Examples of FFT analyzer with different sensors

http://www.aandd.jp■ Acceleration sensor with built-in amplifier■ Charge output acceleration sensor

Noise & Vibration
Analysis Systems

Charge amplifier
Impulse hammer

To the BNC connector of
the measurement input channel

Hardware development starting from A/D conversion technology■ Microphone and constant current pre-amplifier

Software development with high-speed DSP and wave analysis technology■ Microphone and pre-amplifier
Rotation pulse

Voice memos

Microphone amplifier

To the BNC connectors of

Rotation sensor

To the 3.5mm connector

the CompactWCA and
WCAmini external input channels

123456of the WCAmini MIC
input channel

Digital revolution indicator...Clearly a Better Value
3-23-14 Higashi-lkebukuro, Toshima-ku,Tokyo 170-0013 JAPAN
Telephone:[81](3) 5391-6132 Fax:[81](3) 5391-6148
http://www.aandd.jp
1756 Automation Parkway, San Jose, CA 95131 U.S.A.
Telephone:[1](408) 263-5333 Fax:[1](408) 263-0119

A&D Australasia Pty Ltd.
32 Dew Street, Thebarton, South Australia 5031 AUSTRALIA
Telephone:[61](8) 8301-8100 Fax:[61](8) 8352-7409

Unit 24/26 Blacklands Way Abingdon Business Park,
Abingdon, Oxon OX14 1DY UNITED KINGDOM
Telephone:[44](1235) 550420 Fax:[44](1235) 550485

Vereyskaya str.17, Moscow, 121357 RUSSIA
Telephone: [7] (495) 937-33-44 Fax: [7] (495) 937-55-66<German Sales Office>509 Udyog Vihar Phase V
Gurgaon-122 016, Haryana, INDIA
Telephone: [91](124) 471-5555 Fax: [91](124) 471-5599

Hamburger Straße 30 D-22926 Ahrensburg GERMANY
Telephone:[49](0) 4102 459230 Fax:[49](0) 4102 459231

A&D Instruments India Private Limited

Manhattan Bldg. 8F, 36-2 Yoido-dong, Youngdeungpo-gu, Seoul, KOREA
Telephone:[82](2) 780-4101 Fax:[82](2) 782-4280

Windows is a registered trademark of Microsoft Corporation.
WCA is a registered trademark of A&D Company, Limited.

Noise & Vibration Analysis Systems - ADCC-01-CR1-14200

Noise & Vibration Analysis Systems

WCA Lite
1-channel/AD3552
Dedicated FFT comparator
Works well for quality assessment of defects on the production line
Can also be used for noise or vibration monitoring

Sound analyzer / Noise analyzer / FFT analyzer
Basic FFT analysys function
A simple and convenient World Class Analyzer

4-channel / WCAmini
Small size, lightweight, USB powered unit
Freedom to carry from the place of measurement on urgent business
From FFT analysis to tracking analysis
Noise and vibration analysis full support

Ethernet

AD3552Starting in 1983 with the FFT Analyzer (AD3521) boastingworld class performance consistently, up to our latest
measurement, control and simulation devices,

AD3552

AD3552

AD3552

A&D
Noise & Vibration Analysis Device
Lineup4 to 64 Channels
CompactWCA
A4 size 16-channel housing unit
Can be extended to up to 64 channels by simultaneously connecting units
From car-mounted measurement to multiple channel measurement
Noise and vibration analysis full support

A&D has been responsible for developing devices■4-, 8-, 16-channel systems■32-channel systemwith high level noise and vibration analysis capability

Post-processing/WCAPROIn order to better meet the needs of our customers,
A&D has produced a multi-functional noise andvibration analysis system that combines the best
features of our family of products based on DSP andand high speed digital signal processing technology.

Online analysis for time series data
From FFT analysis to tracking analysis
Noise and vibration analysis full support

noise & vibration analysis technology developed since
our founding (from 1-channel dedicated comparators

WCA
Throughput
file
SONY
Recorderfile

TEAC
Recorder
file

WAV
File

to total measurement engine bench systems)

192ch
For Multiple Channel Vibration Testing
Measurement Analysis Device
Random testing
Sine wave testing
Impact testing

General Measurement
Revolutionizing engine test bench measurement
Measurement system based on AD5440
Measurement control, monitoring, collection, capture, analysis

Test chamber

A&D Technical Center and DSP ToolLab.

