Adaptive Gian Scheduling Strategies for Aircraft Longitudinal Maneuvers Control

Suppose an aircraft that has a steady state turning fly and wants to have longitudinal movement. Due to some criteria such as instability, model uncertainty and disturbances, the movement of this aircraft is virtually impossible with just the direct adjustment of inputs (e.g. aileron, rudder and elevator angle) and without the help of a controller.in this paper used the gain-scheduling mothod for design of controller. In the gain-scheduling method, linearizing the system is done around some operation point. Moreover it designs some linear controllers that will be switched into the system based on the systems current operation point.    In this paper, the problem of determining multiplicity of equilibrium pints in gain-scheduling method for an aircraft to have longitudinal movement is considered. Also we seek to find a criterion to tell us when each particular controller should be used which is carried out through stability margin observations and the ν-Gap metric.     The results show that with the combination of a gain-scheduling nonlinear controller and a nonlinear system in a closed loop, the desired longitudinal maneuvering was done satisfactorily.