Spherical-Cymbal换能器位移特性有限元分析

Finite Element Analysis on Displacement Performance of Spherical-Cymbal Transducers

提出了一种新型的Spherical-Cymbal压电复合换能器,Spherical-Cymbal换能器由厚度方向极化的压电陶瓷薄圆片夹持在两个球形金属端帽之间制成,每个金属端帽内表面均有一个浅球冠形空腔,球形金属端帽起机械放大作用,它将压电陶瓷薄圆片的微小径向位移转换并放大为垂直其表面的较大的轴向位移。分析了影响Spherical-Cymbal换能器轴向位移性能的几何因素及物理因素,采用ANSYS软件对Spherical-Cymbal换能器位移特性进行了仿真。

A new-type design, Spherical-Cymbal transducer, is presented. Spherical-Cymbal transducer consists of a piezoelectric ceramic disk （poled in the thickness direction） sandwiched between two spherical metal end-caps, each containing a shallow spherical inner cavity. The spherical end-caps serve as mechanical transformers for converting and amplifying the small radial displacement of the ceramic disk into a much larger axial displacement normal to the surfaces of the end-caps. Those geometrical and physical factors that affect the axial displacement performance of Spherical-Cymbal transducers are analyzed and the displacement performance of Spherical-Cymbal transducers are simulated with finite element method and ANSYS software.