3OCO

90

80

70

100

i" i i i 'i

MICROPHONE 4

90+

80

70

100

MICROPHONE 5

^^

90-

80-

70

l r i ———I- MICROPHONE 6 ^

'I I 12 3 4 5

TIME, SECONDS

• i i

MICROPHONE 3

MICROPHONE 4

a i j

i MICROPHONE 5

^XT.

i ' > i MICROPHONE 6

2 3 4 5

TIME, SECONDS

6

Figure 10-9. Truck 10, Test 5, Runs 15,16. (Exterior)

-156-
Run 18

irtr. I/——

u

1 u u—ir—u u

90

80-

-MCR0PHONE 1

70

lOOi

Run 17

i/—i/—u— u—u—tr——\j MICROPHONE 1

90-

80-

70

M4CRORHONE 2

ii it

I0O, MICROPHONE 3

MICROPHONE 2

MICROPHONE 3

100

90

80

70

i i i ' i i MICROPHONE 6 MICROPHONE 6

s

i i i i ' I

'

' i

I 2 3 4 5 6 7

TIME, SECONDS

i i i » i i i 2 3 4 5 6 7

TIME, SECONDS

Figure 10-10. Truck 10, Test 5, Runs 17,18. (Exterior)

-157-

Interior

Truck 10

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Open 72 71

(Stationary) 2 Left Closed 70 69

2. Acceleration 3 Right Open 95 89

(Stationary) 4 Right Open 95 90

5 Left Closed 91 87

6 Left Closed 90 87

2. High Idle 3 Right Open 91 89

(Stationary) 4 Right Open 91 90

5 Left Closed 91 88

6 Left Closed 91 88

3. City Start Up 7 Right Open 94 89

8 Right Open 95 89

9 Left Closed 90 87

10 Left Closed 90 87

4. J366 11 Right Open 94 90

(Acceleration) 12 Right Open 94 90

13 Left Closed 90 87

14 Left Closed 90 87

5. J366 15 Right Open 95 88

(Deceleration) 16 Right Open 94 88

17 Left Closed 90 88

18 Left Closed 90 88

Table 10-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 10.

-159-
LEFT EAR

Run 1 RIGHT EAR

Run 1 9CH

TIME, SECONDS TIME, SECONDS

Figure 10-11. Truck 10, Tests 1,2, Runs 1-6. (Interior)

-160-
100 -I

LEFT EAR

Run 7 RIGHT EARRun 7

Run 8 Run 8

CD

2UJ

_lo

z

3

Run 9 Run 9 100-r

lOOi

Run 10 Run 10

2 3 4 5 6

TIME, SECONDS TIME, SECONDS

Figure 10-12. Truck 10, Test 3, Runs 7-10. (Interior)

•161-
100 -r

90«

80

70-

LEFT EAR

Run 11

RIGHT EAR

Run 11

-^^^^^^~

^~^~*^—*~~* <*

so

<

7&

2

UJo

z

3(A 100^

Run 12

Run 13

Run 12

Run 13

OO^

Run 14

90- -*~"»

/- ' on« ou

7CH 12 3 4 5 6 7

TIME, SECON0S

Figure 10-13. Truck 10, Test 4, Runs 11-14.

-162-

Run 14

4

TIME, SECONDS

(Interior)
100 -i

LEFT EAR

Run 15

RIGHT EAR

Run 15

3

CDo

2

UJ

-IQ

Run 16

00"

/ ' s. 90« ~l

^^"^•^V-^^^** "~ >|—i^a^ r t ,, i an. ou*

Run 16

Run 17 Run 17

I0O

Run 18 Run 18

TIME, SECONDS TIME, SECONDS

Figure 10-14. Truck 10, Test 5, Runs 15-18. (Interior)

-163-

Test Vehicle Number 11

165-
uBD

S3O

•H>

to Hp

•H

fa

166-
Truck Number: 11

Carrier (owner): Safeway Stores, Inc.

Company Fleet Number: 133B

Make: Peterbilt

Model: 352ST

Serial Number: 24818

Year: 1967

Engine Governor Setting: 2100 rpm

Total Miles of Operation: 205,727

Miles Since Last Engine Overhaul: 4,063

Miles Since Any Exhaust Work: Original exhaust system

Engine: Make - Cummins

Model - NHC 250

167-
Exterior

Truck 11

TEST RUN SIDE (WINDOWS)

SOUND LEVEL, dB(A)

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Open 65 66 65 65 65 71

(Stationary) 2 Left Closed 64 64 65 65 65 71

2. Acceleration 3 Right Open 86 86 87 86 85 93

(Stationary) 4 Right Open 86 86 86 86 86 93

5 Left Closed 85 85 86 86 86 92

6 Left Closed 85 85 85 86 86 92

2. High Idle 3 Right Open 84 85 85 84 83 91

(Stationary) 4 Right Open 84 85 85 84 84 91

5 Left Closed 84 83 84 85 85 89

6 Left Closed 84 83 83 85 85 89

3. City Start Up 7 Right Open 85 85 85 85 86 91

8 Right Open 86 86 85 85 85 89

9 Left Closed 85 85 85 86 86 90

10 Left Closed 85 85 85 86 86 90

4. J366 11 Right Open 86 86 86 87 86 92

(Acceleration) 12 Right Open 87 86 87 86 85 93

13 Left Closed 86 86 86 86 86 92

14 Left Closed 85 86 86 86 87 92

5. J366 15 Right Open 85 83 83 83 83 89

(Deceleration) 16 Right Open 85 83 83 83 83 89

17 Left Closed 82 83 84 83 84 88

18 Left Closed 83 82 84 84 84 88

Table 11-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 11.

-168-
80i

70-

60-

50

Run 2 MI CROPHONE

lJ^ruTi ji .j—* ' r i urwu^puj i' i * ~~

' *"" ^^W * 'i i # " i fnw

80

70-

60

501

« 70

<

m

° 604

£ 50

£ 70-1

60-

50'

80

70-

60-

50

80

60-

50'

-r 1

1 i —i

' * i

Run 1 M1 CROPHGWET

u i ii n ii 1 » -«—

MICROPHONE 2

—i 1 1 i i

1 1 80i MICROPHONIA

I I I

1 r MICROPHONE. 2..

j**^***?^** ,^****-

I I II I MICROPHONE 4

i i

—i 1 1 i i i MICROPHONE 3

» i 1 1——i—

MICROPHONE 5

ii > i i i i MICROPHONE 4

i i i i i MICROPHONE 6

t 1 j i r MICROPHONE 5

'v^Jv^-ft-f^-^-^^^-^>v-'x-^v-^-^

1 I 1

I 2 3 4 5 6 7

' 1 1 1 1 1 - AAirPOPHONF A —i 1

•y it* i\»-fv\^f—i-iv^i** t \j

_^__^^_^^——~^^—^^-~^—^~=^_,—

-

J 1 1 -i

*^

i i I i

TIME, SECONDS

2 3 4 5 6 7

TIME, SECONDS

Figure 11-2. Truck 11, Test 1, Runs 1,2. (Exterior)

-169-
Run 3

lOO-i

Run 4

IOO-i

90-

80-

MICROPHONE 2

ii i n , r^^^^" i' i

I I » I > MICROPHONE 2

70 '* i

' ' ii d i i i i i i i KXh MICROPHONE 3 -. MICROPHONE 3

I I I! ""~" r—T I MICROPHONE 5

MICROPHONE 6

i i 3 4

^

i ii % ti i MICROPHONE 5

i i MICROPHONE 6

TIME, SECONDS

2 3 4 5

TIME, SECONDS

Figure 11-3. Truck 11, Test 2, Runs 3,4. (Exterior)

-170-
90-

80

70

lOOi

90

< 80-

m

o

J 70

UJ> 100

UJ

o

90

80-

70

lOOi

90

80-

70

100

90

Run 6 Run 5 MICROPHONIA

i » 1 » i lOOi MICROPHONE 2 MICROPHONES

MICROPHONE 3

i i i i i MICROPHONES

MICROPHONE ^

80-

70

i i -r- KOPHOKE 6

TIME, SECONDS

i —t •* i 1

i MICROPHONE 4

/

" J

f

/

1 MICROPHONE 5

i 'i i '

' i MICROPHONE 6

I | I I l i I

I 2 3 4 5 6 7

TIME, SECONDS

Figure 11-4. Truck 11, Test 2, Runs 5,6,

-171-

(Exterior)
Run 8

ill > 100

UJ

Z3O

90

80

70

lOOn

90

80-

i i i i i MICROPHONE 4 MICROPHONE 4

i i— i

» r MICROPHONE 5

^,

70

I00i

» ——

90

80

70

MICROPHONE 6

-r 1—! r—'

r- r- 2 3 4 5 6

II I'l l I

1 I I I MICROPHONE 6

TIME, SECONDS

I 2 3 4 5 6 7

TIME, SECONDS

Figure 11-5, Truck 11, Test 3, Runs 7,8. (Exterior)

-172-
lOCh MICROPHONE 5

100

I I ' I I I MICROPHONE 6

i i i i MICROPHONE 5

ii i ' i i MICROPHONE 6

2 3 4 5

TIME, SECONDS

12 3 4 5

TIME, SECONDS

Figure 11-6, Truck 11, Test 3, Runs 9,10, (Exterior)

-173-
KX)

90

Run 12

J

' 'U 1/ U l/""U \J

80-

90

80-

90-

< 80

00

_r

>

3O

70

100

90

80

70

100

90

80-

70

I00i

90

804

70

MICROPHON E 1 ^^

70 ' '——

"~~~*~—"

I0O, MICROPHONE 2

70' m

i

1 i r i lOOi MICROPHONE 3

MICROPHONE 4

' i i i » i MICROPHONE 5

MICROPHONE 6

^

^

T*

4

TIME, SECONDS

Run 11

7

MICROPHONE 1

=5^

MICROPHONE 2

MICROPHONE 3

MICROPHONE 4

-^

MICROPHONE 5

Z2L zr~sa:

i

' i \ i i » 12 3 4 5

TIME, SECONDS

• i

1 i » i

1 ' y » i MICROPHONE 6

6

Figure 11-7 . Truck 11, Test 4, Runs 11,12 (Exterior)

-174-
Run 14

u v v- u - \r~u u

> 100

3O

V)

90

80

70

MICROPHONE 4

^

MICROPHONE 4

S

i i i i i i * 'i i i i » » i IOOt MICROPHONE 5 t MICROPHONE 5

90

80-

70J , , 100

90

80'

70

i ii » i MICROPHONE 6 MICROPHONE 6

s

I

" I I I 1 I 12 3 4 5

TIME, SECONDS

6 7 12 3 4 5

TIME, SECONDS

Figure ll-8 Truck 11, Test 4, Runs 13,14. (Exterior)

-175-
90

SO

Run 15

-U U ' V"V" '\i MICROPHONE 1

70

lOOi

90

80-

MICROPHONE 2

70 *

i it i KX>i MICROPHONE 3

90

< 80-

m

-o_r 70

Ul

> 100

UJ

a ' i

IDo

90

70

i r i >HONE 4

100

90

80

MICROPHONE 5

Run 16

^MICROPHONE 1 =^

MICROPHONE 2

MICROPHONE 3

w .

