Effect of perforated plate on acoustic natural frequency of one dimensional sound field partitioned by perforated plate

Abstract

Natural acoustic frequency of one dimensional duct partitioned by a perforated plate was clarified to come down with decreasing an aperture ratio experimentally and analytically. In order to clarify the reason, the sound propagation experiment was conducted. As a result, it was clarified that the smaller the aperture ratio was the longer the sound arrival time became. This is equivalent to the getting long of the duct and the natural acoustic frequency can be considered to become low.