In this work, we experimentally achieve 1-kHz-wide directional band gaps for elastic waves spanning a frequency range from approximately 8 to 11 kHz. One-way propagation is induced by way of a periodic waveguide consisting of an aluminum beam partially covered by a tightly packed array of piezoelectric patches. The patches are connected to shunt circuits, where switches allow a periodic modulation in time of the beam properties. A traveling stiffness profile is imposed by phasing the modulation of each active element, inducing the propagation of a plane wave along the material and establishing unidirectional wave propagation at band-gap frequencies.

中文翻译：

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使用分流压电阵列的时空调制光束中不可逆带隙的实验观察

在这项工作中，我们通过实验实现了针对弹性波的1 kHz宽的定向带隙，该弹性波的频率范围约为8至11 kHz。单向传播是通过一个周期性的波导引起的，该周期的波导由一个铝束组成，铝束的一部分被紧密堆积的压电片阵列覆盖。贴片连接到分流电路，在分流电路中，开关允许对光束特性进行时间的周期性调制。通过定相每个有源元件的调制，引起平面波沿材料的传播并在带隙频率处建立单向波传播来施加行进刚度分布。