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航空叶片为薄壁复杂扭曲件,转轴标定是获得完整叶片型面数据的前提条件,标定精度直接决定着最终获得叶片数据的整体精度。针对锥光偏振全息干涉的非接触式测头未进行路径规划前只能测量部分球冠点云、球心拟合精度不稳定的问题,提出了一种带半径约束的最小二乘球心拟合方法,通过八个方位扫描数据拟合球心与法线方向,实现转轴的精密标定。实验结果表明,该方法减小多方位测量点云分层效果显著,精度完全满足航空叶片的测量需求。
Aeronautical blades are thin-walled, complex and distorted parts, and spindle calibration is a prerequisite for obtaining complete blade profile data. The calibration accuracy directly determines the overall accuracy of the final blade data. Aiming at the problem that the non-contact probe with conoscopic polarization holographic interference can only measure the point cloud of the partial sphere before the path planning and the accuracy of the fitting of the sphere center is not stable, a least square sphere with radius constraint Combined approach, through the eight azimuth scan data to fit the center of the ball and the normal direction to achieve precision shaft calibration. Experimental results show that this method can reduce the effect of multi-directional measurement point cloud delamination significantly and the accuracy meets the measurement requirements of aviation blades.