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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.
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.
정성필(Sung Pil Jung),박태원(Tae Won Park),정원선(Won Sun Cheong) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.2
본 논문에서는 플랫 타입 블레이드를 장착한 와이퍼 시스템의 성능을 예측하기 위한 동역학 해석방법을 제시하였다. 고무 재질로 이루어진 블레이드는 비선형의 특성을 갖기 때문에, 블레이드의 동적 특성을 나타내기 위하여 모달 좌표계와 절대 절점 좌표계를 이용하였다. 블레이드 단면의 굽힘 특성을 파악하기 위해 블레이드에 대한 구조 해석을 실시하였다. 해석 결과에 따라 블레이드 단면을 강체, 유연체 및 대변형체의 3 부분으로 구분하였다. 모달 좌표계와 절대 절점 좌표계를 이용하여 블레이드 단면의 유연체 및 대변형체를 표현하였다. 동역학 해석 결과를 검증하기 위해 실험을 실시하였고, 결과비교를 통해 본 연구에서 생성한 블레이드에 대한 유연 다물체 모델의 신뢰성을 검증하였다. This paper presents the dynamic analysis method for estimating the performance of flat-type blades in wiper systems. The blade has nonlinear characteristics since the rubber is a hyper-elastic material. Thus, modal coordinate and absolute nodal coordinate formulations were used to describe the dynamic characteristic of the blade. The blade was structurally analyzed to find the bending characteristics of the cross section of the blade. According to the analysis results, the blade section is divided into three deformation bodies: rigid, small, and large. For the small deformation body, the modal coordinate formulation is used, while the absolute nodal coordinate formulation is used for the large deformation body. To verify the dynamic analysis result, an experiment was performed. The simulation and experiment results were compared to verify the flexible multi-body dynamic model.
서킷 주행 조건을 고려한 고성능 타이어의 내구 성능 평가 방법
정성필(Sung Pil Jung),박재현(Jae Hyun Park) 한국자동차공학회 2017 한국자동차공학회 부문종합 학술대회 Vol.2017 No.5
Demand for high-performance automobiles is increasing due to the recent increase in imported cars and increased interest in car tuning. High-performance automobiles are equipped with large-width tires with low flatness and high stiffness of the sidewall to increase the treading force with the ground and to ensure posture stability when turning. Heat generation by friction between the tire and the ground and internal heat generation by repetitive bending of the sidewalls are the main causes of weakening the durability of tires. In particular, this durability weakness is maximized during circuit driving, and most high-performance vehicle and tire manufacturers are ensuring the durability of tires by running tests on the circuit prior to product launch. However, it is not easy to evaluate the durability of a tire in a circuit. Above all, high-speed of 200 km/h or more continues, so that much heat is generated in the vehicle corner module including the brake, and data measurement using a sensor such as a WFT(Wheel Force Transducer) is almost impossible. In this paper, the 6-axis load and the 3-axis angles acting on the tire at the circuit were calculated using the vehicle dynamics model. Based on this data, we developed the circuit simulation method by using drum type tire durability tester. The reliability of the developed endurance test mode was verified through comparison with actual vehicle test results.