A piezo-metastructure with bistable circuit shunts for adaptive nonreciprocal wave transmission
A piezo-metastructure with bistable circuit shunts for adaptive nonreciprocal wave transmission
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DOI：
10.1088/1361-665x/ab083c
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发表时间：
2019-04-01
影响因子：
4.1
通讯作者：
Wang, K. W.
中科院分区：
文献类型：
--
作者：
Zheng, Yisheng;Wu, Zhen;Wang, K. W.
本文提出了一种压电超结构，通过并联压电电路实现自适应非互易弹性波传输。首先研究了该电路的静态特性，然后对非线性压电元结构的波传输特性进行了数值研究。本地谐振带隙和带隙传输现象，也被称为超传输，进行了探索和研究。通过引入电路的不对称性，超传输阈值，临界激励振幅，使带隙传输，发现在不同的水平为不同的波传输方向，从而创建一个激励振幅范围内，非互易波传输可以促进。随后分析了不对称因子对非互易特性的影响，并确定了前向传输幅度与非互易激励范围之间的权衡。此外，它表明，所提出的非线性压电元结构的波传输特性可以自适应调整，方便地调整稳定平衡的MEMS电路。最后，所观察到的波的传输特性进一步证实了实验研究。总体而言，结果说明了一种新的手段来操纵单向弹性波传输使用非线性压电元结构。
In this paper, we present a piezo-metastructure shunted with bistable circuits to achieve adaptive nonreciprocal elastic wave transmission. Static properties of the bistable circuit are first investigated, followed by numerical investigation of wave transmission characteristics on the nonlinear piezo-metastructure. Both the local-resonance bandgap and the bandgap transmission phenomenon, also known as supratransmission, are explored and investigated. By introducing circuit asymmetry, the supratransmission thresholds, critical excitation amplitudes to enable bandgap transmission, are found at different levels for the different wave transmission directions and hence creating an excitation amplitude range within which nonreciprocal wave transmission can be facilitated. Effect of the asymmetry factor on nonreciprocity properties is subsequently analyzed and the trade-offs between the forward transmission amplitude and the range of excitation with nonreciprocity are identified. Additionally, it is demonstrated that wave transmission characteristics of the proposed nonlinear piezo-metastructure can be adaptively tuned by conveniently adjusting stable equilibria of the bistable circuit. Lastly, the observed wave transmission properties are further corroborated by experimental investigations. Overall, the results illustrate a novel means to manipulate unidirectional elastic wave transmission using a nonlinear piezo-metastructure.