A generalized approach for the acoustic radiation from a baffled or unbaffled plate with arbitrary boundary conditions, immersed in a light or heavy fluid

摘要

The present paper is dedicated to the study of the radiation of a baffled and/or unbaffled plate with arbitrary boundary conditions. The proposed work deals with a complete and rigorous fluid-structure coupling. A Rayleigh-Ritz approach is used to develop the plate deflection and, in the unbaffled case, the sound pressure jump function. A suitable set of trial functions is proposed. It allows to obtain only one generic numerical code for all the boundary conditions and-a key aspect of the formulation-for both the baffled and the unbaffled plate. An efficient numerical scheme is proposed for the computation of the radiation impedance coefficients. A good agreement is found with a numerical approach based on the boundary element method. Validation with experimental results is also presented. The present formulation provides a useful tool to perform a clear and systematic comparison between the baffled and the unbaffled plate. (C) 1998 Academic Press Limited. [References: 25]