' ' I

1 •' MICROPHONE 4

MICROPHONE 5

70 i

1 * ' i ' i i i i I ' n i

' m if' . . IOOt MICROPHONF 6 -. MICROPHONE 6

90-

80-

70

3

i

7

—

T- 4

TIME, SECONDS TIME, SECONDS

i i i

6 7

Figure 11-9, Truck 11, Test 5, Runs 15,16. (Exterior)

-176-
too

901

Run 17

u \j—\>—u v—u b

70

IOOi

9a

7Q

OOi

90-

< 80

m

_r 70

UJ> 100

3

o

CO

90

80

90

80

90

80

70

Run 18

MICROPHONE 1 3S0FHONE 1

MICROPHONE 2

i— i

MICROPHONE 2

MICROPHONE 3

I

it i i -MICROPHONE 3

i it ii

MICROPHONE 4 MICROPHONE 4

70* i ii i i i i ' ' i

« • • I00t MICROPHONE 5 ^ MICROPHONE 5

70J r

, , 100

| | I I | I I

I ' |

" ' ! | | | I | | > MICROPHONE 6 -. MICROPHONE 6

i "

i n » i

•y

2 3 4 5

TIME, SECONDS

12 3 4 5

TIME, SECONDS

• i 6 7

Figure 11-10, Truck 11, Test 5, Runs 17,18 (Exterior)

-177-

Interior

Truck 11

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Open 75 77

(Stationary) 2 Left Closed 74 75

2. Acceleration 3 Right Open 92 91

(Stationary) 4 Right Open 93 91

5 Left Closed 92 91

6 Left Closed 92 91

2. High Idle 3 Right Open 92 91

(Stationary) 4 Right Open 92 92

5 Left Closed 93 92

6 Left Closed 92 91

3. City Start Up 7 Right Open 92 89

8 Right Open 92 90

9 Left Closed 93 89

10 Left Closed 92 91

4. J366 11 Right Open 92 92

(Acceleration) 12 Right Open 92 92

13 Left Closed 92 92

14 Left Closed 93 92

5. J366 15 Right Open 92 92

(Deceleration) 16 Right Open 92 92

17 Left Closed 93 92

18 Left Closed 93 92

Table 11-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 11.

179-
LEFT EAR

Run 1 RIGHT EAR

Run 1 90t

234567 12345

TIME, SECONDS TIME, SECONDS

Figure 11-11. Truck 11, Tests 1,2, Runs 1-6. (Interior)

-180-
LEFT EAR

Run 7 100 -i

RIGHT EAR

Run 7

IOOt

Run 8 Run 8

Run 9 Run 9

-7^— ^-\

; f—•/

-

Run 10 Run 10

1^

5 6 7 I TIME, SECONDS

Figure 11-12. Truck 11, Test 3, Runs 7-10. (Interior)

4 5 6 7

TIME, SECONDS

•181-
100-i

90-

80-

70-

LEFT EAR

Run 11

•/~^»

RIGHT EAR

Run 11

^

ffi

2

3

100

90-

80- ~ 70-

Run 12

Run 13

Run 12

Z?~~

Run 13

I00i

80

TO

Run 14

rTM

4

Run 14

TIME, SECONDS

Figure 11-13. Truck 11, Test 4, Runs 11-14. (Interior)

-182-

i i i i 2 3 4 5 6

TIME, SECONDS
100 -i

LEFT EAR

Run 15

RIGHT EAR

Run 15

CO

100

90- cas=ai

80-

<

7C>

Run 16 Run 16

2UJ

(/> 100

Run 17 Run 17

I00i

Run 18 Run 18

2 3 4 5

TIME, SECONDS

Figure 11-14. Truck 11, Test 5, Runs 15-18.

TIME, SECONDS

(Interior)

-183-

Test Vehicle Number 12

185-
CDey

•rl Xi

CD >

4-1 COI CN

CD

00

•i-l

186-
Truck Number: 12

Carrier (owner): Safeway Stores, Inc.

Company Fleet Number: 237B

Make: Kenworth

Model: K123

Serial Number: 208486

Year: 1969

Engine Governor Setting: 2100 rpm

Total Miles of Operation: 139,357

Miles Since Last Engine Overhaul: Original engine

Miles Since Any Exhaust Work: Original exhaust system

Engine : Make - Cummins

Model - NHC 250

-187-
Exterior

Truck 12

TEST RUN SIDE (WINDOWS)

SOUND LEVEL, dB(A)

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Open 65 65 68 66 65 72

(Stationary) 2 Left Closed 66 65 68 66 66 71

la Right Open-Air* 66-78 66-78 66-83 67-78 66-78 71-87

2. Acceleration 3 Right Open 86 86 86 85 84 89

(Stationary) 4 Right Open 86 86 87 85 85 89

5 Left Closed 85 84 86 87 86 89

6 Left Closed 85 84 86 87 86 89

2. High Idle 3 Right Open 86 87 85 84 84 88

(Stationary) 4 Right Open 86 86 85 84 84 88

5 Left Closed 84 84 87 87 86 91

6 Left Closed 84 83 85 87 86 89

3. City Start Up 7 Right Open 87 85 87 87 87 88

8 Right Open 87 85 86 86 87 87

9 Left Closed 86 87 87 85 86 88

10 Left Closed 87 86 86 85 86 86

4. J366 11 Right Open 87 87 88 87 86 90

(Acceleration) 12 Right Open 87 86 88 87 86 91

13 Left Closed 86 85 86 86 86 89

14 Left Closed 86 86 87 86 86 89

; 5. J366 15 Right Open 87 85 85 84 82 88

(Deceleration) 16 Right Open 86 85 85 84 83 87

17 Left Closed 83 83 84 85 85 87

18 Left Closed 83 83 84 85 85 87

*Air from blowoff valve.

Table 12-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 12.

-188-
80i

Run 2

70-

60-

50

MI CROPHONE 1

—

1 i i 80i MICROPHONE 2

70

604

-£-~

50

SO-i

70-

<

m

"° 60-1

uiw 50 ~ 80,

S 704

60

50

80-p

70-

60

50

-VIm/V,^.

80i

70-

^^

60-

50

i i i i MICROPHONE 6

.,*-rf-»-^#^^-*i

i

Run 1

-M4€ROP"HO~NET

^*W « iy-i. » i%iyA<^''»w»^<^\/w

1 1 I 1 'I ' I t MICROPHONE 3

i i i i MICROPHONE2

1 1

T 1 I I I 1 I MICROPHONE 4

i 1 i 1 i i i MICROPHONE 3

<^A*>^Jvs.+P»-'>f>**~**,^f*- •***s

—I

1 1 1 1 • MICROPHONE 5

-i 1 1 1 i MICROPHONE 4

—i 1—i—i r MICROPHONE 5

i 1 i i i .MICROPHONE 6

a.

I 2 3 4 5 6 7

TIME, SECONDS

Figure 12-2. Truck 12, Test 1, Runs 1,2.

-189-

2 3 4 5

TIME, SECONDS

-i 1 6 7

(Exterior)
CDo

_r

Ul>

o

z

o

Run la

90t

90

80

70

i » i i i MICROPHONE 2

^*W>— a i\a—

»* >»» 60

9Ch

80

70

60J—

90-r

80

70

60

MICROPHONE 3

'

MICROPHONE 4

MICROPHONE 5

60-* • 1

1 i——i 1 i 90t MICROPHONE 6

-^ * ii i 2 3 4

i5 6

TIME, SECONDS

-i7

Figure 12-3. Truck 12, Test 1 (air), Run la. (Exterior)

-190-
Run 4

KX)i

90

aa

MI CROPHONIA

^

m

TO

100-

soso

70

lOOi

SO

< so

ffi J 70

UJ> 100

§ SO

O

W

80

70

lOOi

SO

80

70

100

MICROPHONE 2

MICROPHONE 3

:z^

MICROPHONES

-I 1 1 r- 2 3 4 5

TIME, SECONDS

Run 3 MI CROPHONES

i— i ii i MICROPHONE 4-

• r i i i i i MICROPHONE 5

7

ii i i i MICROPHONE 2

A^^o-

-MiCROPHQNE-3

* > « >HONE 4

i i j i »i

MICROPHONES—

MICROPHONES

3 4 J TIME, SECONDS

-i7

Figure 12-4. Truck 12, Test 2, Runs 3,4. (Exterior)

-191-
IOOi

Run 5

AAlfDflPHOKJF 1 /v\iv-Kv^rnv^iNC i on. 3U

/v ^^^ ^#J *j *. — — -*J^ m i _ p ^r no. BIT r

/f

/ 7oJ

Run 6

MI CROPHONIA

IOOi

90

80-

70

MICROPHONE 2

MICROPHONE 3

MICROPHONE 2

=£

^

90-

m

MICROPHONE 3

3Oto

90

80-

70

^=

lOOr- - MICROPHOJ

90

80-

70-1-1 1 ' 100

90

80-

70

—i r 1 1 | MICROPHONES-—r-

.^— .-T3

1 i i r- 2 3 4 5

TIME, SECONDS

7

» ii i i i MICROPHONE 4

i i i MICROPHONES

i ii i i i i —MICROPHONE 6

2 3 4 5

TIME, SECONDS

Figure 12-5. Truck 12, Test 2, Runs 5,6. (Exterior)

-192-
100

90+

SO

Run 8 —

U

if MI CROPIvi ir —ti

V /—

70

iOOi

90-

80

MICROPHONE 2

:zi =s:

70' i ' • ' ii ' i 'i KXh MICROPHONE 3

MICROPHONE 2

" 7*

90-

< 80

MICROPHONE 3

_*c

3

o

90

70

-• 1 • i MICROPHONE 4

80 -7—

7=- -vT

ii i ii

MICROPHONE 5

100n

T 1 i 1 r MICROPHONE 6

• T

MICROPHONE 5

MICROPHONE 6

TIME, SECONDS TIME, SECONDS

Figure 12-6. Truck 12, Test 3, Runs 7,8. (Exterior)

-193-
Run 10

70

ui

> 100

§ 90

8 m

70

KXH

90

80"

70-

100

90

80

70

-t -• 1 r i r MICROPHONE 3 MICROPHONE 3

i • "i i i ii

MICROPHONE 4

-t——i—r— ' ii i i — MICROPHONE 5

MICROPHONE 4

xz:

MICROPHONE 6

^n

-?-

i i r i

1

' "I 2 3 4 5 6 7

TIME, SECONDS

I 2 3 4 5 6 7

TIME, SECONDS

Figure 12-7. Truck 12, Test 3, Runs 9,10 o (Exterior)

-194-
Run 12 Run 11

KX)

90

80

\r——u——u u w—-u V. MI CROPHONE 1

2=

70 * » hi lOOi

90-

80

MICROPHONE 2

70

O0-

90-

< 80

^

m

o

_r 70

UJ> 100

UJ

MICROPHONE 3

./ v.. ZZl

§ 904

o

" 80

70

i t i i i MICROPHONE 4

IOOt

90

80

zzz

'•

MI CROPHONE!

i i ' i i 'i 'i * i MICROPHONE 2

MICROPHONE 3

—

i 1 • ' i ' i MICROPHONE 4

1—i ii i ' i i M4CROPHONE 5 MICROPHONE 5

70-1 , r i 1 i 1 *! • • • • » 100 MICROPHONE 6 - MICROPHONE 6

90-

80-

70 i i i i i 2 3 4 5 6

TIME, SECONDS

^r

2T

T- 1 I I "

' » I

Figure 12-8. Truck 12, Test 4, Runs 11,12.