LAN

BNC BOX for high-speed A/D

CompactWCA and WCAmini can be customized into
an original noise and vibration analysis system for the user
Streamlining of testing work, automatic measurement

Measurement chamberOn-the-spot relay box

AD5443

PC for measurement/analysis

A level of customization learnt
from a wealth of experience

CAN communication

Temperature/32-channel
Static strain/16-channel

Temperature (K type thermoelectric couple)
Static strain (Load cell, etc.)

Analog signal
ADX:RPT*

A/D 48ch

Crank angle
Signal (analog)

Charge amplifier
Torque amplifier
FV, etc.

Measurement object*Communication is possible with RPT development tools from other companies

12Noise & Vibration Analysis Systems

FFT Comparator

Small 4-channel Noise & Vibration Analysis System

AD3552

WCAmini AD3661
FeaturesFeatures▶ USB powered unit (no AC adapter required)▶ Easy operation by LCD touch panel▶ 24-bit, 4-channel measurement (TEDS compatible)▶ Ethernet, DIO and Serial Board are standard features on the interface▶ Dedicated channel for tacho pulse measurement▶ Automation of quality judgments for defects on the production line

▶ Multi-analysis WCAPRO-compatible software▶ Detects irregular performance in machinery early▶ FFT analysis, throughput recording and playback analysis▶ Contributes to prevention of breakage of equipment or testing devices
when irregularities occur▶ Real-time octave analysis (optional)▶ Tracking analysis (optional)▶ Filtering function (optional)● Small and lightweight 1 x 1.4DIN unit
which can easily slot into a rack

▶ Voice memo input and sound playback▶ Includes easy-to-use measurement assistance menu

● Easy to operate dedicated comparator● Achieve central control and network compatibility
Ethernet● Small and lightweight USB powered unit
● User-friendly GUI and simple support menu
● Compatibility with CompactWCA and WCAonPC● Full support provided for this minimum configuration device
which still provides equivalent analysis to multiple channel systems

Small and light enough to fit into your travel case
AD3552

AD3552

AD3552

AD3552Analyzer setup

Comparator setup

WCAmini

Quality judgments for defects on the line

Monitoring for pump irregularities

Block comparator

PC

Acceleration sensor
with built-in amplifier

Sensors, cords, etc.
TEDS compatible
Microphone

Shape comparator

Experiments or tests on location

Measurement example

Transfer function measurement

Space-saving equipment

Ethernet

File transmission by Ethernet
and central control are possible

3

4

Noise & Vibration Analysis Systems

Sound Analyzer / Noise Analyzer / FFT Analyzer
WCA Lite

A simple and convenient World Class Analyzer (WCA)
Features

Specifications▶ Basic FFT analysis function▶ Spectrum

Number of Input Channels

4

Frame Size

64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536▶ Power spectrum density function

Input Impedance

1 MΩ

Frequency Range

40kHz - maximum▶ Transfer function (H1)

Input Coupling

AC, DC, ICP

Real-time Analysis Frequency

20kHz

Input Range−20dB (141mV), 0dB (1.41V), +20dB (14.1V)

A/D Converter

24 bits

Trigger Source

Input Channel, External Input

Dynamic Range

100dB▶ Auto-power spectrum▶ Coherence function▶ 1/1, 1/3 octave

1

3

Vibration measurement example: results using 4 acceleration sensors(Results from attaching acceleration sensors in 4 different places and measuring on 4 channels simultaneously)

Transfer function measurement example
Results using an impulse hammer and a single-axis acceleration sensor(Measurement of the response acceleration spectrum of the z-axis direction after inducing vibration in thesame z-axis direction of the object being measured)

5

2

4

Analysis

Input▶ Time function

Noise measurement example: results using a microphone(Measurement results from a microphone placed 1 meter away from the object being measured)Transfer function measurement example
Results using an impulse hammer and a triple-axis acceleration sensor(Measurement of the response acceleration spectra of 3 axes directions (x, y & z) while simultaneously
inducing vibration of the z-axis direction of the object being measured)6振動・騒音解析

In-vehicle Realtime Noise & Vibration Analysis System

Multi-Analysis Software

Compact WCA

WCAPROAD3651
Noise & Vibration Analysis System for Applications
from In-vehicle Tracking Analysis to Multi-point Excitation
Features

WCAPRO multi-analysis software delivers an easy to handle userinterface as a Windows application. By connecting to the front end
CompactWCA and WCAmini, WCAPRO can support noise andvibration test analysis as a realtime FFT analyzer.

