Analysis of sound field in a cabin using the boundary element method. (2nd report. Comparison between computation and experimental results for real size cabin with a rigid wall made of plaster).

Abstract

A method of analyzing the three dimensional sound field in a real size car cabin with sound absorbing materials is presented. The acoustical resonance frequency and the acoustical eigen-vector of a real size car cabin with absorbing materials are calculated using the boundary element method (BEM), assuming the boundary condition to be an impedance wall. Then the resonance frequency and the eigen-vector of the real size car cabin model made of plaster with absorbing material are measured experimentally. The calculated results are compared with the experimental results. The calculated resonance frequency and the loss factor at that frequency are approximately the same as the experimental one. Through these studies, it is concluded that the present method is useful in analyzing the sound field of real car cabin with absorbing materials.