Automatic landing with model predictive control

Abstract

In flight control systems, the landing maneuver is one of the most critical time periods for the aircraft, and it is of great importance to both respond to the disruptors and ensure durability in this time period when the disruptor activity is high. Within the scope of this thesis, 4 different controller type automatic landing systems were designed for a twin-engine passenger aircraft, this landing system provides fully automatic landing in both longitudinal and lateral planes. Within the scope of the thesis, different control architectures in the literature for the automatic landing autopilot were examined. Within the scope of the thesis, the change of system inputs and system outputs as a result of linearization under different conditions has been examined. The consistency of the nonlinear model of the aircraft with the linear model was compared, and this comparison was made by examining the behavior of the system variables in response to the binary commands given to the control surfaces. Within the scope of the thesis, what the sub-phases of the automatic landing autopilot are and according to which criteria and conditions these sub-phases are separated from each other are examined. The classical control architectures in the flight control system (stability-enhancing system and control-enhancing system) are discussed, and for what purposes and with what standards these architectures are designed. In fixed-wing aircraft control systems, the longitudinal and lateral states of the system are separable. In the scope of the thesis, the automatic landing architectures in the literature for these separated states are examined. The controllers designed for the descent system in the thesis are: PID, Linear Quadratic Integral, Model Predictive Control and Algebraic Model Predictive Control architectures. One of these four different control architectures (PID) is in a single-input-single-output control structure, while the other three control architectures (LQI, MPC, AMPC) are in a multi-input-multi-output control structure.