I've had an issue for quite some time now and struggle to explain why the joint reaction analysis tool gives me stupidly high values (>15 000N) with the dog model from Stark et al., 2021 (https://simtk.org/projects/dogmodel) through all joints of the left forelimb.
When muscles are included in the SO computation, resultant joint forces are crazily high, whereas when I disable all muscles and only use actuators, the JRFs seem coherent with the ground reaction force. See pictures below
Do you know what is happening here?
- WithMusclesAndActuators.png (70.12 KiB) Viewed 741 times
- OnlyActuators.png (63.73 KiB) Viewed 741 times
I tried one more thing without success but it gives hints to where the analysis may fail. First, I locked all degrees of freedom and iteratively unlocked them from the most distal to the most proximal. The JRF values seemed consistent with GRF until I unlock the dofs between the humerus and the scapula, where everything starts acting weird.
Any thoughts?
Thank you very much
Max Lavaill