スマートセンサを用いた音響放射パワーのアクティブ・コントロール : 適応フィードフォワード制御による音響放射パワーの抑制

概要

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This paper deals with the problem of sensing structural vibration to provide an error signal to adaptive feedforward control systems implemented to globally attenuate both structural and acoustic disturbances. This paper demonstrates the validity of a newly proposed smart sensor made of PVDF distributed parameter sensors designed to measure power modes of the total acoustic power radiating from a vibrating plate. Firstly, with a PVDF distributed parameter sensor attached over the whole plate, the formulas for sensing the j-th power mode are derived. Then, by considering the practicability of the smart sensors, alternate formulas for sensing the power mode are derived for a strip-type smart sensor. The characteristics of the smart sensors optimally shaped for measuring the power modes are also shown. Moreover, based upon an adaptive feedforward filtered-χLMS algorithm, an experiment was conducted demonstrating the minimization of the acoustic power radiated from a vibrating plate.
一般社団法人日本機械学会の論文
1994-05-25