Research On Lateral Maneuvering Nonlinear Control Algorithm And Simulation Platform For Hypersonic Vehicle

Considering the increasingly tense international situation and the further requirement of national defense security, the hypersonic vehicle(HSV) has become a research focus of world military powers, and it has immeasurable strategic value in the military and civilian fields. The lateral maneuver control system, an important part of the flight control system of the HSV, is taken as a crucial mean to improve its military survival ability. However, the complex flight environment, external strong torque disturbance and the rudder surface saturation, make the design of the lateral maneuvering reentry control system more challenging. The paper carries out corresponding researches centering on these issues.Firstly, HSV reentry maneuvering models are established. As to the characteristics of strong nonlinearity, strong coupling and fast time variation during reentry maneuvering, the track and attitude angle loop are controlled in reference to BTT control to achieve the HSV no-sliding laterally turning maneuver.Secondly, as for the uncertain control problems during maneuvering, an improved sliding mode disturbance observer(ISMDO) is put forward to estimate the uncertain parameters and external disturbances. On the basis, a nonlinear generalized predictive control(NGPC) method with ISMDO is proposed as the HSV control algorithm, which has achieved a good control effect.Thirdly, in terms of the occurrence of the rudder surface saturation during the HSV maneuvering reentry process, the external anti-windup compensation system combined with NGPC law is put forward to eliminate the influence of rudder surface saturation on the system, thus achieving the control compensation for aerodynamic control saturated surface and ensuring the smooth process of the transverse maneuvering.Finally, a semi-physical simulation platform is built for validating the HSV control algorithm. When it comes to hardware, the connections among the real-time HSV simulation computer, flight-control computer and monitoring computers are completed. When it comes to software, the real-time solution of a mathematical model and controllers is completed. The experimental results show that the simulation platform can effectively examine the real-time and robustness of control algorithms and achieve the expected effect.