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Analysis of Various Parameters Associated with Oil Lubricated Journal Bearings. By: Paul Wolfinger. Background.
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Analysis of Various Parameters Associated with Oil Lubricated Journal Bearings By: Paul Wolfinger
Background • In marine bearing lubrication, the rotating shaft inside the bearing is in the presence of oil, which generates a wedge between the two due to the dynamics of the fluid. The fluid generally adheres to each body and must shear in order to accommodate the relative motion. • Fluid film thickness between the bearing surface and rotor provides lubrication, of which one can determine a velocity and temperature profile.
Project Purpose • This project evaluates full journal bearings, which completely surround the shaft journal to show relationships between diameter and RPM. • Four full journal bearing types are evaluated in COMSOL at four different conditions to trade-off bearing stability and capability to handle load: • Plain journal • Elliptical journal • Pressure dam journal • Offset/lobe journal
Validation of COMSOL • Reynolds equation with Sommerfeld solultion used to validate COMSOL • Petroff’s Equation to compare cases
Bearing Types • Plain • Elliptical • Pressure Dam • Offset/lobe
Summary of Case A and B Case A Case B
Summary of Case C and D Case C Case D