Here is another great source that includes more equations.

Generating dynamic simulations of movement using computed muscle control
Darryl G. Thelen, Frank C. Anderson, and Scott L. Delp

<t>Here is what I use as the main source for CMC, and my advisor is Thelen.<br/> <br/> Using computed muscle control to generate forward dynamic simulations of human walking from experimental data <br/> Darryl G. Thelen, and Frank C. Andersonb<br/> <br/> This should also point you to some really goo...

Hi Margarida,

I ran into similar issues when my meshes weren't water tight. Why do you need a a flat 2d mesh? Why not take the geometry and extrude it a little so that it is a watertight, 3d model?

Anne

Does anyone have an example of how to add a prescribed force to my .osim model? I tried looking at the online documentation but I get an OpenSim message that says 'illegal tag body_name.'

If I set <isDisabled> to true in my .osim file for a muscles, what does that do? I can still see the muscle. Does this mean it offers no force whatsover (even passive) to the model? This could be a good way to visualize ligaments. Make a ligament and a disabled muscle?

<t>Hi Ayman,<br/> <br/> I simplified my geometry, but the contact only works sometimes. Between the femur and patella, it works (kind of, there is a lot of penetration). However, between the femur and tibia, a forward dynamics simulation with no muscles activated should just produce a falling motion...

Are there any reasons why OpenSim would just crash during forward dynamics with contact between the patella and femur? I submitted a bug report, but haven't heard anything on whether this is being looked at or what.

Just locking the joints helped. Works in the newest stable release.

I can run forward dynamics on a model with made up EMG signals. However, the motion can go past physiological limits. Is the forward dynamics supposed to comply with clamped coordinates and not go beyond the bounds?

Thanks,

Anne

Well, I don't want to turn off gravity. How do I use the prescribed function option? I see it in the .osim file. Do you have an example? I'm not sure if it is a true/false flag, set it to a certain value, prescribe x,y curve, etc?

Thanks,

Anne