背後空気層を有する多孔板の吸音特性に及ぼす微小噴流の影響

抄録

The present paper focuses on the effect of air jets on acoustic absorption characteristics of perforated plate with cavity. We discussed the influences of flow rate, background back space, plate thickness, opening ratio of small holes, and hole diameter of perforated plate on acoustic absorption characteristics theoretically. As the flow rate increased through small holes, the peak level of acoustic absorption coefficient and that of high frequency band increased. As the background back space of perforated plate decreased, the peak frequency of acoustic absorption coefficient increased. As the thickness of perforated plate decreased, the peak frequency increased. The theoretical results showed the same tendencies as the experimental results.