▶ Throughput function a standard feature

Also, by adding the relevant optional functions, it is possible toperform realtime octave analysis, tracking analysis and filteringfunction in an integrated manner.
With the throughput function, it is possible to perform time series
data recording (standard) over a long period of time as well as
repeated playback analysis. Offline post-processing analysis with astandalone PC is also possible (optional).

▶ Battery for in-vehicle testing use (optional)

WCAPRO supports COM interface.

▶ Compact A4-size design▶ 24 bit AD used
▶ Realtime octave analysis (optional)▶ Tracking analysis (optional)▶ Filtering function (optional)▶ Dynamic range 100dB

WCAPRO can be controlled and the screen easily customized using
VB, VBA, etc.

▶ Supports multiple tacho inputs▶ Multi-input, multi-output (MIMO)● Compact 16-channel unit suitable for in-vehicle use● Compatibility with WCAmini and WCAonPC● Extendable to up to 64 channels by simultaneously connecting units● Can be used either as a single unit
or by connecting multiple units● User-friendly GUI

In-vehicle test

Noise
Noise
&&
Vibration
VibrationAnalysis
Analysis Systems
System■ User Interface

Example of 16-channel configuration
Data control window
3D cursor display and 2D data cut-out window● Use of all WCAPRO features is possible,
such as in-vehicle tracking measurement● Easy one-touch operation in the vehicle
cabin with a customized screen using
COM interface

3D data post-processing window
2D cursor display anddata list window

Kit for in-vehicle use is available as an option■ Realtime FFT Analyzer
Test with multiple channel simultaneous measurement

Example of 64-channel configuration

Simultaneous measurement is possible with dedicated synchronous signals
by connecting the unit and PC through the hub by LAN cable

7CompactWCA

AD3651

WCAmini AD3661

8

振動・騒音解析

Noise
Noise
&&
Vibration
VibrationAnalysis
Analysis Systems
SystemMulti-Analysis Software

Offline Post-Processing Analysis Software

WCAPROWCAPRO■ Optional Functions
Realtime octave analysis

Tracking analysis
WCA
Throughput
file

When WCAPRO is not connected in the front end it
can be used for offline post-processing analysis(optional).

SONY
Recorderfile

For a long period of time series data or an analysis
data file, WCAPRO’s functions can be used on a file.

TEAC
Recorder
file

WAV
File

Filtering function■ Process to Data Analysis■ Throughput Function■ Screen Customization

The window below shows time series data in total wave
form display and enlarged display.
Confirmation of data covering a long period of time,
designation of the analysis range, sound playback anddesignated range can all be exported to a separate file.
Further, it is possible to convert time series data to CSV
files, WAV files or MAT files (Level 4); or read a CSV file astime series data

The customized window below is an example of returning toa fixed condition file and repeating collection. It is possible
to perform FFT analysis or tracking analysis with only 6
buttons.
A free COM sample is provided

Designates the destination to save data
Returns to measurement conditions file

WCAminiCompactWCA

Throughput
file

TEAC

TAFFmatfile

LX-110/120

GX-1

SONY SIR Series

Pscan Ⅱ,Ⅲ
file

WAV
file

Binaly( Intel 86 )16-bitEX Series

Performs correction
Performs data collection

WCAPROTime series data file reading function

Stops data collection
Saves measurement data file9

FFT analysis, tracking analysis (2D/3D), realtime octave analysis, filtering function10振動・騒音解析

Noise
Noise
&&
Vibration
VibrationAnalysis
Analysis Systems
SystemMeasurement Analysis Device for Multiple Channel Vibration Testing

Engine Bench Integrated Measurement System

Simple operation of multiple channel data measurement, analysis, graph printout and CSV file saving

Improvement of the engine test bench measurement environment■ Vibration TestingWith a system with the AD5440 at its base, various signals thatdiffer from the sampling speed, such as revolutions, torque andangle, have measurement control, data monitoring, collection,saving and analysis performed. With the analysis application, usernames, specification data, etc. will be subject to improved uniform
management and work efficiency in the database.

