Hi Samuel,

Sorry, just checked the post.
Glad you figured it out.

Snehal

Hi Samuel,

I used two separate force plates.
As far as I can tell from my data, the individual forces for each leg can be very different. Splitting them evenly is contentious.

Snehal

Hi Samuel,

The toolbox is very easy to modify for sit-to-stand or squat tasks. I was able to do that in MATLAB.

Snehal

Hello Bianca,

This can be usually fixed by carefully choosing the weights for each rot/trans motion in the RRA tasks xml file. Too much weight for a particular parameter can produce the effects you described.

Hope this helps,
Snehal

Hello Ajay,

Thanks a lot for your suggestions. The PointKinematics tool seems what I need to verify my results. I will try it out and let you know.

Thanks,
Snehal

<t>Hello Ayman,<br/> <br/> Thanks a lot for your help.<br/> I successfully implemented the <CoordinateCouplerConstraint> option and I get similar results as compared to my initial approach.<br/> It would be great to validate the 6th DOF since I have experimental values for it, but unfortunately I am...

<t>Sorry, that did not turn out to be readable.<br/> retrying...<br/> <br/> <SpatialTransform name=""><br/> <!--3 Axes for rotations are listed first.--><br/> <TransformAxis name="rotation1"><br/> <function><br/> <LinearFunction name=""><br/> <coefficients> 1.00000000 0.00000000 </coefficients><br/>...

<t>Hi Ayman,<br/> <br/> I am not using any of those methods.<br/> Here is a snippet from my .osim file:<br/> <br/> <TransformAxis name="rotation1"> <function> <LinearFunction name=""> <coefficients> 1.00000000 0.00000000 </coefficients> </LinearFunction> </function> <coordinates> knee_angle_r </coor...

<t>Hi Ayman,<br/> <br/> Thanks for the quick response.<br/> This does answer my question.<br/> However, just to clarify, I have not created new coordinates. I just provided new values for all rotations/translations functions of knee flexion as is done in the default 2392 OpenSim model. Does your ans...

<t>Hello all,<br/> <br/> I have prescribed subject-specific experimentally derived knee motion (ab/add,int/ext, tx and tz) as a cubic spline function of knee flexion angle in the .osim model file. <br/> My question is: Will OpenSim follow this motion exactly for all algorithms (IK, RRA and CMC)? <br...