Wide band-gap seismic metastructures
Wide band-gap seismic metastructures
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DOI：
10.1016/j.eml.2015.05.004
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发表时间：
2015-09-01
影响因子：
4.7
通讯作者：
Daraio, C.
中科院分区：
文献类型：
--
作者：
Kroedel, S.;Thome, N.;Daraio, C.
超材料利用局部共振来反射波长远高于材料结构特征尺寸的声学信号。这允许获得呈现低频（尽管窄）带隙的材料或用于光学和声学隐身的设备。在这项工作中，我们建议使用一个阵列的共振结构（这里称为“元结构”）埋在敏感建筑物周围，以控制地震波的传播。这些地震元结构由圆柱形管阵列组成，其中包含由软轴承悬挂的谐振器。为了获得宽带衰减特性，阵列中的每个谐振器被设计成呈现不同的本征频率。我们研究这些系统的响应，使用数值分析和缩放（1：30）的实验。我们的目标是次声区（1-10 Hz）的波浪缓解，这是一个与大型建筑物保护相关的频率范围。（）2015爱思唯尔有限公司版权所有。
Metamaterials exploit local resonances to reflect acoustic signals with wavelengths well above the characteristic size of the material's structure. This has allowed obtaining materials that present low-frequency (albeit narrow) band gaps or devices for optical and acoustic cloaking. In this work, we propose to use an array of resonating structures (herein termed a "metastructure'') buried around sensitive buildings to control the propagation of seismic waves. These seismic metastructures consist of arrays of cylindrical tubes containing a resonator suspended by soft bearings. To obtain broadband attenuation characteristics, each resonator in the array is designed to exhibit a different eigenfrequency. We study the response of these systems using numerical analysis and scaled (1: 30) experiments. We target wave mitigation in the infrasound regime (1-10 Hz), a range of frequencies relevant for the protection of large buildings. () 2015 Elsevier Ltd. All rights reserved.