单向输电线并联线性压电元结构中的自适应非互易波衰减
Adaptive nonreciprocal wave attenuation in linear piezoelectric metastructures shunted with one-way electrical transmission lines
摘要：
与弹性介质相反，它很容易实现电气元件之间的单向耦合特性，这使得电波能够单向传输。在本文中，我们探索和利用的相互作用的压电梁的单向电力传输线，以促进非互易传输的弹性波的线性方式。通过理论频散分析和数值模拟，揭示了弹性波在该压电超结构中的传播特性。结果表明，当引入单向电耦合特征时，局部谐振带隙保持在压电元结构的相反方向上。然而，在一个方向上的带隙衰减能力增加相比，传统的局部谐振元结构，其中没有电耦合之间存在的细胞，而在另一个方向上的减少。因此，在这种系统中，由于明显的带隙衰减能力，弹性波的非互易传输出现。这种非互易性的消波能力与单向电耦合系数和电池电阻大小相适应。建立了压电元结构的实验装置，实验结果验证了非互易性和自适应性。总体而言，所提出的压电元结构提供了一个线性和简洁的方法来实现自适应非互易传输的弹性波。
英文摘要：
In contrary to elastic media, it is easy to attain one-way coupling feature among electrical elements, which enables unidirectional transmission of electrical wave. In this paper, we explore and exploit the interaction of a piezoelectric beam with a one-way electrical transmission line to facilitate nonreciprocal transmission of elastic wave in the linear fashion. Theoretical dispersion analysis and numerical simulations are performed to reveal transmission behaviors of elastic wave in the presented piezoelectric metastructure. It is uncovered that, when the one-way electrical coupling feature is introduced, local-resonance bandgaps are maintained in opposite directions of the piezoelectric metastructure. However, the bandgap attenuation capability in one direction is increased compared to conventional local-resonance metastructures, in which no electrical coupling exists between cells, while that in the other direction is decreased. Therefore, nonreciprocal transmission of elastic wave emerges in this system due to the distinct bandgap attenuation capability. It is also revealed that this sort of nonreciprocal wave attenuation capability is adaptive with the one-way electrical coupling coefficient and the resistance of electrical cells. An experimental set-up of the piezoelectric metastructure is built and experimental results verify the nonreciprocity property and its adaptiveness. Overall, the presented piezoelectric metastructure provides a linear and concise approach to realize adaptive nonreciprocal transmission of elastic wave.
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