Page 366 - Subyek Teknik Mesin - Forsthoffers Best Practice Handbook for Rotating Machinery by William E Forsthoffer

Gas Turbine Best Practices Be st Practice 6.5

Fig 6.5.5 Tilting pad journal bearing assembly (Courtesy of
Fig 6.5.4 Prevention of rotor instabilities
Kingsbury, Inc.)

Fig 6.5.6 Typical journal bearing selection curve (Courtesy of Kingsbury, Inc.)

As an exercise calculate the following for this bearing:
Figure 6.5.6 shows the mechanical frictional losses and oil
flow requirements for a tilt pad journal bearing as a function of - Projected Area
shaft speed. A PROJECTED ¼ 5" 2"
Note that the basis for horsepower loss and oil flow is an ¼ 10 square inches
oil temperature rise of 30 F. This is the normal design 6T - Pressure

for all hydrodynamic bearings. Also given in this figure is the ¼ 3479 lb force O 10 square inches
data necessary to calculate bearing pressure at the load point. ¼ 347.9 psi on the oil film at load point

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