Abstract
Noise and vibration control are the one of important issues for engineering. A sound insulation cover which envelops a sound source is very useful for the noise reduction. When large noise and high temperature heat are emitted from the sound source, we have to consider the heat cooling as well as the noise reduction. The purpose of the present study is to investigate the acoustic characteristic of a sound insulation cover with and without a small hole using acoustic/structure coupled analysis. The effect of hole size and position were also investigated. Although a lot of sound leaked from a large size hole, a small size hole hardly influenced the sound insulation performance of the cover. It is clearly that sound pressure distributions around the cover changed obviously according to the input frequency of a sound source.
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