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

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Presentation on theme: "Analysis of Various Parameters Associated with Oil Lubricated Journal Bearings By: Paul Wolfinger."— Presentation transcript:

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 Case ABCD Bearing Radius (m) 0.25 0.50 Rotor Radius (m) 0.24 0.48 Rotational Speed (rad/sec) 104.7 209.4 Offset in X-dir (m) 00.003 Offset in Y-dir (m) 00.003 Eccentricity (m) 00.00424 Radial Clearance (m) 0.01 0.02 Eccentricity Ratio 0.0000.4240.212

8 Plain Journal Bearing Results Case ABCD Bearing Radius (m) 0.25 0.50 Rotor Radius (m) 0.24 0.48 Rotational Speed (rad/sec) 104.7 209.4 Max Pressure (kPa) 4.36104.98190.74701.24 Min Pressure (kPa) -5.49-130.96-209.30-795.62 Max Temperature (K) 305.64306.69305.29305.51

9 Elliptical Bearing Results Case ABCD Bearing Radius (m) 0.25 0.50 Rotor Radius (m) 0.24 0.48 Rotational Speed (rad/sec) 104.7 209.4 Max Pressure (kPa) 36.73106.13245.791217 Min Pressure (kPa) -56.8-154.5-376-1651 Max Temperature (K) 305.59305.73305.24305.3

10 Pressure Dam Bearing Results Case ABCD Bearing Radius (m) 0.25 0.50 Rotor Radius (m) 0.24 0.48 Rotational Speed (rad/sec) 104.7 209.4 Max Pressure (kPa) 48.8108249763 Min Pressure (kPa) -22.4-114-224-788 Max Temperature (K) 305.57306.98305.29305.66

11 Offset/Lobe Bearing Results Case ABCD Bearing Radius (m) 0.25 0.50 Rotor Radius (m) 0.24 0.48 Rotational Speed (rad/sec) 104.7 209.4 Max Pressure (kPa) 40.866.2160576 Min Pressure (kPa) -30.9-90-198-728 Max Temperature (K) 305.73306.10305.33305.59

12 Summary of Case A and B Bearing PlainElliptical Pressure Dam Offset/Lobe Max Pressure (kPa) 4.3636.7348.7640.82 Min Pressure (kPa) -5.49-56.77-22.39-30.94 Max Temperature (K) 305.64305.59305.57305.73 Bearing PlainElliptical Pressure Dam Offset/Lobe Max Pressure (kPa)104.98106.13107.9266.24 Min Pressure (kPa)-130.96-154.52-114.06-89.62 Max Temperature (K)306.69305.73306.98306.10 Case A Case B

13 Summary of Case C and D Bearing PlainElliptical Pressure Dam Offset/Lobe Max Pressure (kPa) 190.74245.79249.13159.57 Min Pressure (kPa) -209.30-376.15-224.20-197.65 Max Temperature (K) 305.29305.24305.29305.33 Case C Bearing PlainElliptical Pressure Dam Offset/Lobe Max Pressure (kPa)701.241,217.2763.42575.86 Min Pressure (kPa)-795.62-1,651.7-788.30-727.71 Max Temperature (K)305.51305.30305.66305.59 Case D


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