● Random test
FFT analysis (time waveform, effective value, spectrum, power spectrum, PSD, cross spectrum,transfer function, coherence, autocorrelation, cross correlation)● Sine wave test

The system provides a wide range of analysis functions such as
crank angle graphs, tracking graphs, filtering function, arithmetic
processing, FFT analysis and order tracking. It is also possible toexport data to Excel.
Using the RTS torque sensor it is possible to perform high precision
torque wave measurement.

Analysis of responsiveness to frequency of sine wave sweep test

● Shock test
Using shock response spectrum (SRS) analysis, evaluation of the damage potential fromshock excitation experienced by the test specimen■ Main Features
Maximum 192ch charge amplifier and AD input (including anti-aliasing filter)
Continuous collection to 5120Hz sampling (maximum 15 minutes)
Simultaneous sampling up to 40960Hz (192ch x 40960Hz collection buffer capacity: maximum 10 seconds)

Color map

Tracking graph

Maximum 16ch wave form monitor function (time wave form, spectrum, PSD, transfer function, coherence, etc)
Data saving format is WCAPRO throughput file

*Vibration testing device, control not included

RTS torque sensor

Example of attachment of dynamo intermediate axis

Crank angle and torque graphMeasurement System
Test chamber

PC for measurement / analysis

On-the-spot relay box

AD5443LAN

CAN communication

Filtering function

BNC BOX for high-speed A/D

Measurement chamber

Temperature/32-channel
Static strain/16-channel

Temperature(K type thermoelectric couple)

Analog signal

Static strain (Load cell, etc.)

ADX : RPT*A/D 48ch

Mathematical calculation

11

Crank angle
Signal (analog)

Charge amplifier
Torque amplifier
FV, etc.

Measurement object*Communication is possible with RPT development tools from other companies

12Noise & Vibration Analysis Systems

Introducing the Applications■ Automatic Defect Detection Using FFT Analysis on a Bearing Inspection Line■ FFT Analysis
On top of frequency analysis of noise or vibration, etc., FFT analysis
can be used widely for many other purposes. An acronym standing
for Fast Fourier Transform, FFT is an algorithm which can calculate
at high speed which frequency components are found to what
degree inside signals.

As each frequency component found by FFT has a narrow frequency
range they are expressed as line spectrums and FFT analysis is also
referred to as narrow band analysis. It is very useful for figuring out
the frequency components of vibrations or noise, etc. For noise
analysis, as it has a high correlation with humans’ auditory
perception, the 1/3 octave band is used a lot. As it is used to
calculate the octave band from the spectrum found by FFT, it is also
called the FFT formula octave.

The value of a bearing is determined by how smoothly they rotate
while in use. If they have flaws inside, when they rotate vibration will
occur. The relationship between the location of the flaw (on the innerring, outer ring or rolling balls) and the vibration frequency that

occurs is quite clear, so with analysis of the vibration frequency with
the AD3552, automatic determination of whether a bearing is flawed
or not is possible.

Acceleration sensor
Inner ring

Judgment output

Vibration measurement example for motor, pump
AD3552

Acceleration sensor, FFT analyzer(WCA or CompactWCA)

Rolling balls
Judgment examplez ⋅ N/60 d N: Inner ring frequency
INNER =
cos α 
1 +
2
D


d: Rolling ball diameter

OUTER =z ⋅ N/60 d Z: Rolling ball frequency
cos α 
1 −
2
D



D: Pitch circle diameter of the axle bearing

CompactWCA

BALL =

 α：Angle of contact
D ⋅ N/60 d2
1− 2 cos 2 αdD n：1、2、3、4…

LAN terminal

Noise measurement example for transmission

Signal input

OK (quality product)

NG (defect)

Block comparator
Judgment results 1-5

Block comparator
Judgment results 6-10

Total overall
Comparator judgment results

AND・OR

AND・OR

Shape comparator
Judgment results

Block comparator
Judgment results 11-15

Block comparator
Judgment results 16-20

AND・OR

AND・OR

DI/DO

Microphone, FFT analyzer(WCA or CompactWCA)

Power
terminal

SerialExternal trigger input[ Digital input/output communication ]Input: data collection start/finish, data saving, etc.
Output: individual judgment results, total judgment results, etc.

