The low frequency vibration response of a specimen in acousticfatigue tests depends not only on the dynamic characteristics and theboundary conditions of the specimen itself,but also on the test unit whichcouples the specimen to a given sound field.Further,the latter can even bedominant instead the former in some circumstances.This fact is shown in thepaper by using the experimental results and the theoretical analysis of theacoustic-induced vibration of a boundary clamped rectangular thin plate.Inanalysing the systems of acoustic fatigue test,an approach ofelectro-mechano-acoustical analogous circuit is used.The application of theapproach can give an estimation of the effcts on the low frequency vibrationmodes of various parameters in a system quantitatively.This supplies a theo-retical basis and a means for the rational layout of acoustic fatigue tests.
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