複数の周期性騒音に対する周波数推定形適応アクティブノイズコントロール

概要

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This study is concerned with an adaptive rejection approach for periodic disturbance composed of multiple unknown frequencies components and its application to noise suppression in one dimensional duct system. We present a constant coefficient difference equation representation for sinusoidal signals. Then using this result, we obtain difference equation representation for periodic signal composed of multiple sinusoidal signals and derive the relationship between the coefficients of the difference equation and the frequencies of the multiple sinusoidal signals. Then algorithm is presented for the estimation of the frequencies of the multiple sinusoidal signals. We also propose an adaptive algorithm for generating a pseudo-feedforward control input signal such that periodic disturbance is eliminated by the response of plant. The results indicate that both the estimation algorithm of unknown frequencies is high precision and reference signal adaptive generation algorithm are stable. Finally, the approach is applied to a problem of periodic noise suppression in one dimensional duct system. Approximately 20 dB reductions of noise level were experimentally obtained both for two components of periodic noise. The experimental results show that the proposed algorithm is effective for suppression of periodic disturbance composed of multiple unknown frequencies components.
一般社団法人日本機械学会の論文
1998-06-25