-195-

12 3 4 5

TIME, SECONDS

(Exterior)

6 7
IOOi

Run 13 Run 14

"U U U U—*U L

90

eo70

IOOi

90

80

701 KXh

90-

< 80-f

CD

_r 70

Ul> 100

3O

90

80

70

IOOi

90

80

MI CROPHONE 1 MICROPHONE

MICROPHONE 2

t—->—i i i i i h i

' i MICROPHONE 2

MI CROPHONE 3

• i i MICROPHONE 4

MICROPHONE 3

MICROPHONE 4

i ii i ii i * i j i MICROPHONE 5 -, MICROPHONE 5

^

i t i

' i i i t i

\

. . MICROPHONE 6 -. MICROPHONE 6

TIME, SECONDS

2 3 4 5

TIME, SECONDS

• i

6 7

Figure 12-9. Truck 12, Test 4, Runs 13,14. (Exterior)

-196^
Run 16

Iqq l< u—u u w——vr

90+

eo

MICROPHONE 1

ZZL zs:

70

lOOi

80

MICROPHONE 2

701

lOOi

90-

< 80

03o

_r 70

ui

> 100

3

oCO

90

80

70

100

90

80

70-

100

90

80

70

-£i,

MICROPHONE 3

^^

I ii

MICROPHONE 4

:s;

—i 1 i i i MICROPHONE 5

-T-4

TIME, SECONDS

• i MICROPHONE 2

MICROPHONE 3

MICROPHONE 4

i i i i ' i '

' i MICROPHONE 6

MICROPHONE 5

MICROPHONE 6

1

7 3 4 5

TIME, SECONDS

Figure 12-10. Truck 12, Test 5, Runs 15,16. (Exterior)

-197-
100

90

Run 17

J U ' - u u u ~U ' u Run 18

80

70

J U U U U y L MI CROPHON E 1 MI CROPHONE 1

I00i

9a

70

MICROPHONE 2

T r*- I I

MICROPHONE 2

MICROPHONE 3

70 ' i » > i " 1——'

' » jOOt MICROPHONE 6

I 2

i

1 i ii ii

MICROPHONE 3

i ' " i ' i ' i i i > MICROPHONE 6

TIME, SECONDS

3 4 5

TIME, SECONDS

Figure 12-11. Truck 12, Test 5, Runs 17,18. (Exterior)

-198-
Interior

Truck 12

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Open 72 72

(Stationary) 2 Left Closed 74 73

2. Acceleration 3 Right Open 92 91

(Stationary) 4 Right Open 92 90

5 Left Closed 90 91

6 Left Closed 90 89

2. High Idle 3 Right Open 90 89

(Stationary) 4 Right Open 91 89

5 Left Closed 90 88

6 Left Closed 90 88

3. City Start Up 7 Right Open 91 91

8 Right Open 91 91

9 Left Closed 91 91

10 Left Closed 91 91

4. J366 11 Right Open 91 91

(Acceleration) 12 Right Open 91 90

13 Left Closed 91 91

14 Left Closed 90 90

5. J366 15 Right Open 91 88

(Deceleration) 16 ! Right Open 90 88

17 Left Closed 90 90

18 Left Closed 90 90

Table 12-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 12.

199-
LEFT EAR

Run 1 90

RIGHT EAR

Run 1

80-

70-

60

90

80-

70

i ' i Run 2

60

KXK

i "

i i i i Run 3

Run 2

v--rr^w "—fX^/"*

r-^r^ •'V'-^^-^-—»-r,i%. «^j-*

• 1 1 1—i r— 1 1——

90

< 80

CDo

_J 70

ui> IOOt

LU

-Ia

vM %r ^^n.

Run 1 r

3O

90

80

70

a»j-*w* i r-\mt^y

'Run 5

1 Run 5

A

. --/ \ !!<-*>_- - ' -,

— m i w^ \j i —

i J—

I .... -

- —

i 1 1 1 1 1 I00n Run 6

3 4 5

TIME, SECONDS

3 4 5

TIME, SECONDS

Figure 12-12. Truck 12, Tests 1,2, Runs 1-6. (Interior)

200-
100-i

LEFT EAR

Run 7 RIGHT EAR

Run 7

Run 8 Run 8

Run 9

lOOr

Run 10 Run 10

2 3

TIME, SECONDS TIME, SECONDS

Figure 12-13. Truck 12, Test 3, Runs 7-10. (Interior)

-201-
IOO-i

90

80-

70-

LEFT EAR

Run 11

m

RIGHT EAR

Run 11

</)

lOOi

90

80

3

70"

CDTJJ"

MJ

>JO

100-r

Run 12

, ,» h i i ^ ' ir* w .^, » . - ^.

Run 13

Run 12

Run 13

IOO-i

90

80f

70-

Run 14

2 3 4

TIME, SECONDS

Run 14

2 3 4

TIME, SECONDS

Figure 12-14. Truck 12, Test 4, Runs 11-14. (Interior)

-202-
LEFT EAR

Run 15

100"

RIGHT EAR

Run 15

90

80<

70-

-*5^

^s^-

Run 16 Run 16

1001

90

80

^2^

3 *>

ffl "O

_JO

z

3 ioo90-1

80

70«

Run 17 Run 17

/s-^^qc; "^VV^-^^

Run 18 Run 18

1 00-1

5 6 7 I TIME, SECONDS

Figure 12-15. Truck 12, Test 5, Runs 15-18. (Interior)

4 5 6

TIME, SECONDS

•203-

Test Vehicle Number 13

•205-
ro

U

B

»ft

-206-

0) >

CO

cu H

i en

cu

•-I fa
Truck Number: 13

Carrier (owner): Anchor Motor Freight, Inc.

Company Fleet Number: 3244 Wl

Make : GMC

Model: HI 9630

Serial Number: D 201474

Year: 1971

Engine Governor Setting: 2250 rpm (no load)

Total Miles of Operation: 4,500

Miles Since Last Engine Overhaul: Original engine

Miles Since Any Exhaust Work: Original exhaust system

Engine: Make - Detroit Diesel

Model - 6-71

-207-
Exterior

Truck 13

TEST RUN SIDE (WINDOWS)

SOUND LEVEL, dB(A)

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Open 63 64 64 64 62 70

(Stationary) 2 Left Closed 63 64 65 64 63 70

2. Acceleration 3 Right Open 84 87 88 86 86 93

(Stationary) 4 Right Open 84 87 88 86 86 92

5 Left Closed 86 88 88 86 84 94

6 Left Closed 86 88 88 85 84 94

2. High Idle 3 Right Open 79 80 80 80 80 87

(Stationary) 4 Right Open 79 80 80 80 80 87

5 Left Closed 80 81 79 79 78 86

6 Left Closed 80 81 80 78 78 86

3. City Start Up 7 Right Open 85 85 85 85 84 92

8 Right Open 85 84 86 85 84 92

9 Left Closed 84 85 85 84 82 91

10 Left Closed 84 84 84 85 83 91

4. J366 11 Right Open 86 87 88 86 86 93

(Acceleration) 12 Right Open 87 87 87 86 86 93

13 Left Closed 86 88 88 87 87 93

14 Left Closed 86 86 86 87 86 92

: 5. J366 15 Right Open 82 82 83 81 80 85

(Deceleration) 16 Right Open 82 82 82 80 78 84

17 Left Closed 78 80 80 81 81 85

18 Left Closed 78 79 80 80 81 84

Table 13-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 13.

208-
Run 2 80n

70

60-

50

MI CROPHONIA

8O1

70

60-

50

80

i i i i MICROPHONE 2

^ 704

<

m

o 604

iii w 50

Q

2

I TO

60

50-

80

70

604

50

—i

1 i i MICROPHONE 5

80t

70-=^,

60

50

-MICROPHONES

4

TIME, SECONDS

—

r- 6

Run 1 MICROPHONIA

i i 1 'i i i MICROPHONE 3

i i 1 i t _ M1CRQRHQNE 2

MICROPHONE 3

—i ' i

1 i i 1 80t- — MICROPHONE 4

T •

MICROPHQNE-4

T I II |

1

1 MICROPHONE 5

MICROPHONE6

H i- i— tj - -' •~m mii mj\ <nj*jM*j^.

-I 1 T~ 2 3 4

i i 6 7

TIME, SECONDS

Figure 13-2. Truck 13, Test 1, Runs 1,2. (Exterior)

-209-
KX)i

90

SO

70

Run 4

MICROPHONE?

^c

9a

80

—MICROPHONE 2

?

70

OOn

^r

Run 3

MICROPHONIA

i

TIME, SECONDS

• 'i 1 ii i MICROPHONE 3

^UCROPHONE 2

• i MICROPHONE 3

i « i—<

i" » » ' » ' i MICROPHONE 4

i i j i • MICROPHONE 5

i

£=

i i i

1 i ' »

" " i

I 2 3 4 5 6 7

TIME, SECONDS

Figure 13^3. Truck 13, Test 2, Runs 3,4. (Exterior)

-210-
Run 5

KXh

100

90

80

70

I00i

Run 6

JPHONfe-l

MI CROPHONE 5

ii i • • i MICROPHONE 5

MCROPHONE 6

i i i ii t MICROPHONES

2 3 4 5

TIME, SECONDS

3 4 5

TIME, SECONDS

Figure 13-4. Truck 13, Test 2, Runs 5,6. (Exterior)

-211-
Run 7

TIME, SECONDS

2 3 4 5 6 7

TIME, SECONDS

Figure 13-5. Truck 13, Test 3, Runs 7,8. (Exterior)

-212-
1

1 MICROPHONES

i " i i t i MICROPHONE 3

MICROPHONE 2

s

ft

_ » MICROPHONE 3

lOOi

90

804

70

i ii

MICROPHONE 6

-w

S ii i i i 'i i

I 2 3 4 5 6 7

MICROPHONE 6

^7

S

3E

TIME, SECONDS

2 3 4 5 6 7

TIME, SECONDS

Figure 13-6. Truck 13, Test 3, Runs 9,10. (Exterior)

-213-
UJ>

y

o

z

oCO

IOOt

90

80

70-1

MI CROPHONE 6

4

ii i i i i ^ MICROPHONE 6

A- \

TIME, SECONDS

2 3 4 5

TIME, SECONDS

Figure 13-7. Truck 13, Test 4, Runs 11,12. (Exterior)

-214-
100

Run 13 Run 14

u u u u—-v—tr90

MICROPHONE 1

3Q. rs.

'1

70

IOOi

90

80H

MICROPHONE 2

MI CROPHONE 1

z

._ . '>/

sz

^cr70

O0i

MICROPHONE 2

7^

^*-~s/

90-

UJ>

UJ

r>o

MICROPHONE 3

70- i 1 i i r

IOOi MI CROPHONE 4

MICROPHONE 3

90

80

i i 'i MICROPHONE 4

90

80

70

MICROPHONE 6

i i MICROPHONE 6

TIME, SECONDS

i

70* i i i ' i i i * i ' i i i i IOOi MICROPHONE 5 -r- MI CROPHONE 5

I 2 3 4 5 6 7

TIME, SECONDS

Figure 13-8. Truck 13, Test 4, Runs 13,14. (Exterior)

-215-
9<>i

80-

70

Run 15

MlCRC }NE

Run 16

J ' U~*M"*~U****V~—

fa ^ . yv-i..

s:

60-* 1 ' i——»

1 i i i 90n MICROPHONE 2

MICROPHONE 1 ^

80-

70

^^

i i '» MICROPHONE 2

T 1 I I MICROPHONE 5

70-

i i j i i MICROPHONE 5

i i i i i MICROPHONE 6

^

4

TIME, SECONDS

I 2 3

TIME, SECONDS

Figure 13-9. Truck 13, Test 5, Runs 15,16. (Exterior)

-216-
Run 18

u u—u—ii u u u

^*-r MICROPHONE 1 uwflO X>*V y—-V—*—

/>"\ta-» —i*-** Vlt '"^^^t

7TV fLr

60^

Run 17

V—-li—IT—U-~U U MICROPHONE 1 ^^

90i

80-

70

60

MICROPHONE 2

• i ii i MICROPHONE 3

MICROPHONE 2

MICROPHONE 3

90i

TT 1 1 I I I I MICROPHONE 5

90i

80

70-1

60

MICROPHONE 6

^

—r-4

T*

5

-r-6 7

i i i i i .MICROPHONE 6

-T-2 3-r-5

TIME, SECONDS TIME, SECONDS

i i

ii i i

1 i i MICROPHONE 5

6 7

Figure 13-10. Truck 13, Test 5, Runs 17,18. (Exterior)

-217-

Interior

Truck 13

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Open 72 74

(Stationary) 2 Left Closed 72 72

2. Acceleration 3 Right Open 91 93

(Stationary) 4 Right Open 91 94

5 Left Closed 92 91

6 Left Closed 92 91

2. High Idle 3 Right Open 88 87

(Stationary) 4 Right Open 88 86

5 Left Closed 88 86

6 Left Closed 88 87

3. City Start Up* 7 Right Open 91*/89 96*/90

8 Right Open 91*/89 96*/89

9 Left Closed 93*/89 92*/86

10 Left Closed 92*/90 92*/87

4. J366 11 Right Open 91 90

(Acceleration) 12 Right Open 91 91

13 Left Closed 90 88

14 Left Closed 90 88

5. J366 15 Right Open 89 88

(Deceleration) 16 Right Open 88 87

17 Left Closed 88 86

18 Left Closed 90 89

*First number in pair indicates shift noise.

