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Inverse dynamics and Static Optimisation

Posted: Wed Oct 19, 2022 10:41 am
by vigneshrk
Hello,

I would like to understand how the output of Inverse dynamics is used by static optimisation? Based on the tutorials, I am not sure where the output of ID is fed? Or does static optimisation perform ID by itself?

Thanks
Vignesh

Re: Inverse dynamics and Static Optimisation

Posted: Thu Oct 20, 2022 3:07 pm
by ongcf
ID is not used as input to the Static Optimization tool. The tool itself does these calculations based on input kinematics and GRF data. In particular, it actually tries to match joint accelerations rather than joint moments (https://github.com/opensim-org/opensim- ... t.cpp#L603), but these should be equivalent problems.

Re: Inverse dynamics and Static Optimisation

Posted: Wed Oct 26, 2022 11:15 am
by vigneshrk
Thanks. So if I would like to calculate JRF, is there a particular reason the recommended process is :
IK-> ID->SO->JRF

Is there a benefit of performing the ID step