The lift-off force for double row bearings is not directly available as result in the MESYS Rolling Bearing Calculation. But the lift-off force can easily be determined using the parameter variation. The lift-off force is defined as the external axial force where one row of the double row bearing is unloaded.
If the double row bearing is defined using two single row bearings and the bearing configuration, the axial forces per row can be shown over the external axial force:
In addition to the axial forces in blue and red also the minimum contact stress is shown in green. Using the minmal contact stress the lift-off force is more easily to detect as it has a larger gradient than the axial force of the second row..
In case a double row bearing is used as bearing type, the axial force per row is currently not available as result. The lift-off force can still be determined using the minimum contact stress as above:
In addition to the minimum contact stress in blue also the axial stiffness is shown in red. The axial stiffness has a small edge at the lift-off force as one row is loosing its load. Especially for high speed all rolling elements should be loaded to avoid slippage. This can be checked easily using the minimal contact stress.