Fig. 1. Reconstructed three-dimensional model of locomotive surface

Fig. 2. Two-dimensional Voronoi diagram and Delaunary triangle

Fig. 3. One block and 26 adjacent grids

Fig. 4. RBNN diagram

Fig. 5. Normal distribution of the locomotive surface

Fig. 6. Relationship between the four coordinate systems

Fig. 7. Polishing system model based on ellipsoid

Fig. 8. Sectional view of ellipsoid

Fig. 9. Robot polishing system designed through experiment

Fig. 10. Experimental results of different curvature regions. (a) Flat area; (b) small curvature surface area; (c) complex curvature surface area

Fig. 11. Result of secondary polishing of complex curvature surface area