[ Serial (RS232C) communication ]Input: data collection start/finish, data saving, etc.
Output: individual judgment results, total judgment results, etc.

13

AND・OR

Total judgment results

14Noise & Vibration Analysis Systems

Introducing the Applications■ Transfer Function Measurement and Test Modal Analysis by Impulse Excitation Technique
As a comparatively simple system configuration and an easily
performed test modal analysis method, measurement can be madeof the excitation signal created when the test object is given
excitation force from an impulse hammer, as well as the response
signal. The response signal is measured by the force sensor at the

tip of the impulse hammer and the acceleration sensor, etc. By
importing these signals to the FFT analyzer, the transfer function
which expresses the response characteristics of each frequency ofthe structural object can be sought.

■ Tracking Analysis
To understand the relationship between the characteristics and the uniquevibration frequency of the degree component of the rotary machine,
tracking analysis is an effective tool. Rotating bodies such as engines or
motors, etc. have rotational components that change frequency when theydiffer from the unique vibration and the rotation speed changes. The
phenomenon that occurs for the first time on the first revolution is definedas the 1st degree revolution, the phenomenon that occurs on the nth time isdefined as the n th degree revolution, and the rotational component isreferred to as the degree component. On the horizontal axis : The degree
spectrum turns the rotation speed into degrees and mimics it. Tracking
analysis is searching for the change in level for each component of thisdegree spectrum. It is very valuable to understand the relationship between
the degree component of the rotating body and the unique vibration
frequency and figure out the resonance point of the degree component.

[ Example of processing the degree component in realtime ][ Measurement connection example ]Impact hammer
Acceleration
sensorTime function of excitation signal

Time function of response signal

FFT analyzer

PC

…

…

…

EngineAnalysis by WCAPRO

Analysis from ME’scope

Transfer function calculated from timefunction of response and input

Curve fit is performed on the measured transfer
function and the modal parameter extracted

Microphone

PC
Acceleration sensor
FFT analyzer(WCAmini or CompactWCA)

Rotation sensor

123456
Digital tachometer[ Example of confirmation of rotational component and resonance frequency captured in a 3D spectrum ]Mode shape animation

A characteristic vibration
exists at around 900Hz

Coherence function to evaluate
the reliability of the test

Temporal waveform while capturing data

Spectrum while capturing data

15

Spectrum map after capturing data

16

Noise & Vibration Analysis Systems

Introducing the Applications■ Tracking Analysis■ Realtime Octave Analysis
Example of cutting out degree component with 3D cursor

Spectrum map
and 3D cursor

Diagrammatic tracking diagram of cutting out with 3D cursor

Realtime octave is a method for calculating the octave band by
applying a digital filter to time series data on the time axis. In order
to distinguish it from the octave of the FFT method calculating theoctave band from the spectrum found by FTT, it is also called thedigital filter octave.
The octave of the FFT method which seeks the number of octave
bands differs in the frame size for processing FFT and in order tosearch for lower bands it is necessary to make the frame size larger.
If the frame size is made bigger, as the time taken to measure one
frame grows longer, it is unsuitable for analysis of sound which
varies from moment to moment.

The octave of FFT method is suitable for analysis of a steady sound.
Digital filter octave does not perform FFT processing, but as it isprocessing by applying a digital filter to the time axis it is possible tosee how excessive noise is changing over the lapse of time. Also, it
is always possible to search for both higher and lower bands.

Example of 3D data display
Analysis of transmitted

Spectrum map

acceleration exhaust soundSpectrum
Campbell diagram

Analysis of excess data

17

18

Noise & Vibration Analysis Systems

Introducing the Applications■ Vibration Analysis using Throughput Function
Uses a playback analysis function by directly recording time series
data onto the hard disc of the computer, and measurement andanalysis of shock waves can easily be performed.
While it is also possible to measure using the trigger function, when
the timing of shock wave generation is more or less understood it is■ Experiment Analysis of Vibration /Acoustic Phenomena of Machines /Structural Objects
possible to record time series data from a few moments prior andeasily analyze only the necessary data which has been confirmed
as waveform. As it is also not necessary to set the trigger, operation
is easy with no preliminary measurement needed and analysis
possible in a short period of time.

