Seakeeping Design Optimization of KRISO Container Ship (KCS) Ship Form Considering Wave Action

Abstract

Abstract Combined with the optimization method, the seakeeping optimization design problem under regular waves is studied on the basis of potential flow theory. The Rankine source method and deep-water Stokes wave theory are used to design the energy-saving ship form in the actual navigation. Taking the bow and stern waterlines of the Korea Institute of Ships and Ocean Engineering container ship as the optimization design area, the free-form deformation method is used to realize the parametric modeling and geometric reconstruction of the hull. Taking the minimum wave added resistance and the minimum sum of heave and pitch amplitude as the objective function, the Sobol algorithm and improved non-dominated sorting genetic algorithm (NSGA-II) are used to optimize the hull design while ensuring the necessary displacement volume. This study confirmed that the seakeeping performance of the optimized ship is the best. The results show that the wave added resistance of the optimized ship is reduced by 6.344%, and the sum of heave and pitch amplitude is reduced by 3.475%. Therefore, the feasibility of the proposed optimization method can be verified.