DESIGN AND ROBUSTNESS ANALYSIS OF GAIN-SCHEDULED CONTROL-SYSTEM FOR PARABOLIC FLIGHT

The problem of designing a flight control system for the tracking of p arabolic trajectories to guarantee microgravity conditions within the aircraft cabin is considered. The proposed control action consists of two parts. The first one is a feedforward control guaranteeing good tr acking of the desired parabola in the absence of environmental disturb ances. The second part is a gain-scheduled output feedback to countera ct possible misalignments between the desired output trajectory and th e actual one. An estimation of the maximum output displacement in the presence of uncertainties and disturbances (wind gusts) is carried out . Simulation results are provided for a remotely piloted vehicle.