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크랭크 강성을 고려한 다기통 디젤엔진 메인 베어링의 윤활해석
임도형(Do-Hyeong Lim),이수목(Soo-Mok Lee),김종석(Jong-Suk Kim) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.11
Coupled lubrication analysis for main bearings of multi-cylindered Diesel engine was performed considering both the bearing oil film stiffness and structural stiffness of crankshaft. To develop an integrated lubrication analysis program. FE formulation of the ordinary bearing lubrication problem was established and 6-degree of freedom stillness from crankshaft FE model was extracted to be coupled in simultaneous lubrication analysis including nonlinear oil film characteristics and deformation of crankshaft. The program was tested and verified through a 8-cylinder medium speed diesel engine (Himsen engine) and the result was compared with simple single bearing analysis. Consideration of engine crankshaft flexibility gave much realistic result compared to the simple one and also gave significant information about the behavior of the local bearing.
유재형(Jae-hyeong Yoo),임도형(Do-hyeong Lim),이수목(Soo-mok Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The impeller in a turbocharger is a key component and is subject to the various loads as well as centrifugal force over 10,000rpm. The high structural reliability and stability are required to the impeller which is assembled with a rotor shaft, bearings and thrust collar. In this paper, the structural assessment of the impeller which is made of the aluminium alloy was presented. In order to confirm it, structural and dynamic evaluation using FE analyses were performed. In FE analyses, centrifugal force, thermal load, working pressure and mechanical contact between neighboring components were taken into account. Structural contribution for each loading was compar ed. Additionally, the characteristics of deformation and vibration under each loadingwere also investigated.
오일링 저널 베어링에서의 오일이송 메커니즘에 관한 연구
이수목(Soo-Mok Lee),임도형(Do-Hyeong Lim) 한국트라이볼로지학회 2006 한국트라이볼로지학회 학술대회 Vol.2006 No.11
The oil ring journal bearing is one of the simplest lubrication systems. Because of its simplicity in oil feed and transport mechanism. it has been widely used in the industrial machinery especially in electrical rotating machinery. However not much research works are reported or published yet about the analytic model of the bearing except some experimental test results which can be readily used in the design and manufacture. In this study oil transport mechanism of oil ring driven bearing is analyzed. simulated and tested. Main efforts of the analyses are focused on the behavior of the oil ring including equation of motion, hydrodynamic interaction with the oil fluid in the reservoir lank. oil transport through the ring surface in the air region. and driving friction force by the rotating shaft. The oil behaviors in the tank and in the air are analyzed by basic fluid mechanics and the frictional model between the ring and shaft are based on the 2D Reynolds lubrication model. Shaft speed, oil ring and shaft diameters, oil viscosity and free surface level of the oil in the tank are main input variables and oil ring speed and transport oil quantity are the main outputs of the simulation. The analytic results are compared with experimental results and they were found fairly coincident supporting the validity of the analytic model.