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김연수(Kim Y.S.),목재균(Mok J.K.),장세기(Chang S.K.),홍용기(Hong Y.K),김용기(Kim Y.K.),김진완(Kim J.W.),김태형(Kim T.H.) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
A bi-modal tram has been developing to consist of articulated-two cars propelled by CNG hybrid (series type) in Korea since 2003. All wheels are driven by electrical motors independently, which can eliminate differential gears to reduce turning radius and make low floor to provide the old and the handicapped with easy access. In the bi-modal tram, therefore, reduction gear unit is key technology to make low floor and drive wheels independently. This study was aimed at performance evaluations of the reduction gear unit for the bi-modal tram. Oil leakage, oil temperature, vibration, acoustic noise in idle operations were measured for the reduction gear unit of the bimodal tram.
손상된 선박의 구난 기술 및 안전 예항에 관한 연구(4)
손경호(K.H. Sohn),이상갑(S.G. Lee),최경식(K.S. Choi),김용기(Y.K. Kim) 한국항해항만학회 1998 한국항해항만학회 학술대회논문집 Vol.2 No.2
This paper presents a brief outline of dynamic stability of damaged ship in rough, beam wind and waves. The one degree-of-freedom, linear roll equation is adopted with the effects of damage fluid and external forces, but without the effect of sloshing. We evaluate the dynamic stability in terms of capsizing probability based on energy balance mechanics and risk analysis, the method of which was proposed by Umeda [2] to the high speed crafts. As a result, we can predict the dynamic stability quantitatively according to sea state, operating and damage conditions.
김수태(S. T. Kim),최대봉(D. B. Choi),정동수(D. S. Jeong),김용기(Y. K. Kim) 한국생산제조학회 2005 한국공작기계학회 추계학술대회논문집 Vol.2005 No.-
Use of the high speed and frequency motor spindles are increasing for the high speed machine tools recently. The important problem in the high speed spindles is to reduce and minimize the thermal effect by motor and ball bearing. Thermal characteristics according to the bearing preload and the oil jacket cooling are studied for the spindle with oil mist lubrication and high frequency motor. Temperature distribution and thermal displacement of the spindle system with high speed and frequency motor for engraving machine are measured according to the spindle speed, the preload and the flow rate. Temperature distribution and thermal displacement of the high speed spindle system can be estimated by using the three dimensional model and numerical method. This results show that the suitable preload and oil jacket cooling are very effective to minimize the thermal effect by motor and ball bearing.