The models used in OpenSIM are an approximation of the biological models, and the motion capture used for inverse kinematics carries errors in movement that are revealed in multi-body accelerations that would be nearly impossible for our musculoskeletal system to perform. The reserve actuators exist...

Update:
I have solved my issue and it was indeed because I had noise in the GRF files.
Here's the thread where I explain it better:

viewtopicPhpbb.php?f=91&t=8289&p=22774&start=0&view=

Just a quick follow-up: Filtering the GRF filtes worked! I had some problems at first because I forgot that adding a single-pass filter would result in a delay of the resulting signal, and this skewed my results. I had to apply a zero-phase filter (2nd pass inverted) to the initial results to get th...

Hello, I'm still struggling with high-frequency noise in my SO results from another thread. (see here: https://simtk.org/plugins/phpBB/viewtopicPhpbb.php?f=91&t=8059&p=0&start=0&view=&sid=512017208a7b7d28283b92c8b99c16e0 ) I was wondering if the problem might be because all my GRF files also have no...

John Rogers (the original poster) made a very good tutorial on how to import new solid geometry to opensim. I'm afraid I can't find it anywhere within the documentation, so here is the PDF: SolidWorks parts to OpenSim.pdf (Note: this is not my doing, it's from John Rogers. I've just had this documen...

Hello Adrian and thank you for your input! The subject of the passive forces came up in a question I put in another thread where I ran Static Optimization only: https://simtk.org/plugins/phpBB/viewtopicPhpbb.php?f=91&t=8081&p=0&start=0&view= Regardless, in the Analysis tool I'm only using the muscle...

Hello,

I can't find a way to attach the MuscleAnalysis to SO using the GUI.
Is it possible to just run "Analyse" and activate "MuscleAnalysis" while using the SO output as controls and the motion file that I used in SO?

Here's the description:

Greetings,

I've been advised to check the passive muscle forces in my model.
How do I observe this factor? Running Static Optimization I get "muscle force" and "muscle activation" files. How do I distinguish passive forces from active/controlled forces?


Thank you for your help!

Thank you for your reply Tom!

Just one question: to what model should I compare these parameters (maximum isometric forces, fiver lengths, passive forces, moment arms) with?

Are the gait2392 results a good starting point or should I seek others?

Hi,

Sorry guys but I'm still in a pinch...

Any help, just a hint on where to look at would be really appreciated.

Thanks!