Model floating up and down following RRA

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Cai Birch
Posts: 31
Joined: Tue Jan 02, 2018 7:40 am

Model floating up and down following RRA

Post by Cai Birch » Fri Jun 15, 2018 2:43 am

My model is floating up and down (and also rotates slightly around the Z axis) when running RRA. I've tried going through the 'Forward Simulation of Stance Phase' (https://simtk-confluence.stanford.edu/d ... ance+Phase) hoping for some intuition but failed to find any. My model is performing a counter movement jump with each foot on a seperate force plate. Could anyone help point me in the right direction as to how to resolve this issue please?
Tags:
OpenSim 3.3 and Earlier
GUI
Windows
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Nicos Haralabidis
Posts: 188
Joined: Tue Aug 16, 2016 1:46 am

Re: Model floating up and down following RRA

Post by Nicos Haralabidis » Fri Jun 15, 2018 2:59 am

Hello Cai,

Here are some key considerations I have picked up from other researchers' advice when using the RRA tool.

a) Which model are you using? Does it include the trunk segment?
b) Are the ground reaction forces in the correct coordinate system? Are they applied to the correct body? Is the COP in the correct location?

Kind regards,

Nicos Haralabidis
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