Active-Disturbance-Rejection / Robust Attitude Control System Design of Underactuated Vehicle Based on Flap Control

To solve the problems of insufficient maneuverability and difficulties in engineering applications that are commonly seen in existing underactuated hypersonic vehicle control strategies, an active disturbance rejection / robust control system with new underactuated control strategies is proposed. Firstly, an underactuated control strategy based on channel cascade is presented an important feature is that the yaw channel acts as the inner loop of the roll channel in the new strategy, and the introduction of the ± 1. 5° legal range of sideslip angle also improves the command tracking speed of the roll angle. Then, the control law is constructed by the combination of active disturbance rejection control (ADRC) and robust control theory. It is not only suitable for non-minimum phase systems with overload feedback / underactuation, but also reduces model parameters dependence in ADRC as well as order reduction difficulty in robust control, thus broadening the controller's application in engineering. Finally, 1 000 times Monte Carlo simulations are carried out on the hypersonic vehicle model with ± 20% random perturbation in parameters, and the results show that the proposed strategy can improve the response speed of the roll channel while ensuring the sideslip angle does not cross the boundary. In addition, the control system also has good robustness when confronted with model perturbation and compound interference. © 2023 China Ordnance Society. All rights reserved.