110 Development of Measuring Method for Acoustic Transfer Functions by Reciprocity Technique : Application to Acoustical Enclosures

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  • 110 相反定理を用いた音響伝達関数計測法の開発 : 防音エンクロージャへの適用(振動・音響の評価技術,騒音・振動改善技術)

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This report deals with an experimental method for estimating sound pressure level from the acoustical enclosures. By using the acoustic reciprocity technique, we measured the acoustic transfer function for sound radiation from the acoustic enclosures. Especially in case of the opening, we calculated the volume velocity by using the measured pressure level and theoretical radiation impedance. Eventually, sound pressure level from the opening are estimated by using the measured acoustic transfer functions and the calculated volume velocity. The application of this technique on the white noise sound source and the roots blower sound source is demonstrated. The comparisons were made between predicting results using the reciprocal technique and directly measuring results. Agreement is fairly good and it suggests that this method can be used to evaluate the sound pressure level from the opening of the acoustical enclosures.

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