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Analysis of Various Parameters Associated with Oil Lubricated Journal Bearings

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

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  1. Analysis of Various Parameters Associated with Oil Lubricated Journal Bearings By: Paul Wolfinger

  2. 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.

  3. 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

  4. Validation of COMSOL • Reynolds equation with Sommerfeld solultion used to validate COMSOL • Petroff’s Equation to compare cases

  5. Validation of COMSOL

  6. Bearing Types • Plain • Elliptical • Pressure Dam • Offset/lobe

  7. Conditions for Evaluation of Each Bearing in COMSOL

  8. Plain Journal Bearing Results

  9. Elliptical Bearing Results

  10. Pressure Dam Bearing Results

  11. Offset/Lobe Bearing Results

  12. Summary of Case A and B Case A Case B

  13. Summary of Case C and D Case C Case D

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