Hi there,
I'm calculating muscle forces with CMC tool, and error occurs. Muscle forces at specific time cannot be calculated.
==================================================================
CMC::computeControls WARNING- small force range for per_long_r (0 to 0)
CMC::computeControls WARNING- small force range for tfl_l (0 to 0)
CMC::computeControls WARNING- small force range for ercspn_l (0 to 0)
SimTK Exception thrown at InteriorPointOptimizer.cpp:264:
Optimizer failed: Ipopt: Infeasible problem detected (status 2)
OPTIMIZATION FAILED...
CMC.computeControls: ERROR- Optimizer could not find a solution.
Unable to find a feasible solution at time = 0.7.
Model cannot generate the forces necessary to achieve the target acceleration.
Possible issues: 1. not all model degrees-of-freedom are actuated,
2. there are tracking tasks for locked coordinates, and/or
3. there are unnecessary control constraints on reserve/residual actuators.
====================================================================
So I'm wondering what I should do to solve this problem. I have checked the possible issues. All model degrees-of-freedom are actuated.
Any advice would be helpful. Thank you.
CMC Warning
- Thomas Uchida
- Posts: 1777
- Joined: Wed May 16, 2012 11:40 am
Re: CMC Warning
Have you tried the suggestion on the "Getting Started with CMC" page in the Confluence documentation, under CMC Troubleshooting, item 1 (https://simtk-confluence.stanford.edu/d ... eshooting:)?
- Ali Khalilianmotamed Bonab
- Posts: 47
- Joined: Mon Aug 13, 2018 6:28 am
Re: CMC Warning
Dear Dr. Thomas K. Uchida,
Hi,
I am also facing this problem while I am trying to reproduce the result of paper titled " Muscle Contributions to fore-aft and vertical body mass center accelerations over a range of running speeds". I read your post on GitHub "Fix CMC slowdown due to reassembly of model within CMCActuatorSubsystem " to solve this issue and also tried the Opensim Manual.
Since I am naive in using the opensim, I could not find .CPP files to modefy them. I would appreciate you, if you help me to fix this problem step by step.
Sincerely,
Ali.
Hi,
I am also facing this problem while I am trying to reproduce the result of paper titled " Muscle Contributions to fore-aft and vertical body mass center accelerations over a range of running speeds". I read your post on GitHub "Fix CMC slowdown due to reassembly of model within CMCActuatorSubsystem " to solve this issue and also tried the Opensim Manual.
Since I am naive in using the opensim, I could not find .CPP files to modefy them. I would appreciate you, if you help me to fix this problem step by step.
Sincerely,
Ali.