Fem/aca-bem Coupling for Structural- Acoustic Design Sensitivity Analysis

The structural-acoustic optimization shows high potential in minimization of radiated noise especially for thin shell geometries. Acoustic design sensitivity analysis can provide information on how the geometry change affects the acoustic performance of the given structure, so it is an important step of the acoustic design and optimization processes. But the sensitivity analysis of the structural-acoustic interaction based on FEM/Conventional BEM algorithm represents the bottleneck in computation efforts. In this paper, a coupling algorithm based on the finite element method and Adaptive Cross Approximation boundary element method (FEM/ACA-BEM) is proposed for the simulation of fluid-structure interaction and structuralacoustic sensitivity analysis using the direct differentiation method. The fast algorithm makes it possible to predict the effects of arbitrarily shaped vibrating structures on the sound field numerically. Numerical example is presented to demonstrate the validity and efficiency of the proposed algorithm.