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A Practical Method For Ship Structural Optimization

A new ship structural optimization method is proposed in this paper. The objective of this method is to reduce both material costs and labor costs of the ship under the condition that the structure strength meets the security requirements. The optimization process has two stages, material costs optimization and labor cost optimization. In the first stage, yield strength by Finite Element Method (FEM), buckling strength, and rule scantling requirements are taken into account simultaneously, and all the dangerous loads and loading conditions in the whole operating cycle are properly considered, which makes this method more accurate than the others. The minimum structural weight is made the optimization objective, and the yield strength requirements, buckling strength requirements and rule requirements are taken as constraints. An effective optimization strategy is presented, and proved to be highly efficient for the above optimization problem. After optimization solution, the optimal thickness of the panels that satisfies all the strength requirements is obtained. As there may be thousands of panels in the structure after optimization, and the thickness of the panels may be different from each other, the optimized structure could not be used in engineering practice directly. So in the second stage, an optimization algorithm of plate seam layout according to the structure optimization result is developed. This algorithm makes the structure a little heavier; however, the modified structure meets the requirements of the shipbuilding technology. As a result, this optimization method could improve the structural strength and reduce the material costs as well as labor costs significantly.