抄録
The optimization of the large structure with the layout of stiffener is considered by a new calculation method in this study. Many number of stiffener are attached to large structures. Optimization of the large structures with design variables of plate thickness and shape of stiffener is performed. However, in order to obtain a better optimal solution, the optimization of the structure with design variable of number of stiffener and allocation of stiffener is required. But, the optimization of structure with design variable of the number of stiffener and allocation of stiffener is not performed. There are two problems. The first problem is the FEM model. FEM models need some nodes at allocation of stiffener as a characteristic of FEM. When number of stiffener and allocation of stiffener are changed by the process of the optimization of the structure, number of nodes and allocation of nodes of FEM model is also changed. Therefore, in order to ensure consistency of mesh, it is necessary to remake FEM model. In order to optimize structural, it is necessary to examine many propositions for design. However it is difficult to create and analyze the proposition for design of many numbers in restricted time. The second problem is the optimization method. When the number and allocate of stiffeners are changed, the stricture is modified and the number of design variables is changed. The optimization problem with changed number of design variables cannot be optimized by standard optimization methods. The methods of solving these problems are examined.
