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자동변속기 주축의 회전에 따른 변속기유 분출량 측정 연구
장시열(Siyoul Jang),이덕재(Duckjae Lee),박준수(Junsu Park),김학수(Haksu Kim),이정선(Jeongseon Lee) 한국트라이볼로지학회 2007 한국트라이볼로지학회 학술대회 Vol.2007 No.6
The durability and efficiency of an automatic transmission are greatly affected by the lubrication properties of transmission fluid. However, it is difficult to exactly estimate the flow rate of lubricating oil at each part of automatic transmission because of its structural complexity under the rotating condition. This study is performed on oil flow distribution measures though each oil hole inside the main shaft supplying ATF for system parts. Oil enters a horizontal tube through entry and discharges into open air via radially-attached branches. Oil flow, pressure and rotational speed are varied. Changes in flow rate with rotational speed are obtained. This study is believed to be the start for the optimal design of the lubricating system in the automatic transmission.
장시열(Siyoul Jang),박경근(Kyoung Kuhn Park),김완두(Wandoo Kim) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-
Ball reducer with waved grooves has many advantages over other reducers for the high-reduction ratios, low noise and low energy loss, etc. The mechanism of force transmission is very similar to that of cam and follower in automobile valve train system especially in the contact geometry. In this study, we have investigated the traces of contact between ball and outer race and the working behaviors with a certain reduction ratio. In order to verify the contact behaviors between ball and outer race, which determines the critical endurance life the contact velocity and load are computed for a cycle. During some period of a cycle, the contact velocity reverses its direction very suddenly, which causes undesirable endurance performance of this machinery. From the computational investigation in this work, we hope to predict similar contact damages in other machinery due to this kind of contact behaviors, which is very common in many contact phenomena.
고온 고전단 변형률 속도 조건에서 멀티그레이드 윤활유의 유막두께 형성 측정 연구
장시열(Siyoul Jang),김재홍(Jaehong Kim),배대윤(D. Y. Bae),유성춘(S. C. Yoo),이병옥(B. Rhee) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.11
It is important to decide the minimum film thickness and viscosity of a multigrade lubricant in a contact surface between engine composition articles. By carrying out acceleration, deceleration, and sliding-rolling ratio movement, it is experimented that film formation variations in the contact surface are measured. In order to exactly investigate the variations of a multigrade lubricant film thicknesses. optical interference images are continuously taken by high resolution CCD camera, the friction torques in a contact surface measured simultaneously as well.
롤러 축방향 프로파일의 형태에 따른 캠-롤러 종동물 접촉 유막 압력 해석 연구
장시열(Siyoul Jang),김완두(Wandoo Kim),김민철(Minchul Kim) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.11
Roller contacts with the consideration of finite axial length are studied with the respect of elastohydrodynamic lubrication. The profile of the axial direction in rollers is the main design factor in order to increase fatigue life due to the stress concentration along the edge of the roller. Even under the ehl lubrication conditions, the stress concentration along the edge of the roller greatly influences the fatigue life both for the roller and contacting bodies. In this work, several profiles are investigated to verify how the ehl film and pressure are generated and which profile is recommendable for the ehl contact condition.
비정상 상태의 선접촉 탄성유체윤활 유막두께 및 유막압력 특성연구
장시열(Siyoul Jang),조재철(Jae Cheol Cho) 한국트라이볼로지학회 2009 한국윤활학회지(윤활학회지) Vol.25 No.5
Elastohydrodynamic lubrication (EHL) analysis shows that film thickness is very flat in the contact area and pressure distribution is somehow similar to that of Hertz ian contact pressure except the outlet region with pressure spike. These typical patterns of EHL film thickness and pressure are the cases under the steady contact conditions of applied loads and speeds. However, many engineering contacts are rather under the conditions of varying loads and contact speeds, and therefore the predictions for endurance life and performance of machine elements with steady EHL analysis are not suitable in many occasions. This study shows the differences in film thickness formation and pressure distribution between steady and transient contact conditions in several contact cases.
장시열(Siyoul Jang) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Investigation of mass effect on the journal traces in the bearing clearance has been performed for better mass distribution of crank system components with the respects of lubrication on the big-end bearing. In this preliminary study, crank pin traces in the clearance of engine bearing are studies by varying the sizes of pin mass, while most previous studies regarding journal locus with dynamic loading system neglected the inertia effect of crank pin mass. Although the inertia effect of pin mass is negligible small compared to viscous force in ?? bearing, it gives a great amount of influences on the journal traces in full bearing computation.
장시열(Siyoul Jang),임홍재(Hong Jae Yim),강윤석(Yun Seok Kang) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.6
Surface contacts between mold and target should be in parallel for the imprinting mechanism. However, the size of contacting area makes it difficult for both mating surfaces to be in all contact because of precision level of the imprinting machine and the waviness of mold and target. The gripping force for both mold and target with the vacuum chuck is also major effect to interrupt the full contact, which must be avoided in imprinting mechanism. In this study, the preliminary study for the causes of non-uniformity of contacting surfaces such as mold and target is performed with 470 × 370㎟ LCD panel size.