Is there a block of code above all of this where OpenSim is installed, and if so, are there error messages from there? It looks like you might be using Google Colab. We noticed that they recently updated their Python version to 3.11 . This might clash with the OpenSim version install, if it was poin...

Are you able to reproduce this issue with OpenSim's example files? For instance, loading the gait2392 model, and then selecting Preview Experimental Data and seeing if the .trc files in that folder show up?

One other important check is that if OpenSim is in the system environment variables, you must make sure the one you want to use is above any other OpenSim installations. We found recently that it may even collide with Python OpenSim installs, so it was important to move the current OpenSim installat...

If the external load is extra mass, you could add a new body with the mass and inertial properties of the extra mass. If the external load is changing over time, you can use the gait examples to see how to apply an external load. In those examples, these are from measured ground reaction forces, but...

Static optimization uses a least-squares approach because there are more actuators than degrees of freedom (see https://opensimconfluence.atlassian.net/wiki/spaces/OpenSim/pages/53089619/How+Static+Optimization+Works). The equations there don't quite capture what the reserve actuators are contributi...

The citations from that GitHub page include a reference for Seth et al. and the Scapulothoracic joint, and the ScapulothoracicJoint was added in OpenSim 4.2 (https://opensimconfluence.atlassian.net ... penSim+4.2).

Please refer to the discussion in this previous post: viewtopicPhpbb.php?f=2385&t=17594&p=49369&start=0&view=

In particular, the link to the OpenCap GitHub folder for OpenSimAD has great information in the README file.

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Please see the example Simulation-Based Design to Reduce Metabolic Cost for an example.

It looks like the maximum force/moment that your reserve actuators can produce might be very small. The total force/moment is determined by (control value) * (reserve actuator force value). So, these actuators are generating 1 N or 1 N-m (depending on if it's a linear coordinate or a rotational coor...