707 モード解析を用いた遮音材の透過損失の予測手法に関する研究

概要

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Transmission loss is a popular evaluation indicator of sound insulators. It is measured in reverberation room method with high cost. The mass law with considering the coincidence effect is commonly used to predict the transmission loss for homogeneous walls. However, they are derived qualitatively and based on simple assumptions. In this paper, we propose a method to predict the transmission loss by using the modal analysis. The reverberation rooms are modeled as cubic sound fields and sound insulator as a simply supported elastic plate, and the sound pressure in sound source room, the vibration of the plate, and the sound pressure in the sound receiving room are calculated. From the sound pressures in both rooms, the sound pressure level for each 1/3 octave band and the transmission loss are obtained. The effectiveness of the proposed method was verified through the comparison among the results of actual measurement, proposed method and mass law.
一般社団法人日本機械学会の論文
2011-09-05