摘要：When estimating the construction cost of ship structure in early design stag e, it is important to decide roughly the arrangement and scantling of structural member of mid ship section in a short examination time. The technique for determining the optimal structure of midship section using a genetic algorithm etc. has begun to be a pplied in actual design. However, these optimization techniques seem not to be able to obtain the optimal structure within practical computation time.Moreover, CSR (Common Structural Rule), which is published in April 2006 by IACS, requires FEM calculation for estimating the stress of double bottom member, such as bottom plate, inner bottom plate, transverse webs, and girders . If including FEM analysis directly in an optimal structural calculating program, it will require great computation time. In this research, FEM calculations for typical scantling of above members were performed and the response surface for estimating the stress of above members is produced. By including this response surface in the optimal design calculation using a genetic algorithm, the optimal structural calculation for the midship section was realized within a practical computation time. The availability of optimal calculation for structural members in mid ship section is presented by showing calculation results for Handy max bulk carrier.
