評価点の移動する一次元音場内の能動的音響制御 : 第3報,二次経路同定における時間遅れ分離法の提案(機械力学,計測,自動制御)

概要

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Active noise control of a moving point has been examined in our previous papers. The feature of the model is that the transfer characteristics between the noise control source and the evaluation point (aimed noise reduction point) change with the movement of the evaluation point. Real time character identification algorithm have been introduced to handle the problem. However, the convergent algorithm used in the identification works effectively only when the system is stationary, and this is one of the reason that the identification accurcy decreases when the speed of the evaluation point increases. Besides, the evaluation point moves during the identification process of the calculation and it can cause discrepancy between identification results and the real system. We propose new technique where transfer characteristics are divided into time delay factor and main components. Once the characters are divided, the change of transfer characteristics caused by the movement appears mostly in time delay factor, and since it is the function of the location, it is easy to get the delay factor. Applying this idea, one can expect remarkable improvement in the identification. This method is examined numerically and experimentally in this paper.
社団法人日本機械学会の論文
2006-02-25