Optimization of Acoustical Behavior of Sound Absorptions Based on Finite Element Modeling 2005-01-3580

In this paper finite element model of porous materials is used to improve the acoustical behavior of vehicle sound absorbers. The equation of wave propagation in the porous materials with rigid frame is presented after explaining the physical properties of these materials. The finite element formulation of governing equation and boundary conditions is obtained based on Galerkin method. Simulation results are compared with the corresponding results of the other validated papers and also verified by analytical results. Finally, effects of physical and geometrical parameters on the acoustical behavior of absorbers are studied. In addition, the influence of an air gap on the back of the material and also multilayer absorbers are investigated. It is shown that the acoustical behavior of these materials, particularly in the low frequency range, can be improved.