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首页> 外文期刊>Applied Acoustics >Design, fabrication and sound absorption test of composite porous metamaterial with embedding Ⅰ-plates into porous polyurethane sponge
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Design, fabrication and sound absorption test of composite porous metamaterial with embedding Ⅰ-plates into porous polyurethane sponge

机译：复合多孔超材料的设计，制造和吸声试验，使Ⅰ平板嵌入多孔聚氨酯海绵

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摘要

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.
机译：如今，使用多孔聚氨酯海绵（PPS）非常常见，因为它的轻质特征和易于制造。然而，在许多情况下，传统PPS具有非常有限的吸收能力，由于波浪现象和/或不足的子波长吸收。在本文中，我们提出了一种复合多孔超材料（CPM），其包括具有嵌入式多层I板的多孔聚氨酯海绵，以减轻该问题。为了表征所提出的CPM的吸音系数，我们采用了Johnson-Champoux-Allard（JCA）模型，其中五个声学参数，即孔隙率，流动电阻率，曲折，粘性和热特征长度，由声学测试确定方法。数值和实验结果表明，与造影结构和纯多孔材料相比，CPM中PPS的吸声性能显着改善，利用了I板和慢波的局部声能量耗散的双重机制现象在结构内取消。最后，详细介绍和讨论了几何参数对平均声音吸收系数的影响。本文方案具有宽带和高效吸音器设计的潜在应用价值，为具有高吸收性能的新型声学功能装置的研究提供了参考。 （c）2020 elestvier有限公司保留所有权利。

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  • 来源
    《Applied Acoustics》 |2021年第4期|107845.1-107845.13|共13页
  • 作者

    Gao Nansha; Tang Liling; Deng Jie; Lu Kuan; Hou Hong; Chen Kean;

  • 作者单位

    Northwestern Polytech Univ Sch Marine Sci & Technol Key Lab Ocean Acoust & Sensing Xian 710072 Peoples R China;

    Northwestern Polytech Univ Sch Marine Sci & Technol Key Lab Ocean Acoust & Sensing Xian 710072 Peoples R China;

    Northwestern Polytech Univ Sch Marine Sci & Technol Key Lab Ocean Acoust & Sensing Xian 710072 Peoples R China;

    North Univ China Sch Mechatron Engn Taiyuan 030051 Peoples R China;

    Northwestern Polytech Univ Sch Marine Sci & Technol Key Lab Ocean Acoust & Sensing Xian 710072 Peoples R China;

    Northwestern Polytech Univ Sch Marine Sci & Technol Key Lab Ocean Acoust & Sensing Xian 710072 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Composite porous metamaterial; Porous polyurethane sponge; Broadband sound absorption; Sub-wavelength characteristic; Slow wave;

    机译：复合多孔超材料;多孔聚氨酯海绵;宽带吸声;子波长特性;慢波;

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