Predictive Controller Design And Visual Simulation For Pitch Channel Of Hypersonic Vehicle

Hypersonic vehicle has special strategic value in both military and civilian areas, so it has already become a hotspot throughout the world. However, its characteristics such as strong nonlinearity, fast time-varying, hard constraints and large flight envelope will lead a series of difficulties to controller design. How to design a controller to ensure its stable running and efficient tracking control is a key issue during the development of hypersonic vehicle. The application of predictive control algorithm in pitch channel of hypersonic vehicle is studied. The controller design method and simulation are also proposed.Based on the review on modeling method of hypersonic vehicle, the dynamic model of pitch channel is at first discussed to acquire motion equations and aerodynamic characteristics. Based on MATLAB and Flightgear, a visual simulation environment is established, which could lay a foundation for subsequent work on controller design and simulation.Secondly, aiming at cruising flight of hypersonic vehicle, a state-space model based predictive controller is designed. The simulation results show that the application of predictive control in hypersonic vehicle is feasible. Moreover, robust model predictive control method is applied to deal with model uncertainty, which is inevitable in real flight. Later simulation experiments are illustrated to verify the effectiveness of the controller.Considering large envelope flight of hypersonic vehicle, two multi-model switching based predictive control schemes are studied. One is velocity based multi-model predictive control method. Improvement is made on reference trajectory and switching rule to realize efficient large range tracking control of flight velocity. The other is dynamic pressure based multi-model predictive control method. The simulation result shows that it could lead to good performance of large range tracking control of velocity while the altitude changes.