船用超声液位传感器的压电陶瓷瞬态特性分析

为解决传统解析法难以求解压电陶瓷瞬态特性的问题,将有限元方法引入到压电陶瓷瞬态特性分析中去.介绍了压电陶瓷瞬态特性分析的有限元理论,提出了有限元计算过程中的5个关键问题的解决方法,并从给出压电陶瓷实例出发进行了仿真试验,比较了不受约束力和受环状压应力两种结构形式下压电陶瓷的发射和接收特性.研究结果证明,环状分布压应力有...

Analysis of transient characteristics for shipborne piezoelectric ceramic of ultrasonic liquid level transducer

It is difficult for the traditional analytical method to analyze the transient characteristics of piezoelectric ceramic. In order to solve the problem,the finite element method （FEM） was investigated. After introducing FEM theory,the solution to the key operation process were suggested, and the model of piezoelectric ceramic used for a certain type of marine ultrasonic liquid level transducer was built using the ANSYS software. On the condition of acoustic emission and the receiving,the effect on electro-mechanical transformation efficiency and the stress field profile of two forms of compressive stress was simulated separately. The results indicate that the electro- mechanical transformation efficiency can be raised by virtue of compressive stress of ring-shaped distribution, and the sensitivity of the transducer can be raised consequently. However, it causes the appearance of stress concentration and cycle.