Analysis of sound field in a cabin using the boundary element method. (1st report. Comparison between computation results and experimental one for real size cabin with rigid wall made of plaster).

Abstract

A method of analyzing the three dimensional sound field in real size car cabin is presented. The acoustical resonance frequency and the acoustical eigen-vector of a real size car cabin are calculated by the boundary element method (BEM), assuming the boundary condition to be a rigid wall. Then the resonance frequency and the eigen-vector of the real size car cabin model made of plaster are measured experimentally. The calculated results are compared with the experimental result. As for the resonance frequencies, the calculated results are in agreement with the measured one within about 3% error below 170 Hz. As for the eigen-vector and the frequency-response curve, the calculated result and experimental results are approximately the same. Through these studies, it is concluded that the present method is useful to analyze the sound field in real size car cabin with adequate accuracy when the boundary is rigid.