104 吸音ダクトの音響特性に関する研究 : 種々の簡易予測法の適用性について(新しい騒音・振動改善技術(2),騒音・振動評価・改善技術)

概要

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Lined ducts have often been used to reduce the noises generated in a large wind tunnel and from an engine. Especially, the noise reduction has been strongly required in the hospital, the office and the rail vehicle in accompany with the spread of the air conditioning. The acoustic characteristics of lined ducts, especially the attenuation per unit length of lined duct has been obtained by various simple prediction methods such as the Sabine's Equation, the Bruel's Equation and the Doelling's Equation. However the availability of these methods have not been clarified yet Then, this paper describes comparisons between the results of the predicted attenuation and experimental results. As a result, it was clarified that the applicable frequency region of these methods were clear and the Doelling s method was the most useful.
2007-07-18