Sound attenuation in rigid ducts with bulk-reacting, sound-absorbent porous liners or splitters has been fairly extensively studied both in the absence and presence of mean gas flow in the space(s) between the absorbent layer (see, for example, references [1 31).Moreover, the influence of wall motion on sound propagation in rectangular ducts with flexible walls has been examined [4], in a study of noise "breakout" from ductwork, and it has also been shown [5] that structural/acoustic wave combinations exist wherein the energy flow can concentrate itself predominantly either in the structure or in the fluid in the duct.No efforts appear to have been made to determine the effects of wall motion on sound attenuation processes in flexible-walled lined ducts.In the analysis of
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Cummings et al. (2024) studied this question.
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