航空发动机叶片高精度自动测量系统

High precision automatic measurement system for aero engine blade

为了解决叶片完整型面自动测量存在的问题,提出了一种叶片高精度自动测量融合系统.系统结合双目三维扫描装置和电控转台,利用高精度校准平面旋转,通过平面拟合、虚拟转轴及角度计算,获取高精度四元数及中心位置坐标后完成自身定位.多次测量数据以中心坐标为中心,进行四元数运算,即可实现叶片实时测量融合.对融合后数据采用阈值迭代就近点(ICP)算法收敛处理消除机械转动误差.结果表明:系统装置综合精度为0.03~0.04mm,可自动、高效、稳定地实现发动机叶片的高精度测量.

In order to solve the current problems of the blade surface automatic measurement, a high precision automatic measurement fusion system was put forward. The self-developed measuring equipment and the electronic controlled turntable were combined into one complete measurement system. Using high precision calibration plane rotation, the high precision quaternion and the center position coordinates could be obtained for the system location through the plane fitting, virtual axis and angle calculation. The real time measurement and fusion of the blade could be realized by using the center coordinate and the four element number operation. The convergence of the threshold iterative closest point （ICP） to the fusion data was used to eliminate the error of mechanical rotation. Results show that the integrated precision of the system is 0. 03-0. 04mm, which can realize the high precision measurement of the engine blade automatically, efficiently and stably.