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首页> 外文期刊>International journal of mechanics and materials in design >Tunable ultralow frequency wave attenuations in one-dimensional quasi-zero-stiffness metamaterial
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Tunable ultralow frequency wave attenuations in one-dimensional quasi-zero-stiffness metamaterial

机译：一维准零刚度超材料中的可调谐超级频率波衰减

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摘要

Metamaterials are artificially structured materials that enable wave attenuation in band gaps. However, opening an ultralow-frequency band gap is still a challenge, since it is hard to realize near-zero stiffness in a traditional way. In this paper, a one-dimensional tunable quasi-zero-stiffness (QZS) metamaterial is engineered for ultralow-frequency (about a few tens Hertz) wave attenuation. Design optimization on the configuration of this new metamaterial is conducted to achieve quasi-zero stiffness. The dispersion relation is derived theoretically based on a lumped diatomic chain model, and then the band structure is revealed. The characteristics of longitudinal wave propagation in the metamaterial are studied by both numerical analyses and FE simulations, which are also validated by experimental tests. The results indicate that the stiffness is deformation-related, and the band gap can be tuned substantially by just changing the pre-compression. Therefore, the quasi-zero stiffness and then the ultralow-frequency band gap can be fulfilled by pre-compressing the metamaterial properly.
机译：超材料是人工结构化材料，使波浪衰减能够在带间隙中。然而，打开超级频带隙仍然是一个挑战，因为它很难以传统方式实现接近零刚度。在本文中，为超级频率（约几十赫兹）波衰减设计了一维调节准零刚度（QZS）超零度。设计优化本新的超材料的配置，以实现准零刚度。基于一组抗锯齿链模型理论地推导出分散关系，然后揭示带结构。通过数值分析和FE模拟研究了超材料中纵向波传播的特征，这些分析和FE模拟也通过实验测试验证。结果表明刚度与变形有关，并且可以通过改变预压缩来基本上基本上调谐带隙。因此，通过适当地预先压缩超级材料，可以满足准零刚度，然后是超级频带隙。

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  • 作者

    Zhou Jiaxi; Pan Hongbin; Cai Changqi; Xu Daolin;

  • 作者单位

    State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Peoples R China|Hunan Univ Coll Mech & Vehicle Engn Changsha 410082 Peoples R China;

    State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Peoples R China|Hunan Univ Coll Mech & Vehicle Engn Changsha 410082 Peoples R China;

    State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Peoples R China|Hunan Univ Coll Mech & Vehicle Engn Changsha 410082 Peoples R China;

    State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Peoples R China|Hunan Univ Coll Mech & Vehicle Engn Changsha 410082 Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Quasi-zero stiffness; Metamaterials; Ultra-low frequency; Band gap; Wave attenuation;

    机译：准零刚度;超材料;超低频率;带隙;波浪衰减;

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