中国物理B ›› 2022, Vol. 31 ›› Issue (6): 64301-064301.doi: 10.1088/1674-1056/ac4907

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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. 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
  • 收稿日期:2021-10-13 修回日期:2021-12-18 接受日期:2022-01-07 出版日期:2022-05-17 发布日期:2022-06-07
  • 通讯作者: Xing-Feng Zhu, Da-Jian Wu E-mail:zhuxingfeng@njnu.edu.cn;wudajian@njnu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12174197, 11874222, and 12027808).

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. 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
  • Received:2021-10-13 Revised:2021-12-18 Accepted:2022-01-07 Online:2022-05-17 Published:2022-06-07
  • Contact: Xing-Feng Zhu, Da-Jian Wu E-mail:zhuxingfeng@njnu.edu.cn;wudajian@njnu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 12174197, 11874222, and 12027808).

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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.

关键词: acoustic metamaterial, low-frequency acoustic absorber, broadband, metaporous

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.

Key words: acoustic metamaterial, low-frequency acoustic absorber, broadband, metaporous

中图分类号:  (Aeroacoustics and atmospheric sound)

  • 43.28.+h
43.50.+y (Noise: its effects and control) 43.90.+v (Other topics in acoustics)