Unclear behaviour of Mechanics.Rotational.Components.LossyGear

[AHaumer]

Can anybody tell me whether I'm using the LossyGear in a wrong way, or this is a bug in LossyGear? I want to model a gear with constant efficiency eta. For eta=1 I get the expected result. For eta=0.85 the torque from both sides (drive and load) seem to get absorbed by the LossyGear, the mass won't move. Hubtisch.zip .

[tobolar]

It seems the losses of the gear are higher then the applied torque, so that the gear stucks. Compare the variable lossyGear.mode for the two cases in simulated time. For eta=1, the mode=2, i.e. the gear is "free" (for whatever it means); in contrast, for eta=0.85, the mode=0, i.e. it stucks.

If you set eta=0.99, you can observe nice change of both lossyGear.w_a and lossyGear.mode.

[AHaumer]

Thanks @tobolar for your answer. To me this behaviour is problematic: The fact that the gear can get stuck I'd describe with tau_bf (which I set to 0) not with eta_bf. If I loose 15% (efficiency 85%) of the applied torque (or is it calculated from power?), it can't get stuck. At least the documentation should be improved ...

[tobolar]

The documentation says:

Note, that the losses are modeled in a physically meaningful way taking into account that at zero speed the movement may be locked due to the friction in the gear teeth and/or in the bearings.

@AHaumer Please feel free to make a suggestion how to improve this.