An Accurate Point Set Matching Method for Hull Blocks With Engineering Constraints

Abstract To effectively improve the precision matching technique of measurement point set and design point set for hull blocks, an accurate point set matching method for hull blocks with engineering constraints (verticality, levelness, symmetry, flatness, etc.) and elimination error points is presented. It is divided into initial matching and refine matching. In initial matching, the improved Random Sample Consensus algorithm is proposed to eliminate error points rapidly and accurately; the improved Coherent Point Drift algorithm is proposed to obtain more accurate initial matching. In refine matching, the Analytic Hierarchy Process is used to obtain each weight of engineering constraints automatically, and the weight vector is introduced into the multi-optimization objective function to achieve the more reasonable matching results. The results proved that this method can rapidly and automatically eliminate error points, and get more accurate and reasonable results meeting engineering constraints. It can provide the basis for the subsequent assembly of hull blocks.