Model registration control point set selection for turbine blade shape inspection

Model registration is a key technique for turbine blade shape inspection. In order to solve the problem of reliable registration based on the iterative closest point method for the density measurement data of the turbine blade and its CAD model, one kind of model registration control point set selection method based on the CAD model is brought forward. For certain blade, the model registration base points are firstly pre-planned according to its CAD model and the model registration reliability index; then, align the measurement data with the base point set, find out the measurement points relating to the base points as the alignment control points and filtering the bad points. Experiments based on both simulation data and real measurement data are performed and several guidelines for blade registration control point set selection are summarized. The feasibility of the discussed method for turbine blade shape inspection is verified by the experimental results.