Numerical Analysis Technique for Sound Fields Including Perforated Plate(1st Report : Case in Which Vibration of Perforated Plate is not Considered)

摘要

Numerical analysis technique by boundary element method for three dimensional sound fields in cluding perforated plates is proposed. This technique is effective to design sound absorption structures of perforated plates efficiently. To verify validity of this numerical analysis method, the sound field in the acoustic tube in which perforated plate was installed was computed, and the results were compared with experiments. The predicted sound absorption coefficient and the sound pressure distribution on the perforated plate by this numerical analysis are consistent with the experimentally measured results. In conclusion, the accuracy of the proposed method can be considered high and this method is applicable for designing sound absorption structure using perforated plates.