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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.
관측기를 이용한 차량의 무게 추정 및 반능동 현가시스템의 적응제어
정기윤(K.Y.Jeoung),이경수(K.Yi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
In this study, adaptive control of semi-active suspensions has been investigated to improve ths performance of semi-active suspensions. An observer for semi-active suspensions that uses only the sprung mass and unsprung mass accelerations was designed and an observer-based sprung mass identifier was developed. The estimated sprung mass is used in gain tunning of the controller for compensation of the change of the vehicle sprung mass. It has been shown by Lyapunov stability analysis that the identifier is stable.
[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.