Table 13-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 13.

219-
90i

80-

70-

60J

90i

80--

70-

LEFT EAR

Run 1

» i ' i i Run 2

90

80

100

I

^^

RIGHT EAR

Run 1

,-,..

.

- - —-

- —- -—

- — -- -- —

Run 2

-- —

- -'- - - - -- —

- -

-

Run 3

- — -

.-'.' K

J ^v^*^ i

i ii v-" x^^

,, .-* 1. !*"

• Run 4

A

B f\ „ JW, J ' Pi "" *- "-**-_«>-»« T — - - -

Run 6

.

AiWx^^-—^^:^^^^

/

Run 5

- - - —- .-.__-.

|\ yy

I ^*ta*"^^"W-^-_ ,—w,^-,—

_

J] ^ **" W "~ "Jr *

J/

- --. —-- 12 3 4 5

TIME, SECONDS TIME, SECONDS

Figure 13-11. Truck 13, Tests 1,2, Runs 1-6. (Interior)

6 7

-220-
lOOn

70-fc

LEFT EAR

Run 7 RIGHT EAR

Run 7

2

UJ

IOOt

Run 8 Run 8

Run 9 Run 9

70-*

lOOi

Run 10 Run 10

TIME, SECONDS TIME, SECONDS

Figure 13-12. Truck 13, Test 3, Runs 7-10. (Interior)

-221-
100-i

LEFT EAR

Run 11

RIGHT EAR

Run 11

"»s==;

1001

90

80-

35o

2

UJ

-JQ

Z

3 looCO

90-

80-

70-

Run 12 Run 12

Run 13 Run 13

^

100-r Run 14

2 3

TIME, SECONDS

Run 14

2 3 4 5

TIME, SECONDS

Figure 13-13. Truck 13, Test 4, Runs 11-14. (Interior)

-222-
100-i

90-

80

70-

LEFT EAR

Run 15

RIGHT EAR

Run 15

100

Run 16 Run 16

UJo

3 ioo«

CO 90-

80-

70«

Run 17 Run 17

I0O

90

80+

70

^^

I

Run 18 Run 18

-V"4

-o/\A/V\^

7

TIME, SECONDS

Figure 13-14. Truck 13, Test 5, Runs 15-18,

i i i

' i' 2 3 4 5

TIME, SECONDS

(Interior)

223-

Test Vehicle Number 14

-225-
u

cu6

55

u

•H>

CO

cu Eh

i

cuu

fa

226-
Truck Number : 14

Carrier (owner) : McLean Trucking Company

Company Fleet Number: 1561

Make: White

Model: 7464 TDD

Serial Number: 738769

Year: 1970

Engine Governor Setting: 2225 rpm (no load)

1950 rpm (full load)

Total Miles of Operation: 90,590

Miles Since Last Engine Overhaul: Original engine

Miles Since Any Exhaust Work: Original exhaust system

Engine: Make - Detroit Diesel

Model - 6- 7 IN

•227-
Exterior

Truck 14

TEST RUN SIDE (WINDOWS)

SOUND LEVEL, dB(A)

TM"

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Open -500 rpm 59-69 60-71 60-70 58-68 58-70 67-77

(Stationary) la Right Open -600 rpm 62-64 64-67 63-66 62-64 62-65 69-72

2 Left Closed-500 rpm 60-70 60-70 61-73 60-70 60-70 66-76

2a Left Closed-600 rpm 64 63 66 65 64 70

2. Acceleration 3 Right Open 83 85 84 82 83 90

(Stationary) 4 Right Open 83 86 86 82 84 90

5 Left Closed 82 85 85 84 85 90

6 Left Closed 83 85 86 86 87 91

2. High Idle 3 Right Open 81 82 83 80 80 87

(Stationary) 4 Right Open 80 83 82 79 81 88

5 Left Closed 82 81 82 82 82 88

6 Left Closed 83 81 82 82 82 88

3. City Start Up 7 Right Open 84 83 82 81 82 88

8 Right Open 82 83 84 83 84 89

9 Left Closed 83 83 84 81 82 88

10 Left Closed 83 84 84 83 82 88

4 C J366 11 Right Open 85 85 86 86 85 91 i (Acceleration) 12 Right Open 85 86 86 87 85 92

13 Left Closed 85 86 87 88 86 92

14 Left Closed 86 86 88 89 85 92

5. J366 15 Right Open 83 82 82 81 80 87

(Deceleration) 16 Right Open 82 81 81 80 80 86

17 Left Closed 80 81 82 82 82 87

18 Left Closed 79 81 81 81 82 87

Table 14-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 14.

228-
Run 1 MI CROPHONES

~ 704

m

o 6

UJ>

o

3

50

80

8 70

60

50

80-.

70

60

50

70

604

50

wm

r i i i MICROPHONE 2

Run la

MICROPHONFT

i i MICROPHONE 2

50' ii i 1 ii i * i ii 1 i 80i MICROPHONE 3 - MICROPHONE 3

i i i 1 ii i MI CROPHONE A

» ' i 1 i i 1 • MICROPHONE 5

T 1 II I 1 I MICROPHONIA

T J -X.

^ —i i

1 1 1 r r 80n M4CROPHONE 6

T 1 » 1 T

MICROPHONE 5

S

-i 1 1——i i i 2 3 4 5 6 7

i i i i i 1

' i MICROPHONE 6

T 1 I I 1 I 2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 14-2. Truck 14, Test 1, Runs 1,1a. (Exterior)

-229-
Run 2 80-r

70

60

50

MICROPHONE-+

mmft A AmA A

• i i ii i 8O1 MICROPHONE 2i i

Run 2a MICROPHONgT

!*r'-»,'*7r»W9**vr5vy5wy*,r« •VHvwi^pr

70-

60

*»

50 ' i i 1 r 'i

80i MICROPHONE 3

i i

' i

1 i i i MICROPHONE 2

~ 70-

<

m° 604

uiu 50

Q

Z

oif)

I I I II I 80! MICROPHONE 4

i ii 1 i

1 1 MICROPHONE 3

«*<• %> i HVv^-v

Q 70

60

50

80i

70

60

—i

1 1 r MICROPHONE 5

i i 1 ' i r- — MICROPHONE 4

T 1 J I T

MICROPHONE £

50 *' i i i i i ' i "iii..

80-1 MICROPHONE 6 -. MICROPHONE 6

70

60-

50 i i i i i i 2 3 4 5 6 7

*^*w^^ wvmmm ^i » i i t^p^^* ww "'* nn* ""^ **»*' p*' "

I I I I I 12 3 4 5

i i 6 7

TIME, SECONDS TIME, SECONDS

Figure 14-3. Truck 14, Test 1, Runs 2,2a. (Exterior)

-230-
100

90

sa

TO

lOOi

90-

80-

90

< 80

ID

"PJ 70

ui

> 100

UJ

_J§ 90

O

" 80

70

lOOi

90

80

Run 3

MI CROPHONES

Run 4

MCROPHONFT

T^^r

MICROPHONES70 *

' i ' i i ii " KXh MICROPHONE 3

MICROPHONE 4

ft

7 ' 'i 100

TIME, SECONDS

i i i > MICROPHONE 5

i • i MICROPHONE 6

MICROPHONE 2

MICROPHONE 3

i i' i i MICROPHONE 4

i i i i MICROPHONE 5

i i i ' i MICROPHONE 6

r s

4

i i5

TIME, SECONDS

6

Figure 14-4. Truck 14, Test 2, Runs 3,4. (Exterior)

-231-
Run 5 100

90

80

MICROPHONES

r-*^^^

70

lOOi

90-

iii ii

Run 6

MICKOPHONFT

MICROPHONE 2

OCh

90

< 80

CD

"O_r 70

iii > 100

111

MICROPHONE 3

3O

CO

90

80

70

-i——i 1 i ? i i MICROPHONE 4

MICROPHONE 3

m

"Vv7

m

lOOi

90

80

—i i i ii > M4CROPHONE 5

MICROPHONE 4

^

70-"-^—

100

90-

80-

70

i i i i MICROPHONE 6

£

i i ' i i——r- 2 3 4 5 6

1

7

MICROPHONE &

TIME, SECONDS

Figure 14-5. Truck 14, Test 2, Runs 5,6,

-232-

(Exterior)

i ii i i i i MICROPHONE 2

i i i

" i ' i i

j i i i i MICROPHONE 5

I 2 3 4 5 6 7

TIME, SECONDS
o

O

CO

-I 1 I MICROPHONE 4

° 80

i i r MICROPHONE 4

60* i i i i i i i 90T MICROPHONE 5

ii i i

1 i i MICROPHONE 5

r2

=Z±:

^Z=

90-t

80-

70-

60

MICROPHONE 6

^'- "\J

^

I I I I " | T ' " "'

I

1 2 3 4 5 6 7

—i i i MICROPHONE 6

i i ^s

i i •

1 1 1 1

I 2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 14-6. Truck 14, Test 3, Runs 7,8. (Exterior)

-233-
I I—' I I I I I MICROPHONE 2

60

90i

COo

_r

>

3O

to

80

70H

i 1 1 1 MICROPHONE 3

ii i i ii i MICROPHONE 2

y^A

^

^^

£

^- S

MICROPHONE 3

^^

60* ii i i i ii

90i MICROPHONE 4

80 ^ts.

i i i i i MICROPHONE 4

70- Z± £

60

90i

80

70

i i MICROPHONE 5

• i i

60J 1 1 r I i i

-1 ' i " » I MICROPHONE 5

i i i

Ti

^

^£

MICROPHONE 6

i i i i • i i MICROPHONE 6

S TL

~£

TIME, SECONDS

i i i i

I 2 3 4 5 6 7

TIME, SECONDS

Figure 14-7. Truck 14. Test 3, Runs 9,10. (Exterior)

-234-
Run 11

i/y\ tf" u**~u-—u~-*w—v ' u Run 12

U Lf~~V~V~1/~~U w

90-

80

MICROPHONE 1

70

IOOi

MI CROPHONE 1

90-

80

MICROPHONE 2

70

KXh

90

<

CD 80

J 70

ui> 100

1U

» i i i MICROPHONE 3

__JAiCROPHONE 2

f\S^~-

MICROPHONE 3

3OCO

90

80

MICROPHONE 4

-zi

70

I00i -MICROPHONE 5

MICROPHONE 4

MICROPHONE 5

2 3 4 5

TIME, SECONDS

12 3 4 5

TIME, SECONDS

Figure 14-8. Truck 14, Test 4, Runs 11,12,

-235-

(Exterior)
lOOn

90

80

Run 13

MICROPHONE 1

zz

y^.

