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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.
김원현(Won-Hyun Kim),이수목(Soo-Mok Lee),배종국(Jong-Gug Bae),김도중(Do-Joong Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A valve train dynamics of newly developed medium speed diesel engine was measured and analyzed. OHV-type valve train is represented by 7-DOF lumped mass model and distributed parameter model for the dynamic simulation. Analysis results with the given cam profiles were compared with the measured valve displacements, accelerations and acting forces. Based on these results, dynamic characteristics of valve train were investigated and the performance and safety were also evaluated. To improve the analysis accuracy, contributions of design parameters(mass and stiffness) to the dynamic behavior were investigated with the natural vibration analysis and sensitivity analysis. In addition, model tuning and optimization were performed from the measurement results.