水平剪切声板波的激发机理及其特性研究

Study on Excitation Mechanism and Characteristics of Shear-Horizontal Acoustic Plate Mode Wave

水平剪切声板波(SH-APM)是在板状固体结构中传播的一种声波,其质点振动垂直于传播方向和界面法线。针对SH-APM的激发机理和激发特性两个方面展开研究。首先通过分析压电介质的Christoffel方程组解耦情况来研究SH-APM的激发机理,推导出为了在压电板上激发出SH-APM,压电基片的材料常数所必须满足的条件;然后在此基础上,建立了SH-APM器件的理论分析模型,并以PZT-5H压电陶瓷为例,研究了SH-APM的激发特性,包括激发模态、传播速度、激发效率、振动位移等;最后,通过实验以及理论计算与相关文献对比,证明了理论模型的正确性及研究结果的有效性。

Shear-horizontal acoustic plate mode wave （SH-APM） propagates in the plate, which has particle displacement normal to the propagation direction and parallel to the plate surface. This paper focuses on the excitation mechanism and characteristics of SH-APM. Firstly, the decoupling status of Christoffel equations of piezoelectric medium is analyzed for the purpose of studying the excitation mechanism of SH- APM. In order to excite SH-APM in the piezoelectric plate, some conditions concerning the material constants of the piezoelectric substrate are derived. Next, the theoretical analysis model of SH-APM device is established, accordingly. Using PZT-5H piezoelectric ceramic as an example, the excitation characteristics of SH-APM are investigated, including excitation modes, propagation velocity, excitation efficiency, and vibration displacement, etc; Lastly, by experiment and comparison between theoretical calculation and corresponding reference, the validity of the theoretical models and the practicability of the research results are verified.