音響クラスタフィルタリングによる分布定数系平板構造物のクラスタ制御 : 実験による音響クラスタフィルタリング機能の検証(機械力学,計測,自動制御)

概要

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This paper presents a novel control method utilizing acoustic cluster filtering and cluster actuation, thereby enabling one to suppress the structure-borne sound without causing observation/control soillover problems in the sense of cluster. The acoustic cluster filtering, which is realized by just only 4 microphones when the rectangular plate is targeted. Acoustic cluster is used as the error signal in this proposed method. 0n the other hand, cluster actuation is a control strategy to activate the specific targeted cluster without inducing the control spillover in a cluster sense, its conceptual background being based upon cluster filtering ; all the structural vibration modes existing in a distributed-parameter planar structure may be filtered into four clusters. First, this paper begins by introducing the transformed sound pressure vector that becomes the foundation of a cluster filtering. Then, an acoustic field function is presented, and hence sound pressure is obtained by integrating the acoustic field function multiplied by modal functions of a planar structure. Next, from a viewpoint of cluster actuation, the optimal control law for minimizing the acoustic cluster outputs is derived, its implementation being realized by using a Filtered-X LMS algorithm. Finally, the experiment using a simply supported rectangular panel is conducted, demonstrating the validity of the proposed method.
社団法人日本機械学会の論文
2003-02-25