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캐드 기반 범용 최적설계 시스템 개발 및 피로수명을 위한 구조형상최적설계에의 응용
유용균(Yonggyun Yu),곽병만(Byung Man Kwak) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
In this paper, an integrated optimal design software system for structural components has been developed<br/> which interfaces existing commercial codes for CAD, CAE and Optimization. They include specialized<br/> optimal design software codes such as iSIGHT and VisualDOC, optimization module imbedded in CAD<br/> software developed by CAD developers, and optimal design software systems based on API of commercial<br/> CAD software. The advantages of the CAD imbedded optimal design approach and those of specialized<br/> optimal design software are taken to develop the system. The user defines optimal design formulation in the<br/> user interface for problem definition in the CAD control stage, where design variables are directly selectable<br/> from the CAD model and various properties and performance functions defined. The commercial CAD codes,<br/> Open I-DEAS are used for the development. The resulting software is minimally connected to CAD and CAE<br/> systems while keeping maximum independence from each other. This assures flexibility and freedom for<br/> problem definition. Fatigue life optimization is taken as a nontrivial application area. As a specific example,<br/> the shape design of a knuckle part of an automobile is performed, where the minimum fatigue life over the<br/> material domain in terms of the number of cycles of a curb strike are maximized under the constraint of not<br/> exceeding the current mass. The fatigue life has been improved by four times of the initial life. The developed<br/> software is illustrated to maintain the advantages of existing optimal design software systems while improving<br/> independency and flexibility.