Global acoustic design sensitivity analysis using direct BEM and continuum DSA

Abstract

In this paper, a global acoustic design sensitivity analysis ( DSA ) of a field point pressure with respect to structural sizing design variables is developed. Firstly acoustic sensitivity is formulated and implemented numerically. And it is combined with continuum structural sensitivity to obtain the global acoustic design sensitivity. For this procedure GASA ( global acoustic design sensitivity analyzer ) has been developed. A half scale of automobile cavity model is considered in this paper. In order to confirm accuracy of the results of global acoustic DSA obtained by GASA, it is compared with the result of central finite difference method. In order to reduce computation tune, Rayleigh approximate solution is evaluated and compared with the solution, which used every nodal velocities. Also the acoustic optimization procedure is performed using design sensitivities. From these numerical studies, it can be shown that global acoustic DSA is a useful tool to improve acoustic problems.