Hello James,

One final thing, I've been using the Thelen muscle model but the generic model was using the Schutte_Debrecated before. Could this be the source of the problem?

Thanks, Brandon

Hello James, What you have said makes sense but I don't think it can be the issue in my case. I have uploaded a document showing the triceps long force from CMC, static optimization, fiber length, activation and an associated EMG file that I obtained while performing the experiment this data comes f...

Hello all, I am performing a study in which I obtain muscle forces during throwing. I've done this using both CMC and static optimization. It appears that CMC allows forces which go above the maximum isometric force and seem to be quite large compared to what I get using static optimization. Does an...

Never mind, I was able to find the answer earlier down in the forum. Here's the link for anyone interested:

https://simtk.org/forums/viewtopic.php? ... ity#p11658

Hello all, Could someone explain how the maximum contraction velocity is chosen for a particular muscle in OpenSim? I have two different models I am using of the upper extremity. One has the maximum contraction velocity of the triceps long set to 10 while the other has it set to 0. Any help with thi...

Hello all. I have been trying to find studies using OpenSim in which the authors use open loop forward dynamics to validate control values found through CMC. I have thus far been unsuccessful. The papers I have found so far do use forward control, but it's part of the process in finding CMC values a...

Hello all, I downloaded the SIMM files for the advanced upper extremity model and I used the SIMM converter in OpenSim to turn that model into an OpenSim model. I am using the model to do muscle force analysis for a simplified throwing motion. Could someone tell me a paper or source where I could fi...

Hello all, I have squat data and I have scaled a running model, performed inverse kinematics, inverse dynamics, a residual reduction analysis and computed muscle control. When I run the computed muscle control, the kinematics are produced fairly accurately. When I take the resulting controls and use...

Hello all,

I have some squat data I am trying to use to scale the Hamner running model. For some reason the scaling wont work. Would it be possible for someone to take a look at the scaling file, the data and the static motion capture file to see what the problem might be?

Thanks,

Brandon Brown

Hello all,

I am using 3-D motion data to model a task. The scaled model was run through CMC. The results show altered kinematics. Is this expected behavior? I thought positions were locked and muscle forces are computed.

Any help would be appreciated.