Journal
APPLIED ACOUSTICS
Volume 175, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.apacoust.2020.107845
Keywords
Composite porous metamaterial; Porous polyurethane sponge; Broadband sound absorption; Sub-wavelength characteristic; Slow wave
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Funding
- Aeronautical Science Foundation of China [20181553015]
- Foundation of Shaanxi Educational Committee [2018BSHYDZZ03]
- National Natural Science Foundation of China [11704314]
- China Postdoctoral Science Foundation [2018M631194]
- National Science Foundation of China [11902260]
- Fundamental Research Funds for the Central Universities [3102019HHZY03001]
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This paper proposes a composite porous metamaterial (CPM) consisting of porous polyurethane sponge with embedded multi-layer I-plates to improve the sound absorption performance. By using the Johnson-Champoux-Allard (JCA) model, the sound absorption coefficient of the CPM is characterized, showing significantly improved performance compared to traditional PPS. The study also discusses the effects of geometric parameters on the average sound absorption coefficient, providing valuable insights for designing broadband and efficient sound absorbers.
Nowadays the use of porous polyurethane sponge (PPS) is very common for sound absorption, thanks to its light-weight feature and easy fabrication. However, in many circumstances the traditional PPS has very limited absorption capabilities, due to the slow wave phenomenon and/or to insufficient sub-wavelength sound absorption. In this paper, we propose a composite porous metamaterial (CPM) consisting in a porous polyurethane sponge with embedded multi-layer I-plates to mitigate this problem. To characterize the sound absorption coefficient of the proposed CPM, we resort to the Johnson-Champoux-Allard (JCA) model, where five acoustic parameters, namely porosity, flow resistivity, tortuosity, viscous, and thermal characteristic lengths, are determined by acoustic test methods. Numerical and experimental results show that the sound absorption performance of PPS in the CPM is remarkably improved, compared to a contrast structure and a pure porous material, taking advantage of a twofold mechanism of local acoustic energy dissipation of the I-plates and the slow wave phenomenon cancellation inside the structure. Finally, the effects of the geometrical parameters on average sound absorption coefficient are presented and discussed in detail. The scheme of this paper possesses potential application value for the design of broadband and efficient sound absorbers, providing a reference for researches of new acoustic functional devices with high absorption performances. (C) 2020 Elsevier Ltd. All rights reserved.
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