Laboratory studies of diffuse waves in plates

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Abstract
Measurements were conducted on the reverberant diffuse elastodynamic field in a 30- ×30- ×1.21-cm aluminum plate, the disturbances being generated by simulated acoustic emission concentrated step loads. The acoustic response in the 50- to 500-kHz range was monitored over periods of 16 ms, long compared to the 100-μs acoustic transit time across the width or length of the plate. Accurate power spectra estimates were found to require the collection of large amounts of data and to require correction of this data for the effects of absorption, or internal friction. Comparison of the frequency, time, and spatially averaged power spectra with theoretical predictions shows substantial agreement.

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