SO and JRA output discrepancies (OpenSim v33 vs v41)
Posted: Wed Feb 24, 2021 8:31 am
Dear all,
While updating some MATLAB codes (from v3.3 to v4.1) to run the classic simulation pipeline (i.e., IK, ID, SO and JRA) and checking for results consistency (between sw versions), we observed some non-negligible differences in the JRA output (~10% in correspondence of the second characteristic peak. See picture below). On the other hand, IK and ID results were almost identical between software versions.
Could this be uniquely attributed to the minimum muscle activation that in v4.1 is forced to be no less than 0.01 (while earlier could be 0)? Or else?
Note that all input files (c3d, trc and mot files) were the same. Both model and mot files were converted following the instructions and methods suggested here and/or previous forum posts.
Any help or insight would be greatly appreciated.
Cheers,
Giorgio
PS: Some additional pictures from SO analysis...
While updating some MATLAB codes (from v3.3 to v4.1) to run the classic simulation pipeline (i.e., IK, ID, SO and JRA) and checking for results consistency (between sw versions), we observed some non-negligible differences in the JRA output (~10% in correspondence of the second characteristic peak. See picture below). On the other hand, IK and ID results were almost identical between software versions.
- Knee Joint Reaction force
- JRA.png (26.32 KiB) Viewed 122 times
Could this be uniquely attributed to the minimum muscle activation that in v4.1 is forced to be no less than 0.01 (while earlier could be 0)? Or else?
Note that all input files (c3d, trc and mot files) were the same. Both model and mot files were converted following the instructions and methods suggested here and/or previous forum posts.
Any help or insight would be greatly appreciated.
Cheers,
Giorgio
PS: Some additional pictures from SO analysis...
- Vastus Lateralis activation
- vasLat.png (16.67 KiB) Viewed 122 times
- Vastus Lateralis force
- vasLat_force.png (18.1 KiB) Viewed 122 times
- Tensor Fasciae Latae force
- tfl.png (22.43 KiB) Viewed 122 times