Inconsistent values for joint reaction analysis

We describe here the methods we used to create a detailed musculoskeletal model with 84 degrees of freedom and 134 muscles. Our model has three key-features: three-dimensionality, scalability, and modularity. We tested the validity of the model by identifying forelimb muscle synergies of a beagle at walk.
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Maxence Lavaill
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Joined: Thu Mar 07, 2019 10:00 pm

Inconsistent values for joint reaction analysis

Post by Maxence Lavaill » Thu Mar 07, 2024 6:02 pm

Hi team,
I am sharing my post from the general OpenSim forum here as well --> viewtopicPhpbb.php?f=91&t=17652&p=0&start=0&view=

Any idea on why the JRA tool seems inconsistent with the dog model?
Thanks !
Max
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Heiko Stark
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Joined: Tue Jan 05, 2016 6:59 am

Re: Inconsistent values for joint reaction analysis

Post by Heiko Stark » Mon Mar 11, 2024 8:05 am

Dear Maxence Lavaill,

This seems to be a bug. Set the Precision for Output to 8, then normal values should be calculated.

I would also activate "Solve for equilibrium for actuaytor states".

Best regards,
Heiko
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Maxence Lavaill
Posts: 6
Joined: Thu Mar 07, 2019 10:00 pm

Re: Inconsistent values for joint reaction analysis

Post by Maxence Lavaill » Mon Mar 11, 2024 5:32 pm

Thanks Heiko, it works!

It seems that the main issue was the unticked "Solve for equilibrium for actuator states" as it now works even with a precision of 12.

I had never ticked this before thinking that I didn't need for pure inverse dynamics problem, but it seems that it is still rather important.

Again, thank you :)
Max
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