Page 69 - Tribology in Machine Design
P. 69

56   Tribology in machine design


                                 equilibrium, are the basis of the theory of fluid-film lubrication or
                                 hydrodynamic lubrication.




                                 abbreviated form as follows: using the method of substitution, integrate eqn
                                 (2.136) in terms of a new variable </> such that




                                where












                                 hence





                                This equation can readily be integrated in terms of 4>. Further, since the
                                pressure equation must give the same value of p when 0 =0 or 0 =2n, i.e.
                                when 0=0 or 4> — 2n, the sum of the terms involving (f) must vanish. This
                                condition determines the angle 0' and leads to the result





                                The integral then becomes




                                Substituting for sin cf) and cos (f) in terms of 0, the solution becomes
   64   65   66   67   68   69   70   71   72   73   74