Inverse Dynamics with and without Muscles

Provide easy-to-use, extensible software for modeling, simulating, controlling, and analyzing the neuromusculoskeletal system.
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Colin Rubow
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Joined: Mon Dec 19, 2022 11:27 am

Inverse Dynamics with and without Muscles

Post by Colin Rubow » Tue Jan 03, 2023 4:53 pm

Hello,
In performing inverse dynamics I have two cases. The first is where muscles are enabled and the second is otherwise. The goal is from the HYOID neck model to plot the moments experienced by the joints during a flexion motion, however, I've found that having muscles enabled or disabled made no difference. Is this to be expected or a symptom of user error?
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OpenSim 3.3 and Earlier
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Thomas Uchida
Posts: 1793
Joined: Wed May 16, 2012 11:40 am

Re: Inverse Dynamics with and without Muscles

Post by Thomas Uchida » Wed Jan 04, 2023 9:04 am

The Inverse Dynamics Tool calculates the net joint forces/moments required to generate a tracked movement. Muscle forces are not involved in this calculation so enabling or disabling muscles has no effect. Please refer to the "Inverse Dynamics" section of the User's Guide (https://simtk-confluence.stanford.edu:8 ... e+Dynamics) for more information.
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