@Ollie has updated his Tensile Rotary Power Transmission model
It works a lot faster than any of mine.
He says…
Finally managed to get material damping in there.
Axial force applied from start, after 2 seconds torque applied at the top, after another 2 seconds torque applied at the bottom. This is what happens if you slam the breaking current on.
Next step, add in aerodynamic damping…
And he sees a lot of scope to further improve the model.