With data measurement by CompactWCA and WCAmini, and analytical processing by ME’scopeVES,
the vibration/acoustic phenomena of machines and structural objects can be easily analyzed.
*ME’scope is a product of Vibrant Technology, Inc. (A&D provides retail and support)

Real Operation Analysis
Based on the data measured by CompactWCA and WCAmini, it ispossible to create a visual animation of the real operation conditionsof structural object or walls. Time, frequency and order animations
are used to comprehend these real operation conditions. Real
operation analysis is only the measurement and analysis of the
response of the real operation conditions of the test object.

The method of imparting excitation force on the test object andmeasuring its response is used a lot for difficult cases, but as it ispossible to easily figure out the deformation pattern (bending,twisting, etc.) of the test object it will produce an effect as a basic
tool for someone just starting experimental modal analysis.

Analysis starting position

Zoom display

Enlarged shock wave display and total waveform display
from recorded time series data

Spectrum of shock wave

19

Time Animation

Frequency Animation

Order Animation

Possible to animate thePossible to animate the deformation

If the machine or structural object isdeformation pattern with time

pattern for specific frequencies bya rotating body, it is possible tohistory data of the real operation

frequency domain data of the realanimate the deformation patterns ofconditions of machines oroperation conditions of machines or

each degree component forstructural objects

structural objects

rotational change

Designating the analysis starting time on the enlarged shock wave display screen

Temporal waveform of shock wave

20

Noise & Vibration Analysis Systems

Introducing the Applications■ Stress Tracking

Experimental Modal Analysis
Based on data measured by CompactWCA and WCAmini, it ispossible to identify the unique vibration frequencies of structuralobjects (mode frequencies), damping ratios and mode shapes.
With experimental modal analysis, from imparting excitation force
on the test object, measuring the response, and using the transfer

function data from that response, the dynamic characteristics(unique vibration frequencies, damping ratios and mode shapes) ofmachines and structural objects can be sought. From mode shape,
the differences in deformation patterns (bending, screwing, etc.)
in each unique vibration frequency can be figured out.

Stress tracking can be performed using CompactWCA or WCAmini’s
tracking analysis functions. Maximum stress and minimum stresssynchronized to the number of revolutions are measured andintensity towards the parts of the rotary machine can be confirmed.
From the maximum and minimum stresses the average anddifference is sought and on the horizontal axis the stress tracking
lines for the revolutions are drawn.

Sound Analysis
Based on data measured by CompactWCA and WCAmini, soundintensity, sound pressure level (SPL) and sound power are sought
and it is possible to effectively display the relationship between thevibration of the surfaces of machines or structural objects andsound data. Further, with the creation of an animation displaying
vibration and sound data together, vibration and sound issues canbe tested.

Amplifier

Strain gauge

123456

Rotation sensor

21

Digital tachometer

22

Noise & Vibration Analysis Systems

Introducing the Applications■ Sound Power Level Measurement■ Field BalanceSound power level measurement can be per formed using
CompactWCA or WCAmini’s realtime octave analysis. Sound power
level can be obtained from the sound pressure level recorded by 10
microphones set up on the measurement side of the object.

Field balance is determined by using the tracking analysis functionof CompactWCA or WCAmini. The size of the unbalance of therotating body is measured, and using the test weight it is possible todefine the attributes of the unbalance (location, mass) and reduce its
size. Either a one-sided or two-sided balance can be corrected atjust one speed.

zMeasurement surface

Standard containeryxBasic microphone setup

Initial test

[ Processing flow for a one-sided balance ]With measurement by 1 point per 1 side, 1ch measurement channel and 1ch tach input are used.

