Friction in the Full Journal Bearing

To calculate the friction in a full journal bearing we have recourse to Eqn 2-26, using the fact that at the surface of the journal the velocity is U and 1 = 0. The tangential stress at the journal surface is then 

The load carried by the bearing is obtained by integrating the pressure over its surface and setting the result equal to the force acting perpendicularly to the line 00 joining the centers  

However, the assumption which gave us Eqn 2-47 is physically unrealistic. A more rigorous approach, details of which can be found in the monograph by Pinkus and Sternlicht, enables the computation of the attitude angle g. Numerical methods are used for the most part. Once a value has been obtained for g the value of e is easily calculated. It is customary to insert the value of e thus found into Eqn 2-51 to calculate the Sommerfeld number, although, as Pinkus and Sternlicht show, a more realistic relation is 

By plotting the quantity X(a/c) against S as calculated by the right-hand side of Eqn 2-52 the influence of various operating parameters found on the left-hand side of Eqn 2-52 can be evaluated by hydrodynamic theory. Curve A in Fig. 2-8 is a typical example of such a plot. But it 

Although the mixture of units in the factor (ZNl/P is not logical, the course of the curves in Fig. 2-9 resembles Curve B in Fig. 2-8. The 

---