An Experimental Investigation of Sound Absorbing Plate in SVU

A new model of square SVU (Soundproofing ventilation unit) having an inlet and an outlet which is located on the crossed right angle face is proposed in this work. The outlet position was improved by placing it on the larger face of the SVU in order to increases the ventilation effect. In addition, the outlet is located in the center of the SVU to avoid the resonance of plane wave sound pressure. The sound propagating through SVU is a combination of a plane wave and the higher order mode wave. To maximize the soundproof capability it is necessary to reduce sound pressure levels or prevent the generation of those waves in any technique. In present work, the introduction of sound absorbing plate inside the SVU is considered. A series of experimental based on the Insertion Loss measurement method were performed to verify the actual sound attenuation characteristics of SVU.