Journal
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Volume 117, Issue -, Pages 138-156Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2018.07.046
Keywords
Metamaterial; Micro-perforated panel; Absorption improvement; Stop band; Effective medium method
Categories
Funding
- Fundamental Research Funds for the Central Universities [0300-G2018KY0307]
- National Natural Science Foundation of China [11772248, U1737107, 11761131003]
- DFG [ZH15/32-1]
- Shaanxi Foundation for Selected Overseas Chinese [2017025]
- China Scholarship Council
- Research Foundation - Flanders [11ZH817N, 12D2614N]
- KU Leuven Research Fund
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To further improve the sound absorption enhancement of flexible micro-perforated panels (FMPPs), a new sort of perforated sound absorbers - metamaterial-based micro-perforated panels (MMPPs) - is proposed by combining a micro-perforated host panel and local resonators (LRs) attached on a sub-wavelength scale, targeting the flexural waves. Theoretical and numerical models show that MMPPs are able to further enhance sound absorption in a wide frequency range. The theoretical model is developed based on the effective medium method as the structural wavelength in the host panel is much larger than the distance between the LRs, and the full simulation model, including viscothermal effects, is conducted by utilizing multi-physical coupling integrated in COMSOL. Besides, a structural finite element unit cell method is used to evaluate the stop band behavior of the MMPP. Good agreement is achieved between the theoretically predicted acoustical properties and the simulation results for both conventional FMPPs and the proposed MMPPs, validating the numerical and theoretical models. Both models reveal that the sound absorption enhancement of the MMPP stems from the resulting acoustic surface impedance improvement, caused by the sub-wavelength attached local resonances. The effect of key properties of the LRs (i.e. mass, damping and multiple resonances) on the sound absorption performance of MMPPs is then analyzed by applying the theoretical model and effective frequency-adjustability of the absorption enhancement performance is found. The proposed MMPP shows great potential for the noise reduction industry. (C) 2018 Elsevier Ltd. All rights reserved.
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