船体中央断面最適設計の実用化と高速最適化システムの開発に関する研究

Abstract

A high-speed optimization system, which can be connected to user-friendly evaluating design candidates system, is developed here in order for handling a large number of de`sign variables with aim of supporting ship design. There are many design variables and complicated constraint conditions in ship structure design. Moreover, their relations are so complicated and some of them rely on the designer's tacit knowledge. In order to solve such problems, design process of ship structural design is analyzed by the use of DSM and PPM, and optimization system which can generate actual solutions of designer is developed. In the system, Microsoft Excel is used for handling complicated constraints. However, connecting an Excel file to an optimization engine as an external module makes computational time tremendously large in optimization process. In order to overcome this drawback, a program source file is created from an Excel file automatically and connected with a main part of optimization system. DLL file system, which makes dynamic linkage possible, resulting that any designer can solve optimization problems easily, is also used here. Mid-ship section is designed by not only the proposed optimization system but also a commercial optimization system. The proposed optimization system can give the same design with only 3% of computational time used for commercial optimization system.