Modelling and control of acoustic-structure interaction in 3-D enclosures

This paper addresses modelling, system identification, and control of acoustic-structure interaction dynamics for 3D enclosures. The specific configuration of interest is the one in which an acoustic disturbance is created by one of the vibrating boundaries of the enclosure. The mathematical modelling approach presented in this paper can be extended to model acoustic-structure interaction dynamics in many important real-life systems such as aircraft cabins. The transfer function and state-space models are also obtained in analytical form. The analytical model is compared with the experimental data. An alternate modelling approach using system identification techniques is also used. Differences in analytical and experimentally identified models are discussed and selected control design strategies are outlined for broadband reduction of noise.