.Modelica.Mechanics.Rotational.Examples.LossyGearDemo2

Information

This model contains bearing friction and gear friction (= efficiency). If both friction models are stuck, there is no unique solution. Still a reliable Modelica simulator should be able to handle this situation.

Simulate for about 0.5 seconds. The friction elements are in all modes (forward and backward rolling, as well as stuck).

You may plot:

Inertia1.w,
Inertia2.w          : angular velocities of inertias
powerLoss           : power lost in the gear
bearingFriction.mode:  1 = forward rolling
                       0 = stuck (w=0)
                      -1 = backward rolling
gear.mode           :  1 = forward rolling
                       0 = stuck (w=0)
                      -1 = backward rolling

Note, powerLoss (= sum of the power flows of the connectors) and gear.powerLoss (= gear.tau_loss*gear.w_a, where gear.tau_loss is determined in a non-trivial way from the stuck/sliding situation of the bearing and teeth friction; = equation (16) in [Pelchen2002]) should be identical, or the difference should be close to zero, if model LossyGear is correctly implemented.

Note: This combination of LossyGear and BearingFriction is not recommended to use, as component LossyGear includes the functionality of component BearingFriction (only peak not supported).