Hi Ajay, thanks for your explanation and advice and sorry for replying so late. In the meantime I reduced the stiffness of my contact-model by increasing the thickness of my elastic layer. With that, and slow-target and 0.001 s cmc-timewindow I ran a full cmc-simulation with a max. tracking error of...

Hi Ayman, thanks for your reply. The goal of my thesis is to get a 3D model of an orthosis into OpenSim to see how wearing the othosis affects joint loads and produces contact forces, especially with not-ideal wearingpositions. With the additional picture I uploaded I hope you get an idea of what I'...

Hi, for my diploma thesis I'm trying to calculate contact- and jointforces for the right arm wearing an orthosis. i'm using the model from Holzbaur et al. and linked it to the orthosis via some elastic foundation contact models. The problem is, that the cmc-simulation never finishes and opensim cras...

Hello For my master thesis i also would need an upper extremity model thats capable of dynamic simulations like CMC. I allready contacted one of the project administrators of the dynamic upper extremity model project but without any answer yet. But i've tried to reduce the kinematic model from Holzb...

hello ayman as i said, i really tried everything you suggested without finding a solution. so i really think it is a bug. my guess is that theres something wrong with closed kinematic chains or constraints (as you need them to create closed chains). but not completely 'cause IK and ID gives good res...

well, now i added actuators to every single degree of freedom with infinite activation, but i still get acceleration-constraint-violations at every timestep during static optimiziation. hows that possible? do i have to tell opensim somehow to include the actuators to the calculation? i've simply add...

hi ayman i found a problem with the marker-data i used and fixed it. also i tried to add actuators to the troublemaking degrees of freedom by simply add some muscles between the parts of the orthosis in the .osim-file. inverse dynamic gives me reasonable results and everything looks fine here (no pe...

Hi Ayman The upper part of the orthosis is fixed to the humerus. So, as far as i understand, the system "upper part/humerus" has the same movement and therefor acceleration and is actuated by the muscles that act on the humerus. But for the lower part things aren't that easy. Since the axis of rotat...

Solving inverse dynamics seems to be no problem with this modell. I compared the torques from my model with the ones from the unchanged "arm26" model. They almost look identical except that there are some peaks and imperfections in my model (don`t know where they are comming from). And the torques f...

Today I tried to give all the elements of the orthosis some mass-properties. Now Static Optimization doesn't work anymore. It allways gives me the following message: The model appears unsuitable for static optimization. Try appending the model with additional force(s) or locking joint(s) to reduce t...