Boundary Generation And Protection Control For Super Maneuver Flight Motion Of Advance Fighters

With the development of science and technology, the performance of advanced fighters was improved during super maneuver. At the same time, higher requirement of maneuvering security is given for the fighters. Maneuvering security refers to the fighter’s states and control quantity not going beyond the limit boundary during super-maneuver. In order to achieve the carefree handling, the envelope protection system is introduced. For a given boundary value, the envelope protection system can automatically control the limit not to go beyond the limit boundary. That makes big sense to ensure the safety of the flight and to achieve the carefree handling. Therefore, the study of envelope generation and protection is a proactive and challenging subject. Aiming at this subject, the model of advanced fighter is designed. Introducing boundary determination methods and generation methods to generate security boundary.Considering the disturbance of the model, the flight controller is designed. Introducing boundary determination methods and generation methods to generate security boundary.Combing the security boundary and the flight controller we got the envelope protection system. The main works are as follows:Firstly, a nonlinear flight motion mathematic model of the advanced fighters is established. And then, the related analysis is given for the construction, parameter setting, the zero input response of open loop model, coupling characteristics of the channel. Thus, the established model is correct and it can be used as the foundation of predicating and protecting boundary.Then, the flight controller is designed for the fighter model with parameter uncertainty and external disturbance. The SMDO with backstepping method is combined and the robust compensation term to offset the observation error is designed. The stability of the closed-loop system is proved using Lyapunov stability theory. This method has good inhibition effect of composite interference proved by the simulation.Following, the aerodynamic parameters of the fighter is analyzed. Based on this, the definition of flight boundary is advanced, and introduced the mobile boundary determination methods. Using the method of attainable equilibrium sets to get the boundary of the angle of attack during pitching maneuver. We analyzed the influence of the thrust to the angle of attack boundary. In view of the existing boundaries, come up with the idea of trajectory generate method based on obstacle avoidance. Generate security trajectory of the constrained variable, according to the current state and control input. Safety trajectory will be used in the envelope system as a module.Finally, the envelope protection system is designed. The method of dynamic matrix control is introduced to the envelope protection system. The flight controller and the safety trajectory generation system were added in the envelope protection system. Ensure the fighter’s security control both in the normal operating and in the super maneuver. In view of the F-16 model, we verified the performance of the envelope protection system under the super maneuver.The simulation results show that the envelope protection system put up a good performance in the process of super maneuver.