低温液位传感器校准装置几何误差辨识方法的研究

针对低温液位传感器校准装置的夹具端空间姿态问题,提出了一种基于多边法原理的误差辨识方法。利用激光跟踪仪测距精度高的特点,采用多边法原理对校准装置夹具端的运动轨迹进行标定,以重力加速度方向为Z轴反方向建立虚拟坐标系,利用刚体中两点位置始终不变的特性,获得被测点6项误差的冗余数据,实现校准装置几何误差的辨识。仿真结果表明,所提出的方法具有一定的可行性,采用遗传算法与信赖域法、Guass-Ne叭加法相结合的方法,在一定程度上避免因初值难以确定造成的数据不收敛问题。

Geometry Error ldentifiCation on Calibration DeviCe of CryogeniC Liquid Level Sensor

In order to solve the problems of fixture spatial attitude on calibration device of cryogenic liquid level sensor,an error identification based on the principle of multilateral method is proposed. Based on the high-precision distance measurement of laser tracker,using the principle of multilateral method to calibrate the track of the calibration device,a virtual coordinate system is created which uses the gravity opposite direction as Z-axis direction,and because two positions always being the same in rigid body,the redundant data of six errors are obtained,so the error identification of calibration device is finished. Simulation results show that the method is feasibility,combinating genetic algorithm and trust region method with Guass-Newton can effectively avoid non-convergence problem which were caused by unknown initial data.