Thanks a lot for your reply, Ayman.
I think I understand your explanation. I first thought that I might have to use a tag to add a muscle into the actuator file to adjust its properties but I forgot that I can adjust them in the .osim file. So I'm OK with this now. thanks again.

To whom it may concern,
I had a question about the actuator file for CMC. There are some actuator tags we can use for coordinate or joint are <CoordinateActuator> or <PointActuator> ,<TorqueActuator> . I was wondering what tag should I use for the muscle I want to add into the actuator file?

Thanks a lot, Thomas. I'll try your suggestions to see if the result improve.

Dear all, I am now working on the simplified version of ULB model. I use the simulation data from this project in SimTK https://simtk.org/frs/?group_id=899 . The model goes well on IK,ID,RRA, but failed in CMC. I always got the error below: Exception: Model::equilibrateMuscles() Unable to compute eq...

Thanks Kaiwen. Grateful for your reply. Can you tell me where did you get this information?

Hello there, anyone can help?
If you don't understand my question, I can try another way to explain.

Dear all, I have a small question about the setting of CMC. CMC go through two steps to achieve the tracking which are static optimization and forward dynamics. When I was using the Static optimization tool, there are two functions that I can choose to use as the relationship between activation and ...

thanks Kaiwen. I realize that i was thinking it too complicated that I couldn't see through the algorithm clearly before. However I understand now, thanks again.

Thanks you for your reply, Kaiwen. I think I finally understand it.
Gary.

A future desired acceleration is computed (see link above) using a PD controller. In OpenSim, with static optimization one can try to find the muscle activation or excitations that minimizes the distance between a desired acceleration and an induced acceleration due to the excitations. Thanks you, ...