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비드 형상 최적화를 이용한 전방 측면 부재의 충돌 최적화 연구
이준영(Jun Young Lee),이정석(Jung Suk Lee),이용훈(Yong Hoon Lee),배복수(Bok Soo Bae),김규학(Kyu Hak Kim),임홍재(Hong Jae Yim) 대한기계학회 2012 大韓機械學會論文集A Vol.36 No.3
본 논문은 위상최적화 기법을 이용하여 전방측면 부재를 최적화 한다. 전방측면 부재에 최적화를 진행하기 전에 사각단면 부재에 최적화를 진행한다. 목적함수는 1 차 좌굴 계수가 길이방향으로 최소화 되도록 설정한다. 설계변수는 법선방향으로 질점의 이동이다. 사각단면부재의 반응표면법을 이용한 최적화 모델과 위상최적화 모델에 대해 충돌해석을 수행한다. 위상최적화 기법을 검증하기 위해 두 결과를 비교한다. 그 결과 위상최적화 기법을 충돌해석에 적용할 수 있다는 것을 확인하고 실제차량의 전방측면부재에 적용한다. 결과적으로 전방측면 부재는 최적화되고 내충격성이 향상한다. In this study, the front side member is optimized using a topography optimization technique. Optimization of a simple beam is conducted before optimization of the front side member. The objective function is set to minimize the first buckling factor in the longitudinal direction. The design variable corresponds to the perturbation of nodes normal to the shell’s mid-plane space. The crash analysis is conducted on a simple beam, which is optimized by Response Surface Method and the topography optimization technique. In order to verify the topography optimization technique, the results of the RSM and topography optimization model are compared. Consequently, we confirm the satisfactory performance of the topography optimization technique, and apply this topography optimization to the front side member. Thus, the front side member is optimized and its crashworthiness is increased.
불규칙 진동하중을 받는 쇽 타워의 피로수명을 고려한 점용접 위치 최적설계
이용훈(Lee, Yong-Hoon),이승윤(Lee, Seung-Yoon),배복수(Bae, Bok-Soo),이상범(Lee, Sang-Beom),임홍재(Yim, Hong-Jae) 한국소음진동공학회 2011 한국소음진동공학회 논문집 Vol.21 No.9
In this paper, optimal spot weld layout design for a shock tower structure is presented. This design increases the fatigue life of the spot-welds thereby increasing the fatigue life of the shock tower itself. In order to predict the fatigue life, a quasi-static analysis has been conducted then a fatigue analysis was performed through the application of random vibration loads. In order to optimize the spot weld layout, the design variables that have an effect on the spot weld fatigue life were determined. A spot weld fatigue analysis was then conducted based on the experiment design. Finally, a response surface model was made using the fatigue analysis results and an optimized spot weld layout model, one that increases the fatigue life of the spot welds and thereby the fatigue life of the shock tower, was developed.
불규칙 진동하중을 받는 쇽 타워의 피로수명을 고려한 점용접 위치 최적설계
이용훈(Yong Hoon Lee),이승윤(Seung Yoon Lee),배복수(Bok Soo Bae),임홍재(Hong Jae Yim) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
In this paper, optimal spot weld layout design of the shock tower structure is performed for increasing fatigue life of spot weld and fatigue life of shock tower simultaneously. To predict the fatigue life, linear static analysis is conducted then fatigue analysis is performed by applying random vibration load. To optimize the spot weld layout, design variables that have an effect on spot weld fatigue life are selected. Based on the DOE table, spot weld fatigue analysis is conducted. Finally, response surface model is made from fatigue analysis results and optimized spot weld layout model which increases fatigue life of spot weld and fatigue life of shock tower is determined.