ダクト軸から偏心したスリット状膨張空洞の消音効果

概要

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A slit, which is a duct expansion with very short axial length, acts as a resonator muffler. Its resonant frequency almost depends on the slit depth, if the slit center coincides with the duct axis. Hence, it is expected that the resonance characteristic changes using a slit with non-uniform depth in the circumferential direction. In this study, transmission coefficient of the slit eccentric to the duct axis was measured with various slit-diameter, width and eccentricity, and with the plane wave or the (1, 1) mode wave incidence. As a result, it became obvious that the eccentric slit has two different resonant frequencies. Especially the lower one is peculiar to the eccentric slit and considerably lower than the resonant frequency of the concentric slit with same diameter. As the case may be, the eccentric slit seems to be useful as a sound attenuator.
社団法人日本機械学会の論文
1999-08-25