Optimization Research of Pipelines Collaborative Layout of Ship Based on EPA-star Algorithm

Objectives Aiming to overcome the efficiency and engineering practicality issues of existing pipeline layout design methods, this study explores a high-efficiency EPA-star (Escape Pruning A-star algorithm) for pipeline layout optimization. Methods The layout space is discretized based on the escape graph method, the resulting connection points are stored as the adjacency table, the estimated traversal cost and penalty function are introduced to reduce the bending and folding phenomenon in the path, and the path is pruned to improve the quality of paths in the case of large spans; a method of branching point selection for branch pipelines considering the forbidden region is proposed, which improves the quality and efficiency of the path design; By improving the layout efficiency at the pipeline level within the collaborative strategy, a more effective collaborative layout algorithm can be achieved. Results The feasibility and effectiveness of the EPA-star algorithm in the piping layout of conventional ships and its practicality in the complex layout of special ships are verified through the simulation examples of the nacelle fuel piping of real ships and the nacelle piping of nuclear-powered ships, respectively, and the length of the piping is shortened by 0.52% and 35.41%, and the number of elbows is reduced by 32.3% and 6.5%, leaving more space for maintenance, and the effect of the collaborative piping is more compact than that of the original engineering case. The effect is more compact than the original project case, and the quality of piping is significantly improved. Conclusions The research results can provide useful guidance for the design of piping layout scheme for common ships and special ships.