Structural-acoustic coupling effect of a rectangular cavity comprising a windowpane and five rigid walls and its control (Experimental approach)

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  • FUKUDA Ryoji
    Tokyo Metropolitan Industrial Technology Research Institute, Research and Development Department
  • TANAKA Nobuo
    Tokyo Metropolitan University

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  • 窓ガラスを構成要素とする直方体キャビティにおける強連成モードとその抑制（実験的アプローチ）

Abstract

This paper deals with a structurally-acoustically coupled rectangular cavity comprising a flexible windowpane and five rigid walls. It is the purpose of this paper to perform active control of a windowpane with a view to enhancing its transmissibility loss. First, using an operational modal analysis the coupling effect emerging on the windowpane under a strongly coupled cavity is investigated. It is then found that there exist two kinds of coupled modes: one is dominated by an in vacuo vibration mode of a panel and the other by an acoustic cavity mode. Among the latter modes an isolated implosive mode is found, which is predominantly governed by an acoustic cavity mode due to a specific support of a windowpane. It is further revealed that the isolated implosive mode may not be suppressed by vibration control, but by acoustic control only. Finally, active structural-acoustic control is performed on the windowpane, demonstrating sufficient control effect over all the coupled modes with synergy effect as a result of employing both vibration and acoustic control.

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