3D Simulation of Impedance Tube: Effect of Mesh Size on Sound Absorption Characteristic

摘要

In order to investigate the acoustic absorption of one kind of porous material, finite element method (FEM) was used. Here, we assessed the sound absorption of polyurethane foam as one of the widespread and multipurpose-usage porous material. A research was conducted to determine the sound absorption coefficient versus frequency and study the influence of mesh size on the quality of the noise absorption as a result of FEM simulation. The two microphone method as an experimental test was applied since verification of the finite element results. FEM outcomes were compared with experimental ones. Due to the gathered data, the best mesh size was specified. From the results of this investigation an equation is proposed to achieve the optimum mesh size to simulate models and to attain the closest answer to the experimental data.