基于COMSOL声表面波扭矩传感器的有限元分析

Finite Element Analysis of Torque Sensor Based on COSMOL Surface Acoustic Wave

基于对汽车转向扭矩测量方法的研究,重点分析了SAW扭矩传感器的工作机理以及优势,并建立其力学和数学模型。分析了作为转向扭矩传感器的核心元件弹性轴以及压电膜片的选择要素,并基于COMSOL的大型仿真功能对弹性轴和压电膜片进行有限元分析,模拟了声表面波扭矩传感器的力学特性,保证了敏感膜片以及弹性体在承受最大扭矩时不至于破坏,在承受最小扭矩时能够保证其灵敏度,为汽车转向SAW扭矩传感器的器件设计提供理论依据。

Based on the research of automotive steering torque measuring methods,we analyzed the work mechanism of SAW torque sensor and advantages,and established its mechanical and mathematical model. We analyzed selection elements of the elastic axis which is the core of steering torque sensor devices and piezoelectric diaphragm. Based on COMSOL＇s large simulation function of elastic axis and piezoelectric diaphragm finite element analysis,we simulated the mechanics characteristic of the surface acoustic wave torque sensor,and ensured that the sensitive diaphragm and elastic under the maximum torque and cannot be damaged under the maximum torque and ensured its sensitivity when taking the minimal torque,which provides theoretical basis for designing SAW torque sensor for vehicle steering devices.