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최영태(Y. T. Choi),김기선(K. S. Kim),최승복(S. B. Choi),정재천(C. C. Cheong),전영식(Y. S. Jeon) 한국자동차공학회 1994 한국 자동차공학회논문집 Vol.2 No.3
This paper addresses on the model synthesis and perfonnance analysis of an engine mount featuring electro-rheological(ER) fluids which undergo a phase change when subjected to electric fields. A novel type of ER fluid-filled engine mount is devised and its hydraulic model is constructed. An equivalent mechanical model is subsequently obtained from the governing equation of the hydraulic model. The model parameters associated with the ER fluids are distilled from experimental investigations on the Bingham properties of the fluids. The distilled data are then incorporated into the governing model to undertake feasible work through computer simulations. It is shown that the proposed engine mount has an inherent capability of controlling both the damping force and the resonance frequency. Other superior performance characteristics accrued from the proposed methodology are also evaluated.<br/>
김희준(H.J.Kim),최영태(Y.T.Choi),최승복(S.B.Choi),정재천(C.C.Cheong) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
This paper presents performance analysis of an ER (electro-rheological) engine mount. A shear-mode type ER engine mount is devised and its equation of motion is derived from a bond graph method. Subsequently, a full-car model which is installed with ER engine mounts is established, followed by the construction of the governing equations of motion. Field-dependent vibration isolations of the full-car system are analyzed by considering excitation forces of the engine.<br/>
박인환(I.H.Park),최영태(Y.T.Choi),전영식(Y.S.Jeon),최승복(S.B.Choi),정재천(C.C.Cheong) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_1
This paper presents the performance investigation of an engine mount featuring an ER (Electro-Rheological) fluid. The Bingham properties of the ER fluid to be employed to the ER engine mount are experimentally obtained through Couette type viscometer. The governing equation of motion of the ER engine mount is derived using equivalent hydraulic model. The ER engine mount is then designed and manufactured on the basis of parameter studies. The electric field-dependent transmissibility of the ER engine mount is evaluated by changing the particle concentration of the ER fluid.<br/>
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),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/>