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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
표면 온도 측정을 이용한 내부 결함 비파괴 검사 방법에 대한 연구
부광석,위철민 인제대학교 1999 仁濟論叢 Vol.14 No.3
This paper describes a new nondestructive testing method to find out a defect within a welded material. It is impossible to find whether there exist a defect such as a blowhole within the bonded material just by appearance. If there is a defect within the material, heat flow around the defect may be different with the case of the material with no defect. In this paper, the heat flow in the material with a defect is analyzed based upon heat conduction. A new method to detect a defect within the material is proposed based on the heat flow analysis. After heating the surface of the material for testing, we can detect whether there is a defect within the bonded part between two materials by the surface temperature measurement. This approach is applied on detecting defects in joining part of an oven bowl for an electiric rice cooker.