Attenuation Characteristics of Double Orifice Silencer Jointed by Permeable Membrane (Measurement and Theoretical Analysis of Sound Transmission Loss)

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  • 透過性の膜で連結した二連のオリフィス型消音器の減音特性（透過損失の測定と理論解析）

Abstract

This study deals with the attenuation characteristics of a double orifice silencer on ventilation holes. In this study, we inserted a tubular sheet of nonwoven fabric between the two orifices to improve the dip characteristics of the silencer. Then, we measured the sound transmission loss of the silencer with a four-microphone impedance tube. Simple double orifice silencers can be analyzed in one-dimension, but the acoustical analysis of the nonwoven fabric sheet is much difficult. In addition, in one-dimensional analysis, we must deal with the acoustical model with regard to the radial direction transparency of sound through the nonwoven fabric sheet. The sound transmission loss of the double orifice silencer, which bridged the nonwoven fabric sheet, was calculated via one-dimensional analysis. In addition, in this analysis, the acoustical constants of the nonwoven fabric sheets measured by the “two-cavity method” were installed in an equivalent circuit. It was observed that the analysis and the experimental results were in similar trend.

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