モード励振法を用いたアクティブ遮音制御に関する研究 : パワーモードによる制御メカニズムの解明および実験による検証(<特集>D & D 2007)

概要

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This paper deals with active control of transmitted sound power of a panel subjected to an incident sound wave. Based upon modal actuation reported in previous works, this paper presents modal actuation-based control for the purpose of reducing transmitted sound power of a panel. From a viewpoint of acoustic power modes, a dominant factor in structure-borne sound, a fundamental mechanism of sound transmission power of a panel is clarified, followed by a numerical analysis. It is shown that the (1, 3) structural mode (one of the elements of the first acoustic power mode) plays an important role in the sound transmission mechanism, and hence the (1,3) mode needs to be extracted and suppressed. For this end, three cases of actuation method are presented, control effect in terms of each control strategy being discussed. Finally, an experiment is conducted, demonstrating the significant control effect achieved by suppressing the transmitted sound power at low frequencies using the proposed method in this work.
社団法人日本機械学会の論文
2008-05-25