基于FPGA的光纤式旋转扭矩测量系统设计  

Design of Optical Fiber Rotary Torque Measurement System Based on FPGA

作　　者：何翰林 林杰俊 胡佳成[1] 陈爱军[1] HE Hanlin;LIN Jiejun;HU Jiacheng;CHEN Aijun(China Jiliang University;Shanghai Marine Equipment Research Institute)

机构地区：[1]中国计量大学 [2]上海船舶设备研究所

出　　处：《仪表技术与传感器》2024年第11期121-126,共6页Instrument Technique and Sensor

基　　金：国家科工局技术基础科研项目(JSZL2019207B011)。

摘　　要：针对在挠性连接的大型传动设备的运行状态健康监测中有效提高旋转状态下中高扭矩测量准确性的问题,设计了一套可用于挠性连接的基于FPGA的光纤式旋转扭矩测量系统。采用带有30组明暗相间膜片的转盘,利用光纤传感器将轴的扭转信号转换为光电信号输出,采用施密特整形电路将传感器输出的模拟信号转换为数字信号连入FPGA中。通过FPGA内部的可编程逻辑单元与高频计数器,将数字信号转换为计数值的形式,并发送至上位机。通过LabVIEW编写上位机软件,实现数据整周期处理的功能,并将结果显示出来。在刚性连接的实验中,系统对旋转稳态扭矩测量的相对误差均优于2.0%;在挠性连接的实验中,系统对旋转稳态扭矩测量的相对误差均优于3.0%。证明该系统在500~2 000 N·m范围的不同连接方式下,对旋转稳态下扭矩的测量都具有较好的准确性。Aiming at the problem of improving the measurement accuracy of medium and high torque effectively in the running state health monitoring of large transmission equipment with flexible connection,an FPGA-based optical fiber rotary torque measurement system was designed for flexible connection.A turntable with 30 sets of light-dark diaphragm was used to convert the shaft torsion signal into photoelectric signal output by optical fiber sensor.The analog signal output by sensor was converted into digital signal by Schmidt shaping circuit and connected to FPGA.Through the programmable logic unit inside the FPGA and the high frequency counter,the digital signal was converted into the form of counting value and sent to the upper computer.The upper computer software was programmed by LabVIEW to realize the function of data cycle processing,and the results were displayed.In the experiment of rigid connection,the relative error of the system is better than 2.0%.In the experiment of flexible connection,the relative errors of steady-state torque measurement of the system are better than 3.0%.It is proved that the system has good accuracy in the measurement of rotational torque under different connection modes in the range of 500~2000 N·m.

关 键 词：扭矩测量 光纤传感器 FPGA 挠性连接 旋转稳态 

分 类 号：TH823[机械工程—仪器科学与技术]