70

I00i MICROPHONE 2

Run 14

MICROPHONE 1 /v

OOi

90-

<

m

80

J 70

> 100

UJo

z

O

CO

90

80

MICROPHONE 4

7QJ • 1-^ 1- -r

lOOi

90

80

MICROPHONE 5

r*rJ*~

TIME, SECONDS

MICROPHONE 2

i ii • MICROPHONE 3

i i i

MICROPHONE 3

• i i»

i i

MICROPHONE 4

70"1

1 i "

i ii i ' ' i i lOOn MICROPHONE 6

' i

» i

i

i !

MICROPHONE 5

i i

' i i i i i ' i MICROPHONE 6

I » ' i i 2 3 4 5 6 7

TIME, SECONDS

Figure 14-9. Truck 14, Test 4, Runs 13,14. (Exterior)

-236-
Run 15

KX)

90

80

70

-MICROPHONE 1

lOOi

90-

SO

MICROPHONE 2

70

KXh

90

< 80

m

_r 70

ui

> lOOi

ui

3O

90

i t i i i MICROPHONE 4

90- ^»>

IOOt

90

80

MICROPHONE 5

i i 1 ii—< i MICROPHONE 6

4

-r-5

Run 16

MI CROPHONE 1

MICROPHONE 3

MICROPHONE 2

^=^c

MICROPHONE 3

70* i i i i 1 i i

.MICROPHONE 4

zz. .A^..—/V^v

6

1

7

2

zs:

TIME, SECONDS

i i ' » i » 12 3 4 5

TIME, SECONDS

-«

1

« I I M » |

MICROPHONE 5

't i' ' i i 'i 'i > — MICROPHONE 6

" » 6 7

Figure 14-10, Truck 14, Test 5, Runs 15,16,

-237-

(Exterior)
Run 17 Run 18

KX)-

90

iMJCSQPHONE 1

8a

TO1 IOOi MICROPHONE 2

90-

701

100-

90-

< 80t

_T 70J

iij > IOOi

3

o

CO

90

80- .—/\/- ' ^V^7

70^

I00r

90-

80«

70-

IOOi

ii i i MICROPHONE 5

^s:

TIME, SECONDS

MICROPHONE 1

-^"*V^— n \j *j

I *

I ' 1 ' I II » MICROPHONE 3

MICROPHONE 2

i " i

1 i

" i i ii

MICROPHONE 4

— ' i i i ' i MICROPHONE 3

SZ - -A

i i ' i ' i MICROPHONE 4

—i i—i—' i DPHONE 6

i ' 1 i i MICROPHONE 5

:s:

iiii i i i MICROPHONE 6

i ' i ' i r- 12 3 4 5

TIME, SECONDS

• > i 6 7

Figure 14-11, Truck 14, Test 5, Runs 17,18. (Exterior)

-238-
Interior

Truck 14

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle

(Stationary)

1la

22a

Right

Right

Left

Left

Open-500 rpm

Open- 600 rpm

Closed-500 rpm

Closed-600 rpm

74-65

70-67

73-65

68

72-65

70-66

73-65

69

2. Acceleration

(Stationary)

3

4

56

Right

Right

Left

Left

Open

Open

Closed

Closed

88

88

88

87

88

87

89

88

2. High Idle

(Stationary)

3

4

5

6

Right

Right

Left

Left

Open

Open

Closed

Closed

88

87

87

88

87

87

87

87

3. City Start Up 78

9

10

Right

Right

Left

Left

Open

Open

Closed

Closed

87

86

86

85

88

86

86

86

4. J366

(Acceleration)

11

12

13

14

Right

Right

Left

Left

Open

Open

Closed

Closed

88

88

88

88

87

88

87

87

5. J366

(Deceleration)

15

16

17

18

Right

Right

Left

Left

Open

Open

Closed

Closed

87

87

87

86

88

86

86

86

Cable 14-2. Maximum

microphc

A-wei

me lo

ghted sour cations fc

Ld levels as measui

>r all test runs f<

-239-

red at the

?r vehicle

two interior

number 14

.
LEFT EAR

Run 1

90

Run 2a

80-

70

60 T6

TIME, SECONDS

RIGHT EAR

Run 1

T 1 I I 1 I Run 2 —

tJTt\ ft A n AAA A A A A A A A A A

§¥\l\tS&M^m/Wt

i > i

TIME, SECONDS

Figure 14-12. Truck 14, Test 1, Runs l-2a. (Interior).

-240-
100-i

LEFT EAR

Run 3 RIGHT EAR

Run 3

1007

90

80

< 70-

CDo

Run 4 Run 4

UJ

-Io

8 loo90<

80

70-

Run 5 Run 5

3\r—-

: ^2/

I0O

Run 6 Run 6

TIME, SECONDS TIME, SECONDS

Figure 14-13. Truck 14, Test 2, Runs 3-6. (Interior)

-241-
00

LEFT EAR

Run 7 RIGHT EAR

Run 7

Run 8 Run 8

^^

UJ

_j

o Run 9 Run 9

100-t Run 10

4

Run 10

TIME, SECONDS

Figure 14-14. Truck 14, Test 3, Runs 7-10. (Interior)

-242-

2 3 4 5

TIME, SECONDS
100 -i

LEFT EAR

Run 11

^nZ^

RIGHT EAR

Run 11

Run 12

100-

90

80-

5

70"

Run 12

2

UJ Run 13 Run 13

Run 14

100-r Run 14

TIME, SECONDS TIME, SECONDS

Figure 14-15. Truck 14, Test 4, Runs 11-14. (Interior)

-243-
100n

90-

80

70-

LEFT EAR

Run 15

•&*— •

RIGHT EAR

Run 15

Run 16 Run 16

m

2UJ

3 100-r

Run 17 Run 17

IOOt

Run 18

I

Run 18

4

TIME, SECONDS

Figure 14-16. Truck 14, Test 5, Runs 15-18. (Interior)

-244-

2 3 4 5

TIME, SECONDS
Test Vehicle Number 15

•245-
LO

CDE

o

•HrC

CD >

CO

0)

CD

i-i 60

•246-
Truck Number : 15

Carrier (owner) : McLean Trucking Company

Company Fleet Number: 512

Make: White

Model: 7464 TDB

Serial Number: 730469

Year: 1970

Engine Governor Setting: 2250 rpm (no load)

2100 rpm (full load)

Total Miles of Operation: 222,217

Miles Since Last Engine Overhaul: Original engine

Miles Since Any Exhaust Work: Original exhaust system

Engine : Make - Cummins

Model - NH230-A

247-
Exterior

Truck 15

TEST RUN SIDE (WINDOWS )

SOUND LEVEL, dB(A)

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Open 66 67 68 68 66 74

(Stationary) 2 Left Closed 66 67 68 67 66 74

2. Acceleration 3 Right Open 84 85 86 84 84 92

(Stationary) 4 Right Open 84 85 86 85 83 92

5 Left Closed 83 84 85 85 84 91

6 Left Closed 84 84 85 86 85 91

2. High Idle 3 Right Open 83 85 86 84 84 91

(Stationary) 4 Right Open 83 84 86 84 83 91

5 Left Closed 83 84 85 84 84 91

6 Left Closed 83 84 85 84 84 91

3. City Start Up* 7 Right Open 85 86 85 85 85 92

8 Right Open 8M 84 85 85 85 3^0

9 Left Closed 8M 86 89 87 3% 9<0

10 Left Closed 86 86 86 86 85 90

4. J366 11 Right Open 86 87 87 86 87 93

(Acceleration) 12 Right Open 86 86 87 86 \ 88 92

13 Left Closed 88 86 87 86 86 92

14 Left Closed 88 86 87 86 86 92

5. J366 15 Right Open 82 84 86 85 83 89

(Deceleration) 16 Right Open 82 83 85 84 83 89

17 Left Closed 83 84 85 84 85 90

18, Left Closed 83 85 86 85 85 91

"First number in pair indicates shift noise.

Table 15-1. Maximum A -weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 15.

248-
Run 2 Run 1 80i

70

604

50

80

^^j^^,A n. v vV'. -y-^i^V^WW^'X^^

I I I MICROPHONES

*W- y v--lf\i\fy, . /-^ , r^A-»». ,

~ 70-f

<

CDo 604

V^Aj-^v^Ary^^yVV^vVV^VvVv-^A, ^^

111 ^ 50

i i i i i i * i

1 1 1

-» 1 MICROPHONE 3 t— MICROPHONE 3

80i

S 70

60

50-

80

i i

1 1 r MICROPHONE-^

t 1 r

—t 1 1 —i- MICROPHONE 4

T 1

1

70

604

MICRO!

50

80-

70

MICROPHONE 5

^vvyv^yvvv^vvv^.^.yvwvwf

60-

50

MICROPHONES

T"

2 3 4 5

TIME, SECONDS

-i-6 7

T 1 1 1 MICROPHONE 6

T"

4

TIME, SECONDS

Figure 15-2. Truck 15, Test 1, Runs 1,2. (Exterior)

-249-

i i 6 7
90-

80

7Q

I00i

UJ> 100

UJ

3O

CO

90

80

70

100

90

80-

70

100

Run 4

— ii i ' i MICROPHONE 3

i i i

' MI CROPHONE Ar

i i i i MICROPHONE 5

w

90

804

70

i i i i i MICROPHONE 6

-i-4

TIME, SECONDS

-i7

Run 3

; — MICROPHONF 1

,. ^y^-*^~- = ic—s= r

rJ

i ~~J

^

I I I 111

MICROPHONE 3

i i i t MICROPHONE 4

MICROPHONE 5

MICROPHONE 6

i i »i 12 3 4 5

TIME, SECONDS

-tr 6

Figure 15-3. Truck 15, Test 2, Runs 3,4. (Exterior)

-250-
100-K

Run 5

OPHQNg

7QJ-! , -_, , ,

Run 6

MI CROPHONES

IOCH

90\

80

MI CROPHONES

90-

< 80

ID

UJ> 100

UJ

3OCO

90

80-

70

MICROPHONE 4

i

2S =^ '—

lOOn

90

804

70-

100

90

MICROPHONE 5

80

70

MICROPHONE 6

i i 12 3 4 5

TIME, SECONDS

70" 'i ' i ' i i I00n MICROPHONE 3

MICROPHONE 2

Z=^r i i i t » i MICROPHONE 3

» i i i »i i MICROPHONE 4

-y»—M «#^^

J

I I ' I MICROPHONE 5

i 'i i i ' 'i . . MICROPHONE 6

I 2 3 4 5 6 7

TIME, SECONDS

Figure 15-4. Truck 15, Test 2, Runs 5,6. (Exterior)

-251-
90-

m

ui

>

_i

Q

Z

OCO

80

70

100

Z^L

2

^:

|Z=

90

80

70

MICROPHONE 4

=^= rs:

^

MICROPHONE 4

2!

