Adrc Attitude Controller Research For Hypersonic Vehicle

Hypersonic vehicle is the focus of recent research in various space powers , but the flight aerodynamic environment is complex and its model uncertainty increases because of its high speed, which makes the design of guidance and control system difficult. The traditional design method of aircraft control system for hypersonic aircraft is no longer applicable and nonlinear control methods must be developed. This article references relevant literature and establishes a unpowered hypersonic reentry vehicle model using the hypersonic vehicle of NASA Langley Research Center and gives out the model of aerodynamic forces and moments. Analyze the coupling characteristics of the open-loop after determining the basic parameters and obtaines the conclusion that the couplings between the three channels serious of hypersonic vehicle, so it can not control the three channels individually. After analyzing various nonlinear control methods, determine the use of ADRC control technology for attitude controller. First, based on the time scale separation theory hypersonic vehicle model is divided into inner and outer loop in order to facilitate controller design. Using the advantages of simple design and clear physical meaning of nonlinear dynamic inversion, improve its robustness by tracking differentiator of ADRC and design ADRC PID controller based on dynamic inversion. Finally analysze by the simulation, simulation results show that there are some design shortcomings.for the controller. Therefore, by the combination of ADRC techniques, use the extended state observer and non-linear error feedback to design a dual-ADRC, the simulation results show that the controller has strong robustness and good dynamic features.