Acoustic absorbers at low frequency based on split-tube metamaterials |
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Authors: | Peng Wu Qianjin Mu Xiaoxiao Wu Li Wang Xin Li Yuqing Zhou Shuxia Wang Yingzhou Huang Weijia Wen |
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Institution: | 1. Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing, 400044, China;2. Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China;3. Chongqing University, Industrial Technology Research Institute, Chongqing, 400044, China;4. Materials Genome Institute, Shanghai University, Shanghai, 200444, China |
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Abstract: | 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. |
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Keywords: | Corresponding author at: Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials College of Physics Chongqing University Chongqing 400044 China Acoustic metamaterial Low-frequency absorption Square split tubes Helmholtz resonance absorption |
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