Go Back   Forums > Self-Supported Forum > AnyBody Model Repository


Thread Tools Display Modes
Old 04-14-2017, 10:36 AM
johntiger johntiger is offline
Junior Member
Join Date: Jul 2016
Posts: 9
Post GRF prediction

Dear AnyBody community,
The grf prediction programme help me a lot and I know how to use it .But I want to know more about the process of calculating the GRFs&GRMs in the GRF predictions files. I open the file "ContactSurfaceDistanceAndVelocityDepLinPush.a ny" and got the details about calculating the GRFs.However,I can't obtain the process of calculating the GRMs.Could you give me more detailed information about GRMs ?


Best regards,
Reply With Quote
Old 04-19-2017, 03:17 PM
toerholm's Avatar
toerholm toerholm is offline
AnyBody Support
Join Date: Feb 2009
Posts: 955

Hi Tiger,

I am sorry but i assume that by GRF you mean moments right?

Here is what the wiki says :

GRF prediction relies on conditional contacts added to the feet of the model. The conditional contacts work as force actuators to generate the normal and frictional forces necessary to balance model. Mathematically, the actuators are modeled similarly to muscles, and the muscle recruitment optimization determines the contact forces. The effect is that the model will utilize the ground reactions if that can minimize the muscle activity
The GRF forces simultaneously also creates a moments since they act on many points and all have friction as a posibility so the GRM are also found comes out of the way the GRF are predicted.

Best regards
TIP: How to save and load results. play_Results

Subscribe to the forums, click the 'Forum Tools' link above the list of threads then select 'Subscribe to Forum'. You will then have the option to choose the subscription mode for this forum and get an email automatically.
Reply With Quote

grf prediction

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT +2. The time now is 11:12 PM.