17 Vibration Testing Clarence W. de Silva

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The University of British Columbia

17.1 Introduction ........................................................................ 17-1

17.2 Representation of a Vibration Environment .................... 17-3

Test Signals † Deterministic Signal Representation †

Stochastic Signal Representation † Frequency-Domain

Representations † Response Spectrum † Comparison of

Various Representations

17.3 Pretest Procedures ............................................................... 17-24

Purpose of Testing † Service Functions † Information

Acquisition † Test-Program Planning † Pretest

Inspection

17.4 Testing Procedures .............................................................. 17-37

Resonance Search † Methods of Determining Frequency-

Response Functions † Resonance-Search Test

Methods † Mechanical Aging † Test-Response Spectrum

Generation † Instrument Calibration † Test-Object

Mounting † Test-Input Considerations

17.5 Some Practical Information ............................................... 17-52

Random Vibration Test Example † Vibration Shakers and

Control Systems

Summary

Vibration testing involves application of a vibration excitation to a test object and monitoring the resulting

response. The first step in vibration testing is the generation of a test excitation according to some specification

or objective. The applied excitation and the corresponding responses are measured at designated locations of

the test object. Analysis of the test data will generate useful information about the tested object, which may

be applicable in design development, manufacture, and utilization of the object. This chapter presents the

basics of the planning of vibration tests, test signal representation and generation, vibration testing, and test

data acquisition.

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