Affiliation of Author(s):自动化学院
Journal:NONLINEAR DYNAMICS
Key Words:Fault-tolerant control Sliding mode Hypersonic flight vehicle Fault estimation Fuzzy logic system
Abstract:This study presents a nonlinear fuzzy fault-tolerant control (FTC) and a fault observer for longitudinal dynamics of hypersonic flight vehicle (HFV) with parameter uncertainty and actuator gain loss fault via sliding-mode and backstepping theory. An affine nonlinear dynamic model of HFV with parameter uncertainty and actuator fault is established based on feedback linearization technology. A nominal sliding-mode control is developed to track the command of altitude and velocity. Unknown nonlinear functions in the controller are approximated by fuzzy logic system through updating the weight parameters online. In view of the occurrence of actuator fault, a backstepping sliding-mode observer is constructed to estimate the fault. A nonlinear fuzzy FTC is then designed with the estimate fault obtained from the observer to address the problem of actuator fault and parameter uncertainty. The stability of the controller is analyzed utilizing Lyapunov theory. Numerical simulation results demonstrate the validity and robustness of the proposed controller and observer.
ISSN No.:0924-090X
Translation or Not:no
Date of Publication:2018-05-01
Co-author:Niu, Juan,Tao, Gang
Correspondence Author:Fuyang Chen
Date of Publication:2018-05-01