Abstract
This paper investigates the velocity and altitude tracking control problem for air-breathing hypersonic vehicle (AHV) under external disturbances and uncertainties. An improved smooth super-twisting based disturbance observer (SSTDOB) is proposed to estimate the unknown external disturbances. With the assistance of SSTDOB, an effective fixed-time sliding mode backstepping control (FSMBC) is designed to guarantee the tracking errors converge to a small neighbor of the origin. Meanwhile, a fixed-time tracking differentiator (FTD) is employed to estimate the virtual control inputs, which can eliminate the differential explosion problem. The overall stability of the closed-loop system is analyzed by utilizing Lyapunov stability theory. Simulation results demonstrate the effectiveness of the composite method.
Highlights
Air-breathing hypersonic vehicle (AHV) usually flies at more than 5 Mach numbers in the near space region [1]
Motivated by the above analysis, this study proposes a composite controller which consists of smooth super-twisting algorithm based disturbance observer (SSTDOB) and fixedtime sliding mode backstepping control (FSMBC) for AHV
The supertwisting based disturbance observer (SSTDOB) is firstly designed to estimate the disturbances exhibited in AHV, which can effectively enhance the anti-interference performance of control system
Summary
Air-breathing hypersonic vehicle (AHV) usually flies at more than 5 Mach numbers in the near space region [1]. It has attracted tremendous attentions and numbers of researches due to the advantages of global response, strong penetration ability and great potential in military and civilian applications [2]. Compared with the conventional aircrafts, AHV can adopt scramjet engine as its main power and combine it with the body to realize the propulsion-airframe integration configuration [3]. This integration would lead to heavy couplings among the elastic airframe, the propulsion system and the structural dynamics [4]. Stability and robustness are still a focus issue of AHV
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