評価点の移動する1次元音場内の能動的音響制御(第1報,評価点の移動に対応可能な音響制御器の提案)

概要

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This paper proposes an active noise controller applicable to a moving evaluation point in one dimensional acoustic field. A combined adaptive feedforward/feedback controller based on filtered-x LMS algorithm is proposed. The feedforward controller is utilized for the noise reduction, and the feedback controller is utilized for the reduction of howling, which occurs with use of acoustic reference signal at feedforward controller. For the sake of stable noise control under moving evaluation point, necessity for a real time identificator of transfer function of the error path, which uses a microphone fixed in the neighborhood of the control speaker, is shown. Stable noise reduction without howling is realized by using above combined controller and the real time identificator with use of acoustic reference signal aiming practical use. A straight duct is chosen as a one dimensional acoustic field. Computer simulations and experimental analyses are carried out to clarify the validity of the proposed controller.
社団法人日本機械学会の論文
2001-02-25