This paper discusses the use of acoustic sources for vibro-acoustic applications. Using acoustic excitation, rather than structural excitation becomes more and more industrial practice. For lower frequency applications (for instance, vibro-acoustic modal analysis in automotive applications) the acoustic source can of course not be a point source, it takes up certain dimensions in the cavity and as such changes also the vibro-acoustic character of the system one is studying, which is comparable to the well-known shaker loading in structural applications. This paper discusses a number of numerical and experimental studies carried out in order to evaluate the effect of the source size on the one hand, and to evaluate the sensitivity of the acoustic driving point frequency response function measurement on the actual position of the measurement transducers.
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