Abstract:

A precise vertical recovery control strategy is designed by using the sliding mode dynamic surface control (SMDSC) technology in the reentry landing phase for a reusable launch vehicle. Firstly, the actual dynamic model of the launch vehicle is established, which includes the fuel consumption, the change of the center of mass and the inertia perturbation. Then, a sliding mode state observer and an adaptive parameter estimator are given to obtain the estimated value of the norm bounded uncertainties and disturbances. Subsequently, a dynamic surface tracking control law is proposed based on the derived estimations. Finally, the numerical simulation is carried out to compare with the attitude tracking ability of the vertical return launch vehicle under two different control strategies. The results show that the proposed adaptive sliding mode dynamic surface control strategy has better tracking performance.

Key words: Launch vehicle, Sliding mode observer, Parameter estimator, Dynamic surface control