Sensitivity Analysis for Coupled Structural-Acoustic System with Absorbing Material Using FEM/BEM

Abstract

Since the acoustic impedance in water cannot be neglected with respect to the mechanical impedance, the acoustic radiation caused by the vibration of structures in the compressible fluid would react to the structure. Therefore, the fluid-structure interaction needs to be considered. The finite element method is used for structure vibration analysis and the boundary element method for acoustic analysis. Sound absorption materials are used to reduce the scattering sound field in the reference region. The sensitivity analysis of a fully coupled structural-acoustic system is proposed. Numerical tests verify the correctness of the proposed algorithm.

Acoustic Analysis of Multi-Frequency Problems Using the Boundary Element Method Based on Taylor Expansion

“…Among these numerical methods, the boundary element method (BEM) has a better application value than the finite element method (FEM) in the acoustic analysis due to its high accuracy, dimensionality reduction, and easy mesh generation [14][15][16][17][18]. In addition, for the external acoustic field, the Sommerfeld radiation conditions at infinity are automatically satisfied [19][20][21]. Engineering acoustic problems are often unbounded, and the BEM can automatically transform the infinite domain problem into a finite domain problem on the boundary.…”