Synergy Plugin with Lerner model
Posted: Sat Apr 11, 2020 3:12 am
Dear,
I have managed to run the Synergy plugin through Opensim 3.2-32bit, using a scaled Lerner model (92 muscles) and kinematics/GRF data from Cams-Knee project. Although standard Static Optimization (SO) routine runs smoothly without errors, when running SO with synergy plugin with an identity matrix (no change in weights) I get errors in every frame - the optimizer cannot find solution.
Also, muscle forces between the two workflows do not match - as opposed to what is stated by the authors.
An example of the error follows:
time = 5.308 Performance =3.74146 Constraint violation = 3.73172
SimTK Exception thrown at InteriorPointOptimizer.cpp:261:
Optimizer failed: Ipopt: Maximum iterations exceeded (status -1)
OPTIMIZATION FAILED...
StaticOptimization2.record: WARN- The optimizer could not find a solution at time = 5.31633
Now matter how I change all parameters (optimizer_convergence_criterion,optimizer_max_iterations, etc) , I get the same errors. Any help is welcomed.
An example setting file can be downloaded from here.
https://drive.google.com/open?id=1T-2ZH9LzPXr3dE_pjiNOosKZr6Dz-FPd
I have managed to run the Synergy plugin through Opensim 3.2-32bit, using a scaled Lerner model (92 muscles) and kinematics/GRF data from Cams-Knee project. Although standard Static Optimization (SO) routine runs smoothly without errors, when running SO with synergy plugin with an identity matrix (no change in weights) I get errors in every frame - the optimizer cannot find solution.
Also, muscle forces between the two workflows do not match - as opposed to what is stated by the authors.
An example of the error follows:
time = 5.308 Performance =3.74146 Constraint violation = 3.73172
SimTK Exception thrown at InteriorPointOptimizer.cpp:261:
Optimizer failed: Ipopt: Maximum iterations exceeded (status -1)
OPTIMIZATION FAILED...
StaticOptimization2.record: WARN- The optimizer could not find a solution at time = 5.31633
Now matter how I change all parameters (optimizer_convergence_criterion,optimizer_max_iterations, etc) , I get the same errors. Any help is welcomed.
An example setting file can be downloaded from here.
https://drive.google.com/open?id=1T-2ZH9LzPXr3dE_pjiNOosKZr6Dz-FPd