How to define the drive of the exoskeleton and collect the appropriate c3d data

Hello. I want to use anybody to simulate the knee joint moments of a human wearing an exoskeleton (while using c3d data). I now have a hip driven exoskeleton model and I would like to ask how to set up the hip drive and what positions of c3d data need to be collected?

The exoskeleton is powered by using the motor of the hip joint to pull the cord attached at the calf.

Best Regards
ZM

Hi @zzzzm0120

It very much depends on your exo skeleton design.
If your mechanism only works on the lower body and you are only interested in output from the lower body then you can collect motioncapture data + force plate data from the lower body.
Otherwise, if you want to use GRF prediction or are interested in the upper body, then you should collect full body MoCap data.

It is a little hard to say how to implement your hip exo mechanism without knowing it.
If your exo is a CAD model from SolidWorks then we have a SolidWorks2Anybody plugin that can translate your CAD model to the Anybody software, with all the mates and components.

Best regards,
Bjørn

Can I use only c3d data for knee moment prediction without collecting plantar pressure? Our exoskeleton is attached to the hip joint of the human body and assists the human body by pulling the cord through the motor. So I would like to ask how the rope is modeled in anybody system?
Best Regards
ZM

Hi @zzzzm0120

You could model your cord mechanism as a spring with a function of how it works. There are classes in anybody to do that.

what motion do you want to investigate?
is it only motion around the knee or is it full gait ?

Best regards,
Bjørn

I want to study the effect of exoskeleton on the torque of human knee joint. This exoskeleton is loaded on the hip joint and is assisted by a rope pulling the calf. I hope you can give me some advice about it.
Best Regards
ZM

You can define a AnyKinPLine representing the rope path and then a AnyForce3D to pull.

I do not know the exact design or you research goal so bear that in mind.
It would help if you answered some of the questions in the posts above.

Best regards,
Bjørn