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이경수(K. S. Yi),서명원(M. W. Suh),오태일(T. I. Oh) 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.6
This paper deals with a robust semi-active control algorithm which is applicable to a semi-active suspension with a multi-state damper. Since the controllable damping rates are discrete in case of a multi-state semiactive damper, the desired damping rate can not be produced exactly even if force-velocity relations of a multi-state semi-active damper is completely known. In addition, damping characteristics of the semiactive dampers are different from damper to damper. A robust nonlinear control law based on sliding control is developed. The main objective of the proposed control strategies is to improve ride quality by tracking the desired active force with a multi-state damper of which the force-velocity relations are not completely known. The performance of the proposed semi-active control law is numerically compared to those of the control law based on a bilinear model and a passive suspension. The proposed control algorithm is robust to nonlinear characteristics and uncertainty of the force-velocity relations of multi-state dampers.
오광석(K. S. Oh),김학구(H. K. Kim),이경수(K. S. Yi),고경은(K. E. Ko),김판영(P. Y. Kim),서자호(J. H. Seo) 유공압건설기계학회 2014 드라이브·컨트롤 Vol.11 No.2
This paper presents simulation-based analysis of energy flow of a wheel loader. The objective of this study is to analyze the energy flow of a wheel loader during driving and working. Because the wheel loader powertrain consists of a mechanical and hydraulic powertrain, the generated power from the engine is divided into 2 powertrains. Further, a virtual prediction of energy flow in the powertrains is a key factor in terms of optimal design. Accordingly, the simulation model that is able to predict the virtual energy flow is developed and analyzed in this study. The proposed wheel loader simulation model has been constructed in the Matlab/Simulink environment. It is expected that the developed simulation model will analyze the energy flow and efficiency in the design stage.
유정겸(J.K.Yu),신동훈(D.H.Shin),오광석(K.S.Oh),윤지원(J.W.Yoon),이경수(K.S.Yi) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
This paper presents a simplified tractor model which is developed based on a resonance analysis of a real tractor. Since two most interesting behaviors in relation to resonance are vertical vibration and pitch motion, this paper focuses on the analysis of resonance characteristics with respect to these two behaviors. In order to analyze the two resonance characteristics easily, half tractor model and quarter tractor model are introduced. These models consist of three parts: seat, cabin, tractor body. The results from the analysis are validated by comparing simulation results with experiment data.
송철기(C. K. Song),김성하(S. H. Kim),이경수(K. S. Yi) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.5
Collision warning systems have been an active research and development area as the interests and demands for ASV's (Advanced Safety Vehicles) have increased. This paper presents an experimental investigation of a collision warning system for automobiles. A collision warning HiLS (Hardware-in-the-Loop Simulation) system has been designed and used to test the collision warning algorithm, radar sensors, and warning displays under realistic operating conditions in the laboratory. The collision warning algorithm is operated by a warning index, which is a function of the warning distance and the braking distance. The computer calculates velocities of the preceding vehicle and following vehicle, relative distance and relative velocity of the vehicles using vehicle simulation models. The relative distance and the relative velocity are applied to the vehicle simulator controlled by a DC motor.<br/>
우민수(M.S.Woo),이경수(K.Yi),김성하(S.H.Kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2
Collision warning/avoidance systems have the potential to substantially reduce the frequency and severity of accidents. The collision warning/avoidance systems, and adaptive cruise control systems are currently under development by most automotive manufacturers around the world. This paper presents a brake control for a collision avoidance(CA) system. The proposed brake control has been compared to a simple CA algorithm which use on/off binary brake control. Nonlinear control techniques have been used to minimize driver discomfort during braking in a CA system.<br/>
[ITS부문] 차량충돌 회피 시스템을 위한 비선형 브레이크 제어
조영주(Y.J.Cho),이경수(K.S.Yi) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents a nonlinear brake control for vehicle collision avoidance(CA) system. For the control of a brake system. we introduced a solenoid valve controlled brake actuator and a hydraulic brake system. To minimize driver discomfort during braking in a CA system. it is important to have the acceleration profile as smooth as possible. The proposed nonlinear brake control technique has been compared to a simple CA algorithm which use on/off binary brake control.
[차량운동성능부문] 상태변수/노면입력 관측기를 이용한 반능동 현가시스템 제어
김정헌(J.H.Kim),이경수(K.S.Yi) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper deals with an observer-based preview control for semi-active suspensions. An Observer has been designed such that all the state variables and road inputs can be estimated from accelerations<br/> Since the road input to the rear wheels is a delayed version of that to the front wheels. it can be obtained by estimating of the road input to the front wheels without preview sensors. The performance of LQ optimal control and the wheelbase preview control using the estimated values of state and the estimated road input has been investigated. The results show that the observer-based control can provide good performance. The observer-based preview control improves the dynamic behavior of the rear axle and that of pitch motion compared to the LQ optimal control.