GRF, intertia- and gravity-force on a node


#2

Hi Jaques,

Please see this link for an example on how to use the AnyForceMomentMeasure2
https://github.com/AnyBody/support/wiki/All-about-Kinetics#measure-the-moment-created-by-the-muscles-around-a-joint-degree-of-freedom-in-a-certain-coordinate-system

Here is the explanation from the manual
"This functionality of AnyForceMomentMeasure2 can be interpreted a bit like a free-body diagram: Your system is the segments you have specified in the AnyForceMomentMeasure2 object. The forces, you have included, are the ones that have your current attention, and the output is the total equivalent force and moment (with reperence to a specific point). Notice that including all forces on a segment or a system of segments should ideally give zero equivalent force and moment due to equilibrium, but this must indeed include all forces including reactions, forces of gravity, and inertia forces. "

This means that in your case also the foot, and talus segments, certain muscles, should be included as i see it. You need to think of this measure as a way to make a free body diagram and you decide what is in it.

Please try to look at the first link above and try to make a small simple example for your self to learn the way it works, before applying it on the human model. This measure is very general and can be used for many things but it is also easy to make mistakes using it.

Best regards
Søren


listed #3