著者

藤本,和宏

出版者

日本機械学会

雑誌

振動・音響新技術シンポジウム講演論文集

巻号頁・発行日

vol.2001, 2001-06-05

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As a suppression tool for the noise due to micro pressure wave induced by linear motor trains, the array of Helmholtz resonators set inside a tunnel wall is discussed. The experimental study is carried out using a 1/200 scale model of the tunnel, where a PA driver is employed as a source for finite amplitude sounds of micro pressure waves. It is found that the shock formation distance is longer when the resonator array is provided. The impulse response of a single pair of Helmholtz resonator is taken into account for the numerical simulation based on the weak shock theory. The calculated result agrees well with the experimental result. We also show the way of estimation in absorption effect of Helmholtz resonator.