IOOi MI CROPHONE-^

i

1 i

' 'i ' i ' ' 1 MICROPHONES

• i i MICRQPHONE6

i ' " I i i " i MICROPHONE 6

±S

£

TIME, SECONDS

2 3 4 5 6

TIME, SECONDS

Figure 15-5. Truck 15, Test 3, Runs 7,8. (Exterior)

-252-
I » I III

MICROPHONE 3

90-

80

CD

_r 7o

ui

> 100

t&J

31

^

90

I " ' 1 1 I ! T

MI CROPHONE 4

MICROPHONE 3

2^:

» i i i i . i

. i i I MICROPHONE 4

3O

C/> 80 zz_ ^^^

90

80

'•" • i • MICROPHONE 5

=^2=

70

100

904

80

70

I

' r i i | i | MICROPHONES

i f i i i i i ^UCRQPtiONE 6

I

zZl

I? i i i t i

I 2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 15-6. Truck 15, Test 3, Runs 9,10. (Exterior)

-253-
Run 11

IQQ.JJ _

u U » l/*"~U u Run 12

U U U M ' V

90

SO

TO

lOOi

MICROPHONE 1

90

80-

90-

< 80

m

o

_r 70

UJ> 100

UJ

3OCO

90

8Q70

lOOi

100

90

80-f

70

MICROPHONE 1

MICROPHONE 2

70' i ill 1 i

1 lOOi MICROPHONE 3

MI CROPHONE 4

MICROPHONE 5

i i i ii

MICROPHONE 6

=S

4

TIME, SECONDS

MICROPHONE 2

MICROPHONE 3

MICROPHONE 4

i i * i

' 'i i i MICROPHONE 5

.j—*

^

7

MICROPHONE 6

=\

12 3 4 5

TIME, SECONDS

• i 6 7

Figure 15-7. Truck 15, Test 4, Runs 11,12. (Exterior)

-254-
KX)

Run 13

90

80

MICROPHONE 1

70

lOOt

90

80^

MICROPHONE 2

70

KXh

' i

90-

< 80

m

•oJ" 70

UJ> 100

i i MICROPHONE 3

i

' t

o

z

DO

90

80

70

MICROPHONE 4

21

lOOn

90

80-

MICROPHONE 5

70J 1 r 100

90

80-F

70

^

i » i i ' ' i

i i i i

—,—i—i' "

i

» '" I MICROPHONE 6

Run 14

u u u u >y-*~u it MI CROPHONE 1

ii i i MICROPHONF 2

MICROPHONF 3

:z

i » i MICROPHONE 4

*— i i

' j i i -MICROPHONE 5

T 1 1' I " I I 2 3 4 5 6 7

i ii i ii i -MICROPHONE 6

i i

' i '

' i t

TIME, SECONDS

I 2 3 4 5 6 7

TIME, SECONDS

Figure 15-8. Truck 15, Test 4, Runs 13,14. (Exterior)

-255-
Run 15

IAQ J u-*w• • v-—U" V u

90

80

MI CROPHON E 1

3

7TH » •

lOOt

90

80

MICROPHONE 2

-\A--s. ^"^

70

lOCh

90

< 80

m

_r 70

UJ> lOOi

UJ

=fc

3

o

90

80

70

i

1 'i i i MICROPHONE 4

^^'~x

^

lOOi

90

80

70-1 1 » 100

90

80

70 -T- 4

TIME, SECONDS

Run 16

J U U V/* ~*V—

I II

MI CROPHONE 1

,^j'~*^-^**—

y

! I I I I "I

MICROPHONE 3

i • i'

___ MICROPHONE 2

i i i »

MICROPHONE 3

i i i » i ' i AAirPOPHONF S

I i n MICROPHONE 4

'i t —i—

MICROPHONE 6 —- MICROPHONE 6

12 3 4 5

TIME, SECONDS

i n

• i

MICROPHONE 5

ii t

Figure 15-9. Truck 15, Test 5, Runs 15,16, (Exterior)

-256-
KX)

90

Run 17

80

MICROPHONE 1

70

IOOi

90

80

MICROPHONE 2

70J r KXh MICROPHONE 3

90-

< 804

m

J 70

UJ> 100 MICROPHONE 4

IOOi

90

i

1 ' i MICROPHONE 5

Run 18

u u u u u u u MI CROPHONE 1

i » i i i dCROPHONE 2

:^=

90

80

70

3&~

4

-r-5

TIME, SECONDS

70 1 ii i i

•

1 IOOt MICROPHONE 6

7

MICROPHONE 3

ZLs:

i * « i i'ii

MICROPHONE 4

MICROPHONE 5

i i i i i i ii

MICROPHONE 6

TIME, SECONDS

6 7

Figure 15-10, Truck 15, Test 5, Runs 17,18,

-257-

(Exterior)

Interior

Truck 15

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Open 71 75

(Stationary) 2 Left Closed 71 75

2. Acceleration 3 Right Open 90 90

(Stationary) 4 Right Open 90 90

5 Left Closed 90 91

6 Left Closed 91 91

2. High Idle 3 Right Open 89 90

(Stationary) 4 Right Open 88 90

5 Left Closed 89 90

6 Left Closed 89 90

3. City Start Up 7 Right Open 90 91

8 Right Open 88 92

9 Left Closed 88 92

10 Left Closed 90 92

4. J366 11 Right Open 90 91

(Acceleration) 12 Right Open 91 92

13 Left Closed 90 92

14 Left Closed 92 92

5. J366 15 Right Open 90 89

(Deceleration) 16 Right Open 90 88

17 Left Closed 91 90

18 Left Closed 91 90

Table 15-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 15.

-259-
LEFT EAR

Run 1 90

80-

60

90

70-—^**- > — ,-».-<»«ri >.^Vv,^> y^ , ,. v —» yy

| UU . HI

» " I Run 2

i ' i

RIGHT EAR

Run 1

1

i^*nryv,vwaw^v^fv»?%^vv^ _

i . , ——j

1 i

• 1 » Run 2

80

70" |M*^ - **—%?*%*-* * r^mm^>mj'r*rA*<~m^h ^*im *

Run 3

• Run 4

z 90

O

80

»— P ^p -^j l«M^^_p«

2 3 4 5

TIME, SECONDS TIME, SECONDS

Figure 15-11. Truck 15, Tests 1,2, Runs 1-6. (Interior)

260-
IOO-i

LEFT EAR

Run 7 RIGHT EAR

Run 7

IOOt

Run 8 Run 8

UJQ Run 9 Run 9

IOOi

Run 10

I 2 3 4 5

TIME, SECONDS

Run 10

3 4

TIME, SECONDS

Figure 15-12. Truck 15, Test 3, Runs 7-10. (Interior)

-261-
lOO-i

LEFT EAR

Run 11

RIGHT EAR

Run 11

IOOt

2UJ

3 ioon

c/> 90

80-

70-

Run 12 Run 12

Run 13 Run 13

^py/^/V>,'^fy,^-^y^W -W*"*

100-t

Run 14 Run 14

TIME, SECONDS

12 3 4 5

TIME, SECONDS

Figure 15-13. Truck 15, Test 4, Runs 11-14. (Interior)

-262-
LEFT EAR

Run 15

RIGHT EAR

Run 15

100-r

90-

80«

3

7C>

CD

2UJ

Run 16 Run 16

Run 17

100-r Run 18 Run 18

TIME, SECONDS

Figure 15-14. Truck 15, Test 5, Runs 15-18

-263-

TiME, SECONDS

(Interior)

Test Vehicle Number 16

-265-
u

CDa

o

1-1 >

4-1 CO

0) Eh

i

cu

60

-266-
Truck Number: 16

Carrier (owner) : McLean Trucking Company

Company Fleet Number: 10434

Make : Dodge

Model: C-700

Serial Number: M71FYIT- 301559

Year: 1971

Engine Governor Setting: 3600 rpm (no load)

3200 rpm (full load)

Total Miles of Operation: 28,256

Miles Since Last Engine Overhaul: Original engine

Miles Since Any Exhaust Work: Original exhaust system

Engine: Make - Crysler Corp. -Truck premium

Model - 361-3 CID

267-
Exterior

Truck 16

TEST RUN SIDE (WINDOWS)

SOUND LEVEL, dB(A)

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Open 48 49 49 50 49 55

(Stationary) 2 Left Closed 48 \ 49 I 50 50 50 56

2. Acceleration 3 Right Open 77 78 78 79 77 85

(Stationary) 4 Right Open 77 78 78 79 77 84

5 Left Closed 76 76 76 78 76 83

6 Left Closed 76 76 76 78 75 83

2. High Idle 3 Right Open 75 74 75 76 75 82

(Stationary) 4 Right Open 74 74 75 76 75 82

5 Left Closed 75 74 74 76 74 81

6 Left Closed 74 74 74 75 74 80

3. City Start Up 7 Right Open 78 79 78 78 76 83

8 Right Open 79 80 78 79 77 83

9 Left Closed 75 76 76 78 77 82

10 Left Closed 76 77 76 78 78 83

4. J366 11 Right Open 81 81 80 82 81 86

(Acceleration) 12 Right Open 80 81 81 82 81 86

13 Left Closed 78 79 79 80 79 85

14 Left Closed 78 79 79 82 81 85

5. J366 15 Right Open 78 78 77 78 77 82

(Deceleration) 16 Right Open 77 78 76 78 76 82

17 Left Closed 76 76 77 78 77 82

18 Left Closed 75 ____76 76 78 77 82

,

Table 16-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 16.

-268-
70!

60

5a

40

Run 2 MI CROPHONE^

70n

60

50-

40

i ii |

i MICROPHONE 2

70i

60-

_r

50-

Ul>

UJ 40

_l 70-

o

z

3

o 60-

T 1 I I I MICROPHONE 3

50

40

—

i

• 1 r MICROPHONE 4-

^^^ , j> .-<>, _^.

70

60

50-

40

-i 1 1 1 r MICROPHONE 5

70n

60

50-1

40

i i I i i MICROPHONE T~

2 3 4 5

TIME, SECONDS

Run 1 MICROPHONE

—i 1 1 1 MICROPHONE 2

i i I • i MICROPHONE 3

^•syVr-vx^-w^*—A,v* y^'inVwyi

I I | I I MICROPHONE ±

i i 1 i MICROPHONE 5

ii i i i MI CROPHONE S

-r*

I 2 3 4

TIME, SECONDS

6

Figure 16-2. Truck 16, Test 1, Runs 1,2.

-269-

(Exterior)
9Ch

80-

70-

Run 3

MOOPHOHFP

Run 4

60' i 1 i i i i i 90i MICROPHONE 2

fiO ^-v

_y *~** " - - - »——

7n. r f U" t

jf

60^ I

i i 1 i

1 9Ch

o

8 80

60

90-i

MICROPHONE -MICROPHONE 3

i i i i MICROPHONE 4

i i i i i i t MICROPHONES

l I

!—i r MICROPHONE 5

t i i -IONE6

TIME, SECONDS

3 4 5

TIME, SECONDS

Figure 16-3. Truck 16, Test 2, Runs 3,4. (Exterior)

-270-
90i

Run 6

nniv»ivv^r MlCROPHnNF 1 • %••" l. i f¥Y \^j

s* "*—^-»-»- J*

u-\—,- *_~ " '— - 7f\. f\r s

1J

(

I 6()J t

90i

Q

907

8 80

70

60

90i

MICROPHONE 2

MICROPHONE 4

—i i i i i i MICROPHONE 5

Run 5

MOOPHORFT

I

MICROPHONE 2

3P

MICROPHONE 3

£

i i i i i ' MICROPHONE 6

2 3 4 5 6

TIME, SECONDS

-rI 2 3 4

TIME, SECONDS

-i 1

i i 1 1 i i MICROPHONE 4

ii j i i MICROPHONE 5

7

Figure 16-4. Truck 16, Test 2, Runs 5,6. (Exterior)

-271-
90t

S 80

MICROPHONE 4

i MICROPHONE 4

70

ZXL m

s 2

Z!

