Hi AnyBody-People
In the meantime my AnyBody-model is walking' quite nicely (but perhaps still a bit groggily). My model consists now of one leg and the pelvis. I've modelled all three joints as spherical joints to be able to simulate also the small ab-/adduction and rotation angles in the knee and the ankle. However, only in the hip joint, the muscles contribute to the joint moment in all three directions. In the knee and the ankle, the muscles should only be responsible for the flexion/extension moment, whereas the forces in ab-/adduction and rotation direction should be carried by other structure and therefore be represented by the joint reaction force. Is it correct to do these by means of setting the Reaction.Type (in the AnyKinEq…Driver) to either 0 or 1? I'm not sure if I've understood the
Reaction.Type’ correctly: 0
means that the muscles have to carry this force, and 1 means that
it’s a force from the outside?
Thus, if I define the drivers for the joint angles, the Reaction.Type
for the hip will be {0,0,0} and for the knee and ankle {1,1,0}. Is
this correctly done?
My other question concerns the implementation of the ground reaction
force.
I’ve created the dummy segment according to the example in the Gait2
file; thus one segment for x-, y- and z-direction:
But the ground reaction force acts always on the same point at the
foot (for example at the node `Foot.Ground.Joint’) what is obviously
not realistic. How can I vary the point at the foot where the force
acts on over time? Do I have to create another dummy segment
connected to the foot via a prismatic joint and to drive this segment
afterwards according to the measured point of load incidence of the
ground reaction? Isn’t there an easier way?
I’ve always got an error message when I wanted to drive a spherical
joint by means of AnyKinEqInterPolDriver. I’ve defined all three
joint angles in the same text file [time abduction rotation flexion].
I’ve solved the problem by creation three drivers and three separate
text files. Isn’t it possible to define the three joint angles in a
single file?
Thanks for your help.
Christine