Finite-time Control for the Hypersonic Morphing Flight Vehicle With FTESO

To address the large uncertainty issues caused by large parameters perturbation, difficult modeling of the deformation process, and complex external disturbances for the hypersonic morphing flight vehicle attitude control, a class of variable back-swept vehicle models are established and a finite-time attitude control scheme with FTESO is designed. Firstly, the three-DOF models with deformations for attitude control are developed, which can reflect the intrinsic effects of the morphing process. Secondly, the aerodynamic properties of the morphing vehicle under some typical states are analyzed, and a feasible way to handle the key aerodynamic data of continuous deformation is presented. Furthermore, a finite-time control scheme based on sliding-mode method is designed for the continuously deformable hypersonic morphing flight vehicle. Additionally, considering the command differentiation terms are necessary for the control law, the command convergence filter is introduced. Then, the finite-time extended state observer is used to estimate the “combined disturbances”. Finally, numerical simulations along with three circumstances verify the efficiency and robustness of the proposed control scheme.