Hi all, I have a question regarding to the numerical adjustment of the forceplate data to estimate the first double phase when there is only two force plates. I have done a study using Opensim CMC+IAA pipeline to estimate muscle compensatary activation to the co-contraction. However, we only have tw...

Hi Ayman, Thank you for the quick reply. I am still not so sure about how to assign locations of the two points. In the foot-ground contact, the contact point is moving along the COP path. How should I implement this? I have tried using [0,0,0], it seems work. But not sure why? [0,0,0] should be the...

Hi, I am tring other PointConstraint in IAA tool, but there are some erros loading setup file. Exception: Invalid point constraint body1 (Unassigned) specified in Constraint right_foot_contact I suspected there are something different than RollingOnSurfaceConstraint to specify contact body, which is...

Hi,

I just want to confirm is the muscle induced angular accelerations from IAA tool in degree/s^2 or in rad/s^2? It is a little confused in the heading in the output sto file, which states 'inDegrees=no,Angles are in degrees'.

Thank you,

Ruoli

Hi Rudi,

Thank you for the quick reply.

About states file, will FD give different joint angles than the input .sto? Is it enough just giving states values at the inital time and let it compute forward a short interval?

Thank you,

Ruoli

Hi all, I have a question about forward dynamics. I want to investigate how joint angles may change when the ankle plantarflexor/dorsiflexor co-contraction is higher than normals in gait. Can forward dynamics do the job? e.g. with pre-defined controls and GRF force data, can FD predict the new kinem...

Hi Ayman, Thanks again for helping me to write predefined control constraints. I have tried to run CMC, but it seems to me that the CMC did not follow the pre-defined constraint nodes. I expected that the computed muscle control (from the results control file) which I predefined and the values I add...

Hi Ayman,

What you suggested works!

Thank you,

Ruoli

Hi Ayman,

I have uploaded a short .sto file as an attachment (changed to .txt for uploading). I can not either save it in an existing control constraints file or the software just crashed.

I tried to edit in excitation editor, but it is kind of taking time to edit each point.

Hi Ayman, Thank you for your reply. I have tried excitation editor, but I can not really save it, always got runtime error with java.exe. I saved the predefined controls (e.g. gasmed_r) in a .sto file , then loaded control of gasmed_r from a regular cmc_constraint.xml. When I right click the grid pa...