I was using OpenSim 4.0 before. I just uninstalled and reinstalled it.

I reinstalled OpenSim 4.0 on my computer and that has resolved the issue. Thank you for your assistance.

I'm not talking about the point (0, 0) or about a value of 0 N-m for the hip flexion moment. *When looking at hip_flexion_r moment for bifemlh_r over the hip flexion range, the red curve has a value of about -45 N-m at zero degree hip (and the knee is at zero). *When looking at hip_flexion_r moment ...

The model is in the same default position for both graphs. I checked both graphs in separate plotting windows to make sure it wasn't a scale error. I also checked total musculo-tendon lengths and confirmed that they also have different values at joint angle 0. I would like to get this issue resolved...

When plotting hip flexion moment for bifemlh in Gait Body 2392 I notice the values do not match up at 0 degrees for hip flexion (red) and knee flexion (blue). If OpenSim assumes all the other joint angles are 0, then when either the hip or knee angle is at zero the values should be the same, since t...

When I first looked at the translation functions 1 and 2 for the knee, I saw that the independent variable axis had a range of -2.31 to 2.31. I assumed the units were in radians but it appears that 1 unit is about 57 degrees. Specifically: Knee flex 120 degrees = -2.095 units => 57.3 degrees/unit Kn...

Hello, I'm trying to calculate the moment arms in Matlab with wrapping point coordinates copied from OpenSim and my values are not matching up. The methodology I'm using is from Hoy, et al.: http://e.guigon.free.fr/rsc/article/HoyEtAl90.pdf "We calculated the moment arm as the cross product between ...

James,

Thank you for your help. After I read these papers I was able to accomplish the things I needed to do.

Sincerely,
Ben

Like I said in the previous post: I've already looked at the Wiki and it wasn't very helpful. I've also looked at the source code but am not really experienced enough in C++ or Arduino to really understand what the program is doing. It is unclear what variables like excitation, activation, and veloc...

Hello, I am a mechanical engineering grad student working on a project to build a bipedal robot with pneumatic artificial muscles. I wrote the location of attachment points from GaitModel2392 and placed them in Matlab. With this information I've been able to find the total muscle-tendon lengths and ...