Research On Control Technology Of Automatic Carrier Landing System

Taking off and landing are the most important and difficult issues considered for fixed-wing carrier aircraft. Aimed at the strong need of improving carrier landing performance, the Automatic Carrier Landing System (ACLS) has been applied to approach guidance and path control for decades. Conbination of engineering application of ACLS in China, the mathematical model of aircraft in the state of carrier approach is established in this dissertation. Simulation results indicate that the character of aircraft during landing procedure is special in low dynamic pressure situation, which is unsatisfied for carrier aircraft landing. Two critical techniques of ACLS are studied. One is the Automatic Power Compensation (APC). By imposing the compensation control laws on the automatic throttle control system, the Automatic Power Compensation System (APCS) is normally required to manage the engine power so as to improve the path control capability of aircraft and relieve the pilot of management task in the state of carrier approach. The other is the control teconology with capability of rejecting turbulence, to effectively reduce the flight path error due to turbulence.In the study of APC, the attitude control system of aircraft is designed in this dissertation so as to achieve tracking control of aircraft attitude, stated the philosophy of APCS with constant angle of attack and the system with constant airspeed , revealed their relationship, studied its contol law and present briefly the design method of parameters. The control law of throttle for a certain aircraft is designed and tested by simulation experiments. On the basis of above, a new fuzzy self-adjusting PID control system and parameter optimization is proposed so as to improve the performance of modern APCS with constant angle of attack.In the study of turbulence rejection, time-domain turbulence models are established in this dissertation. To improve the rejection of turbulence, the H flight control policy and DLC policy are proposed, described their structure configuration and working principle, and then calculated the system parameters on the basis of APCS with constant angle of attack. The numerical simulation shows that they effectively reduce the flight path error due to turbulence and achieve good performance.