Hi again,
The classical inverse dynamics now works perfectly on my sit-to-stand model.
Thanks again.
But now, when I run the muscle recruitment analysis, I get:
ERROR(OBJ1) : C:\Documents and Settings\Jean-Olivier
Racine\Desktop\LIO\Anybody\Repository.6\ARep\LIO\STS Test
4\MuscleStudy.any(1) : ‘MuscleStudy’ : Muscle recruitment analysis
failed, simplex solver reports that solution does not satisfy all
constraints.
My questions:
- From the (Damsgaard, Rasmussen, Christensen, 2001, ASME) article on
the min/max optimization criteria, I see that the constraints used for the
min/max criteria are quite classical and are 1) the dynamics equilibrium
equations and 2) the muscle pull constraint. Is there a way to know which of
these two constraints is not satisfied by the simplex solver? I know the
simplex solver, in essence, doesn’t naturally allow it. but we never know. - I tried running the analysis with 4 different trials (data set) and
in each case, the error appears exactly at seat-off. Knowing that currently
I do not include the seat force but only the ground force, could that be the
problem? If it is, what interactions within anybody explain that problem? I
am surprised that the problem does not appear right from the beginning, when
the seat force is missing, and not when the seat force disappears
(seat-off).
I uploaded the model to the group. Filename is JeanOlivier2.rar.
Thanks,
Jean-Olivier
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