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A lightweight vibro-acoustic metamaterial demonstrator: Numerical and experimental investigation

机译：轻型振动声超材料演示器：数值和实验研究

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摘要

In recent years metamaterials gained a lot of attention due to their superior noise and vibration insulation properties, be it at least in some targeted and tuneable frequency ranges, referred to as stopbands. These are frequency zones for which free wave propagation is prevented throughout the metamaterial, resulting in frequency zones of pronounced wave attenuation. Metamaterials are achieved due to addition of an, often periodic, grid of resonant structures to a host material or structure. The interaction between resonant inclusions and host structure can lead to a performance which is superior to the ones of any of the constituent materials. A key element in this concept is that waves can be affected by incorporating structural resonant elements of sub-wavelength sizes, i.e. features that are actually smaller than the wavelength of the waves to be affected. This paves the way towards compact and light vibro-acoustic solutions in the lower frequency ranges. This paper discusses the numerical design and experimental validation of acoustic insulation based on the concept of metamaterials: a hollow core periodic sandwich structure with added local resonant structures. In order to investigate the sensitivity to specific parameters in the metamaterial design and the robustness of the design, a set of variations on the nominal design are investigated. The stop bands are numerically predicted through unit cell modelling after which a full vibro-acoustic finite element model is applied to predict the insertion loss of the demonstrator. The results of these analyses are compared with measurements; both indicate that this metamaterials concept can be applied to combine light weight compact volume and good acoustic behaviour.
机译：近年来，超材料由于其优异的噪声和振动隔离特性而受到了广泛的关注，至少在某些目标频率和可调频率范围内被称为阻带。这些是在整个超材料中阻止自由波传播的频率区域，从而导致明显的波衰减的频率区域。超材料是由于将共振结构的网格（通常是周期性的）添加到主体材料或结构而实现的。共振夹杂物与主体结构之间的相互作用可导致性能优于任何一种组成材料。该概念中的关键要素是可以通过合并亚波长尺寸的结构谐振元件来影响波，即实际上小于要受影响的波的波长的特征。这为在低频范围内实现紧凑，轻巧的振动声解决方案铺平了道路。本文讨论了基于超材料概念的隔音设计的数值设计和实验验证：一种带有局部共振结构的空心周期夹心结构。为了研究超材料设计中对特定参数的敏感性和设计的鲁棒性，研究了名义设计的一组变化。通过晶胞建模对阻带进行数值预测，然后通过完整的振动声有限元模型来预测演示器的插入损耗。将这些分析的结果与测量结果进行比较；两者都表明，该超材料概念可以应用于将轻巧紧凑的体积和良好的声学性能结合起来。

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  • 来源
    《Mechanical systems and signal processing》 |2016年第3期|853-880|共28页
  • 作者

    C. Claeys; E. Deckers; B. Pluymers; W. Desmet;

  • 作者单位

    KU Leuven, Department of Mechanical Engineering, Celestijnenlaan 300 B, B-3001 Heverlee, Belgium;

    KU Leuven, Department of Mechanical Engineering, Celestijnenlaan 300 B, B-3001 Heverlee, Belgium;

    KU Leuven, Department of Mechanical Engineering, Celestijnenlaan 300 B, B-3001 Heverlee, Belgium;

    KU Leuven, Department of Mechanical Engineering, Celestijnenlaan 300 B, B-3001 Heverlee, Belgium;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Metamaterials; Acoustic insulation; Insertion loss; Lightweight;

    机译：超材料;隔音材料;插入损耗;轻巧的;

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