The SH0 wave manipulation in graded stubbed plates and its application to wave focusing and frequency separation
The SH0 wave manipulation in graded stubbed plates and its application to wave focusing and frequency separation
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DOI：
10.1088/1361-665x/ab3ef0
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发表时间：
2019-10
影响因子：
4.1
通讯作者：
Peng Li;S. Biwa
中科院分区：
文献类型：
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作者：
Peng Li;S. Biwa
在这项研究中，一种方法来人工控制基本剪切水平波（SH 0）在弹性板的传播，提出了使用存根与空间梯度的高度，和两个新的现象，波聚焦和低通滤波，实现。在此基础上，对具有六边形短截线的铝板进行了能带结构分析，建立了波速、带隙和短截线高度之间的关系。在此基础上，利用多个高度空间渐变的短截线人工设计了基于SH0波的Luneburg和麦克斯韦鱼眼透镜以及低通滤波器。结果表明，这两种透镜都具有良好的聚焦能力，其聚焦尺寸小于波长。此外，它们可以在设计频率附近的有限带宽下工作。在时域和频域仿真中也已经揭示，具有较低频率的SH 0波在进入低通滤波器时可以传播较长的距离，这证明了其频率分离能力。
In this study, a methodology to artificially control the propagation of fundamental shear horizontal (SH0) waves in elastic plates is proposed using stubs with spatially graded height, and two novel phenomena, wave focusing and low-pass wave filtering, are realized. As a basis for this, the band structure analysis is carried out for an aluminum plate with hexagonally arranged stubs, and the relationships between the wave velocity, the band gap and the stub height are established. Based on these results, omni-directional SH0 wave-based Luneburg and Maxwell fish-eye lenses, as well as low-pass wave filter, are designed artificially using multiple stubs with spatially graded heights. It is demonstrated that both of the lenses exhibit good focusing ability, with the focusing size smaller than the wavelength. Additionally, they can work with a finite bandwidth around the design frequency. It has also been revealed both in time and frequency domain simulations that the SH0 wave with a lower frequency can travel over a longer distance when it enters the low-pass wave filter, which demonstrates its frequency separation capability.