Research on Numerical Analysis Technique for Sound Fields Including Perforated Plate (2nd Report, Case in Which Vibro-Acoustic Behavior of Perforated Plate is Considered)

Abstract

Numerical analysis technique for three dimensional sound fields including perforated plates vibrated by sound pressure and mechanical force is proposed. The technique is an acoust - structural coupled analysis technique which is based on boundary element method for sound fields and finite element method for perforated plates. To verify validity of the numerical analysis method, the sound field in the acoustic tube with thin aluminum perforated plate was predicted, and the computed result was compared with experiment. The sound absorption coefficient and the vibration distribution of the perforated plate computed by the present method proved to be good agreement with experimental results. We found that the accuracy of the proposed method is enough and the method is useful for designing sound absorption structure using perforated plates.