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차량 NVH 개선을 위한 Powertrain mounting boss stiffness 관한 연구
조미희(Mihui Jo),유영우(Yeongwoo Yoo),장성식(Seongsik Jang) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This study is powertrain mounting boss stiffness analysis for improving vehicle NVH. This paper describes a procedure to calculate the Free-Free boss stiffness of powertrain mounting bosses using a finite element model of the full powertrain. For individual boss stiffness analysis, inertia relief method is used in this study. The predicted individual boss stiffness is used for design evaluation of boss stiffness to improve vehicle NVH, and boundary conditions in a component mounting bracket modal analysis. Composite boss stiffness analysis is to improve stiffness assessment of a set of bosses, by replacing the assessment of individual bosses with the combined effects of their stiffness and their relative location.
Road Load 및 AT shift pattern에 의한 차량 연비 및 동특성 거동에 관한 고찰
정영재(Youngjae Jung),유영우(Yeongwoo Yoo),류춘근(Chungeun Ryu),장호준(Hojun Jang),배구병(Kubyoung Bae) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
This paper focuses on fuel economy and acceleration performance of vehicle using powertrain dynamometer with road load simulator. The engine and transmission are equally controlled to vehicle by configuration which is equipped with real engine, real transmission with torque convertor and throttle actuator and so on. It is easy to find the effect of road load and shift pattern of auto transmission on powertrain dynamometer by eliminating driver variables of vehicle and real road. All of boundary conditions except road load or shift pattern is surely kept to analyze clearly the effect of road load or shift pattern. After testing, it is possible to easily compare results of fuel economy and acceleration performance with all kinds of combinations. This test method which uses powertrain dynamometer is allowed to shorten the development time without vehicles.
김재영(Jaiyeong Kim),유영우(Yeongwoo Yoo),장성식(Seongsik Jang) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
Drivers of modern era prefer to drive the vehicle more comfortable and efficient way. DMF is the most innovative device which transmits the reduced exiting force from engine to drivetrain that applies to many passengers vehicle. However, some load devices i.e. A/C, electric components and so on can produce some unexpected loads to the engine which will cause the DMF abnormal RPM fluctuation. In order to resolve this matter, I proposed the investigations of an analytical model which many made by inertia, stiffness and damper. Number of cases are simulated. Design parameters such as Hysteresis, F.P angle and Primary inertia are the most influential parameter to produce DMF rattle noise. For the accurate result, the model will be upgraded and complicated in further study.
1D Dynamic 해석 기법을 이용한 수동 변속기 클러치 시스템 열전달 예측 모델에 관한 연구
정영재(Youngjae Jung),유영우(Yeongwoo Yoo),장성식(Seongsik Jang),김윤수(Yunsoo Kim) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This paper deals with simulation method of heat transfer behaviors on manual gearbox equipped with the clutch system and finds the application plan for vehicle development stage. Particularly the estimation of vehicle dynamic motion is carried by MATLAB-Simulink model and clutch heat transfer behavior can be simulated by clutch thermal model based on AMESim & C-code scripts. And this paper introduces that how vehicle condition, clutch operation maneuver and other environment variables affect to the vehicle dynamic motion with sensitivity level in detail. In the second place, the method of clutch thermal model establishment is introduced with general heat transfer theory. The reliability of simulation model is mostly important so the correlation results between actually measured temperature and simulation results are also explained. Additionally this study can provide the design guide line for each clutch components to secure design robustness including expected warranty mileage. Lastly this simulation method is taken center stage due to high confidence level within short time and it also can be utilized for optimization of vehicle specification.
3D 유동 해석을 사용한 변속기 내부의 Baffle 유, 무에 따른 Spin loss에 대한 연구
김재영(Jaiyeong Kim),유영우(Yeongwoo Yoo),문성채(Sungchae Moon) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Energy efficiency is very important to modern vehicles. The new vehicle developing concept is moving to more efficient car like Hybrid, electric vehicle and fuel cell considering about efficiency significantly. In electric vehicle, spin loss is more important to increase power efficiency and battery life due to the limited battery capacity. To reduce Spin loss, there are many factors to control and design. One of the method is to build some components in the gear box. In this study, using common analysis tool to verify the effect of baffle plate in terms of improving the efficiency. Improved values are obtained to meet more efficient on this drive system. For the accurate result, this result will be defined by test and complicated in further study.
