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김현모(H. M. Kim),류하오(Hao Liu),이재천(J. C. Lee) 유공압건설기계학회 2014 유공압건설기계학회 학술대회논문집 Vol.2014 No.9
In this paper, in the experiment environment of electrohydraulic non-linear valve servo systems, to design a controller using indirect model reference adaptive control(IMRAC). Designed controller performance was verified by experiment.
[論文] 유동과 열전달 특성을 고려한 수평 전자회로 기판의 설계조건에 관한 수치적 연구
전운학(U.H.Chun),이행남(H.N.Lee),김현모(H.M.Kim) 한국자동차공학회 1992 오토저널 Vol.14 No.2
Flow and heat transfer characteristics in a horizontal electronic circuit board are studied numerically. The board has the arrays of heated blocks and the spaces between the plates and blocks are changed.<br/> Air is used as cooling fluid, of which prandtl number is 0.7. The velocity distributions, temperature distributions, Nusselt numbers and dimensionless friction factors are obtained on the spaces between the plates and the blocks, for the cases of Rayleigh number, 0 and 1O^5. When Rayleigh number is so large, such as 10^5, that the effect of bouyancy is not negligible, fluid friction and heat transfer is increased more than those of forced convection. This may be caused by the generation of secondary flow on the cross section of primary flow. The effect of bouyancy is of the most efficient, when the space of blocks is about block-width and the space of plates is about 1.7 times of block-height.
손병길(B. G. Son),김현모(H. M. Kim),류하오(H. Liu),이재천(J. C. Lee),윤장원(J. W. Youn) 유공압건설기계학회 2013 유공압건설기계학회 학술대회논문집 Vol.2013 No.10
The vehicle dynamics modeling of a forklift is necessary to improve the shift quality of the transmission. This study presents the modeling of power transmission of a forklift from the engine to the wheels including torque converter, clutch and gear train, hydraulic control system and final drive differential axle using AMESim. Simulation results show that the modeling proposed in this study is useful to analyse and optimize the shift quality of the transmission for a forklift.