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나노 오일을 이용한 압축기 습동부 재질의 윤활 특성 향상에 관한 연구
김성춘(Sungchoon Kim),김경민(Kyongmin Kim),황유진(Yujin Hwang),박영도(Youngdo Park),이재근(Jaekeun Lee) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.10
Performance of refrigerant oil at the thrust-bearing and at the journal-bearing of a scroll compressor is a significant factor. This paper presents the friction and anti-wear characteristics of nano oil with a mixture of a refrigerant oil and carbon nano particles. The characteristics of friction and anti-wear using nano-oil is evaluated using the disk on disk tester for measuring friction surface temperature and the coefficient of friction. The average friction coefficient of nano-oil was reduced by 60% compared to raw oil under 600 N and 1,000 rpm. It is believed that the interaction of nano particles between surfaces can be improved the lubrication in the friction surfaces. Worn surfaces of frictional specimen were also investigated by the optical and atomic force microscopy. Conclusively, it is expected that wear and friction coefficient of compressor can be reduced by alignment applying nano-oil as refrigerant oil.
경량전철 교량 상부구조의 주행열차하중에 의한 진동 및 소음 분석
김성일(Kim Sungil),여인호(Yeo Inho),이인규(Rhee Inkyu),김성춘(Kim Sungchoon) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Running train is one of the most main factor for railway bridge vibration. The repeated forces with equidistant axles cause the magnification of dynamic responses which relates with maintenance of the track structure and structure-borne noises. The noise problem is one of the most important issues in services of light rail transit system which usually passes through towns. The noise of railway bridges can be divided into the noise from track-vehicle system and structure-borne noises. In the present study, The vibration and noise of the LRT bridge will be investigated with utilizing dynamics responses from moving train as input data for noise analysis.