I have some problems in Inverse Dynamics Operation in GRF Model. The error is
Muscle recruitment solver : solver aborted after maximum number of iterations
I found some similar problems and your answer is below or you can just see the link:
[li] Direction of gravity is it specified correctly? this needs to be correct in two places the Gravity property of the study in the labspecific data and in the defintion of the forceplates. I have also noticed the forceplates was rotated wrongly.
[/li][li] In the file Forceplate_GRFprediction.any try to increase the property LimitDistHigh, this controls when contact can occur to if the number is higher the foot do not need to be as close to the ground. see also LimitVelHigh it controls speed limit.
[/li][li] The acceleration of the model could be the reason if your data are not filtered correctly
[/li][li] The model is using a weak residual to the ground that helps holding the balance in the model if the feet contact are not enough, this is defined in the file “Tools/GRFPrediction/Weakresidual.any” here you can increase the strength of the artificial muscles
As my error show before the model contact the plate, So I am wondering the problem may be solved according to your third and fourth answers above. But as for the fourth answer, I can not find the artifical muscles in that fine as you can see in the picture.