The Research Of 737-800 Aircraft Approach Control Law

The aircraft 737-800 is taken as research subject whose longitudinal and Lateral-Directional model are analyzed and simplified models are set up. Using the QAR data which are gathered from the aircraft, the identification algorithm is employed to estimate the parameters and then the math model is got. The PID-ADRC is used to design the longitudinal and lateral control law.The content of the thesis is summarized as follows:(1)Based on the simplified longitudinal linear motion model and lateral-directional linear motion model which are used as candidate model, combining ELS method with RML method as identification algorithm which is used to identify the models of longitudinal channel that is pitch angle to elevator and lateral-directional channel that is roll angle to aileron at 737-800 approach phase.(2)Apply PID-ADRC Theory on Glide Beam Guidance System and Flare Landing System of the longitudinal channel whose inner loop are controlled by ADRC while outer loop controlled by PID. PID-ADRC mix-controller for Lateral Beam Guidance System of the lateral channel is designed.(3)The step response of the PID-ADRC mix-controller and the response under the real pitch or roll angle input on Glide Beam Guidance System, Flare Landing System and Lateral Beam Guidance System are simulated. The simulation results indicate that PID-ADRC mix-controller is perfect.