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）

概要

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The acoustic characteristics of lined ducts, especially the attenuation per unit length of lined ducts have been obtained by various simple prediction methods such as the Sabines Equation, the Bruels Equation and the Doellings Equation. However the availability of these methods has not been clarified yet. This paper describes the experimental method and results on characteristics of the lined suct. The comparison between the results of predicted attenuation and experimental one was carried out in order to clarify the usable frequency range of these prediction methods and its availability of each prediction method. As a result, it was clarified that the applicable frequency region of these methods became clear and the Doellings method was the most useful in the fiber type acoustic absorbent.