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RISS 인기검색어
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- 저자 : 임원식(Wonsik Lim) (검색결과 251 건)
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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.
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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.
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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.
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동력계 시험을 이용한 자동화 수동변속차량의 클러치 토크 분석
최우석(Woo-Seok Choi),임원식(Wonsik Lim),오덕수(Ducksoo Oh),박성천(Sung-cheon Park) 한국생산제조학회 2015 한국생산제조학회지 Vol.24 No.3
With the rise in oil prices and ongoing concerns about environment, there is an increased amount of interest in automated manual transmission (AMT) vehicles. Torque control in an AMT vehicle is attained by controlling the displacement of the dry-type clutchs actuator. To provide good ride comfort akin to that of an automatic transmission vehicle, the clutch control is vital to an AMT vehicle. In this study, a method of obtaining the clutch torque from a dynamometer test is devised. This method is able to identify the relationship between the displacement of the clutch actuator and the clutch torque. A simulator for estimating the performance of an AMT vehicle is developed using MATLAB Simulink. The results obtained from both the vehicle and simulation exhibit a similar trend.
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