simtk.org

Hi, there.

I am trying to use joint reaction analysis to get the ankle forces and moments. In the settings, there is one to input the frame name in 'express_in_frame'. However, whenever value, for instance, 'ankle_angle_l' or 'knee_angle_l' in the <Coordinate name=>, the output result always gave the ones in ground frame. So I presume the system didn't recognise the local frame or I input the wrong ones. Does any one know how to sort it out?

Many thanks,
Linjie

In the settings, there is one to input the frame name in 'express_in_frame'. However, whenever value, for instance, 'ankle_angle_l' or 'knee_angle_l' in the <Coordinate name=>, the output result always gave the ones in ground frame.

The express_in_frame property must be either "ground", "parent", or "child". Please see the "Joint Reactions Analysis" page in the Confluence documentation (https://simtk-confluence.stanford.edu:8 ... s+Analysis, "Input" section) and the XML Browser entry for JointReaction:

My bad. I misunderstood the meaning. Thanks a lot, Tom! Thanks