DESIGN OF AUTOMATIC FLIGHT CONTROL-SYSTEM FOR TURNING FLIGHT OF HELICOPTERS

This paper is concerned with a flight control system design for the turning flight of helicopters. The longitudinal and lateral dynamics of bare frames of helicopters are almost unstable and/or nonminimum phase and are known to be difficult to control. The flight controllers are not allowed to use comparatively higher gains because the plants are very difficult to stabilize perfectly. An automatic flight control system for the turning flight is designed in this paper, using the approximate perfect servo, which is effective to the control of non-minimum phase systems. The stability of present system does not depend on SAS. The simulation results showed an extremely accurate control, which will substantiate the effectiveness of the present method.