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기하학적 형상분석을 이용한 토크 컨버터 성능 모델 근사화 방법 제시
이병길(ByungGil Lee),하승범(SeungBeom Ha),김범수(BeomSoo Kim),임원식(WonSik Lim),이장무(JangMoo Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
One dimensional performance model has been used for the design of torque converter. The model is based on the concept of constant mean flow path and constant flow angle. These constant-assumed parameters make the design procedure to be simple. The constant mean flow path has two conditions that one of them is the path of assumed mean effective flow satisfied with a half of fluid flow area and the other things is the design path crossed each element line orthogonally. But these conditions cannot be satisfied in practice, so it makes a error between the prediction of one dimensional performance model and the result of test. In this study, the new approaching method of one dimensional performance model is presented to reduce the error. This method defines the concept of new line distinguished with element line and assumes the equivalent blade angle.
김정훈(Junghoon Kim),이호원(Howon Lee),이장무(Jangmoo Lee),유동호(Dongho Yoo) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
For shimmy vibration analysis, a mathematical theory model has been considered and the dynamic characteristics of full vehicle has not been considered in most researches. In this study, based on the results obtained from the quasi-static analysis of 10 dof suspension theoretical model, multi-body dynamic analysis considering shimmy vibration of the steering wheel is performed and compared with the results of MSC/ADAMS. Also, modal analysis results using front suspension system of 32 dof theoretical model agree with modal test results. Based on the results obtained from the modal test using CADA-X program, several design parameter have been found. Through simulations using MSC/ADAMS, it has been found that the shimmy vibration can be improved by changing the bush stiffness of the front suspension. In the end, the design process on the steering/suspension development is suggested for the analysis of shimmy vibration.
[동력전달계] 무단변속기 장착 차량의 커플링 기부별 발진 성능 해석
김정윤(Jungyun Kim),조형준(Hyoungjun Cho),이장무(Jangmoo Lee),임원식(Won Sik Lim) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1999 No.11_2
To reduce the drive-line torsional vibration, some torsional coupling devices were used for the passenger car equipped a CVT with the wet type multi-plate clutch as a starting device. This paper describes the behaviors of a passenger car using a Belt-type CVT (Continuously Variable Transmission) that has different torsional coupling devices: a solid mass flywheel with torsional damper and a dual mass flywheel, focusing in the launching characteristics. The launching characteristics, considered here, are the acceleration performance and the creep characteristic. By using the mathematical models of this systems, the launching characteristics for different types of torsional coupling devices were investigated through the driving simulation, which developed in the previous study.
최장훈(JangHoon Choi),강상욱(SangWook Kang),이장무(JangMoo Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Free vibraton Analysis by Non-dimensional Influence Function (or NDIF) is extended from circular shaped plates to arbitrarily shaped plates. The indefinite normal direction and concentrated forces at the corner of rectangular plates make it difficult to apply NDIF to rectangular. Besides, the straight edges make the use of local polar coordinate impossible. This problem is solved by a new method that uses Cartesian coordinate and new boundary conditions at corner .The proposed method provides reliable natural frequencies and mode shapes for various polygons which accord with those given by an exact method or FEM(ANSYS).
양호림(Yang, Horim),전순일(Jeon, Soonil),박영일(Park, Yeongil),이장무(Lee, Jangmoo) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
In this research, we presented the regenerative braking algorithms considering fuel economy and charging oftenness, and also analyzed these algorithms. The first algorithm was the regenerative braking algorithm for the ideal recovery of kinetic energy. The HEV using this algorithm had high fuel economy, on the other hand frequent charging was occurred. The second algorithm was the regenerative braking algorithm for reduction of the charging oftenness. Using this algorithm, the HEV had the low charging oftenness and small loss of fuel economy.
[동력전달계부문] 에너지 평형식을 기초로 한 하이브리드 차량의 엔진/모터/배터리 용량 매칭
전순일(Soonil Jeon),조성태(Sungtae Jo),박영일(Yeong-il Park),이장무(Jangmoo Lee) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_2
In HEV(hybrid electric vehicle) that has usually two power sources such as chemical and electric energy, It is an important and difficult issue to quantify the fuel-economy, however, there is no standard method. In this paper, we present the fuel-economy improvement index a of HEV against baseline ICV(internal combustion vehicle). Namely, this index is not absolute value but relative value. For this purpose, first, we assume that the engine of ICV operates at only one point. From the reasonable result of this assumption, we assume that the engine of parallel HEV operates at two points, discharging and charging points, which can be selected to satisfy energy balance relation that makes the total consumed energy from battery in discharging be equal to the total stored energy into battery in charging. Second, through these assumption, we can obtain 3-D fuel-economy improvement index map, a map will two non-dimensional variables, that is, the discharging time over total time and the engine power in discharging over average required power in driving. Finally, we obtain the 3-D a map of parallel HEV according to its engine, motor, and battery sizes in urban and highway driving cycles, and use these results to select the most appropriate component size.