Forward Dynamics with SCONE Results (STO)

Provide easy-to-use, extensible software for modeling, simulating, controlling, and analyzing the neuromusculoskeletal system.
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Eric Hu
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Joined: Tue Oct 03, 2023 1:56 pm

Forward Dynamics with SCONE Results (STO)

Post by Eric Hu » Wed Mar 05, 2025 2:41 pm

Hi everyone,

I wanted to input the results from SCONE into the Forward Dynamics tool in Opensim, but I was not able to replicate the motion from SCONE in OpenSim. I separated the big STO file from SCONE to a control file with 0.01 time steps of muscle excitations and Coordinate Actuator controls and a states file with 0.01 time steps of q's, u',s muscle activations, and muscle fiber length. To preface, I used the Analysis tool to check if these files are correctly formatted, and that tool produces the same motion, GRFs, and forces as the SCONE results. Now when I add the same files to Forward Dynamics, the model is not able to replicate that motion. I was wondering if there is something wrong with the Coordinate Actuator values or just how I input the data. The coordinate actuator has a control of -inf to inf and a optimal force of 1. The control of that actuator may have a magnitude greater than 1 and have negative values. If it is this or perhaps something else, then any advice is greatly appreciated.

Thank you,
Eric

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