Static Optimization Fails

A shoulder model with an accurate scapulothoracic joint and includes scapular muscles to drive its motion. The model can be used to compute the work done by the thoracoscapular muscles during shrugging and any arm elevation task.
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Ibrahim Hasan
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Joined: Tue Feb 22, 2022 11:33 am

Static Optimization Fails

Post by Ibrahim Hasan » Wed Jan 04, 2023 7:46 am

I'm trying to run static optimization on the Thoracoscapular model and it runs into the problem reported in this issue (viewtopicPhpbb.php?f=91&t=12083&p=34162&start=0&view=)

ground_thorax_rot_x: constraint violation

Any Clues why?

Thanks in advance!
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Maxence Lavaill
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Joined: Thu Mar 07, 2019 10:00 pm

Re: Static Optimization Fails

Post by Maxence Lavaill » Wed Jan 10, 2024 10:39 pm

Hi Ibrahim,

I know your post is quite old now, but I will try to help you and others.
I believe the issue comes from the AC constraint in the model. Static optimisation struggles to satisfy both joint torques and the AC constraint at the same time.

If you have marker data, you should try running IK using the AC constraint.
But once you have your joint angles as a mot file, you want to deactivate the AC constraint in the thoracoscapular model to run SO smoothly with residual actuators.

I hope this helps =)
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