15. An Object Oriented Tool for the Preliminary Design of Ships

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To build a computer aided design system, it is necessary to develop a suitable model for representing design objects like a ship and design processes that determines the mechanism of redesigning strategy. In this research, design object is described as a combination of a date structure and a set of constraints which restricts the behavior of some related design parameters. And design process is represented as if -then rules which are expression of a skillful engineer's know-how of design. The object-oriented representation form is employed to develop a computer aided ship basic designing system. In this system, design object, design parameter, constraint and designer are represented as "object". An object is a date structure with algorithms called method describing its own behavior or characteristic. Object-oriented representation is suitable for constructing design systems because: (1) Complicated date structures and their behavior can be easily represented, (2) Using the function of inheritance one can put many similar objects in order efficiently, (3) Message passing paradigm makes it easy to organize the whole system, (4) An object is independent and self-supporting so the system operating on the object-oriented environment has excellence in maintenance. We implemented constraint-riented system by defining constraints as objects. In using this system, we can easily add or delete design parameters, constraints and if-then rules, so we are able to build or modify the model structure and knowledge-base flexibly. Finally, some application results of basic design of ships are presented to show the effectiveness of the system.
社団法人日本船舶海洋工学会の論文

15. An Object Oriented Tool for the Preliminary Design of Ships

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