SAW动态转矩传感器理论计算与推导

Theoretical Calculation and Deduction of SAW Based Dynamic Torque Sensor

动态转矩的测量对于机械传动过程的监测和控制具有重要意义,现有的测量方式大都是有源接触式的测量,多具有接触滑片磨损和测量精度下降等问题。本实验采用声表面波(SAW)技术的动态转矩测量方法。通过分析其工作原理,以典型ST切片石英基体材料为例,推导SAW器件谐振频率与转矩的关系表达式,提出采用差分连接方式来消除温度对于测量结果的影响,并简要分析测量系统的构成与工作原理。

It is of great significance to measure the dynamic torque for monitoring the mechanical transmission process. However, the existing methods are mostly active contact measurements, and have such problems as contact wear and precision decreasing. In this paper, a method of dynamic torque measurement based on SAW technology was proposed. The working principle was analyzed, and as an example, the mathematical expression between the resonant frequency and the dynamic torque was deduced with the typical ST section of quartz as basis material. A method that eliminates the influence of temperature on measuring result by using differential connection was presented. The structure and procedure of the measurement system was also analyzed briefly.