Study on Verification of sound refraction in porous material and investigation of insertion effect of porous material into light double leaf wall

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In the case of oblique sound incidence into porous media from the air, phenomenon of sound refraction has been guessed because sound velocity is lower in the porous media than that in the air. Main subject of this study was sound refraction, then the phenomenon wad verified by acoustical experiment on the oblique sound incidence into glass wool of typical porous material from the air. Moreover, establishment of quantitative grasping method of insertion effect of glass wool on the sound insulation of lightweight double leaf wall. It was confirmed that the insertion effects corresponded to the sound attenuation according to propagation length along the sound refracted path in porous material in double leaf wall.