5412 内部円筒を有する直方体空洞の共鳴効果による消音(G09-3 バイオディーゼル,G09 環境工学)

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  • 5412 Sound Attenuation using Resonance Effect in Rectangular Chamber with Internal Cylinder

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There are some commercial products of ventilator which have their own sound attenuation effect. The ventilator consists of a cylindrical fan unit, a rectangular box as an outer cover, and an orifice plate which faces the fan's inlet. The space surrounded by the outer cover and the orifice plate is supposed to act as a resonance box. In this research, the sound attenuation effect is experimentally verified using a model of rectangular chamber containing an internal cylinder placed in an infinite circular duct. While a simple rectangular chamber with short clearance in duct axis direction in a circular duct shows a typical resonator property, the another model of this research attached additional space between the box and the cylinder shows some peculiar properties as follows: (i) two resonance frequencies are obtained ; (ii) the first resonance frequency is lower than the one of the simple chamber ; (iii) the insertion loss at the first resonance frequency is greater than that of the simple one.

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