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Experimental implementation of an active synthesis of a gyroscopic-nonreciprocal acoustic metamaterial

机译：陀螺仪 - 非探测声学超材料的活性合成的实验性

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摘要

Experimental realization of a new class of active Nonreciprocal Gyroscopic Meta-Material (NGMM) is presented. The proposed active NGMM system consists of a one-dimensional acoustic cavity provided with piezoelectric boundaries that act as sensors and actuators. These active boundaries are integrated with linear dynamic control capabilities that virtually synthesize a gyroscopic control action in order to generate desirable non-reciprocal characteristics of tunable magnitude and phase shift. The dynamics of a prototype of the NGMM cell are identified experimentally and the theoretical characteristics of the virtual gyroscopic controller are predicted for various control gains for both forward and backward propagations. The theoretical predictions are validated experimentally using a dummy NGMM cell to act as a physical dynamic controller. Such a preferred arrangement is coupled with analog controllers in order to enable fast execution of the controller and, in turn, enhance the bandwidth of its operating frequency. The time and frequency response characteristics of the NGMM cell are measured for different control gain and the behavior is evaluated for both forward and backward propagations. The obtained experimental results are found to be in close agreement with the theoretical predictions. The presented concept, controller design, and implementation of the NGMM can be extended to various critical structures to achieve realistic acoustic diode configurations in a simple and programmable manner.
机译：提出了一种新型活性非渗透陀螺仪荟萃材料（NGMM）的实验性实现。所提出的活性NGMM系统由一维声腔组成，其具有用作传感器和致动器的压电边界。这些活性边界与线性动态控制能力集成，实际上合成了陀螺控制动作，以便产生可调谐幅度和相移的所需的非互易特性。实验识别NGMM小区的原型的动态，并且预测虚拟陀螺控制器的理论特征，用于向前和向后传播的各种控制增益。使用虚拟NGMM单元进行实验验证理论预测，以充当物理动态控制器。这种优选的布置与模拟控制器耦合，以便能够快速执行控制器，并且又增强其工作频率的带宽。测量NGMM小区的时间和频率响应特性进行不同控制增益，并且对前向和后向传播进行评估行为。发现获得的实验结果与理论预测密切一致。呈现的概念，控制器设计和NGMM的实现可以扩展到各种关键结构，以实现简单且可编程的方式实现现实的声学二极管配置。

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  • 来源
    《Journal of Applied Physics》 |2021年第7期|074501.1-074501.13|共13页
  • 作者

    S. Raval; H. Zhou; A. Baz;

  • 作者单位

    Mechanical Engineering Department University of Maryland College Park Maryland 20742 USA;

    Mechanical Engineering Department University of Maryland College Park Maryland 20742 USA;

    Mechanical Engineering Department University of Maryland College Park Maryland 20742 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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