The boundaries of enclosures like rooms, aircraft fuselages and vehicle cabins are often elastic structures. In the low and high frequency ranges, the effect of coupling between the structures and the enclosed sound field on the acoustical response in the enclosure is well-studied. However, research into this effect at medium frequencies has been so far limited because of lack of appropriate methods. In this paper, the effect of the coupling on the medium frequency steady-state enclosed sound field response is investigated using the modal coupling analysis. The study explains how the coupling controls the occurrence of maxima and minima in the sound field response when acoustic modes overlap. It improves the basic understanding of the sound field behaviour at medium frequencies.
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