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정원식(W. S. Cheong),최승복(S. B. Choi),정재천(C. C. Cheong),김철수(C. S. Kim),이윤희(Y. H. Lee),한승직(S. J. Han) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
This paper presents performance investigation of a continuously variable ER(electro-rheological) damper operating with different ER fluids. A dynamic model of the damper is formulated by incorporating electric field-dependent Bingham properties of the ER fluids. The Bingham properties are experimentally obtained through an electro-viscometer. After analyzing damper performance through computer simulation, important model parameters of the ER damper are determined. The damping forces of the ER damper featuring two different ER fluids are experimentally evaluated by changing the intensity of the electric field. In addition, continuous controllability of the damping force is also demonstrated by implementing skyhook control algorithm.<br/> <br/>
문우식(W.S.Moon),류준욱(J.W.Ryoo),조연근(Y.G.Cho),정홍석(H.S.Chung),정범서(B.S.Cheong) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
Automotive fuel consumptions with different engine oils are determined according to the EPA FTP-75 method in this study. The results of fuel economy are discussed correlating with the properties of engine oils. To improve automotive fuel economy with engine oils, it is necessary to use VHVI base oils in formulating engine oil. The engine oils formulated with a VHVI base oil has better viscometric properties, resulting in better fuel economy. The temporary viscosity loss at 150℃ also affects automotive fuel economy.<br/>
Multiferroic h-HoMnO₃의 자기적 성질 연구
김성백(Sung Baek Kim),금복연(Bok Yeon Kum),김철성(Chul Sung Kim),안성용(Sung Yong An),N. Hur(N. Hur),S. Park(S. Park),S.-W. Cheong(S.-W. Cheong),장광현(Kwang-Hyun Jang),박제근(J.-G. Park) 한국자기학회 2005 韓國磁氣學會誌 Vol.15 No.2
Multiferroic HoMnO₃ single crystal was prepared using 4-point focused floating zone furnace, and polycrystalline HoMn_(1-x)(57)^Fe_xO₃ (x=0.00, 0.01, 0.02, 0.05) powders have been prepared by solid state reaction. Their magnetic and crystallographic properties are studied using MPMS, PPMS, and Mossbauer spectroscopy. The crystal structure is found to be a hexagonal and a magnetic easy-axis is (110) direction. As the external applied magnetic field increases, temperature of the dielectric constant anomaly is decreased. HoMn_(0.95)(57)^Fe_(0.05)O₃ shows huge quadrupole splitting value from the Mossbauer spectra.
정재민(J.M. Jung),최우연(W.Y. Choi),최승복(S.B. Choi),정재천(C.C. Cheong) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.6_1
This paper presents an active position control of a single-rod system featuring an electro rheological(ER) fluid based valve. The ER fluid to be employed to the proposed system is composed and its Bingham property is evaluated as a function of electric fields. Subsequently, a plate type of ER valve is designed on the basis of the field-dependent Bingham model and manufactured. Performance test of the ER valve is undertaken by evaluating pressure drop with respect to the number of electrodes as well as the intensity of electric fields. The ER valve cylinder system is then constructed and its governing equation of motion is derived. A neural control scheme for position control of the cylinder is established by incorporating with proportional-plus-derivative(PD) controller and consequently implemented. Experimental results of both regulating and tracking control responses are presented in order to demonstrate the effectiveness of the proposed methodology.<br/>