抄録
The purpose of this research is to reduce the volume of hatch cover consists of several kinds of plates by developing structural optimization method. The objective function is minimization of the volume. The design variables is a thickness of plate or sectional area. Constraint is 4 kinds of stress, Mises stress, bending stress, shearing stress, buckling stress. I used stress ratio to get optimal solution. The stress ratio is the solution that actual stress divided by allowable stress. Structural optimization of hatch cover consists of several kinds of plate is carried on by decreasing allowable stress of plates have high allowable stress in several kinds of plates is connected. This study succeeded in reducing volume by overcoming the problem of optimization observed when arranging several kinds of plates having in each division influences each other. Furthermore, this study succeeded in reducing volume by changing optimization technique of stiffeners by using stress ratio of plate.
