Broadband Electromechanical Diode: Acoustic Non-Reciprocity in Weakly Nonlinear Metamaterials With Electromechanical Resonators
Broadband Electromechanical Diode: Acoustic Non-Reciprocity in Weakly Nonlinear Metamaterials With Electromechanical Resonators
复制标题
宽带机电二极管：具有机电谐振器的弱非线性超材料中的声学非互易性
DOI：
10.1115/1.4054962
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Barry, Oumar
中科院分区：
文献类型：
--
作者：
Bukhari, Mohammad;Barry, Oumar
近年来，具有非线性的超材料中的声学非互易性引起了人们的关注。然而，对非对称波传播的研究仅限于机械二极管。以前关于使用无源机制的机电整流器或二极管的工作在文献中很少。本文通过解析和数值研究非线性和线性超材料与机电谐振器的耦合来研究这一问题。系统的非线性在一种情况下源于链条，在另一种情况下源于机电谐振器。采用多尺度法得到了频散曲线的解析表达式。数值例子表明，机电二极管具有更宽的工作范围、可观的收获功率和显著的频移。观察到的频移通过频谱-空间分析得到证实，并被用来构造一个机电二极管来引导波只在一个方向上传播。这只允许对在一个方向上传播的波进行信号检测，而拒绝在任何其他方向上的信号。使用瞬时输入信号的传输比和非对称比来评估这种机电二极管的性能。提供了获得最佳机电二极管性能的设计指南。分析表明，对于非线性链的情况，在中波长限内，方向偏置波的传播具有很高的不对称率。事实上，目前的不对称和透射率比文献中报道的机械二极管要高。利用谐振器的非线性，还可以将工作频率展宽到长波长的极限频率。
Recent attention has been given to acoustic non-reciprocity in metamaterials with nonlinearity. However, the study of asymmetric wave propagation has been limited to mechanical diodes only. Prior works on electromechanical rectifiers or diodes using passive mechanisms are rare in the literature. This problem is investigated here by analytically and numerically studying a combination of nonlinear and linear metamaterials coupled with electromechanical resonators. The nonlinearity of the system stems from the chain in one case and from the electromechanical resonator in another. The method of multiple scales is used to obtain analytical expressions for the dispersion curves. Numerical examples show potential for wider operation range of electromechanical diode, considerable harvested power, and significant frequency shift. The observed frequency shift is demonstrated using spectro-spatial analyses and it is used to construct an electromechanical diode to guide the wave to propagate in one direction only. This only allows signal sensing for waves propagating in one direction and rejects signals in any other direction. The performance of this electromechanical diode is evaluated using the transmission ratio and the asymmetric ratio for a transient input signal. Design guidelines are provided to obtain the best electromechanical diode performance. The presented analyses show high asymmetry ratio for directional-biased wave propagation in the medium-wavelength limit for the case of nonlinear chain. Indeed, the present asymmetric and transmission ratios are higher than those reported in the literature for a mechanical diode. The operation frequencies can also be broadened to the long-wavelength limit frequencies using the resonator nonlinearity.