234 円形ダクトに設けた短い膨張空洞の共鳴特性 : ダクト径・空洞径・空洞長さと共鳴周波数との関係(一般 : 機器・プラントの静粛化)

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, the chamber's property changes remarkably, and starts to act as a resonator muffler. In this research, such resonant properties are studied comprehensively with various dimensions of the duct-chamber system and several mode waves incidence. The properties are simply summarized using the resonant frequency, which is almost decisively normalized by the chamber depth and the wavelength of the plane wave for an extremely short one ; and by the chamber diameter for a relatively long one with the transition length from acoustically short (resonant-type) to long (common-type). In these two special cases, sound pressure distributions in the duct system are indicated using the numerical calculation (FDM), in order to interpret short chambers' properties.
社団法人日本機械学会の論文
2001-06-05