Reflective elastic metasurface for flexural wave based on surface impedance model
Reflective elastic metasurface for flexural wave based on surface impedance model
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基于表面阻抗模型的反射弹性超表面弯曲波
DOI：
10.1016/j.ijmecsci.2021.106859
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发表时间：
2021-12
影响因子：
7.3
通讯作者：
Liang Xu
中科院分区：
文献类型：
--
作者：
Ruan Yongdu;Liang Xu
受声学超颖表面在实现波操纵方面的最新进展的启发，提出了一种表面阻抗匹配的方法，而不是广义Snell定律来设计反射弹性超颖表面，以重定向薄板中的弯曲波，而没有太多的损失。所设计的弹性超颖表面由规则排列的结构梁简单地制造，允许几乎任意控制反射波，包括非常反射、正入射和负反射。结果表明，所设计的超颖表面具有较高的反射波重定向精度，同时有效地抑制了其他方向的散射波。我们还展示了弹性超颖表面与自由和固定的边界条件，都显示电磁和声学的异常反射响应的类比。基于表面阻抗匹配方法，反射波重定向的理论预测与数值模拟和实验结果一致，并且我们认为非共振反射弹性元表面的最小特征尺度局限于输入阻抗的第一周期。这一工作为弹性超表面的设计提供了一种有效的策略，对实现弯曲波操纵功能具有潜在的应用价值。
Inspired by the recent advance of acoustic metasurface in achieving wave manipulation, a surface impedance matched method rather than Generalized Snell's Law for designing a reflective elastic metasurface is presented to redirect the flexural waves without much loss in thin plates. The designed elastic metasurface that is simply fabricated by regularly arranged structural beams allows nearly arbitrary control of reflected waves, including extraordinary reflection, normal incidence and negative reflection. Obtained results show that the designed metasurface has a high accuracy of redirecting reflected waves into desired way and simultaneously the scattering waves in other directions are efficiently suppressed. We also demonstrate the elastic metasurfaces with free and fixed boundary conditions which all show electromagnetic and acoustic analogies of anomalous reflection response. Based on the surface impedance matched method, the theoretical prediction of redirecting reflection waves has an agreement with numerical simulation and experiments, and we think that the minimum characteristic scale of a non-resonant reflective elastic metasurface is confined to the first period of input impedance. This work provides an effective strategy for designing an elastic metasurface, and it is potentially useful for the functionalities of flexural wave manipulation.
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