降伏及び座屈応力を考慮した船体二重底部構造最適化に関する研究 : 船体二重底形状と板厚を設計変数とした構造最適化における構造的考察 A Study on the Structural Optimization of Double Bottom Part of Ship Structure under Considering Stress and Buckling Constraints : Structural Considerations of Shape and Thickness Optimization of Double Bottom Part of Ship Structure
A structure optimization for the initial design stage using FEM of ship is under consideration in this paper. General bulk carrier is selected as the object of the optimization. Both the size and the plate thickness of the bottom structure of the ship are taken as design variable simultaneously for the weight minimum optimization problem. The individual mesh-subdivision technique and the multi-point constraint method are used for change the bottom shape in this paper. Five design variables for the shape and thirty-one design variables for the plate thickness are considered for the optimization of ship structure. The yield stress constraint conditions for each element and buckling stress constraint conditions for each buckling plate on the bottom plate, the inner bottom plate, the girder plate, the floor plate, and the bilge hopper plate are considered. The optimal calculations are performed with several conditions of the types of design variable and constraint condition, and the designs obtained in the calculations are coMPared. It is shown that the Structural optimization with shape and plate thickness design variables can reduce the weight of ship structure effectively. Genetic algorithm is used for the optimal calculation since the design variables are discrete resulting in a combination optimization problem.
- 日本船舶海洋工学会論文集 = Journal of the Japan Society of Naval Architects and Ocean Engineers
日本船舶海洋工学会論文集 = Journal of the Japan Society of Naval Architects and Ocean Engineers (14), 1-8, 2011-12-01