基于光纤光栅的螺纹管压弯扭测量技术

Measurement Technique of Pressure,Bending Moment and Torque for Threaded Pipe Based on Fiber Bragg Grating

引入光纤光栅传感器,并结合螺纹管压弯扭分离测量理论,实现对螺纹管所受压力、弯矩和扭矩的测量.由测量结果可知,光纤光栅传感器测得压力与驱动电机上压力传感器测得压力基本相符,两者测得压力的差值为-11.4~15.5N;光纤光栅传感器测得弯矩与理论值基本一致,两者之间的差值为-0.54~0.46N·m;光纤光栅传感器测得扭矩与驱动电机上扭矩传感器测得扭矩基本相符,两者测得扭矩的差值为-0.54~0.87N·m.测量结果验证了光纤光栅传感器对螺纹管力学参数测量的可行性,为螺纹管的力学参数测量提供了一种新方法.

Based on the separation measurement theory of axial force,bending moment and torque in threaded pipe,the axial force,bending moment and torque of threaded pipe were measured by using Fiber Bragg Grating sensors.From the measured results,the axial force measured by fiber Bragg grating sensors is agreement with that by pressure sensor from driving motor,the error value is between-11.4 N and 15.5 N;the bending moment measured by Fiber Bragg Grating sensor is agreement with the theoretical value,the error value is between-0.54 N · m and 0.46 N· m;the torque measured by Fiber Bragg Grating sensor is agreement with that by torque sensor from driving motor,the error value is between -0.54 N · m and 0.87 N· m.The measured results verify the validity of measuring mechanical parameters for threaded pipe by Fiber Bragg Grating sensor.This technology provides a new method of mechanical parameters measurement for threaded pipe.