The Design Of Gain Scheduling Controller Of Hypersonic Vehicle

Along with the development of economy and high technology, the research of hypersonic vehicle is becoming more and more important to the developed country. Every country is deepening research and Exploration on the hypersonic vehicle. To our country, the national defense and economic development are facing grave pressure and challenges now. From the perspective of protecting our national interests and development,it is necessary and urgent to carry out the research plan on hypersonic vehicle. Due to the hypersonic vehicle itself is a nonlinear model and it has the following characteristics: Structural integration, the speed of flight is fast and the flight environment is complex. So the control problem is one of the important and difficult points in the research of hypersonic vehicle. This paper selects the NASA Langley Laboratory’s Hypersonic vehicle longitudinal model for the controlled object. We do some deeply research on the model and then design a state feedback controller. Then considering actuator saturation problem to design a gain scheduling feedback controller with actuator saturation. When the controller’s design is completed, we use the MATLAB software to complete the simulation.Firstly, We completed the modeling work of aircraft longitudinal model of hypersonic. According to NASA Langley Research Center’s hypersonic vehicle full state model. We obtain the Hypersonic vehicle longitudinal model Through reasonable hypothesis and derivation. Then we focus on the Hypersonic vehicle longitudinal model’s study. We analysis it’s each parameter or variable’s physical meaning and compare with the traditional rigid body model. At the same time, the model is built and verified by using MATLAB software.Secondly, the longitudinal model of hypersonic vehicle is divided into long period mode and short period mode. According to the tracking part, which belong to the long period mode, we transform the model into a LPV model by the linear fractional transformation. Then we make some study on the LPV model in order to prepare for the farther researchThirdly, the linearization of the model is done at a trimmed condition. According to the linearized model we start to research by analyzing the open-loop characteristic and then to design a state feedback controller based on the pole placement method. The results are obtained from the simulation. From the result the stabilization of the model is achieved in theory. Then the controller is applied to the longitudinal model’s control.finally, because of the state feedback control method has some defects, according to the longitudinal model, we consider the actuator saturation problem, based on the gain scheduling control theory, we design a scheduling output feedback controller with actuator saturation. Then make the simulation and stability analysis.