Question regarding Static Optimization Constraint

Provide easy-to-use, extensible software for modeling, simulating, controlling, and analyzing the neuromusculoskeletal system.
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Feras Kiki
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Joined: Sun Jul 17, 2022 12:16 pm

Question regarding Static Optimization Constraint

Post by Feras Kiki » Fri Sep 15, 2023 7:54 am

Hi all,
I am doing a Static Optimization and the model seems to be working well visually, but I am getting constraint violation. The values are very small, so I am not sure about how much impact this has.
This is an example of the output at one time instant
time = 8.55723 Performance = 3.32146 Constraint violation = 4.67229e-12
The value of the violation is basically zero. Does this mean that the model works well for my example?
Additionally, how can I verify the output of the simulation?
I am getting forces and muscles activation, but what is the best to verify the value of the outputs ?

All your help is much appreciated,

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Mohammadreza Rezaie
Posts: 407
Joined: Fri Nov 24, 2017 12:48 am

Re: Question regarding Static Optimization Constraint

Post by Mohammadreza Rezaie » Wed Sep 20, 2023 3:23 pm

Hi, your constraint violation value is fine (low enough). Please see these posts as well:
viewtopicPhpbb.php?f=91&t=9258&p=0&start=0&view=
viewtopicPhpbb.php?f=91&t=14135&p=0&start=0&view=

For evaluating your simulation, there is a great paper by Hicks et al. (2015), and also, this page:
Getting Started with Static Optimization - Evaluating your Results

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