1220 ダクト内部の音場に及ぼす矩形スリットの影響

概要

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The sound field in a rectangular duct with slits is computed by a finite difference method and the transmission characteristic is measured. The slits are duct expansions located on two opposite side of a duct with short axial length. Both the computed sound attenuation and the measured one occurred at a specific frequency, that is, resonance frequency. The resonance frequency for the slits of the same depth almost coincides with the second order cut-off frequency in the direction of slit depth. The resonance frequency becomes to be lower according to the deeper depth of slit. The resonance frequency for the slits of different depth is close to the resonance frequency of the slits with the averaged depth. The computed results are in good agreement with experimental data.
社団法人日本機械学会の論文
2002-09-20