1D 해석 기법을 이용한 변속기 회전 손실 특성 및 오일 레벨 최적화에 관한 연구
김재영(Jaiyeong Kim),유영우(Yeongwoo Yoo),장성식(Seongsik Jang) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Energy efficiency is very important to modern vehicles. The new vehicle which alter internal combustion vehicle such as Hybrid, electric vehicle and fuel cell consider about efficiency significantly. In electric vehicle spin loss is important to increase power efficiency and battery life. To reduce Spin loss there are many factor to control and design. One of the method to decrease the loss is to balance the oil level in the gear box. In this study, using common theoretical formula and some estimation to calculate spin loss for electric vehicle drive system. Some specific level can be achieved to meet more efficient on this drive system. For the accurate result, this method will be upgraded and complicated in further study.
1D 해석을 이용한 수동 변속기 클러치 페달 특성 최적화 기법에 관한 연구
정영재(Youngjae Jung),유영우(Yeongwoo Yoo),장성식(Seongsik Jang) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
This paper deals with 1D simulation method of clutch pedal characteristics and optimization strategy for the manual gearbox. Most of clutch system is consist of mechanical parts and hydraulic components to transfer pedal force until diaphragm spring on clutch cover system. It is very important to predict mechanical friction and hydraulic loss for the exact pedal behavior. The general mechanism will be dealt on the first half with introduction and simulation method will be followed. This simulation is based on MATLAB and AMESim 1D analysis tools and correlation results are also shown on conclusion section. Particularly the major parameters which make the highest influences to the pedal characteristics will be studied and design target values will be also provided to obtain the optimized pedal reaction behavior for potential customers. Once the simulation model is correlated, this method will be taken center stage with high confidence level and it can be utilized for design determination and optimization with less cost and time.
클러치 Misuse에 의한 수동 변속기 Abuse Load Simulation
정영재(Youngjae Jung),유영우(Yeongwoo Yoo),장성식(Seongsik Jang),김윤수 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
In recent years, many automotive companies have been striving to reduce costs and shorten new vehicle development cycle time. To develop a new vehicle costs a tremendous amount. So currently reliable simulation method is an attractive alternative to reduce real vehicle tests and development cost. This paper deals with the equation of motion and simulation method for vehicle system level especially focused on abuse load of manual transmission. It is can be carried out by the dynamic 1-D model based on MATLAB-Simulink. To get the abuse load on specific driving condition, the most important thing is the simplification of vehicle components and motion. Because the more complex model, the more input parameters requested. Unexpected abuse load which frequently comes from unintended driver’s clutch operations is very important to reflect the proper safety factor for powertrain driveline parts on design and development stage. And this simulation method also allows to catch very small effects came by parts modification or weight changes without real vehicle tests. So the method can be used for abuse load simulation during the vehicle development stage across the board.
수동변속기 오일 윤활에 대한 실험과 CFD 해석을 통한 오일거터의 최적화
하정완(Jeongwan Ha),박세경(Saekyung Park),유영우(Yeongwoo Yoo),김동찬(Dongchan Kim),장성식(Seongsik Jang),Shachindra Dongaonkar 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Lubrication is one of the core design factor in transmission development. Abrasion and friction heat are inevitable in transmission which produced by relative motion between parts to produce driving force. This is most important factor which affect to transmission durability and functional performance. Thus, adequate amount of lubricant supply to transmission is core design factor which can prevent viscosity drop by limitation of friction heat. Transmission fluid is responsible for cooling and lubrication of transmission, and assist normal system operation by helping smooth interaction between parts. To verify oil flow inside of transmission which has a significant role in transmission system, actual testing is required but it takes many trial and error stage and man-hour & time consumption. Thus, CFD is used to analyze fluid dynamic and oil flow to specific location first and then final actual test performed to minimize this kind of loss when determining fluid specification. This paper is believed to be optimization of Oil gutter for Oil lubrication of Transmission from experiment and CFD analysis.