宽带
材料科学
低频
谐振器
吸收(声学)
超材料吸收剂
声学
超材料
波长
次声
有限元法
光学
光电子学
物理
电信
可调谐超材料
计算机科学
复合材料
热力学
作者
Jiahao Xu,Xing-Feng Zhu,Di-Chao Chen,Qi Wei,Da‐Jian Wu
出处
期刊:Chinese Physics B
[IOP Publishing]
日期:2022-01-07
卷期号:31 (6): 064301-064301
被引量:8
标识
DOI:10.1088/1674-1056/ac4907
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.
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