微細多孔吸音板を含む音場のシミュレーション技術と製品開発への適用

摘要

A numerical analysis technique is proposed for three-dimensional sound fields, including perforated plates vibrated by sound pressure and mechanical force. This technique involves an analysis coupling acoustics and structure, in which boundary element method is applied to sound field and finite element method is applied to perforated plates. To verify the validity of this numerical analysis method, the sound field in an acoustic tube with a thin aluminum perforated plate was analyzed by this method and the computed result was compared with the experimental result. The sound absorption coefficient of the perforated plate computed by this method proved to be in good agreement with the experimental results. It was found that the accuracy of the proposed method is sufficient and is useful for designing sound absorption structures using perforated plates.