This paper deals with the stabilization of a rotating body-beam system
with torque control. The system we consider is the one studied by Bai
llieul and Levi in [1], In [12] it has been proved by Su and Baillieul
that, for any constant angular velocity smaller than a critical one,
this system can be stabilized by means of a feedback torque control la
w if there is damping. We prove that this result also holds if there i
s no damping.