一种双局域共振型压电声子晶体梁的带隙与振动衰减特性

通过在环氧树脂梁上周期性黏贴压电层,并连接含有两个分支的谐振分流电路,构建了含压电分流电路的声子晶体梁结构。使用传递矩阵法(TM)计算压电声子晶体梁的带隙特性,发现这种压电声子晶体梁结构可产生两个局域共振带隙,并且这两个局域共振带隙都可以通过改变电路参数来调节位置和带宽等,这就可以很方便的对两个频段的弹性波的传播进行控制。采用有限元仿真分析计算压电声子晶体梁的振动传输特性,仿真结果验证了理论分析的正确性。研究结果为压电智能型声子晶体的波传播控制提供了一种新的手段。

Study on band gaps in piezoelectric phononic crystals beam with double local resonant

Periodic arrays of piezoelectric patches connected with two-branch resonant shunting circuits are attached to an epoxy beam so as to construct a piezoelectric phononic crystal beam structure. The band-gap structure of the piezoelectric phononic crystal beam is calculated with the transfer matrix approach. It is found that this kind of piezoelectric phononic crystal beam can lead to two local resonance band gaps, and the two local resonant band gaps position and frequency bandwidth can be tunable by circuit parameters. So it can be very convenient to control the propagation of elastic waves in two frequency bands. The vibration transmission property of piezoelectric phononic crystal beam is calculated with the finite element analysis, and the results validate the theoretical predictions pricious. This work provides a new way in the design of phononic crystals with tunable band gaps.