I agree that seems like it could be a main problem. However in the GUI when using the same calculated torque through forward dynamics, (which I believe would be considered open-loop control as well?), the suitable motion is found. I believe a main concern still seems to be the presence or lack of pa...

What I was saying is confirming what you stated then, thanks. That the muscles are disabled during both those analyses. I was also saying though that it seems to assume there either is ground contact, or some damping force in the ankle, and other joints, which affects the torque output. When I apply...

Thanks, I removed the muscles and it seemed to be a bit closer. Do you know how the muscles are disabled during ID however, rather than removed? They do seem to have some minor effect still (passive force perhaps?), as the motion seems to be more damped via the GUI. Another thing I was trying was us...

Hi Carmichael, thanks for your reply. I had thought so as well, but when I do load the ankle joint torques into a torque controller, it isn't enough to actuate the ankle from its resting position (where the foot is dangling due to gravity and no ground support). During the inverse dynamics simulatio...

Hi there, Is it possible to calculate the joint torques necessary to follow a desired motion for a model that is constrained at the hip and suspended off the ground? As in there would be no ground reaction forces. I have tried doing this with the inverse dynamics and forward dynamics tools, but even...

Hi Ayman, Thanks for the example, I tried it on the unscaled gait2354_simbody.osim model from OpenSim 4.1, and still got the same error: RuntimeError: std::exception in 'SimTK::State & OpenSim::Model::initSystem()': Failed to connect Socket 'frame1' of type PhysicalFrame (details: Component 'frame1'...

Hi Ayman, Thanks, I was able to see how a weld constraint should be configured with the XML editor, however I still can't seem to to properly describe a body within the <socketframe_1> or <socketframe_2> tags. Following the example from https://simtk-confluence.stanford.edu:8443/display/OpenSim/Open...

Thanks Ayman, That makes sense, I have been trying to implement the WeldConstraint, however it is having a problem finding the socketframe of the bodies to attach to. In my osim model, there don't appear to be any socketframes explicitly defined, so could you let me know how to use elements from the...

Hi there, I am trying to add an external body to a model, and want to constrain it to the skeleton using a weld joint, then to other external bodies using a pin joint. However, I can't seem to be able to apply both, as the first declared joint for a given body supersedes the other. Is there a way I ...