高調波次数成分を持つ周期性騒音に対するアクティブ騒音制御の検討 : スペクトル整形法による性能向上

概要

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In the previous papers, the authors proposed an active periodic noise control system using the filtered-x adaptive notch filter with a minimum amount of calculation. In this work, a method of improving for active noise control performance is presented for an application with multiple reference signals. Four-cylinder diesel engine noise inside cars contains fundamental and high-order harmonic frequencies. We apply active noise control for the five fundamental harmonic frequencies of diesel engine noise. When other order frequencies with amplitudes larger than those of the controlled frequencies are contained in the noise, the noise reduction effect is reduced because of interference with these frequencies in the adaptive notch filter. We solve this problem by adopting the spectrum-shaping method. This method consists of dividing the bandwidth of interest into low- and high-frequency regions using band-pass filters. This method is useful for suppressing coupling with harmonic-order frequencies and makes the control performance much better.
社団法人日本機械学会の論文
1997-09-25