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전자클러치를 이용한 전기식 파워 스티어링 시스템 동적 특성 해석
이종일(Jong-il Lee),부광석(Kwang-suck Boo),홍순영(Sun-young Hong) 한국자동차공학회 2003 한국자동차공학회 지부 학술대회 논문집 Vol.2003 No.5
The power steering system for vehicles is becoming essential for supporting the steering efforts of the drivers, especially for the parking lot maneuver of a vehicle.<br/> Electric Power Steeling EPS, system has attracted much attention for their advantages in terms of the economy and has been widely adopted as automotive power steeling equipment in recent vears.<br/> Most of EPS is developed so far using bi-directional motor to assist steeling torque. This type of EPS has a problem that it can not response rapidly for steering input like a abrupt turning because the motor has deadly-time for changing rotational direction.<br/> To solve the problem associated with the bi-directional motor, this paper proposes a new power steering system which is driven by uni-directional motor and its direction is controlled by electro-magnetic clutches. The motor of the new type of EPS rotates in only one direction and transmits steering torque in either the left or right direction. When the rotation is required the response time of the electro-magnetic clutches is shorter than one of the bidirectional motor. Thus, the new EPS produces precise steering ability and high energy efficiency.<br/> In this paper. a mathematical model of the type of electric power steering(EPS) system controlled by electro-magnetic clutches is presented and its dynamic characteristics is also investigated and analyzed for improving maneuverability of the EPS. The steering torque and the control ability could be also validated even under the various steering angle inputs.<br/> As the results of this study, a design parameter can be found out and is analyzed for improving the maneuverability so that the whole steering performance of the vehicle-steering system can be evaluated.<br/> If the above problems included in the conventional EPS are overcome by optimal design of the design parameters. the new type of EPS will improve stability and drive-ability of the vehicles.<br/>
Design of a Current Controller for MR CDC Dampers
이동훈(Dong Hun Lee),조봉근(Bong Geun Cho),이동락(Dong Rak Lee),부광석(Kwang Suck Boo) 한국자동차공학회 2007 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Semi-adaptive suspension systems require that the damper should control a damping coefficient. The MR damper is suitable for the damping coefficient. In this paper, a new current control algorithm has been proposed in order to control the current provided into a coil which produces a magnetic field in the MR(Magneto-Rheological) damper. The MR(Magneto-Rheological) damper is able to control a damping coefficient of the fluid through an orifice by using the MR fluid which has a characteristic of viscosity variation according to inducted current. In general, The MR CDC(Continuous Damping Control) damper has faster reponse time than other ones. However, the MR damper has disadvantage of time delay according to input command due to very large inductance of internal coil. A new robust lead compensation control algorithm is also able to provide more robust current control
액정면에 형성된 등온선의 가시화와 정량화를 위한 영상처리에 관한 연구
부광석,이대희,정재훈 인제대학교 1999 仁濟論叢 Vol.14 No.3
A new method to monitor a temperature distribution on the top surface of a plate by using a liquid crystal is developed in this research. We can monitor accurately the variations of the temperature distributions on the plate surface by measuring the RGB values of the liquid crystal which has a characteristic that its colors are changed via temperatures. Because the RGB values of the liquid crystal depend not only on the temperatures but also on a lighting condition, a new calibrating technique by utilizing neural network is proposed to obtain the relationship between the measured RGB values and the temperatures on the top surface of the plate. A neighborhood averaging filter is also designed to reduce uncertainties in measuring the RGB values of the liquid crystal. This developed temperature monitoring technique provides various accurate equi-temperature curves on the top surface of the plate from the RGB values measured by a color CCD camera through a computer monitor.