Dear OpenSim community, I am using a multi-segement foot model for inverse dynamic analyses. I follow the standard OpenSim workflows of Scaling RRA and IK. When performing inverse dynamic analysis there are very high joint moments at the mid-tarsal joints (1-2 times body weight) even in the absence ...

Dear Nick, @passive force structures: yes, there are ligament forces. @are reserves used heavily? Yes, the muscles play a very small role in generating moments. But if I reduce max force of the reserves it would not converge. Any other suggestions? Would it make sense to reduce max reserve forces bu...

Dear Mikayla,

I did it within Moco. problem.addParameter()

Regards

Christian

Dear OpenSim Moco community, I am running an Optimization by initating MocoInverse and a MocoStudy for emg tracking. I use the DHondt_2023_model_with_3_segment_foot.osim model. The following modifications were done: at all DOFs except for the right ankle I appended strong coord actuators. I added re...

Dear Moco Community, I am running a MocoStudy with EMG tracking. The EMG tracking has by far the highest weight in my cost function (10). But when I investigate the solution, it seems that control effort has a larger weight in the overall cost function. This would match with the computed muscle acti...

Dear Nick and Ross, Thanks a lot for your feedback!! I tried to process your feedback and did the following: 1. Added coordinate actuators to the model and removed all muscles 2. Created an initial guess where the coordinates are good. 3. Re-run the analyses. Tried different weightings for GRF and C...

Dear community and Moco team, I wanted to follow up on the Contact tracking task. I made some progress but still do not get the desired outcome. Attached is a .png and below my code. The solution is not succeeding and restoration fails after 2000 or sometimes 5000 itertions. Wht I noticed is that wh...

Dear Moco community, I am trying to use a guess file from a previous MocoStudy solution but encounter the following problem/error message: RuntimeError: std::exception in 'void OpenSim::MocoCasADiSolver::setGuess(OpenSim::MocoTrajectory)': The trajectory and provided problem are not compatible. The ...

Thanks for the suggestions Ross, The GRF tracking weight was set to 10000 with the Coordinate and effort costs being set to 1 and the weight of the torso of the model is centerd at the pelvis. The total model weight corresponds with the subjects weight. Still the generated GRFs do not correspond to ...

Thanks Nick, I do add reserve actuators with the command: modelProcessor.append(osim.ModOpAddReserves(ReserveActuatorStrength)) The reserve actuator strength is set to 250. Should I add in addition coord actuators to the pelvis? I also changed the effort weight for the pelvis forces in this way: mod...