TIME, SECONDS TIME, SECONDS

Figure 16-5. Truck 16, Test 3, Runs 7,8. (Exterior)

-272-
Run 9

MICROPHONE 2

—i i i

1 MICROPHONE 3

i i MICRQEHQNE 2

i • ' • 1 i i 1 MICROPHONE 3

TIME, SECONDS

12 3 4 5

TIME, SECONDS

Figure 16-6. Truck 16, Test 3, Runs 9,10. (Exterior)

-273-
90-

80-

70-

60-

90-

80-

70-

60-1 90

80-

70

60

90i

80-

70-

60-

901

80-

70-

60-

90-

80-

70-

60-

Run 11 Run 12

. Pnlx^lxV^r AAironPHDNF 1 MICROPHONF 1 1 IV^I " L i

j-^-*"^*^1 "w* "^^^-w^ ^_/—*"' M* W^L -. ^^s»^^ ^

^*v_«^

^*^

f - I MICROPHONE 2 MICROPHONE 2

i

_s—^ _s *_*_-^ n-r~f~ ^-n*-*3-^^—^ j-S ^~ X^

r ^ "V

MICROPHONE 3

• • i MICROPHONE 3

i — —

i—

- ^__

i

< ^s""**- "^^v^. —^*— ***~ -"^

f^ \ r^

m

i >

_J MICROPHONE 4

• i i MICROPHONE 4

• i Q

z

IDO __^^>r-r* "V^ ^ rW ^"^" "*—

"~s*—w- CO ^

*~* *** ~S"

-r~

l i i MICROPHONE 5

i MICROPHONE 5

¥ """

1

i ,, r~^ —

.

__s-~*—<r= ——^=*

A _^r*~*

1 ., . r ,

-, p—

MICROPHONE 6

• i j 1

1 i

1

MICROPHONE 6

1 1

^^_

^,/"^'*^*r^'^

vX

~*-*^~^'

*k ** s^_^ y^* ^*-^_ s

j**^ *"* jT* —

1 » • 1 12 3 4 5

TIME, SECONDS

6 7 1 2 3 4 5

TIME, SECONDS

6 7

Figure 16-7. Truck 16, Test 4, Runs 11,12 (Exterior)

-274-
90n

80

Run 14

!/ u u \r~~v \i " 'u

Run 13

J U 1/ L> U U U

70

MI CROPHONE 1

gQj , 1 . t r

MI CROPHONE 1

90i

80

704

MICROPHONE 2 —i 1 • « MICROPHONE 2

MICROPHONE 3

90n

<n 80

70

MICROPHONE 4

^^

i

1 r MICROPHONE 4

^

i i 1 1 • MICROPHONE 5

TIME, SECONDS TIME, SECONDS

Figure 16-8. Truck 16, Test 4, Runs 13,14. (Exterior)

-275-
90T

80-

70

i i i MICROPHONE 2

60

90i MICROPHONE 3

Q

-z. 3O

60

90i

° 80

70

60

—i i i MI CROPHONE 4

I i I

1 r MKROPHONE 5

80

70-

60

90i MICROPHONE 6

Run 15

mi crophonic;

=^

—i

1 i 1 MICROPHONE 2

MICROPHONE 3

^Vr^vy>

i— 1 1—'—• r MICROPHONE 4

=3^

i i i i » MICROPHONE 5

i i i 1 i i MICROPHONE 6

TIME, SECONDS TIME, SECONDS

-i 1

Figure 16-9. Truck 16, Test 5, Runs 15,16. (Exterior)

-276-
Run 18

V

1/ ' U U U u U

80

70-

MICROPHONE 1

804

70

v:

60

90i

80

m

°

70H

u

5 60

—*

1 I I MICROPHONE 3

i ii i MICROPHONE 4

° 80

70

80

70-

60

90

80

70-

60

MICROPHONE 6

1 2 4

TIME, SECONDS

T6

Run 17

MI CROPHONE 1

=;^^

T 1

1 1 I IT 1- MICROPHONE 2

^<^

T r -i 1

1

» 1

MICROPHONE 3

60* i > i i 1 i i 90-1 MICROPHONE 5

ii i 1 i MICROPHONE 4

-i 1 1 1 1 1 i MICROP+40NE 6

7

TIME, SECONDS

-i 1

i i

1 1 i » • -MICROPHONE 5

-i——i • i

Figure 16-10. Truck 16, Test 5, Runs 17,18. (Exterior)

-277-

Interior

Truck 16

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Open 61 62

(Stationary) 2 Left Closed 61 61

2. Acceleration 3 Right Open 87 87

(Stationary) 4 Right Open 84 86

5 Left Closed 82 83

6 Left Closed 82 87

2. High Idle 3 Right Open 82 82

(Stationary) 4 Right Open 82 82

5 Left Closed 81 81

6 Left Closed 81 81

3. City Start Up 7 Right Open 86 89

8 Right Open 86 90

9 Left Closed 83 85

10 Left Closed 83 85

4. J366 11 Right Open 84 85

(Acceleration) 12 Right Open 84 86

13 Left Closed 84 87

14 Left Closed 84 88

5. J366 15 Right Open 84 83

(Deceleration) 16 Right Open 83 83

17 Left Closed 82 83

18 Left Closed 82 82

Table 16-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 16.

279-
LEFT EAR

Run 1 RIGHT EAR

Run 1 80

70

60

50

A^p~^^^nAVV^^^rvVV•^^ ' vS'*^V\VVW\SNVvi^W'VVVVSI3fr

80t

i » i Run 2

70

50

l00-»

* I

90-

< 80

COo

IOOt

90+

80

70

100

90

80

-i -i T 1

' i 1—'

1 1 Run 2

T-r—rr •

1 i Run 3 Run 3

£§

» I I —

r

• Run 4

§

—**" ' **-—**-"~J*~-^*^«-

-i ' ' ' _—' , i

'

1 Run 6

i i ! » i

. Run 5

y/Ap7,7<^^ft»fy^ fV~**r°*lt~h^%m^

I I I » 1 1 > Run 6

tdtmt ? -g=»gaoafta

70 ' i 1 1 1 1 •

1

I 2 3 4 5 6 7

-^ -"*• _ r "*""i _f** _ "*~~* _

**• " _

***

I 2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 16-11. Truck 16, Tests 1,2, Runs 1-6. (Interior)

•280-
100-i

LEFT EAR

Run 7 RIGHT EAR

Run 7

Run 8

2UJ

IOOt

Run 8

Run 9 Run 9

Run 10

IOO

904

80

70

^^

12 3 4 5

TIME, SECONDS

Run 10

- f\jT^7-

t12i 3

» 4

I ^

5

TIME, SECONDS

^

Figure 16-12. Truck 16, Test 3, Runs 7-10. (Interior)

-281-
LEFT EAR

Run 11

!00<

SOTO80* mu"^

RIGHT EAR

Run 11

00•o

Run 12 Run 12

2

UJ

_i

Q

Z

3 iooen

90-

80-

70-1-

Run 13 Run 13

j*»^-» —

j

—

IOO

904

80

70-*

Run 14

TIME, SECONDS

Run 14

lit iii

2 3 4 5 6 7

. r

fxW\

^^J^V

I I I » »

3 4 5 6 7

TIME, SECONDS

Figure 16-13. Truck 16, Test 4, Runs 11-14. (Interior)

•282-
1 00-*

904.

80

70-1

LEFT EAR

Run 15

RIGHT EAR

Run 15

I00i

90«

~ 70-

Run 16 Run 16

3 ioo-i

90-

80-

70«

Run 17 Run 17

^ ^AA^^**Aa/>^\i<\ j

IOO-i

90

70

i

Run 18

2 3 4"

TIME, SECONDS

Run 18

6 7

Figure 16-14. Truck 16, Test 5, Runs 15-18.

-283-

TIME, SECONDS

(Interior)

Test Vehicle Number 17

-285-
u

e

>

i

013M

•H

-286-
Truck Number: 17

Carrier (owner): Signal Delivery Service, Inc.

Company Fleet Number: 56-070D

Make : Ford

Model: LN9000

Serial Number: R90SVL91650

Year: 1971

Engine Governor Setting: 2250 rpm

Total Miles of Operation: 11,907

Miles Since Last Engine Overhaul: Original engine

Miles Since Any Exhaust Work: Original exhaust system

Engine: Make - Detroit Diesel

Model - 6- 7 IN

-287-
Exterior

Truck 17

TEST RUN SIDE (WINDOWS)

SOUND LEVEL, dB(A)

MICROPHONES

1 2 3 4 5 6

1. Low Idle 1 Right Open 63 62 62 : 63 62 70

(Stationary) 2 Left Closed 62 61 62 63 62 69

2. Acceleration 3 Right Open 87 89 88 87 86 94

(Stationary) 4 Right Open 87 88 88 87 86 94

5 Left Closed 86 88 88 88 87 94

6 Left Closed 86 87 88 88 87 93

2. High Idle 3 Right Open 84 84 84 83 83 91

(Stationary) 4 Right Open 84 84 84 84 83 91

5 Left Closed 81 81 82 82 81 87

6 Left Closed 81 81 81 82 81 87

3. City Start Up 7 Right Open 87 88 87 86 86 92

8 Right Open 86 88 87 87 86 91

9 ! Left Closed 84 84 86 88 87 90

10 Left Closed 82 83 85 88 86 89

4. J366 11 Right Open 86 88 89 90 89 93

(Acceleration) 12 Right Open 87 89 88 88 88 93

13 Left Closed 87 88 90 90 89 94

14 Left Closed 85 88 88 89 90 92

5. J366 15 Right Open 84 84 83 84 82 89

(Deceleration) 16 Right Open 84 84 83 84 82 89

17 Left Closed 80 82 82 83 82 87

18 Left Closed 80 82 82 83 82 87

Table 17-1. Maximum A-weighted sound levels as measured at the six exterior

microphone locations for all test runs for vehicle number 17.

•288-
80i

70-

60-

Run 2 MI CROPHOtsgT

50* i i i

• 1 i i 80i MICROPHONE 2

Run 1 MI CROPHONIA

\vVVvw^uvL%/'^^v^^.'WvVirtVA^7Wt//vy^ wy^/W^/^y

70-

50

80 ^ 70

<

-o 60

w 50

t 1 r- MICROPHONi-3

I •

i ii i i i MICROPHONE 2

n£*B ^"- ^'^^^^^^^-^-i<^'^,^^i »<j

—I 1 I 1 I I I MICROPHONE 4

MICROPHONE 3

BttQ<l«^»i^^<^»<wyy^vWM^>^»iyi>V>i^^ „ i. V»rcv^<V>,

8 704

60

70

60-

50

80

**<>/»AV>**''>'V*'l*'>***i\A*'>'''*^>^^

70

60

50

—i 1

1 i MICROPHONE 6

i i i i r MICROPHONE 5

» »» * <*VWAW^V^*^l W V**VV9 V W*»VW1A^*^*»*''**'**^^^

pwvi^WVV»i#W»\^rttW*w" U" ,w<^>WAA l*WMA*^'*WWt

"T~4

-T- 6

—i 1 1 i MICROPHONE 6

-I—4

TIME, SECONDS TIME, SECONDS

Figure 17-2. Truck 17, Test 1, Runs 1,2,

-289-

(Exterior)
lOOn

Run 3

90

80

MICROPHONE T

±

Run 4

^=^

70 ' ' i i i ii i i * i

i i i i I00i MICROPHONE 2 ,_ MICROPHONES

12 3 4 5

TIME, SECONDS

Figure 17-3. Truck 17, Test 2, Runs 3,4,

-290-

TIME, SECONDS

(Exterior)
lOOn

Run 6

90

80

70

MI CROPHONE

-£^

£

X^

£

Run 5 MI CROPHONE

lOOi

90

70

MICROPHONE 2

80- —

i i

MICROPHONE 2

MICROPHONE 3

< 80

m

o

UJ> 100

UJ

3O(S)

90

80

70

i i i ii

• ' i MICROPHONE 3

lOCh —I I II I I MICROPWON£-£

i i i i t . , MICROPHONE 4

i i ' j

i ' i MI CROPHONE 5

IOOt

II I I II I MICROPHONE 6

TIME, SECONDS

2 3 4 5

TIME, SECONDS

Figure 17-4. Truck 17, Test 2, Runs 5,6. (Exterior)

-291-
KXK

Run 8

"V u u u w Run 7

90

80

70

MI CROPHONE-4-

:£:

-^-~"~

i i ^i

90

80

INE 2

^

z^ 5

-^ 70- 1 . 1 1 r

IOOt MICROPHONE 3

m

^z

I I

MICROPHONE 2

3=^

i % ^ 9t

' 1

90-

< 80

CDo

s:

J* 70

UJ> IOOi

T ' T"

MICROPHONE 3

^

v_a, ^i

I | % ' ' I " ^I ' I

IDO

CO

90

80-

70

MICROPHONE 4

^^ ^

100

i i i 1 i i MI CROPHONE 5

MICROPHONE 4

zt

i ^i > » MICROPHONE 5

IOOi

TIME, SECONDS TIME, SECONDS

Figure 17-5. Truck 17, Test 3, Runs 7,8. (Exterior)

-292-
100

Run 10

—

-v v \r —

v

*~

90

60

70

MI CROPHONE

izi

7* 2 —

r

Run 9

MI CROPHONET

^L.

