Hi all,

I am now working on the modeling of the human sway motion and considering
using optimal control method to model the neuromuscular system. In my opinion,
the torques on each joint can be the inputs and the joint angle displacement,
velocity and acceleration can be the state variables of the dynamic human
system. But the problem is that this system is not a linear system. So it is
difficult to solve this problem with the optimal control methods.

If you know some methods that can simplify the dynamic human system into a
linear system or can solve the similar problems, could you please give a
guidance or recommend the references?

Thank you very much,

Xingda Qu