Reply To: Boundary Condition -Ball Bearing

[dlooman]

The boundary condition is just a small theta displacement of the inner race.  A difficulty may be that the races are not applying any compression to the ball.  As you mention you have hertzian contact between the ball and the race.  Resolving that require perfect geometry and an infinitessimal amount of geometric overlap.  Step 1 should be a static analysis of the hertzian contact.  If that looks good then try to rotate the inner race a small amount.  That could be a static analysis as well.  The dynamic effects in such an analysis are secondary.