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열탄성 불안정성을 고려한 원주면 마찰형 디스크 브레이크의 구조설계
송병철(Byoungcheol Song),강동헌(Dongheon Kang),김영희(Younghee Kim),박영철(Youngchul Park),이권희(Kwonhee Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Weight reduction for an automobile component has been sought to achieve fuel efficiency and energy conservation. In response to this trend, a new disc-brake called the circumferential friction disc-brake is suggested. This paper compares the mechanical performances of a conventional disc-brake and a suggested disc-brake, under the dynamic braking condition. The thermoelastic instability is considered to simulate the test condition. Furthermore, the metamodel using kriging interpolation method is introduced to obtain the optimum design of a suggested circumferential friction disc-brake. The design results obtained by the kriging method are compared with those obtained by the ANSYS.
타이어 다목적 최적설계를 위한 근사모델 생성에 관한 연구
송병철(Byoungcheol Song),이진환(Jinhwan Lee),김성래(Seongrae Kim),성기득(Kideug Sung) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Tire’s performance plays important roles in improving vehicle’s performances. Tire makers carry out a lot of research to improve tire’s performance. They are making effort to meet multi purposes performance using various optimization methods. Generally, the reason why we increase sampling points during optimization process, is to get more reliable approximation models, but the more we adopt sampling points, the more we need time to test. So it is important to select proper sampling points to balance between reliability and time consuming. In this research, we construct approximation models using three different number of sampling points and recommend proper orthogonal array adopt tire’s design optimization.
타이어 다목적 최적설계를 위한 메타모델 비교에 관한 연구
송병철(Byoungcheol Song),이진환(Jinhwan Lee),김성래(Seongrae Kim),성기득(Kideug Sung) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Performance of tire plays important roles in improving vehicle’s performances. Tire makers have been carrying out a lot of research to develop good performance tire. For example, they are trying to meet various purposes of tire using shape and structural design optimization method. In this research, we compare RSM and Kriging which are Curve Fitting Method and Interpolation Method, respectively. And then, proper metamodel is recommended.
타이어 성능 해석 자동화 및 최적화 프로세스 개발에 관한 연구
이진환(Jinhwan Lee),송병철(ByoungCheol Song),임종현(Jonghyun Lim),김성래(Seongrae Kim),성기득(Kideug Sung) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Tires should be satisfied various performances such as R&H, NVH, traction, and etc. To design tires considering these performances, we applied a multi-objective optimization method using metamodel to tires design and a finite element analysis to predict tire’s performances. However, building metamodel requires many repeatedly jobs for FEA in tire design optimization. In this study, to overcome these problems, we develped the FEA automation and design optimization process for tire design using commercial software Isight and the in-house code, and applied the process to a shape design optimization of tire contour to decrease tire`s rolling resistance to verify effects of the process from results of processing time.
정상상태 회전 해석기법을 이용한 타이어 회전저항 예측 기법 개발
김성래(Seongrae Kim),이경민(Kyungmin Lee),송병철(Byoungcheol Song),성기득(Kideug Sung) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Recently, we can not help considering environment-related performance during product developing process because environmental problem is biggest issue in most industrial field. So, automobile industry is making effort to meet enforced fuel efficiency standard of EU and NHTSA. It is well known that tires account for 4~7% of vehicle’s fuel efficiency. Rolling resistance caused rubber compound’s viscoelasticity characteristics is directly related with fuel efficiency among tire’s performances. To reduce rolling resistance, design examination for various contour and structure is needed through the estimation of rolling resistance. Finite element method is used a lot as a estimation method of rolling resistance, but most methods do not get quantitative result or need more calculating procedure because they use a theoretical or empirical formulation by inserting stress/strain values through the F.E.Analysis. In this study, we developed a rolling resistance estimation method of a tire applied rubber’s viscoelasticity. Steady-state rolling analysis method for a F.E.A., and prony series for viscoelasticity model was used. We investigated the correlation between rolling resistance and tire’s structural design variables, and verified accuracy of estimation method through comparing between test and F.E.Analysis.