Search found 1041 matches
- Mon Oct 28, 2024 9:04 am
- Forum: OpenSim Moco
- Topic: Required additional External Forces needed for MocoInverse
- Replies: 1
- Views: 90
Re: Required additional External Forces needed for MocoInverse
Hi Adam, Yes, you would likely need to add a foot-ground contact force element to your model to model the effects of the shoe/sole stiffness. You will probably need to use MocoTrack or a custom MocoStudy though, since your input kinematics will probably not produce correct forces at the feet "out-of...
- Sat Oct 19, 2024 9:46 am
- Forum: OpenSim Moco
- Topic: how to calculate muscle force
- Replies: 11
- Views: 582
Re: how to calculate muscle force
Hi Neha, I am not sure what you mean by this. If you problem converged and the controls are at the middle of the control bounds, then it probably converged to a local minima. There are many factors that might explain this: cost functions terms (and their weights), model complexity, choice of initial...
- Sat Oct 19, 2024 9:42 am
- Forum: OpenSim Moco
- Topic: Linear Velocity Constraint or Goal
- Replies: 9
- Views: 604
Re: Linear Velocity Constraint or Goal
Hi Cedric,
OpenSim (and Moco) uses SI units: meters, radians, Newtons, etc. Speed is measured in meters per second (m/s).
Best,
Nick
OpenSim (and Moco) uses SI units: meters, radians, Newtons, etc. Speed is measured in meters per second (m/s).
Best,
Nick
- Thu Oct 17, 2024 1:14 pm
- Forum: OpenSim
- Topic: calculation of center of pressure using Hunt and Crossley contact model
- Replies: 3
- Views: 462
Re: calculation of center of pressure using Hunt and Crossley contact model
Hi Park, You will be able to calculate forces that way, but I don't think the forces from a foot-ground contact model computed directly with IK kinematics will be very accurate. The IK solution will not capture the fine kinematic between the foot and the ground that are important for good force esti...
- Mon Oct 14, 2024 10:20 am
- Forum: OpenSim Moco
- Topic: Capturing terminal output in Google Colab
- Replies: 2
- Views: 214
Re: Capturing terminal output in Google Colab
Hi Ana,
If you're looking for the Ipopt output, you can add an ipopt.opt (Ipopt options) file to your working directory to specify where the Ipopt output should be directed to.
I haven't found a more general solution for this, but will let you know if I do!
Best,
Nick
If you're looking for the Ipopt output, you can add an ipopt.opt (Ipopt options) file to your working directory to specify where the Ipopt output should be directed to.
I haven't found a more general solution for this, but will let you know if I do!
Best,
Nick
- Thu Oct 10, 2024 10:41 am
- Forum: OpenSim Moco
- Topic: how to calculate muscle force
- Replies: 11
- Views: 582
Re: how to calculate muscle force
Hi Neha, Your problem appears to be infeasible (i.e., the problem cannot enforce the dynamics constraints in the direct collocation problem). I'm not sure about the MUMPS memory issue, but it might be related to Ipopt entering "restoration mode" in order to address the infeasibility issue. I would r...
- Thu Oct 10, 2024 10:25 am
- Forum: OpenSim Moco
- Topic: Determining Muscle Forces From MOCO Solution
- Replies: 9
- Views: 692
Re: Determining Muscle Forces From MOCO Solution
Hi Brodie, MocoTrack is just a tool for configuring a MocoStudy for tracking optimization problems. You can access the internally configured MocoStudy using "initialize": track = MocoTrack(); % your tracking problem configuration study = track.initialize(); solution = study.solve(); outputPaths = St...
- Wed Oct 09, 2024 9:14 pm
- Forum: OpenSim Moco
- Topic: Changing Weld Joints to Track Kinematics and Actuation around that Joint
- Replies: 2
- Views: 209
Re: Changing Weld Joints to Track Kinematics and Actuation around that Joint
Hi Adam, As long the actuators (including muscles, if relevant) are strong enough to produce the joint motion for the MTP joint, you should be able to get your problem to solve. However, we usually apply ground reaction forces to the model when using MocoInverse, and currently there is no good way t...
- Wed Oct 09, 2024 8:57 pm
- Forum: OpenSim Moco
- Topic: how to calculate muscle force
- Replies: 11
- Views: 582
Re: how to calculate muscle force
Hi Neha,
Please refer to my recent post on this thread for more guidance: viewtopicPhpbb.php?f=1815&t=18886&p=51523&start=0&view=.
Best,
Nick
Please refer to my recent post on this thread for more guidance: viewtopicPhpbb.php?f=1815&t=18886&p=51523&start=0&view=.
Best,
Nick
- Wed Oct 09, 2024 8:56 pm
- Forum: OpenSim Moco
- Topic: Determining Muscle Forces From MOCO Solution
- Replies: 9
- Views: 692
Re: Determining Muscle Forces From MOCO Solution
Hi Brodie, The correct format in Matlab would be as follows: study = MocoStudy(); % your study configuration here solution = study.solve(); outputPaths = StdVectorString(); outputPaths.add('/forceset/vaslat_r|tendon_force'); outputs = study.analyze(solution, outputPaths); The "outputPaths" argument ...