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박경진(Gyung-Jin Park),이광원(Kwang Won Lee),박영선(Kweon Hee Lee),이권희(Young Sun Park),김만식(Mahn-Shik Kim),이용래(Yong-Rae Lee),정태은(Tae-Eun Chung) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
Recently, electric vehicles have been developed in many places for various reasons. Although the stick model with beam clements is very convenient for the analysis and design, it may have significant errors due to the considerable simplifications. Especially, the difficulties exist at the modeling of joints, since the joints have complicated characteristics. In this research, a method for the joint modeling is suggested and verified. Beam elements are defined around a joint in the finite element analysis. The section properties of the joint elements are tuned to generate target responses by optimization. The target values are calculated by experiments or detailed analysis. The evaluated joints are be inserted in the full car model of an electrical vehicle.<br/>
박한석(Han-Seok Park),김종규(Jong-Kyu Kim),서선민(Sun-Min Seo),이권희(Kwon-Hee Lee),박영철(Young-Chul Park) 한국기계가공학회 2009 한국기계가공학회지 Vol.8 No.4
Recently developed automotive components are getting lighter providing a higher fuel efficiency and performance. Following the current trend, this study proposes a structural optimization method for the lower control arm installed at the front side of a Vehicle. Lightweight design of lower control arm can be achieved through design and material technology. In this research, the shape of lower control arm was determined by applying the optimization technology and aluminum was selected as a steel-substitute material. Strength performance is the most important design requirement in the structural design of a control arm. This study considers the static strength in the optimization process. For the optimum design, the durability analysis is performed to predict its fatigne life. In this study, the kriging interpolation method is adopted to obtain the minimum weight satisfying the strength constraint. Optimum designs are obtained by the in-house program, EXCEL-Kriging. Also, based on the optimum model obtained for the static strength, the optimization of Index of Fatigue Durability is carried out to get th optimum fatigne performance.
김종규(Jong-Kyu Kim),서선민(Sun-Min Seo),김영준(Young-Jun Kim),이동진(Dong-Jin Lee),이슬(Seul Lee),박영철(Young-Chul Park),이권희(Kwon-Hee Lee) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.5
The outer tie rod that is a part of steering system connects the steering gear to the steering knuckle via the inner tie rod. The formal study suggested the optimized structural design of an outer tie rod installed in a passenger car. Its weight is 284.7g, which is 57.2% lighter weight than initial steel model. This study validates the optimized design of the outer tie rod considering buckling and durability. The assembled unit of an inner tie rod and outer tie rod is utilized to perform the test of the bending strength of the outer tie rod. On the contrary, 1/2 car is utilized to perform the test of its durability performance.
황석철(Seok-Cheol Hwang),김종규(Jong-Kyu Kim),서선민(Sun-Min Seo),김영준(Young-Jun Kim),이동우(Dong-Woo Lee),박영철(Young-Chul Park),이권희(Kwon-Hee Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Ball joint is a rotating and swiveling element that is typically the interface between two parts. In an automobile, the ball joint is the component that connects the control arms to the steering knuckles by playing a role of bearing. The ball joint can also be installed in linkage systems for motion control applications. This paper describes the simulation strategy for a ball joint analysis, considering manufacturing process. Its manufacturing process can be divided into plugging and spinning. Then, the interested response is selected as the stress distribution generated between its ball and bearing. In this paper, a commercial code of NX DAFUL 2.0 using an implicit integration method is introduced to calculate the response. In addition, the gap analysis is performed to investigate the fitness. Also, the optimum design is suggested through case studies.
서부교(Seo, Bu-Kyo),김종규(Kim, Jong-Kyu),이동진(Lee, Dong-Jin),서선민(Seo, Sun-Min),이권희(Lee, Kwon-Hee),박영철(Park Young Chul) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.9
아우터 타이로드는 다른 차량 부품에 비해서 중량이 적지만, 차량 성능이 개선됨에 따라 부품의 수 및 중량 에 증가하는 추세에 있다. 그러므로 자동차 연비 향상을 위해서는 경량화가 필수적이다. 따라서 본 연구에서는 전기 자동차용 아우터 타이로드의 경량화 설계를 위한 기초연구로서 구조성능을 검토하기 위한 유한요소해석을 수행하였 다. 개발되는 아우터 타이로드의 재질은 일반 강을 이용하였고 좌굴 및 내구 성능을 검토하였다. 조향계 및 현가계 부품의 개발 시 관성력하중, 충격하중, 좌굴하중 및 내구하중에 의한 강도를 검토하는 것이 일반적이지만, 본 연구에 서는 극악한 하중으로 알려진 좌굴특성과 내구특성 만을 검토하였다. 또한 아우터 타이로드의 단면형상을 결정하는 파라미터를 설계변수로 정의하고 메타모델기반 최적화 기법을 적용하여 최적설계를 제시하였다. 그 결과 초기제품의 중량보다 9 % 감소를 실현하였다. Outer tie rod is lighter than other, but there is the trend item weight and the number is increasing due to vehicle performance improvement. Thus, to improve vehicle fuel efficiency, weight lightening is essential. Therefore, this research performed the finite element analysis to investigate the structural performance of the outer tie rod for an electrical vehicle. This study was performed as the preliminary study for a lightweight design of the outer tie rod. The weight of outer tie rod was optimized by adopting the steel material and applying the trial and error method. The strengths due to durability and buckling should be considered in the structural design of an outer tie rod. Furthermore, the meta model-based optimization was applied to obtain its lightweight design, leading to 9 % weigh reduction.