考虑半径补偿的三坐标测量数据精确配准方法

叶片模型的配准定位是叶片形状检测分析的一个核心环节,针对涡轮叶片的三坐标测量数据在基于迭代最近点的配准定位中与CAD模型表面点的配准关系不对应的问题,提出一种考虑半径补偿的精确配准方法。在求取配准点集的过程当中考虑到半径补偿,使得测量点集与待配准点集之间的关系相对应,进而获取更高的配准精度。进行基于仿真数据的配准试验及对比,给出了基于实测数据的应用与分析,验证了该方法的精确性与实用性。结果表明,考虑半径补偿的三坐标测量数据精确配准方法是可行的。

Accurate Registration Method Considering Radius Compensation for CMM Data

Model registration is a key technique for turbine blade shape inspection. In order to solve the problem that registration relation based on the iterative closest point method between CMM data of turbine blade and points on the CAD model surface doesn’t correspond, one kind of model accurate registration method considering radius compensation is brought forward. It makes measured points and point set prepared to align correspond to each other by taking radius compensation into account when calculating the alignment point set, so as to obtain higher accuracy during the registration. Experiments based on simulation data are performed and application example is shown to verify the precision and practicability of this method. The feasibility of the discussed method is verified by the experimental results.