Hello, I have some lab results consisting of gait tests with camera markers and pressure plates. I did all the scaling and inverse kinematics procedures and they seem to be correctly done. Then I ran RRA for each test, after which I ran SO to study muscle activation. I used the gait2392 default file...

Hi, The contact forces in OpenSim use the Hunt Crossley model, which is a contact between a sphere and a plane or between two spheres. You can see examples of the pre-set Hunt Crossley contacts in the *.osim file of the first example shown the "Dynamic Walking Challenge" tutorial: http://simtk-confl...

You need to place the geometry STL files into OpenSIM's folder, and then edit the gait2354.osim file to include the new geometry. To do this you should create a new "body" within the "BodySet" group. I advise you to use Notepad++ to edit the file, as it's very convenient to tell you how the things a...

Thank you again for your reply. Why are the experimental results from Liu et al and John et al not fit for research? I need experimental data so that I can compare muscle activity between experimental results and a simulation of the same body with added weights (e.g. an orthosis), in order to evalua...

Thank you for your reply! I was talking about the source for the measurements, not their values as I know they are present in the files (at the very worst I could just sum the weights of all bodies in subject01). So just to make sure: Other than OpenSIM's online documentation, there's no source (as ...

Greetings, I want to properly reference the experimental data that is included in the current Gait2392 model. The standard model seems to have around 78Kg, but the experimental data, after running the scaling procedure, seems to refer to a person with 72Kg. I tried looking at the files using a file ...

Yes. If you give a new name to the femur's body (e.g. femur2_r instead of the default femur_r) then you'll have to edit the muscle paths to cross the new body, or you'll probably get an error while opening the model in OpenSim. If you just edit the existing femur_r to use the new parameters and geom...

Hello,

In the followup of this discussion, I would like to know if someone has attempted to use rolling constraints as shown in this article:

http://dx.doi.org/10.1016/j.jbiomech.2013.03.030

You can't change the geometry in the osim file. What you can do is create another geometry file (e.g. femur2.stl), copy it to the geometry folder in opensim and then edit the osim file to refer to the new geometry file, under <DisplayGeometry> of the intended femur (left, right or both). And then yo...

You can edit all the parameters of each body through the *.osim file, using a text editor. It uses XML annotation so a programming-oriented text editor like "Notepad++" is highly recommended. Here is the part of the online documentation explaining what you're looking for: http://simtk-confluence.sta...