We are looking for people in control theory working on the problem of regulation output for non-autonomous linear systems on infinite dimensional state spaces.
Additionally one can put a static charge on a spacecraft and this will create a force that is the result of a cross product between the spacecraft velocity vector and the magnetic field direction. However this force is very small and the charge is hard to maintain, so it is generally considered useful only for very specialized applications.
Thanks for your answer, in fact it's not easy for me to find concret examples for PI-controller of a non-autonomous linear system! If you have any example or application to inspire me i'll be gratful!