Design, fabrication and sound absorption test of composite porous metamaterial with embedding I-plates into porous polyurethane sponge
Design, fabrication and sound absorption test of composite porous metamaterial with embedding I-plates into porous polyurethane sponge
复制标题
多孔聚氨酯海绵嵌入工字板复合多孔超材料的设计、制备及吸声测试
DOI：
10.1016/j.apacoust.2020.107845
复制
发表时间：
2021-04-01
影响因子：
3.4
通讯作者：
Chen, Kean
中科院分区：
文献类型：
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作者：
Gao, Nansha;Tang, Liling;Chen, Kean
如今，由于其重量轻且易于制造，多孔聚氨酯海绵（PPS）的使用在吸声方面非常普遍。然而，在许多情况下，由于慢波现象和/或亚波长吸声不足，传统 PPS 的吸声能力非常有限。在本文中，我们提出了一种复合多孔超材料（CPM），由嵌入多层 I 板的多孔聚氨酯海绵组成，以缓解这一问题。为了表征所提出的 CPM 的吸声系数，我们采用 Johnson-Champoux-Allard (JCA) 模型，其中通过声学测试方法确定五个声学参数，即孔隙率、流阻率、弯曲度、粘性和热特征长度。数值和实验结果表明，与对比结构和纯多孔材料相比，CPM中PPS的吸声性能显着提高，利用了I板局部声能耗散和结构内部慢波现象消除的双重机制。最后，详细讨论了几何参数对平均吸声系数的影响。本文方案对于宽带高效吸声体的设计具有潜在的应用价值，为新型高吸声功能器件的研究提供参考。 (C) 2020 Elsevier Ltd. 保留所有权利。
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.