http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
하이브리드 철도차량용 주행 성능 시뮬레이터에 관한 연구
임원식(Wonsik Lim),정춘화(Chunhua Zheng),신창우(Chang Woo Shin) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
HEV(Hybrid Electrical Vehicle)s are considered as one of the next generation vehicles. To develop the HEV, there must be a reliable simulator, by which the capacities of the power sources are tested, and the parameters of the HEV are optimized before developing the real model of the HEVs. This process can save money for designing the HEV system and improve the system without experiments. Nowadays, traction of railway vehicles is usually provided by diesel fuel combustion. Hybridization offers the potential to achieve a step change in energy efficiency and we also need to develop simulators for performance test of hybrid railway vehicles. In this paper, the type of hybrid drive system is introduced, the characteristics of railway series hybrid system are compared with those of series hybrid vehicle system. A couple of simulators for performance test of HEV are introduced, the idea of constructing railway series hybrid system simulator using MATLAB SIMDRIVELINE is also introduced.
로드휠의 슬립을 고려한 군용 궤도차량의 조향특성에 관한 연구
임원식(Wonsik Lim),윤재섭(Jaeseop Yoon),강상욱(Sangwook Kang) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.2
In this paper, the steering characteristics of tracked vehicles are studied for the improvement of steering performance. The important design factor of military vehicles is high mobility. It is influenced by weight of a vehicle, engine capacity, power-train, and steering system. The military vehicle, which is equipped with caterpillar, has unique steering characteristics and is quite different from that of a wheeled vehicle. The steering of tracked vehicles is operated in the power pack due to different speeds of both sprockets. Under cornering conditions, power split and power regeneration are happened in the power pack. In case of power regeneration, power is transferred outside track after adding engine power and power inputted inside track from the ground. However, excessive power regeneration is transferred in the power pack. It damages mechanical elements. Therefore, it is necessary to analyze the steering system and check mentioned problem above. In this study, the detailed dynamic model of steering system is presented, which includes slippage between track and roadwheel, inertia force, and inertia moment. Finally, our model is compared with the Kitano model and we verified the validity of the model.
자동변속기의 과도특성 분석을 위한 토크 컨버티의 변동 파리미터 성능 모델 개발
임원식(Wonsik Lim),이진원(Jinwon Lee) 한국자동차공학회 2002 한국 자동차공학회논문집 Vol.10 No.1
To enhance the acceleration performance and fuel consumption rate of a vehicle, the torque converter is modified or newly-developed with reliable analysis model. Up to recently, the one dimensional performance model has been used for the analysis and design of torque converter. The model is described with constant parameters based on the concept of mean flow path. When it is used in practice, some experiential correction factors are needed to minimize the estimated error. These factors have poor physical meaning and cannot be applied confidently to the other specification of torque converter. In this study, the detail dynamic model of torque converter is presented to establish the physical meaning of correction factors. To verify the validity of model, performance test was carried out with various input speed and oil temperature. The effect of oil tempera-ture on the performance is analysed, and it is applied to the dynamic model. And. to obtain the internal flow pattern of torque converter, CFD(Computational Fluid Dyanmics) analysis is carried out on three-dimensional turbulent flow. Correction factors are determined from the internal flow pattern, and their variation is presented with the speed ratio of torque converter. Finally. the sensitivity of correction factors to the speed ratio is studied for the case of changing capacity factor with maintaining torque ratio.
공진형(Jinhyung Kong),임원식(Wonsik Lim),박영일(Yeongil Park),김정윤(Jungyun Kim) 한국자동차공학회 2008 한국 자동차공학회논문집 Vol.16 No.4
Semi-spherical CVT(SS-CVT) is one of friction drives, which transmits power via the friction force between a spherical shaped variator and output disks. The variator varies the speed ratio of SS-CVT continuously as well as transmits input power into the output shaft. Therefore two friction forces are normally applied on the variator; one is the longitudinal friction force for power transmission and the other is the lateral for shifting. In order to investigate the dynamic behavior of SS-CVT, we introduced a numerical model of 2-dimensional friction force using a function of slip ratio and slip angle. And a dynamic model, which describes the shifting mechanism of SS-CVT, is developed through 3-dimensional vector analysis. Finally we presented numerical results of the shift characteristics focused on the transient behavior of the variator’s slip ratio and slip angle. The numerical results also show the typical CVT shifting characteristics of SS-CVT and stable shifting behaviors of the variator.
습식 클러치의 고정 시간 솔버 기반 동적 거동 해석 기술 개발
서호원(Howon Seo),임원식(Wonsik Lim),차석원(Suk Won Cha),강상욱(Sangwook Kang),공진형(Jinhyung Kong) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Almost every modern vehicle has an automatic transmission(or power split device in case of Toyota Prius HEV)which is constructed with planetary gears and wet clutches. It is important to develop a model which can analysis dynamic state of clutch in shifting phase to evaluate performance of control logics. The model needs to be simulated in real time or semi-real time because every TCU is operating in fixed time step. Dynamic analysis simulation software like MSC.ADAMS or AMESIM does not satisfy real time performance. This research suggests a clutch analysis method that determines stick and slip state of clutches in an automatic transmission based on fixed step solver. A simulator model is constructed as a reference using MATLAB/SIMULNK simdriveline library. Result of simulator model is also compared with result of fixed time step analysis model.