期刊
PHYSICS LETTERS A
卷 383, 期 20, 页码 2361-2366出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2019.04.056
关键词
Acoustic metamaterial; Low-frequency absorption; Square split tubes; Helmholtz resonance absorption
资金
- Fundamental Research Funds for the Central Universities [2018CDXYWU0025, 2018CDJDWL0011]
- Key Technology Innovation Project in Key Industry of Chongqing [cstc2017zdcy-zdyf0338]
- Science and Technology Research Program of Chongqing Municipal Education Commission [KJQN201800101]
- Areas of Excellence Scheme from Research Grants Council (RGC) of Hong Kong [AOE/P-02/12]
- Sharing Fund of Chongqing University's Large-scale Equipment
The remarkable properties of acoustic metamaterials have attracted massive researches and applications, especially on low-frequency sound absorptions. Currently, most of the acoustic metamaterial absorbers employ resonances in plastic cavities, and their structural strengths are important in many circumstances, especially in harsh environment. However, studies of metamaterials including this point are very scarce. Here, we propose an acoustic metamaterial for low-frequency (<500 Hz) absorptions, composed of three nested square split tubes with inverted opening directions. The efficiency of the absorber is investigated both numerically and experimentally, and absorptions at the peeks are found to exceed 90% and the frequency can be effectively adjusted by tuning its geometric parameters. We further test its yield strength under compression and confirm its buckling behavior happens from the outmost layer. This tunable acoustic metamaterial with a fairly good mechanical strength may lead to broad applications in noise reduction. (C) 2019 Elsevier B.V. All rights reserved.
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