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김지언(Ji-Eon Kim),기원용(Won-Yong Ki),김정호(Jung-Ho Kim),허승진(Seung-Jin Heo),임홍재(Hong-Jae Yim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This study was conducted to apply for integrated optimal design considered multi-disciplinary constrained conditions. Multi-disciplinary constrained conditions mean that lightweight design, structure stiffness and safety. Because such as these design parameters are conflictive relation, it is hard to design optimal model through conventional parameter study. Process was constructed with 4-phase. First phase is formatting the base model. In this study, base model was simplified for efficiency of analysis and also verified with test data simultaneously. In second phase, design variables that largely effecting on performance such as Roof crush and torsion/dynamic stiffness is selected. Form second phase, totally 18 design variables were selected finally, 8 variables are about thickness and 10 variables are about cross section shape. Third phase is formatting RBF type Meta-model established by using selected design variables and design of experiment (DOE). In the last phase, optimum result was calculated by using the EasyDesign program. Roof crush reaction force and torsion/dynamic stiffness were used for constrained conditions and mass minimization was object function for optimization.
지식기반 자체조인트 단면 평가 데이터를 이용한 차체 다분야 구속 최적설계 프로세스에 대한 연구
이동호(Dong-Ho Lee),기원용(Won-yong Ki),허승진(Seung-Jin Heo),김정호(Jung-Ho Kim),이경원(Kyungwon Lee) 한국자동차공학회 2015 한국자동차공학회 부문종합 학술대회 Vol.2015 No.5
To achieve effectiveness and optimized design for light weight vehicle body, many concept design methodologies have been studied. However, study using database would be not conducted yet. Therefore, In this study, it is a study on body structure multi-disciplinary optimum design process using knowledge-based body joint cross-section database. The database includes 42 competitive vehicles with 10 cross-sections. Using the database, cross section of body structure is selected for conceptual model construction. The target is reference model`s performance improvement. To select suitable cross section, what-if design method is applied. As a result, crashworthiness is about 15% and static/dynamic stiffness is 3.5% improved And also, body structure`s mass is 0.5% diminished. From this paper, it could be verified that cross-sectional performance affects body structure performance. Moreover, by evaluation of cross-section performance, fast variation of concept design would be capable.