Abstract
The noise and vibration control are the one of important issues. A sound insulation cover which covers a sound source is very useful for the noise reduction. The purpose of the present study is to investigate the acoustic characteristic of a sound insulation cover using acoustic/structure coupled analysis. To verify the numerical results, experimental measurement of sound pressure level was also carried out. It is clearly that sound pressure distributions inside and outside cover changed obviously according to the input frequency of a sound source. Several downward peaks of the sound insulation were observed and these peaks were depended on the natural frequency of the insulation cover. Numerical and eχperimental results were consistent qualitatively.
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