基于压电超材料的连续波束控制声棱镜
Acoustic Prism for Continuous Beam Steering Based on Piezoelectric Metamaterial
摘要：
本文研究了一种简单扫频连续声束控制的声棱镜。这种想法利用了超材料中局部共振附近的声波速度漂移。我们将这一概念应用到由主介质和压电LC分流器组成的压电超材料中。进行了理论建模和有限元模拟。结果表明，在局部共振附近，声波的相速度发生了剧烈的变化。声波的方向可以通过激励频率的简单扫描在2至16度之间连续调节。这种机电耦合系统具有在不改变系统的机械部分的情况下调节局部谐振的特征。
英文摘要：
This paper investigates an acoustic prism for continuous acoustic beam steering by a simple frequency sweep. This idea takes advantages of acoustic wave velocity shifting in metamaterials in the vicinity of local resonance. We apply this concept into the piezoelectric metamaterial consisting of host medium and piezoelectric LC shunt. Theoretical modeling and FEM simulations are carried out. It is shown that the phase velocity of acoustic wave changes dramatically in the vicinity of local resonance. The directions of acoustic wave can be adjusted continuously between 2 to 16 degrees by a simple sweep of the excitation frequency. Such an electro-mechanical coupling system has a feature of adjusting local resonance without altering the mechanical part of the system.
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