I have a question about applying GRF in Static Optimization for Stair Climbing.
The center of pressure location in vertical direction should be zero or the height of stair?
Thank you very much,
Kang
Static Optimization for Stair Climbing
- Ayman Habib
- Posts: 2242
- Joined: Fri Apr 01, 2005 12:24 pm
RE: Static Optimization for Stair Climbing
Kang,
The GRF is assumed to be measured in ground frame so you'd use the stairs height. Various tools in OpenSim transform the application point to the frame of the segment specified in the tool(usually calcn) before application. If your data does not come in this format you may need to perform some preprocessing to fix it.
In general you can verify if what you ended up with is correct as seen by OpenSim using the motion-data-previewer capability and synchronizing the display of the motion/trc file with the ground reaction forces file.
Good luck,
-Ayman
The GRF is assumed to be measured in ground frame so you'd use the stairs height. Various tools in OpenSim transform the application point to the frame of the segment specified in the tool(usually calcn) before application. If your data does not come in this format you may need to perform some preprocessing to fix it.
In general you can verify if what you ended up with is correct as seen by OpenSim using the motion-data-previewer capability and synchronizing the display of the motion/trc file with the ground reaction forces file.
Good luck,
-Ayman
RE: Static Optimization for Stair Climbing
Thanks, Ayman
RE: Static Optimization for Stair Climbing
Now SO works for stair climbing after I apply the right GRF