非接触式转轴扭矩测量系统偏心误差的修正研究

轴系运转状态在线监测的主要内容为转轴扭矩的测量。对于基于非接触式转轴扭矩的测量方法，能否精确地测量轴系扭转角度将决定扭矩和功率测量结果的准确性。分析了原系统的偏心误差，以及码盘安装偏心对光电检测器扫过码盘扇形通光孔的时间的影响，并通过几何分析以及运动分解给出了码盘扇形通光孔的通光时间的偏移的具体数学表达式，以此消除测量系统的偏心误差。研究结果对转轴扭矩测量仪的设计提供了理论指导，有利于提高此类设备的测量精度。

Research on the correction of eccentric error based on non-contact shaft torque measurement system

The main content of the online monitoring of operation statues of shaft is the measurement of shaft torque. For the method that the shaft torque is gotten by the non-contact measurement, the accuracy for measurement of torsional angle determines the correction of measurement result for shaft torque. In this paper, the eccentric error of original system is analyzed, and the effect of eccentric installment of the encoder on the time that the photo-electric sweeps sectorial photoelectric light pass hole is also analyzed. Then the specific mathematical expression of the time offset that the light pass the optical aperture is given by geometric analysis and motion decomposition. And the eccentric error of the measurement system is eliminated according to the analysis. The research of this paper will provide theoretical guidance for the design of torque measuring instrument, and it is helpful to improve measurement accuracy of this kind of devices.