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최승복(S. B. Choi),최영태(Y. T. Choi),박우철(W. C. Park),정재천(C. C. Cheong),서문석(M. S. Suh),여문수(M. S. Yeo) 한국자동차공학회 1996 한국 자동차공학회논문집 Vol.4 No.6
This paper presents control and response characteristics of a continuously variable ER(electro-rheological) damper for small-sized vehicles. The ER damper is devised and its overning equation of motion is derived from the bond graph model. The field-dependent yield shear stresses are distilled from experimental investigation on the Bingham property of the ER fluid. The distilled data are incorporated into the governing system model and, on the basis of this model, an appropriate size of the ER damper is manufactured. After evaluating the field-dependent damping performance of the proposed ER damper, the skyhook control algorithm is formulated to achieve desired level of the damping force. The controller is then experimentally implemented and control characteristics of the ER damper are presented in order to demonstrate superior controllability of the damping force. In addition, response characteristics of the damping force with respect to the electric field with fast on-off frequency are provided to show the feasibility of practical application.<br/>
김기선(K. S. Kim),장유진(Y. J. Chang),최승복(S. B. Choi),정재천(C. C. Cheong),서문석(M. S. Suh),여문수(M. S. Yeo) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.6
This paper presents performance investigation of a continuously variable ER(Electro-Rheologi-cal )damper for passenger vehicles. A dynamic model of the damper is formulated by incorporating electric field-dependent Bingham properties of the ER fluid. The Bingham properties are experimentally obtained through Couette type electroviscous measurement with respect to two different particle concentrations. The governing equation of the hydraulic model treating three components of fluid resistances ; electrode duct flow, check valve flow and piston gap flow, is achieved via the bond graph method. A prototype ER damper is then designed and manufactured on the basis of parameter analysis. The damping forces of the system are experimentally evaluated by changing the intensity of the electric field, the particle concentration and the electrode gap.
장유진(E.Chang),최영태(Y.T.Choi),정원식(W.S.Cheong),최승복(S.B.Choi),서문석(M.S.Suh),여문수(M.S.Yeo) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
.This paper presents a novel type of a semi-active suspension system featuring ER(electro-theological) damper. Firstly, an ER fluid is composed and its Bingham property is tested as a function of an electric field. Governing equations of motion or the ER damper are derived by considering field-dependent yield stress, followed by the design and manufacturing through performance analysis. A semi-active suspension system is then formulated and its dynamic characteristics are evaluated via several control algorithms. It is show that the proposed method is very effective for the improvement of the vibration isolation.<br/>
권길식,손병진,여문수,윤선주,Kwon, K.S.,Son, B.J.,Yeo, M.S.,Yoon, S.J. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.2
In this study, one-dimensional Stefan problem with air-gap resistance in the rectangular mold is considered and the thermal characteristics are examined by using the enthalpy-based simple implicit finite-difference scheme. The enthalpy and temperature are nondimensionalized to obtain general solutions. The temperature distribution and the locations of solidus and liquidus line are obtained and the effects of major parameters on the thermal characteristics are investigated.
서영덕(Y. D. Seo),여문수(M. S. Yeo),이승종(S. J. Yi) 한국자동차공학회 1998 한국 자동차공학회논문집 Vol.6 No.5
Recently, TCS(Traction Control System) is attracting attention, because it maintains trac-tion ability and steerability of vehicles on low- μ surface roads by controlling the slip rate between tire and road surface. The development of TCS control law is difficult due to the highly nonlinearity and uncertainty involved in TCS. A fuzzy logic approach is appealing for TCS. In this paper, fuzzy logic controller for TCS is introduced and evaluated by the com-puter simulation with 8 DOF vehicle model. The results indicate that the fuzzy logic TCS improves vehicle's stability and steerability.<br/>