111 直方体空間内音場モード成分のフィードバック制御のための制御器設計(音響制御(1))

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This paper describes the controller design of an active feedback noise control system in an enclosure surrounded by rigid walls. A large number of operations is required for active control in a rigid-walled sound field because lots of acoustic paths between multiple sensors and multiple secondary sources can exit. The rigid-walled sound field can be expressed by the superposition of a large number of orthogonal acoustic modes. It is expected that single-input single-output (SISO) model can be achieved for each mode independently using the modal decomposition and generation technique. Therefore, an active control system with SISO H^∞ controllers to suppress multiple mode amplitudes independently based on the modal decomposition and generation technique has been proposed. In the present paper, verification of the characteristics of the proposed system to control four modes is carried out numerically and experimentally. The results show that noise reduction can be improved with designed SISO controllers.
2009-07-08