| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Broadband low-frequency acoustic absorber based on metaporous composite |
| Jia-Hao Xu(徐家豪)1, Xing-Feng Zhu(朱兴凤)1,2,†, Di-Chao Chen(陈帝超)1, Qi Wei(魏琦)1, and Da-Jian Wu(吴大建)1,‡ |
1 Jiangsu Key Laboratory on Opto-Electronic Technology, School of Physics and Technology, Nanjing Normal University, Nanjing 210023, China;
2 Key Laboratory of Modern Acoustics, School of Physics, Nanjing University, Nanjing 210093, China |
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Abstract 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.
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Received: 13 October 2021
Revised: 18 December 2021
Accepted manuscript online: 07 January 2022
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PACS:
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43.28.+h
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(Aeroacoustics and atmospheric sound)
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43.50.+y
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(Noise: its effects and control)
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43.90.+v
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(Other topics in acoustics)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 12174197, 11874222, and 12027808). |
Corresponding Authors:
Xing-Feng Zhu, Da-Jian Wu
E-mail: zhuxingfeng@njnu.edu.cn;wudajian@njnu.edu.cn
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Cite this article:
Jia-Hao Xu(徐家豪), Xing-Feng Zhu(朱兴凤), Di-Chao Chen(陈帝超), Qi Wei(魏琦), and Da-Jian Wu(吴大建) Broadband low-frequency acoustic absorber based on metaporous composite 2022 Chin. Phys. B 31 064301
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