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

(1^st Report; Consistency of present analysis with Melling equation)

Abstract

An natural acoustic frequency of an one dimensional duct partitioned by a perforated plate was clarified to come down with decreasing aperture ratio experimentally and analytically. The analytical results due to the Transfer Matrix Method are in good agreement with the experimental results. In order to clarify the reason, the impedance of an orifice by Melling is compared with that by the present method (T.M.M). The both impedances are in good agreement with each other. As a result, it was clarified that the Transfer Matrix Method can be used in prediction of the natural acoustic frequency of the one dimensional duct with the perforated plate.