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首页> 外文期刊>Applied Acoustics >Acoustical siphon effect for reducing the thickness in membrane-type metamaterials with low-frequency broadband absorption
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Acoustical siphon effect for reducing the thickness in membrane-type metamaterials with low-frequency broadband absorption

机译：声学虹吸效应可降低具有低频宽带吸收能力的膜型超材料的厚度

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摘要

Acoustical siphon effect in membrane-type metamaterials for low-frequency broadband absorption is proposed, whose physical mechanism is further investigated by the theoretical analysis and finite element (FE) simulation. This kind of membrane-type metamaterials consists of multiple detuned units, each of which is composed of two aluminum platelets fasten on a piece of silicone membrane above an air cavity. For the multi-unit metamaterial illuminated by an incident plane wave with certain frequency, there exists a certain unit at resonance with maximum acoustic absorption, and meanwhile other units nearly keep static due to the narrow absorption peak of the resonant unit. Therefore, almost the whole incident energy can be forced to flow to this resonant unit resulting in a much enhanced vibration and a reduced acoustic impedance that could be more matchable to air medium, and thus much more acoustic absorption appears without increasing the unit thickness, which is called acoustical siphon effect of the unit. On this basis, by precisely designing the acoustical siphon effect of each unit, the broadband absorption can be obtained by a subwavelength six-unit sample in the low-frequency range of 400-650 Hz with the maximum absorption coefficient of almost 100% and the average absorption coefficient of about 80%, which is then verified by the corresponding experiment. The results presented here would offer a new approach for the metamaterials design for low-frequency broadband sound absorption and could have potential applications in controlling vibration and noise. (C) 2018 Elsevier Ltd. All rights reserved.
机译：提出了膜型超材料中低频虹吸的声虹吸效应，并通过理论分析和有限元模拟进一步研究了其物理机理。这种膜型超材料由多个失谐单元组成，每个失谐单元均由两个铝片组成，这些铝片固定在空气腔上方的一块硅胶膜上。对于以一定频率的入射平面波照射的多单元超材料，在共振时存在某个单元，具有最大的声吸收，同时由于共振单元的吸收峰较窄，其他单元几乎保持静态。因此，几乎所有入射能量都可以被迫流到该谐振单元，从而导致振动大大增强，并且声阻抗降低，从而更适合空气介质，从而在不增加单元厚度的情况下出现了更多的声吸收现象，从而增加了单元厚度。称为单元的虹吸效果。在此基础上，通过精确设计每个单元的声学虹吸效果，可以通过在400-650 Hz低频范围内的亚波长六单元样本获得宽带吸收，最大吸收系数几乎为100％，并且平均吸收系数约为80％，然后通过相应的实验进行验证。本文介绍的结果将为超材料的低频宽带吸声提供一种新的方法，并且在控制振动和噪声方面可能具有潜在的应用。 （C）2018 Elsevier Ltd.保留所有权利。

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  • 来源
    《Applied Acoustics》 |2019年第5期|1-8|共8页
  • 作者

    Liu Chong Rui; Wu Jiu Hui; Lu Kuan; Zhao Zi Ting; Huang Zhen;

  • 作者单位

    Xi An Jiao Tong Univ, Sch Mech Engn, Xian 710049, Shaanxi, Peoples R China|Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, Sch Mech Engn, Xian 710049, Shaanxi, Peoples R China|Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, Sch Mech Engn, Xian 710049, Shaanxi, Peoples R China|Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, Sch Mech Engn, Xian 710049, Shaanxi, Peoples R China|Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Shaanxi, Peoples R China;

    Xi An Jiao Tong Univ, Sch Mech Engn, Xian 710049, Shaanxi, Peoples R China|Xi An Jiao Tong Univ, State Key Lab Strength & Vibrat Mech Struct, Xian 710049, Shaanxi, 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

    Membrane-type metamaterials; Acoustical siphon effect; Low-frequency broadband sound absorption; Absorption coefficient; Acoustic impedance;

    机译：膜型超材料声学虹吸效应低频宽带吸声吸收系数声阻抗;

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