Abstract
This paper presents a barrier Lyapunov function based nonsingular fast terminal sliding mode control with fixed-time non-recursive disturbance observer for the blended-wing-body (BWB) aircraft in the presence of mismatched disturbances and output constraints. The fixed-time non-recursive disturbance observer based nonsingular fast terminal sliding mode control is proposed for matched and mismatched disturbances attenuation. Furthermore, in order to pursue high-precision attitude tracking regarded as output tracking errors constraints before disturbance observer tracking errors converge to a small prescribed range, the barrier Lyapunov function is designed to constrain the sliding mode variables before states reach the sliding mode surface. Consequently outputs tracking errors constraints can be satisfied by the sliding variables constraints. More importantly, barrier Lyapunov function based terminal sliding mode controller ensures the finite-time convergence. Finally, the numerical simulations demonstrate the chattering attenuation and high-precision attitude tracking of the BWB aircraft in the presence of mismatched disturbances and output constraints.
Highlights
Recent years have witnessed the extensive researches of Blended-Wing-Body (BWB) aircraft, for its advantages in stealth, aerodynamics, and structural strength
This paper proposes a barrier Lyapunov function based nonsingular fast terminal sliding mode control with fixed-time non-recursive disturbance observer for blendedwing-body aircraft high-precision attitude tracking with mismatched disturbance and output constraints
SIMULATION RESULTS In order to illustrate the effectiveness of the fixed-time nonrecursive disturbance observer (FxTDO) based NFTSMC and barrier Lyapunov function (BLF) based NFTSMC design for the blendedwing-body aircraft attitude tracking, two simulation cases and comparison results will be presented
Summary
Recent years have witnessed the extensive researches of Blended-Wing-Body (BWB) aircraft, for its advantages in stealth, aerodynamics, and structural strength. Z. Chen et al.: Barrier Lyapunov Function-Based SMC for BWB Aircraft With Mismatched Disturbances and Output Constraints only insensitive to the matched disturbance, these methods cannot avoid chattering problem. The disturbance observer based sliding mode control method cannot guarantee high-precision attitude tracking regarded as the output constraints before the disturbance observer tracking errors converge to a small prescribed range. This paper proposes a barrier Lyapunov function based nonsingular fast terminal sliding mode control with fixed-time non-recursive disturbance observer for blendedwing-body aircraft high-precision attitude tracking with mismatched disturbance and output constraints. The main contributions of this paper are stated as follows: 1) A fixed-time non-recursive disturbance observer (FxTDO) based nonsingular fast terminal sliding mode control (NFTSMC) method is established to attenuate matched and mismatched disturbance and recovery its nominal control performance.
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