rpm input for spinning body module

[AviKarthik]

Hello Professor @schaubh,

What can I use to be able to play with the the rpm of my spinning body? Is there some variable that I can set at the start of the sim or some other method? I want to be able to input the rpm that I want the spinning body to rotate at for the duration of the simulation.

Sincerely,
Avinash

[schaubh]

You set the initial states of the 1-DOF spinner to have a non-zero thetaDotInit rate? See http://hanspeterschaub.info/basilisk/Documentation/simulation/dynamics/spinningBodies/spinningBodiesOneDOF/spinningBodyOneDOFStateEffector.html

[AviKarthik]

I tried this but what happens for me is that it has a spike at the beginning and then the speed drops off, is this supposed to happen?

[schaubh]

Momentum can transfer from the spinning body to the hub. Depends on if you are setting up an equilibrium spin condition, or if you have friction modeled in the spinning body.