Dear all, a student of mine has started working off the example2DWalking tutorial to perform some simulations with Moco Predict on data from the 6th edition of the Knee Grand Challenge. However, he incurred in the infeasible Problem error, which we seem unable to solve. Below I will provide some con...

Thanks as always Carmichael!

That's a pity, though.
Are you aware of any ways to detect mesh-to-mesh collisions in OpenSim?

Cheers,
Giorgio

Hi all, I have been trying to use contact meshes in lower limb models to estimate bone-to-bone and bone-to-ground contact. Specifically, as I have access to medical imaging data, I am implementing ElasticFoundationForces (as shown in the AddCustomFeet example). While I have no problems in getting wh...

Thanks Ayman for the prompt reply. I have gathered some more information from my students, which you can find below and attached: macOS: BigSur v11.3 (student #1), v11.3.1 (student #2), v11.2.3 (student #3) opensim-cmd installation: succesfull in one case (see picture 1_successful_install), unsucces...

Dear all, while trying to use the dos command to run the AnalyzeTool from the terminal (to batch process StaticOptimization and JointReaction analyses using the OpenSim API in MATLAB), some students of mine who work on MacOS were shown the following message and could not successfully run the simulat...

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 characteris...

We will try both approaches and see what works best for us.

Thanks again for your help and suggestions.

Giorgio

Thanks Carmichael! If I got it right, you are suggesting not to introduce a weld joint and a weld constraint to model the cuff, but rather to apply the measured torque directly to the knee joint using a CoordinateActuator. We will give it a go. What if we want to use FD simulations to validate our p...

Dear all, I would like to simulate a maximum voluntary isometric contraction, i.e. subject sitting on a dynamometer trying to extend one leg, but I am not sure what the best approach is. Considering that I won't have experimental motion capture data, I think the viable options are (please correct me...