~2Z

4

lOOi MICROPHONE 2

I I I I

' I ' I MICROPHONE 2

:^:

~^-

% ~r^ r » KXH

90-

< 80

m

_r 70

IaJ > 100

UJ

DO

MICROPHONE 3

T^^

T » <=* MICROPHONE 4

MICROPHONE 3

3=:

_<=_

' ii i i '

' ' 'i' ^~* i '

' ' r MI CROPHONE 4

TIME, SECONDS TIME, SECONDS

Figure 17-6. Truck 17, Test 3, Runs 9,10. (Exterior)

-293-
100-

90 :

Run 12

-U U U U U \ Run 11 —n/——tr ' v - -w~"y—y**~%

MI CROPHONE 1 z s

70J

lOOi

MI CROPHONE 1

MICROPHONE 2

9a

80--

70J

KXHMICROPHONE 2

MICROPHONE 3

<

m

>

UJ

_i

o

z

z>o

(0

90-

80-

-X

ZZL

70J

lOOi

90

80-

i i i i i — MI CROPHONE 4

MICROPHONE 3

==/=-

70J

MICROPHONE 4

^:

I00i MICROPHONE 5 MICROPHONE 5

100

i

i i i r MICROPHONE 6 MICROPHONE 6

2 3 4 5

TIME, SECONDS TIME, SECONDS

Figure 17-7. Truck 17, Test 4, Runs 11,12,

-294-

(Exterlor)
IOOi

90

804

Run 14

If u U W ' "V If u MI CROPHONE 1

:wNc

~£L 70

IOOt

90-

80

MICROPHONE 2

70- 1 n? ii i

'

OOi MICROPHONE 3

CD

904

80

70

-3^- £

UJ> 100

UJ

o

90

80

70

100

90

i i i i MICROPHONE 4

X^

±s:

80 -"C

Run 13

u u——w—-v MI CROPHONE 1

" i ' ' r

1 MICROPHONE 2

^-

MICROPHONE 3

S ^

' i i i i i i MICROPHONE 5

» i i

i . 1 11 1 n i i MICROPHONE 4

-7- ^v

I I I J —

I

1 I • • MICROPHONE 5

70' 1 1 1 1 1 •

1 ' 11 1 • • IOOt MICROPHONE 6 - MI CROPHONE 6

90

80-

70 -1——

1

1 t 3 4 5 6

TIME, SECONDS

2 3 4 5

TIME, SECONDS

Figure 17-8. Truck 17, Test 4, Runs 13,14. (Exterior)

-295-
IOO-i

90

80

70

Run 15

J——\l ' U I/—V—IT- \

Run 16

MICROPHONE 1 ^

v—V—-V MI CROPHONE 1

lOOi

90

80

MICROPHONE 2

70

lOOi MICROPHONE 3

MICROPHONE 2

O

90

80

i ii i i MICROPHONE 4

MICROPHONE 3

^^

70

lOOi

90

—i 1 i ' i MICROPHONE 5

•—

M

i

I CROPHO

»

NE 4

zz^

i i ' i i i MICROPHONE 5

70-1 1 100ii i • i MICROPHONE 6

i i ill i MICROPHONE 6

TIME, SECONDS

I 2 3 4 5 6 7

TIME, SECONDS

Figure 17-9. Truck 17, Test 5, Runs 15,16. (Exterior)

-296-
100

90

Run 17

MICROPHONE 1

80

Run 18

U K~~l/"V—-VI V U MICROPHONE 1

7t>

lOOv

90-

SO

MICROPHONE 2

^^

70

KXh

MICROPHONE 2

s:

90

< 80

m

J 70

UJ> 100

UJ

_i

§ 90

O

*

80

MICROPHONE 3

^^=

7Q

—i iii i MICROPHONE 4

MICROPHONE 3

=Z^

-^JTT s

lOOi

—i 1 i ' ' i i MICROPHONE 5

i i ' i .MICROPHONE 4

:X

MICROPHONE 5

lOOi

TIME, SECONDS TIME, SECONDS

Figure 17-10. Truck 17, Test 5, Runs 17,18. (Exterior)

-297-

Interior

Truck 17

TEST RUN (SIDE) WINDOWS

SOUND LEVEL, dB(A)

MICROPHONES

LEFT EAR RIGHT EAR

1. Low Idle 1 Right Open 68 69

(Stationary) 2 Left Closed 67 67

2. Acceleration 3 Right Open 92 92

(Stationary) 4 Right Open 91 92

5 Left Closed 87 87

6 Left Closed 88 88-85

2. High Idle 3 Right Open 89 89

(Stationary) 4 Right Open 88 89

5 Left Closed 86 88

6 Left Closed 86 88

3. City Start Up 7 Right Open 93 92

8 Right Open 93 92

9 Left Closed 89 87

10 Left Closed 90 88

4. J366 11 Right Open 92 92

(Acceleration) 12 Right Open 93 93

13 Left Closed 88 89

14 Left Closed 88 89

5. J366 15 Right Open 91 90

(Deceleration) 16 Right Open 91 90

17 Left Closed 86 88

18 Left Closed 86 88

Table 17-2. Maximum A-weighted sound levels as measured at the two interior

microphone locations for all test runs for vehicle number 17.

-299-
LEFT EAR

Run 1 90i

80-

70-

60J 90i

80-

70--

60J lOOi

90-

< 80-

m

_r 70^

UJ> IOOto

90-

80

904

80

70-

Run 2

i i

» i. r Run 4

RIGHT EAR

Run 1

^*^^» i ij- Q g »* »y " fc. **v<%^oAA ggg

i

i Run 2

RuTl ' P

i

1 i Run 5

i i i i t I

I 2 3 4 5 6 7 6 7

TIME, SECONDS TIME, SECONDS

Figure 17-11. Truck 17, Tests 1,2, Runs 1-6. (Interior)

•300-
LEFT EAR

Run 7 RIGHT EAR

Run 7

Run 8 Run 8

o

z

8 ioo«

90-

80-

70-

Run 9 ^S

Run 9

IOOt

904

80

70

Run 10

4

^

6

Run 10

TIME, SECONDS

Figure 17-12. Truck 17, Test 3, Runs 7-10. (Interior)

-301-

2 3 4

TIME, SECONDS
100-i

90

80'

70-

LEFT EAR

Run 11

RIGHT EAR

Run 11

Run 12 Run 12

zr^

Run 13

I00i

Run 14 Run 14

lit i i i i

I 2 3 4 5 6 7

TIME, SECONDS TIME, SECONDS

Figure 17-13. Truck 17, Test 4, Runs 11-14. (Interior)

302-
100

LEFT EAR

Run 15

RIGHT EAR

Run 15

Run 16 Run 16

Run 17 Run 17

100

Run 18

2 3 4 5

TIME, SECONDS

Run 18

T"

4

i i 5 6

TIME, SECONDS

Figure 17-14. Truck 17, Test 5, Runs 15-18. (Interior)

303-
Acknow ledgement

The authors recognize the significant contributions made by the

following organizations which have greatly aided this research

program: the American Trucking Associations, Wallops Station (NASA),

United Parcel Service, Yellow Freight System, Inc., Halls Motor Transit,

Burlington Industries, Inc., Associated Transport, Inc., Chemical

Leaman Tank Lines, Inc., Safeway Stores, Inc., Anchor Motor Freight,

Inc., McLean Trucking Company, and Signal Delivery Service, Inc.

The authors also express appreciation to the following members

of the Applied Acoustics and Illumination Section: D. S. Blomquist

for instrumentation design, C. 0. Shoemaker and R. L. Fisher for

assistance with data analysis, and M. McPherson and J. S. Forrer for

assistance in assembling the report material.

4. References

[l] Anon., Truck noise-1, peak A-weighted sound levels due to truck

tires, Department of Transportation Report OST-ONA-71-9 (National

Bureau of Standards Building Research Division, Washington, D.C.,

1971).

[2] Society of Automotive Engineers, Inc., J336 - Sound Level for

Truck Cab Interior, SAE Recommended Practice (SAE, New York, New York,

1968).

[3] Society of Automotive Engineers, Inc., J366 - Exterior Sound Level

for Heavy Trucks and Buses, SAE Recommended Practice (SAE, New York,

New York, 1969).

-304"
FORM NBS-H4A (1-71)

2. Gov t Accession No.

U.S. DEPT. OF COMM. BIBLIOGRAPHIC DATA

SHEET

1. PUBLICATION OR REPORT NO. NBS TN-737

3. Recipient's Accession No.

4. TITLE AND SUBTITLE

Interior /Exterior Noise Levels of Over-the-Road Trucks

Report of Tests

5. Publication Date September 1972

6. Performing Organization Code

7. AUTHOR(s) William A. Leasure, Jr., Thomas L. Quindry.

Denzil E. Mathews, and James M. Heinen

8. Performing Organization

9. PERFORMING ORGANIZATION NAME AND ADDRESS 10. Project/Task/ Work Unit No. NATIONAL BUREAU OF STANDARDS

DEPARTMENT OF COMMERCE

WASHINGTON, D.C. 20234

11. Contract/Grant No.

12. Sponsoring Organization Name and Address Department of Transportation

Office of the Secretary

Office of Noise Abatement

Washington, D.C„ 20590

13. Type of Report & Period Covered Final

14. Sponsoring Agency Code

15. SUPPLEMENTARY NOTES

16. ABSTRACT (A 200-word or less factual summary of most significant information. If document includes a significant

bibliography or literature survey, mention it here.) This report presents the results of interior and exterior noise measurements which

were made on a representative sample of fifteen over-the-road trucks under various

operational modes. In-cab measurements were made six inches from the right and left

ears of the driver with windows open and closed. Simultaneous exterior measurements

were made utilizing a six-microphone array. Graphic histories of A-weighted sound

level versus time are presented for all test conditions and microphone locations. The

National Bureau of Standards made the field measurements and tabulated the data; however,

interpretation of the results is the responsibility of the Department of Transportation

and the American Trucking Associations — the joint sponsors of the study. These data

supplement the limited in-cab data available in the public domain and will form part

of public Docket No. MC-22 Advanced Notice of Proposed Rule Making concerning vehicle

interior noise levels which was issued by the Bureau of Motor Carrier Safety,

Department of Transportation, in response to Federal Regulations concerning occupational

noise exposure.

17. KEY WORDS (Alphabetical order, separated by semicolons) Acoustics; noise measurement; noise (sound) ; trucks; truck noise (exterior); truck noise (interior).

18. AVAILABILITY STATEMENT

ftxl UNLIMITED.

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21. NO. OF PAGES

317

22. Price

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