Journal
ISA TRANSACTIONS
Volume 88, Issue -, Pages 233-245Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.isatra.2018.12.013
Keywords
Backstepping control; Fixed-time control; Hypersonic vehicle; Disturbance observer
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Funding
- National Natural Science Foundation of China [11202024]
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This paper proposes a fixed-time backstepping control scheme based on fixed-time disturbance observer for flexible air-breathing hypersonic vehicles. The backstepping control is combined with the fixed-time control technique to achieve fixed-time convergence. A fixed-time super-twisting disturbance observer, which is convergent independently of initial conditions, is employed to estimate and compensate the uncertainties and flexible effects in tracking process. A nonlinear first-order filter is adopted to avoid the explosion of complexity problem that arises in traditional backstepping, and to guarantee overall fixed-time stability. The closed-loop system is proven to be semi-globally uniformly ultimately fixed-time bounded via Lyapunov analysis. Simulation results are given to demonstrate the effectiveness of the proposed scheme. (C) 2018 ISA. Published by Elsevier Ltd. All rights reserved.
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