短い膨張空洞での共鳴特性及び音場の空洞寸法依存(機械力学,計測,自動制御)

概要

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The performance of an expansion chamber in a circular duct depends on the chamber length. If it becomes shorter than a specific length (so-called transition length from acoustically long to short), the chamber's property changes remarkably, and starts to act as a resonator muffler. While several researchers have investigated such short chamber's properties, the authors also treated them using experimental, analytical and numerical methods. Generally, their properties are realized using two interpretations: i.e., in contrast with a side-branch muffler (a quarter wavelength tube); or based on the cut-on phenomena of the radial modes in the chamber. However, no one has seemed to give any further description to bridge a gap between above two interpretations. In this research, for the purpose to clarify this situation and summarize short chambers' properties, comprehensive investigations are carried out for various sizes of the duct-chamber system and several (plane and asymmetric) mode waves incidence. Especially, in order to improve physical understanding, sound pressure distributions in the duct system are indicated using the numerical calculation (FDM) for various duct-chamber sizes.
社団法人日本機械学会の論文
2002-07-25