A study on low frequency sound absorption performance of structure embedded local resonant scatters

被引：0
|
作者：
Luo Y. [1 ]
Lou J. [1 ]
Zhang Y. [1 ]
机构：
[1] College of Naval Architecture and Ocean Engineering, Naval University of Engineering, Wuhan
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2022年 / 41卷 / 08期
关键词：
Finite element method; Local resonant; Low-frequency sound absorption; Scatters; Underwater sound-absorbing structure;
D O I：
10.13465/j.cnki.jvs.2022.08.010
中图分类号：
学科分类号：
摘要：
A simplified finite element method was established to calculate the acoustic characteristics for the periodic axisymmetric local resonant scatter structure. The influence of cross-section shape, core material, and coating thickness on sound absorption was discussed. The sound absorption mechanism was analyzed through the displacement and energy dissipation density fields. It shows that the sound absorption peaks are caused by the resonances of the scatter. The first and second sound absorption peaks are closely related to the resonance of core and coating, respectively. The average sound absorption coefficient was optimized by the genetic algorithm while considering the variable cross-section parameters. The optimized results show the variable cross-section scatter can excite more matrix movement at the sound absorption peaks, promoting more wave mode conversion, which is conducive for energy dissipation and improving the sound absorption. This work provides a new idea for low frequency broadband sound absorption structure design. © 2022, Editorial Office of Journal of Vibration and Shock. All right reserved.
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页码：86 / 92and115
相关论文
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