Hello,
I want to know how OpenSim applies the ground reaction forces for doing its inverse dynamics. For example in the following box, .
It is shown that force is applied to body 'calcn_r', and the point and force magnitude is expressed in the ground reference frame. So, is it point-to-point force, acting between points 'ground_force_px', '...py' and '...pz' and calcn_r (origin of its local coordinate frame)? Or Point Columns is an extra data which may not be used? Please explain how this force is being applied.
Thanks,
Ratna
Understanding applying Ground Reaction Force to a model
- Ratna Sambhav
- Posts: 42
- Joined: Sat Jan 12, 2019 10:16 am
- Thomas Uchida
- Posts: 1790
- Joined: Wed May 16, 2012 11:40 am
Re: Understanding applying Ground Reaction Force to a model
The force vector [ground_force_vx, ...] and coordinates of the point of application [ground_force_px, ...] are both expressed with respect to the ground reference frame. Please also see "How to Use the Inverse Dynamics Tool" (specifically, the "External Loads Specification" section) in the documentation: https://simtk-confluence.stanford.edu/d ... cification.