无线卡环式扭矩传感器及测试系统关键技术研究

Research on key technologies of wireless clamp-on torque sensor and measurement system

研究了无线卡环式扭矩传感器及测试系统中的关键技术,建立了卡环式机械结构的力学模型,通过有限元仿真验证了该理论模型的正确性并对结构进行优化;设计并完成了相应的无线扭矩测试系统,提出了一种新型电桥调平方法。实验结果表明,应变传感器自身误差为±2Ω时,新型电桥调平方法的调节精度比不调节时提高了70倍;在±100N·m偏载下,系统的灵敏度为12.5mV/N·m,精度在8‰之内,且重复性和一致性较好。因此,所设计的扭矩测试系统是可行的,为扭矩的非接触测量和工程应用提供了一定的参考意义。

This paper presents the key technologies of the wireless clamp-on torque sensor and measurement system.The theoretical mechanical model of clamp-on structure is established,its correctness is verified and optimized by the finite elementsimulation.The corresponding wireless torque measurement system is designed and completed,and a novel bridge balance control method is proposed.The experimental results show that:When the strain sensor error is±2Ω,the adjusting precision of the novel control method is 70 times higher than that of the non-adjusting.Under±100 N·m torque load,the sensitivity and the accuracy are 12.5 mV/N·m and 8‰respectively,the repeatability and the consistency of the system are good.So the torque measurement system designed in this paper is feasible.That provide some reference for the non-contact torque measurement and the engineering application.