Design of broadband sound-absorbing metamaterial based on micro-slit folded space structure

被引：0
|
作者：
Chen Y. [1 ,2 ,3 ]
Xu C. [1 ,3 ]
Huang W. [2 ]
Xie L. [2 ]
Zhang J. [1 ,3 ]
Wang S. [1 ,3 ]
Sun W. [1 ,3 ]
机构：
[1] School of Mechanical and Vehicle Engineering, Bengbu University, Bengbu
[2] National Laboratory of Solid State Microstmctures, College of Engineering and Applied Sciences, Nanjing University, Nanjing
[3] Anhui Additive Manufacturing Engineering Research Center, School of Mechanical and Vehicle Engineering, Bengbu University, Bengbu
来源：
Zhendong yu Chongji/Journal of Vibration and Shock | 2024年 / 43卷 / 03期
关键词：
acoustic metamaterial; broadband sound absorption; folded space structure; micro-slit;
D O I：
10.13465/j.cnki.jvs.2024.03.020
中图分类号：
学科分类号：
摘要：
How to realize low-frequency broadband sound absorption and design sound absorbing metamaterials with sub-wavelength thickness is always a challenging task. Here, a micro-slit folded space metamaterial structure was proposed, and its structural theoretical analytical model and numerical simulation model were established to deeply study its acoustic characteristics and sound absorption mechanism. Effects of typical structural parameters on sound absorption characteristics were analyzed, and the possibility of realizing low-frequency broadband sound absorption was explored based on the above studies. The results showed that by adjusting thickness of folded space and number of folded channels, structure peak frequency can be adjusted in a larger frequency range without changing its nearly perfect sound absorption performance. Finally, a broadband sound-absorbing metamaterial was proposed. It was shown that the proposed metamaterial has a continuous and efficient sound-absorbing bandwidth with an average sound-absorbing coefficient of 0. 931 in the frequency range of 500 ~2 000 Hz; its structural thickness is 5. 68 cm which is only 1/12 of the wavelength corresponding to the lowest resonance frequency; its experimental results are good; the study results can provide a reference for realizing broadband sound absorption. © 2024 Chinese Vibration Engineering Society. All rights reserved.
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页码：171 / 178
页数：7
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