‫ە‬Research Trends and Results

Noise by Vehicle TypeSONE Shinri, HeadYOSHINAGA Hiroshi, Senior Researcher
ANDO Shingo, Guest Researcher
Road Environment Division, Environment Department1) http://www.cev-pc.or.jp/
2) D. Kamoshida, et. al.: A development of the new "indexof the noise" and the practical use , J. INCE/J, Vol. 34, No. 5,pp. 429-432, 2010
3) Y. Watanabe, T. Deguchi: A Consideration on Reducing
Road Traffic Noise by Widespreading Low-noise Vehicle
Like Electric Ones, Infrastructure Planning and Management
Research: Collected Papers, No. 13, pp. 939-947, 19964) ASJ RTN-Model 2008: J. Acoust. Soc. Jpn. , Vol. 65, No.

㻢㻜owned (10,000 units)
᥎ᐃಖ᭷ྎᩘ䠄୓ྎ䠅

Estimated number of vehicles

4, pp. 179-232, 2009 㻡㻜㈌≀㌴➼
Trucks, etc.

㻠㻜Passenger cars and஌⏝㌴㻗㍍⮬ື㌴
compact cars

㻟㻜
㻞㻜
㻝㻜
㻜

2001 2002 2003 2004 2005 2006 2007 2008



Figure 1. Number of Hybrid Automobiles Owned(in Japan)1)
Photo 1. Fuel Cell Powered Bus(Haneda Airport Limousine Bus)
䐟ᅜෆ䛾ᖹᆒⓗ䛺஌
(1)
Average passenger carin Japan 4)⏝㌴4)

㻝㻝㻜(2)
Coasting (Gasoline 1䐠᝼ᛶ㉮⾜BOX 1)(䜺䝋䝸䞁1BOX1)

5 dB

㻝㻜㻜LWA䠄䡀B)
1. Purpose
Various supplementary noise abatement measures
have been taken in the past, according to the following
documents and trends, (1) to (4), the spread ofautomobiles with little or no engine noise can becounted on to reduce noise. (1) The number of hybrid
vehicles is soaring(Fig. 1), and (2) the noise inside
highway busses is about 5dB lower than that ofnormal public busses2). (3) The noise reduction which
would result from the conversion of all automobiles tolow noise vehicles is estimated at about 6dB3). (4) The
operation of fuel-cell powered busses (Photo 1) is
another example. This report presents the results ofmeasurements of quantity of sound generated bylow-pollution cars etc. during test runs (dense asphalt
concrete pavement) at the test track in NILIM 
2. Measurement results 
Coasting passenger cars and electric vehicles
produced noise approximately 5dB below that of an
ordinary passenger car measured on a public road4)(Fig. 2). And a medium size low-pollution heavyvehicle produced about 5dB less than ordinary
medium heavy vehicles measured on a public road4)(Fig. 3). 
3. The futureWe presume that clarifying the reasons for these
5dB differences would contribute to further loweringof noise. On the other hand, over 10 years have passed
since the measurements which obtained data
representing quantities of noise produced by vehicle
type used to predict noise (heavy vehicles, medium
heavy vehicles, small trucks, passenger car). The
results of confirmation of their appropriateness will bereported in the future. [References]

(3)
Coasting (Gasoline 1䐡᝼ᛶ㉮⾜BOX 2)(䜺䝋䝸䞁1BOX2)(4)
Coasting (Sedan hybrid䐢᝼ᛶ㉮⾜vehicle)(䝉䝎䞁䝝䜲䝤䝸䝑䝗㌴)
EV(compact 1)
vehicle 1)
EV(㍍஌⏝㻥㻜EV(compact 2)
vehicle 2)
EV(㍍஌⏝
EV(Minicar 1) 1)
EV(ཎ௜ᅄ㍯㻤㻜
㻞㻜 Speed㏿ᗘ 㻔㼗㼙㻛㼔㻕

㻣㻜EV(Minicar 2) 2)
EV(ཎ௜ᅄ㍯

Figure 2. Results of Measurements During Steady
Running of Passenger Cars

㻝㻝㻜



(1) Average medium-size䐟ᅜෆ䛾ᖹᆒⓗ䛺୰
car in Japan 4)
ᆺ㌴4)

㻝㻝㻡5 dB(2) Hybrid vehicle 1䐠䝝䜲䝤䝸䝑䝗㌴䠍㻝㻜㻡

LWA (dB)

Research Trends and(Key words) Road traffic noise, hybrid vehicle, low-pollution vehicle

(3) Hybrid vehicle 2䐡䝝䜲䝤䝸䝑䝗㌴䠎
(Largeengine to power a(෭ⶶ෭෾㌴䛾䛯䜑
freezer or refrigerator truck)䜶䞁䝆䞁኱)
䐢ኳ↛䜺䝇㌴䠍
(4) Natural gas vehicle 1㻝㻜㻜㻥㻡䐣ኳ↛䜺䝇㌴䠎
(5) Natural gas vehicle 2㻥㻜㻤㻡㻞㻜 Speed㏿ᗘ 㻔㼗㼙㻛㼔㻕㻣㻜䐤ᑠᆺ㈌≀㌴(6) Compact truck
Tiresurface noise䝍䜲䝲㊰㠃㡢(ཧ⪃)(reference)

Figure 3. Results of Measurements During Steady
Running of Medium heavy vehicles 