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정성필(Sung Pil Jung),박태원(Tae Won Park),조재익(Jae Ik Cho),정기범(Gi Beom Jeong),정원선(Won Sun Chung) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In this study, a transient FE analysis method was used to analyze the fully coupled thermo-mechanical problem for a disc brake system. Mechanical and thermal model for the disc brake were generated separately, and solved iteratively. Three dimensional FE model of a disc brake was created. The mechanical model of the disc brake was assumed to be in braking with an acceleration of 0.3g from 1400 rpm to 700 rpm. The thermal model with an initial temperature of 80℃ interacts with the mechanical model, and the friction heat between the pad and disc is generated by the friction contact condition. Due to the heat generation, the material of disc is expanded and alters the contact condition.
정성필(Sungpil Jung),전갑진(Kabjin Jun),이수호(Suho Lee),우준성(Junseong Woo),박태원(Taewon Park),윤재호(Jaeho Yoon) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is very difficult to estimate the braking performance of a vehicle because brake system includes many parts such as a booster, a master cylinder, a valve and so forth. To calculate the braking characteristics such as braking force through the real vehicle test requires much time and cost. Therefore, the development of the way to estimate the braking performance of a vehicle with computational methods is needed. In this paper, a program which can analyze the whole braking capabilities of a vehicle is presented. Since all input and output data are composed of the Microsoft Excel format, it is easy to manage design data and found the data base. It is considered that the braking characteristics against the variation of booster vacuum pressure are changed when a vehicle is under braking. Furthermore, the additional postprocessor not only makes the graph presentation of the result data but also generates the Excel result files for the report.
MATLAB 을 이용한 유연 다물체 시스템의 해석 및 제어
정성필(Sung Pil Jung),박태원(Tae Won Park) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.5
In this paper, analysis and control of the flexible multibody system using MATLAB is presented. The equations of motion of a flexible body are derived in terms of the modal coordinate. The rigid-flexible multibody dynamic solver is developed. Finite element information required to analyze motion of flexible bodies is imported from ANSYS. The modified finite element data, such as modal mass matrix, modal stiffness matrix and constraint mode shapes, is calculated in the solver. Since the solver is developed using MATLAB, it is very easy to connect with SIMULINK which is widely used to control motion of the multibody system. Several simulations are implemented to verify the developed solver. A control example is carried out and the usefulness of the developed solver is demonstrated.
유한 요소 해석 기법을 이용한 고속 철도 차량의 집전 성능 해석
정성필(Sung Pil Jung),박태원(Tae Won Park),김영국(Young Guk Kim),박찬경(Chan Kyoung Park),백진성(Jin Sung Paik) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.7
본 논문에서는 상용 유한 요소 해석 프로그램인 SAMCEF 를 이용하여 고속 철도 차량의 집전성능을 예측할 수 있는 해석 모델을 개발하였다. 3 자유도 스프링-댐퍼-질량의 판토그래프 모델을 생성하였고, 실제 시스템과의 리셉턴스를 비교함으로써 신뢰성을 검증하였다. UIC 799 OR 기준에서 제시한 가선계의 이론적 파동전파 속도와 가선계 유한 요소 해석 모델에서 측정한 파동 전파 속도를 비교 하였다. 드로퍼의 길이를 조절하여 전차선의 중력에 의한 초기 처짐 현상을 구현하였다. 가선계와 판토그래프를 접촉 요소를 이용하여 연성하였으며, 판토그래프가 300 ㎞/h 및 370 ㎞/h 로 주행할 때의 접촉력 변화를 도출하였다. 접촉력의 평균, 표준편차, 최대 및 최소값 등을 분석함으로써 본 논문에서 제시한 해석모델의 유효성을 검증하였다. In this study, a simulation model to estimate the current-collection performance of a high-speed train was developed by using a commercial finite element analysis software, SAMCEF. A three-dimensional springDdamperDmass model of a pantograph was created, and its reliability was validated by comparing the receptance of the model to that of the actual pantograph. The wave propagation speed of the catenary model was compared with the analytical wave propagation speed of the catenary system presented in the UIC 799 OR standard. The length of the droppers was controlled, and the pre-sag of the contact wire due to gravity was considered. The catenary and the pantograph were connected by using a contact element, and the contact force variation when the pantograph was moved at velocities of 300 ㎞/h and 370 ㎞/h was obtained. The average, standard deviation, maximum, and minimum values of the contact force were analyzed, and the effectiveness of the developed simulation model was examined.