高超声速飞行器有限时间耦合模糊控制

Aiming at the attitude-coupling control problem of hypersonic vehicles, this paper proposes a limited time fuzzy control scheme based on attitude coupling characteristics. A rudder system is first introduced into the attitude dynamic model of hypersonic vehicles with consideration of the engineering reality, thereby establishing a relatively perfect attitude dynamic model. By introducing the desired attitude tracking instructions, a control-oriented attitude error model is established. Secondly, a finite-time controller is designed using the terminal sliding mode as a whole. Meanwhile, based on the coupling evaluation, a fuzzy control method is adopted to solve the system adaptability to the coupling and the chattering of the coupling. To solve external disturbances, a disturbance observer is used, followed by verification of the system stability based on the Lyapunov stability theory. Finally, considering the characteristics of the rudder system, aerodynamic deflection, and control chattering in the process, the simulation proves the effectiveness of the method.