Experimental realization of an active non-reciprocal metamaterial using an eigen-structure assignment control strategy.
Experimental realization of an active non-reciprocal metamaterial using an eigen-structure assignment control strategy.
复制标题
使用本征结构分配控制策略实验实现主动非互易超材料。
DOI：
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发表时间：
2021
影响因子：
2.4
通讯作者：
A. Baz
中科院分区：
文献类型：
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作者：
H. Zhou;A. Baz
本文提出了一类有源非互易超材料（ANMM），试图控制声波沿一维声导管的流动。所提出的方法与现有方法不同，在现有方法中，非互易性是由各种非线性源、循环器和陀螺仪/回转器组件和/或时空调制主动或被动生成的。所提出的方法依赖于控制器的操作，该控制器是通过同时分配特征值和特征向量而设计的。换句话说，闭环系统的整个特征结构根据需要进行分配。传统上，特征值的放置被用来增强系统的阻尼和响应。然而，在这项研究中，重点放在调整特征向量上，以实现波沿声导管传播的空间控制和重新分布，以产生任何所需的非互易行为。在整个过程中，系统继续以线性方式运行。介绍了控制该方法操作的理论，并进行了全面的实验验证，以证明其基本特征、非互易行为和控制特性。将所提出的策略推广到二维声学系统是当前工作的自然延伸。
This paper presents a class of active non-reciprocal metamaterials (ANMMs) in an attempt to control the flow of acoustic waves along a one-dimensional acoustic duct. The proposed method distinguishes itself from the available approaches where the non-reciprocities are generated either actively or passively by various sources of nonlinearities, circulators and gyroscopic/gyrator components, and/or spatiotemporal modulation. The proposed method relies in its operation on a controller that is designed by simultaneous allocation of both the eigenvalues and eigenvectors. In other words, the entire eigen-structure of the closed-loop system is assigned as deemed necessary. Conventionally, the placement of the eigenvalues has been employed to enhance both the damping and response of the system. However, in this study, the focus is placed on adjusting the eigenvectors in a way that enables the spatial control and redistribution of the wave propagation along the acoustic duct in order to produce any desirable non-reciprocal behavior. During this entire process, the system continues to behave in a linear fashion. The theory governing the operation of this proposed approach is introduced, and a comprehensive experimental validation effort is presented to demonstrate the basic features, non-reciprocal behavior, and control characteristics. Generalization of the presented strategies to two-dimensional acoustic systems is a natural extension of the present work.