Design of Adaptive Variable Structure Control System for Aerospace Vehicle

The aerospace vehicle is a hypersonic vehicle for long distance transport in near-space. The control system design is much more complicated than that of conventional aircraft due to its large attitude maneuvers and a large amount of uncertainty in ascent and descent modes. In order to provide accurate guidance and attitude tracking, the controller must be robust to external unknown disturbances, un-modeled dynamics and plant uncertainties and also be able to perform well under a wide range of operating conditions. Sliding mode controller is an attractive robust control algorithm for the ASV flight controller designs because of its inherent insensitivity and robustness to plant uncertainties and external disturbances. The pros of variable structure control is robust, the cons is dither in sliding mode. This article designs the parameters of variable control using self-organized method, which is effective on mitigating the chattering on the sliding mode without losing the speed of self-organizing fuzzy control. The control algorithm is based on discrepancy, needs few information and has fast convergence speed. Also, this article designs switching plane of variable structure control using adaptive pole assignment. So, the three kinds of controlling methods are integrated and get better performance.