What's the function of this Force?

[Taejun (MA Taejun)]

Hi, nowadays I'm working on the modelling of exoskeletons in AnyBody.
Recently I found a project related to my research on Github. But I don't know the meaning or the purpose of this driver. Could you give me some hints?

SitToStand_Exo/TrunkDrivers.any at main · AnyBody/SitToStand_Exo · GitHub
Another question is why they created this torque between the human body and exoskeletons? I think 1000N is too large.

SitToStand_Exo/AdditionalInteractions.any at main · AnyBody/SitToStand_Exo · GitHub
Thank you!

Best,
TJ

[Bjorn (Bjørn Keller Engelund)]

Hi @Taejun

The driver you mentioned is driving the three trunk degree of freedom to be what the initial positions are i.e. to have no moment.

I think the torque is primarily to showcase how it works. But your are welcome to post and issue on the git repo if you need more clarification.

Best regards,
Bjørn

[Taejun (MA Taejun)]

Great, thank you very much！

[Taejun (MA Taejun)]

If the force is primarily to showcase how it works, Can we just delete this force？ Is there any physical meaning of this force？

[Bjorn (Bjørn Keller Engelund)]

The force simulates and actuator from the exoskeleton. You are free to change it as you need

Best regards,
Bjørn