FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Broadband Acoustic Transmission Enhancement through a Structured Stiff Plate with Locally Resonant Elements |
LI Yong1,2, LIANG Bin1,2, ZOU Xin-Ye1, CHENG Jian-Chun1,2** |
1Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Nanjing University, Nanjing 210093 2State Key Laboratory of Acoustics, Chinese Academy of Sciences, Beijing 100190
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Cite this article: |
LI Yong, LIANG Bin, ZOU Xin-Ye et al 2012 Chin. Phys. Lett. 29 114301 |
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Abstract Broadband acoustic transmission enhancement (ATE) is realized for a periodically structured stiff plate without any opening that is conventionally thought to be only capable of supporting narrowband ATE, by introducing locally resonant (LR) elements. This exotic phenomenon is interpreted by analyzing the vibration pattern of the structure-induced LR modes, and is well modeled by a simple "spring-mass" system which reveals the contribution of the LR effect to the important broadband performance. Our findings should help to better understand the physical mechanism of ATE and may have potential impact on ultrasonic applications such as broadband acoustic filters or compact acoustic devices in subwavelength scale.
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Received: 09 April 2012
Published: 28 November 2012
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PACS: |
43.20.+g
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(General linear acoustics)
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43.35.+d
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(Ultrasonics, quantum acoustics, and physical effects of sound)
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42.79.Dj
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(Gratings)
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