Hello, I am having a hard time getting RRA to to complete for a 3.3 m/s running simulation. I am using the gait2392 model with no arms. I used the Visual3D-->OpenSim pipeline to process the c3d data to mot data (inverse kinematics) and get manual scaling factors to apply in the scale analysis. When ...

How would I add a forward dynamics simulation into the controller to do this?

If CMC does indeed do a forward dynamic simulation at each time point, then I don't need to modify the current CMC implementation. How can I verify this?

Thanks,

Anne

Hello,

When I run CMC on the ControllerExample, I get an error that the process has been terminated. It doesn't run. Has anyone else tried this?

Thanks,

Anne

Hi Sherm, That makes sense. Is there a way to better calculate the acceleration induced by each muscle then, as is done in CMC? I'm thinking a forward dynamics simulation within the controller. Within the controller, apply 1 N of muscle force to the equations of motion, calculate what the induced mo...

Hello, In the ControllerExample, the activation of the muscle is just based on the desired force. I would also like to include the force of the other muscle in this since Fdes = mass*desired acceleration - force in the other muscle. However, when I use double FmuscleForce = muscle->getForce(s) in th...

Hello,

How do I take the ControllerExample and make it a plugin for use in a forward dynamic simulation?

Thanks,

Anne

Hello, I am comparing hip kinematics calculated from the inverse kinematics tool of OpenSim and using custom C code with the SIMM dynamics pipeline. Both are solving the same optimization problem (sum of weighted errors squared). However, I get slightly different results. I think this may be in how ...

This is very helpful. However, how is this part done:

"For each of these triangles, the point S on body B’s surface closest to the centroid is determined"

There wasn't anything on the elastic foundation model.

What algorithm does OpenSim use for contact detection and force calculation? Any sources? I can't find this in the manuals.