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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.
김영훈(Y. H. Kim),김민수(M. S. Kim),최동훈(D. H. Choi),유홍희(H. H. Yoo),김종수(J. S. Kim),김재용(J. Y. Kim),서문석(M. S. Suh) 한국자동차공학회 1995 한국 자동차공학회논문집 Vol.3 No.2
In this study a tracked vehicle is idealized as a 2-dimensional 9-degrees-of-freedom model which takes into account the effects of HSU units, torsion bars, and track. For the model equations of motion are derived using Kane's method. By using the equations of motion, a numerical example is solved and results are compared to those obtained by using a general purpose multibody dyriamic analysis program. The comparison study shows the reasonable coherence between the two results, which confirms the effectiveness of the model. With the model, dynamic response optimization is carried out. The objective function is the peak value of the vertical acceleration of the vehicle at the driver's seat, and the constraints are the wheel travel limits, the ground clearance, and the limits of other design variables. Three different sets of design variables are chosen and used for the optimization. The results show the attenuation of the acceleration peak value. Thus the procedure presented in this study can be utilized for the design improvement of the real system.
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/>
최승복(S. B. Choi),정재천(C. C. Cheong),최용빈(Y. B. Choi),허승진(S. J. Heo),서문석(M. S. Suh) 한국자동차공학회 1993 한국 자동차공학회논문집 Vol.1 No.1
This paper presents some inherent characteristics of a semi-active variable damper featuring an electro(ER) fluid. The damping force of the damper can be selectively adjusted or controlled by employing electric field to the ER fluid domain. This is possible owing to the pressure drop across the piston occured by field-dependent variable yield stress of the ER fluid. This is fundamentally different than the performance of a conventional adjustable viscous damper. To demonstrate the effectiveness and superiority over the conventional one, the proposed damper is incorporated with a suspension system. A quarter car model with the suspension system is formulated and represented by a state equation. By choosing numerical values based on realistic package size, power requirements and suitable ER properties, the performance characteristics of the suspension system are obtained and evaluated in both frequency and time domains. The effects of constant electric field and on-off controlled electric field which relates to the damping force are also examined.<br/>
김기선(K.S.Kim),장유진(E.Chang),최승복(S.B.Choi),정재천(C.C.Cheong),서문석(M.S.Suh) 한국자동차공학회 1994 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The ER fluid-filled damper characterizing continous modulation of the damping force is devised and experimetally realized. The governing equation of the hydraulic model is obtained through a bond graphic method. The performance of the ER damper is evaluated with respect to the electric field strength.<br/>
최동훈(D.H.Choi),김영훈(Y.H.Kim),김민수(MI.S.Kim),유홍회(H.H. Yoo),김재웅(J. Y.Kim),김종수(J.S.Kim),서문석(M.S.Suh) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study a tracked vehicle is idealized as a 2-dimensional 9-degree-of-freedom model which takes into account the effects of HSU units, torsion bars, and track. For the model, equations of motion are derived u:;ing Kane' s equation. By using the equations of motion. a numerical example is solved and the results are compared to those obtained by using a general purpose multibody dynamic analysis program. The<br/> comparison study shows the reasonable coherence between the two results. which confirms the effectiveness<br/> of the model. With the model. dynamic response optimization is carried out by using IDOL I.6D program. The objective function is the peak value of the vertical acceleration of the vehicle at the driver seat. and the side constraints are the wheel travel limits, the ground clearance. and the limits of other design variables. Three sets of design variables are used to carry out the optimization. The results show the attenuation of the acceleration peak value. Thus the procedure presented in this study can be utilized for the design improvement of the real system.<br/>