How to pass the whole body mass

[Mritula Chandrasekaran]

Hi,
I am trying to apply Mocotrack and track the subject gait and later predict it with changed mass. How can I pass the overall mass value range like passing overall tracking weight

track.set_states_global_tracking_weight(10);

Thanks,
Mritula

[Aaron Fox]

Hi Mritula,

This sounds like a problem you'd deal with outside of Moco. You would change the mass of your model external to the MocoTrack object (e.g. via scaling to a different mass, or manually changing the mass and inertial properties of bodies in the model) - and then simply pass the different models through the MocoTrack object on different simulation iterations. Make sense?

Aaron

[Mritula Chandrasekaran]

Hi Aaron,
Thanks for your reply. Yes I know to do it via scaling. Was just curious if it could be done via moco. Will stick on to do it via scaling.

Thanks,
Mritula

[Aaron Fox]

Sounds like you've got it under control

It makes sense to do simple changes in mass as part of scaling, given mass is a component of the model. You would probably only incorporate this in Moco if you were trying to optimise mass as a parameter for a given scenario (e.g. optimal mass distribution in the bodies to minimise residual actuation on the pelvis - similar to RRA?). The sliding mass example with Moco is a pretty simple example of a mass optimisation problem I suppose.

Good luck with your study.

Aaron

[Mritula Chandrasekaran]

Thanks, Aaron, will definitely check it up.

Mritula