Broadband low-frequency acoustic absorber based on metaporous composite

被引:8
作者
Xu, Jia-Hao [1 ]
Zhu, Xing-Feng [1 ,2 ]
Chen, Di-Chao [1 ]
Wei, Qi [1 ]
Wu, Da-Jian [1 ]
机构
[1] Nanjing Normal Univ, Sch Phys & Technol, Jiangsu Key Lab Optoelect Technol, Nanjing 210023, Peoples R China
[2] Nanjing Univ, Sch Phys, Key Lab Modern Acoust, Nanjing 210093, Peoples R China
基金
中国国家自然科学基金;
关键词
acoustic metamaterial; low-frequency acoustic absorber; broadband; metaporous; FRAME POROUS LAYER; ABSORPTION; INCLUSIONS; SOUND;
D O I
10.1088/1674-1056/ac4907
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Broadband absorption of low-frequency sound waves via a deep subwavelength structure is of great and ongoing interest in research and engineering. Here, we numerically and experimentally present a design of a broadband low-frequency absorber based on an acoustic metaporous composite (AMC). The AMC absorber is constructed by embedding a single metamaterial resonator into a porous layer. The finite element simulations show that a high absorption (absorptance A > 0.8) can be achieved within a broad frequency range (from 290 Hz to 1074 Hz), while the thickness of AMC is 1/13 of the corresponding wavelength at 290 Hz. The broadband and high-efficiency performances of the absorber are attributed to the coupling between the two resonant absorptions and the trapped mode. The numerical simulations and experimental results are obtained to be in good agreement with each other. Moreover, the high broadband absorption can be maintained under random incident acoustic waves. The proposed absorber provides potential applications in low-frequency noise reduction especially when limited space is demanded.
引用
收藏
页数:6
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