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Published on: December 3, 2016
Acoustic attenuation performance through a constricted duct improved by an annular resonator
Qipeng Feng1, Zhenyu Huang, Gaokun Yu
1Department of Marine Technology, Ocean University of China, Qingdao 266100, China fengqipeng@163.com, yellowshower@163.com, gkyu@ouc.edu.cn.
Abstract:
Acoustic attenuation performance through a constricted duct is greatly improved by an annular resonator. A method based on the Green's function for a semi-infinite circular duct is proposed to calculate the transmission loss, where the velocity distributions are assumed to be uniform at the constriction inlet/outlets and at the inlet to the annular resonator. From an analogous acoustical circuit, the effect of higher order evanescent modes on the quarter-wave resonance is described by an extra length. The improved acoustic attenuation performance is also confirmed by an experiment.
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