Steering and focusing of fundamental shear horizontal guided waves in plates by using multiple-strip metasurfaces
Steering and focusing of fundamental shear horizontal guided waves in plates by using multiple-strip metasurfaces
复制标题
使用多带超表面对板中基本剪切水平导波进行引导和聚焦
DOI：
10.1209/0295-5075/127/46004
复制
发表时间：
2019-08
期刊：
影响因子：
1.8
通讯作者：
Li Faxin
中科院分区：
文献类型：
--
作者：
Qiu Hao;Chen Mingtong;Huan Qiang;Li Faxin
我们提出了一种由多个不同宽度的平行条带组成的元表面，它可以引导和聚焦板中的基本剪切水平波（SH0）。首先，计算了不同宽度条带中准SH0波的群速度。在此基础上，设计了一种多条带超颖表面，并通过在铝板上进行全厚度开槽实现了该超颖表面。有限元模拟表明，该超表面可以引导SH0波到一个指定的角度。随后，进行了实验，其中厚度剪切（d15）压电条作为SH 0波的激励器和接收器，实验结果很好地再现了模拟结果。最后，设计了另一个多条带超颖表面，以将SH0波聚焦在指定点。仿真和实验结果验证了所提出的设计。该工作可为SH波超颖面的设计提供指导。
We proposed a metasurface consisting of multiple parallel strips with varied widths which can steer and focus the fundamental shear horizontal (SH0) wave in plates. Firstly, the group velocity of the quasi-SH0 wave in different-width strips was calculated. Then, a multiple-strip metasurface was designed which was realized by through-thickness grooving in an aluminum plate. Finite-element simulations show that this metasurface can steer the SH0 wave to a prescribed angle. Later, experiments were conducted in which thickness-shear (d15) piezoelectric strips were used as SH0 wave exciters and receivers, and experimental results well reproduced the simulation results. Finally, another multiple-strip metasurface was designed to focus the SH0 wave at a designated point. Both simulations and experiments were conducted, and results validated the proposed design. This work may provide guidance for the design of SH wave metasurfaces.