A Study of Multiloop Feedback Flight Control System Having a Positive Effect on Pilot-Induced Oscillation (PIO)

The focus of this study is on PIO to be solved in the development of modern flight control systems. Especially, it is important to investigate the fully-developed PIO as a worst case for the safety of piloted airplanes and to analyze the limit cycle phenomenon including the effects of actuator rate limiting and feedback control loop. Lateral-directional flight control system was taken for instance, this paper proposes a technique to design the feedback control law to have a positive effect on PIO to decrease the amplitude of the oscillation.