Composite Practically Fixed Time Controller Design for a Hypersonic Vehicle With Multisource Uncertainty and Actuator Fault

• Published in: IEEE transactions on aerospace and electronic systems Vol. 57; no. 6; pp. 4375 - 4389
• Main Authors: Wang, Fang, Li, Yaping, Zhou, Chao, Zong, Qun, Hua, Changchun
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.12.2021; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Actuators; Aerodynamics; Altitude; Atmospheric modeling; Control systems design; Controllers; Disturbance observers; Fast fixed time filter (FFTF); fixed-time disturbance observer (FTDO); hypersonic vehicle (HSV); Hypersonic vehicles; Mathematical model; nonsingular fast terminal sliding mode controller; practically fixed time control; Sliding mode control; Stability; Stability analysis; Subsystems; Tracking control; Tracking errors; Uncertainty; Vehicle dynamics
• ISSN: 0018-9251; 1557-9603
• DOI: 10.1109/TAES.2021.3103237

This article addresses the tracking control problem of a hypersonic vehicle subject to multisource uncertainty and actuator fault. A composite fixed time control scheme is designed to achieve the stable tracking of velocity and altitude in fixed time. A nonsingular fast terminal sliding mode controller and a practically fixed-time backstepping controller are, respectively, developed for velocity subsystem and altitude subsystem. Fixed-time disturbance observer is used to tackle lumped uncertainties and a new fast fixed time filter is constructed to avoid the “explosion of terms” problem. Then, the fixed-time stability of velocity tracking error and the practically fixed-time stability of altitude tracking error are proved. Finally, compared simulations are carried out to present the efficiency of the designed control scheme.