"WARN- small force range" just means that at that time point in the simulation, the force produced by the muscle is not affected by the activation. In other words, no matter if the activation is 0 or 1, the force produced by the muscle is about the same magnitude. This can happen for two reasons (th...

Chris, just a follow up. How are you getting these forces? With the plotter?

<t>Hi Chris,<br/> <br/> Someone (e.g., Ayman) might need to correct me, but I am pretty sure that when you do not specify an activation, the analysis the reports active fiber force with an activation of 1 (or fully activated). Might be a bit misleading, but this is intended to give you the max capac...

<r>Yi,<br/> <br/> There are two good places to check out recommendations for improving RRA and CMC results:<br/> <br/> (1) The OpenSim Wiki: <URL url="http://wiki.simtk.org/opensim/">http://wiki.simtk.org/opensim/</URL><br/> (2) The Musculoskeletal Modeler's Kitchen: <URL url="http://wiki.simtk.org/...

<r>Hi Rudi,<br/> <br/> The mass change recommendation from RRA comes from errors in both kinematics (i.e., joint angles from IK) and modeling errors. Even though you total mass may be accurate, the mass distribution among segments of the model might not exactly represent that of your subject, so it ...

<r>Hi Matthias,<br/> <br/> Below are my responses to your questions:<br/> <br/> Q: "Is this the right way and is the scaled model now adjusted to my subjects anthropometric data?" A: Yes, this sounds like the correct procedure to me....<br/> <br/> Q: "Or should I set more important markers to a high...

<r>Hi Yi,<br/> <br/> Great enthusiasm! It is fantastic that you want to create a place for others to share their successes and challenges with OpenSim.<br/> <br/> You might also want to check out a new project recently started by Edith Arnold called The Musculoskeletal Modeler's Kitchen, which is al...

<r>Hi Jerry,<br/> <br/> Check out this SimTK project which has walking simulations at multiple speeds for multiple subjects: <URL url="https://simtk.org/home/mspeedwalksims">https://simtk.org/home/mspeedwalksims</URL><br/> <br/> The data can all be loaded into OpenSim using existing models. The simu...

<r>Hi Matthias,<br/> <br/> I have seen this problem too, usually because it's difficult to place the virtual markers on the feet of the model in exactly the place as on your subject. To get around this, I usually take a photo of the sagittal view my subject during the static pose to estimate the ank...

<t>Hi Bruno,<br/> <br/> As Ayman suggested, you will use these results to choose the optimal forces for the residuals actuators in RRA (i.e., FX, FY, FZ, MX, MY, MZ). But what is not clear is that these are named differently in the Inverse Dynamics solution. For example, pelvis_tx_force corresponds ...