Test weight(1) Initial test: data is gathered for the condition of the unbalance(2) Test weight: Data collection with the test weight attached

Modified calculation

Confirmation test

Connection example(3) Modified calculation: Based on the above result,mass and location of the test weight are calculated(4) Confirmation test: Data collection with the test weight attached

CompletePC
USB cable

Digital rotation indicator

123456
Rotation signal
Vibration signal no. 2

Vibration signal no. 1

Acceleration sensor
Rotation sensor

Photocopying machine or similar
Rotating body(rotor)

23

Motor

24

Noise & Vibration Analysis Systems

Introducing the Applications■ Rotational Fluctuation/Torsional Vibration Analysis
It is possible to analyze the rotational fluctuation component fromthe rotational signal (time series data) recorded with the throughput
function of CompactWCA or WCAmini.
SignalFourier transformation■ Customization based on years of experience

By the instantaneous frequency method using analytical signals, theinstantaneous angle of rotation of the rotating body can be sought.
The fluctuation in the angle of rotation is found from theinstantaneous angle of rotation and the difference from its averagevalue of movement.

CompactWCA and WCAmini can be used to customize a user
original vibration noise analysis system●WCAPRO can be freely controlled with COM interface●An original system is presented, applying 27 years of historyof the FFT analyzer and an abundance of support experience

Calculate the average value of
movement and its difference

The torsional vibration component is found from the difference inthe angle of rotation between two points on the rotational axis, e.g.
drive side and load side.

Vibration Noise Total Analysis System

Fluctuation in angle of rotation

By tracking analysis of the torsional vibration component, for theintensity between the two points on the axis, it can be learnt at aroundwhich frequency there is a transformation from rigid to soft, etc.

An operation system is realized with user control of FFT analysis, hammering analysis,
octave band analysis and further original analysis by the user

Example of Customization① Channel settings② Calibration③ Collection condition settings④ Analysis condition settings⑤ Data collection

Set the frequency of the load to zero

Inverse Fourier transformation
Ch1 rotational pulse signal
Ch2 rotational pulse signal

Instantaneous phase (frequency)⑥ Measurement data confirmation⑦ Data saved⑧ Post-processing⑨ Graph display/printing⑩ Data management

Computation of the angle of rotation using instantaneous frequency

Recording of time series data
Time series
data file

Main menu
Fluctuation Ch1
Fluctuation Ch2

Extraction of rotational fluctuation(torsional vibration) component

FFT analysis menu

Difference in the angle of rotation between two channels
Screen during measurement
FFT analysis
Tracking analysis

Time series
data fileTorsion Ch1-2

Settings are for necessary functions
only, other settings are automatically

Rotational fluctuation and torsional vibration do not remain thecause of unwanted vibration noise, but can influence the durabilityof the rotating machinery, and sometimes could lead to damage ofthe system. It is very important to determine the resonance point of
the degree component and unique frequency of the axis.

[ Example of torsional rotation analysis ]set on the customized application forimproved work efficiency.

Intended usage : rotational fluctuation analysis of ship engines

With the same operation system used

Torsional vibration analysis of the crankshaft of car engines

for different types of analysis a manual
is no longer needed.

Electromagnetic pickup

25

26

Noise & Vibration Analysis Systems

Introducing the Applications■ Customization based on years of experience
Testing System with Durable Operational Performance

Performance Testing System

Vibration, unwanted noise, temperature, load data, etc. can be measured over a long
duration and performance tests performed.
As abnormal values trigger an alarm and stop the testing device, it is possible to keep
any damage to the device to a minimum.

It is possible to automatically repeat tracking analysis on the operation pattern of transmission benches, etc., and conduct performance tests.
● Possible to perform tracking analysis on vibrations and unwanted noise together,and make judgments according to standard values● Possible to gather data for a spectrum map,and perform degree processing by post-processing● Degree spectrum analysis possible at steady rotation time

Strain gauge● Extraction of peak value at each designated section
and statistical processing possible● Possible to save analysis data and output as text
● Possible to redisplay saved and overwritten data
● Possible to print graph display (individual or collated)

AmplifierVibration
Unwanted noise
Temperature
Rotation pulse

CompactWCA
By performing consecutive sound and vibration analysis when
testing the durability of an engine’s transmission or brakes, etc.,
it can be applied as abnormal or evaluative back data.
Together with a safer testing environment, it can be of great help
for endurance testing.
Please try formulating your own personalized
vibration and sound analysis system.
Office-wide operating procedures or configurations
can be refined and with data management theefficiency of test results can be improved.
For repeatable tests, by pre-defining measurement
patterns automatic measurement can be realized.
A&D’s customization skills garnered through yearsof experience can be of use to any customer.

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Transmission method
DIO, Ethernet, Serial, etc

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