Sound–Structure Coupling Analysis of Multi-Flexible Plates Enclosure

Abstract

The research on enclosure noise control is caused more and more attention. The key of noise control is to grasp physical essence about enclosure sound-structure coupling field. The research work has been carried out on a enclosure model of two simly supported flexible plate and four rigid plates. The research is focused on sound –structure coupling field analysis of the enclosure when applying primary forces on two flexible plate simutaneously. At the constraint condition of average acoustic potential energy(AAPE) formulars of enclosure sound–structure coupling field is derivated. The simulation show the follow conclusion: first, the wave energy transfer path is from primary force flexible plate to acoustic cavity, then to another flexible plate, and then feedback to acoustic cavity. Second, when structural natural frequences are the same as acoustic natural frequencies of the enclosure, the noise reach the maximum value. The third, when applying primary force on Plate a and on Plate b simutaneously, the wave energy transfer path and The relation of sound-structure coupling are more complex than only applying force on one plate.