Consideration of Natural Acoustic Frequency of One Dimensional Sound Field Partitioned with Perforated Plate

Kunihiko Ishihara

Noise control, Sound and acoustics, Natural acoustic frequency, Perforated plate, Transfer matrix method

Natural acoustic frequency of one dimensional duct partitioned with 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 became the longer the sound arrival time became. On the other hand, the impedance of the perforated plate was studied by Melling and it was referred by many researchers. The same analysis was also done by Dah-You Maa for a micro-perforated panel. In this paper, the relationship among the present analysis, Melling’s equation and Dah-You maa’s analysis are discussed. And the applicability of the present method will be confirmed.

https://dx.doi.org/10.31873/IJEAS.7.10.08