矩形ダクトの対向する二辺に対称に設けた短い膨張空洞の共鳴特性(機械力学,計測,自動制御)

概要

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A short expansion chamber in a duct acts as a resonator muffler. The property of this type chamber has been precisely studied for circular duct-chamber cases by the authors. In this paper, short cambers are applied to rectangular ducts. The chamber consists of two rectangular branches symmetrically located on two opposite sides of the rectangular duct. The transmission property of the plane wave through the chamber is examined experimentally. When the chamber has very short axial length, the resonant frequency of it is determined as the same manner of a side-branch muffler with the open end correction which is estimated as : it becomes constant regardless of the chamber depth in rectangular chamber cases with the fixed axial length, while it is proportional to the depth in circular cases. When the chamber length is close to a half of the chamber height (that corresponds to the upper limit of resonator-type), the resonant frequency approaches the second cut-off of the chamber's resonant mode and exceeds it to some extent. This excess is comprehended with viewing the sound field contours calculated by the finite difference method.
社団法人日本機械学会の論文
2005-07-25