If you have large residuals in ID, then it is unlikely that you will be able to achieve fully smooth controls by tracking the markers and GRFs tightly. Since you are enforcing the residuals to be small, the dynamic inconsistencies have to be made up somewhere. This is indeed a nice justification. I...

Hi Nick, thanks a lot for your response. The residual forces/moments in ID are huge (<380N, <50Nm). However, I don't want the simulated joints moments match the ID output. I just want actuators control to be smooth and natural (without spikes) given that the kinematics and GRF look good. I just foun...

Hi, I'm aiming to run a torque-driven marker + contact tracking simulation with weak [1N(m)] residual and strong [200N(m)] reserve actuators. The simulations converged successfully, and the markers and GRF were tracked well with the max abs residual actuation of 0.01 N(m). However, the actuators con...

Hi, I think this issue might be related to the coordinate system of your experimental data. Does your markers look standing upright when you preview them? If not, transforming your data before scaling could help: https://opensimconfluence.atlassian.net/wiki/spaces/OpenSim/pages/53089221/Previewing+M...

Hi, this likely occurs because of the hip range of motion; the curve's reached its lowest bound. You can fix it by increasing its range of motion or unclamping the coordinate to be any value outside the bounds: https://opensimconfluence.atlassian.net/wiki/spaces/OpenSim/pages/53089256/Coordinate+Con...

Hi, the build instructions might be helpful: https://github.com/opensim-org/opensim-core/wiki/Build-Instructions You can also create or modify the workflow for the GitHub Actions of your forked repository. This will automatically build your modified opensim-core and upload the Python bindings with m...

Hi, multi-segment foot kinetics is a controversial topic. Many researchers use inverse dynamics to calculate it similarly to any other joint, while a few believe this output could not be trusted. A force plate measures the force on the whole foot, and we don't know the force on each segment. So, it ...

Hi, regarding the question 2, I made a mistake; my bad. Those were the controls of the strong residual actuators which were less than 0.6 not their actuation force/moment. So, in a marker + GRF tracking simulation, using weak residual actuators or high weight for their control in the control-effort ...

Hi, if you share your model, markers, and setup files, I will test.

Hi Nick,
Understood, I appreciate your help.