1. Attitude tracking control for variable structure near space vehicles based on switched nonlinear systems
- Author
-
Chang-sheng Jiang, Qingxian Wu, and Yufei Wang
- Subjects
Engineering ,Variable structure control ,Switched nonlinear systems ,Adaptive control ,business.industry ,Variable structure near space vehicle ,Mechanical Engineering ,Robust control ,Aerospace Engineering ,Control engineering ,Attitude control ,Fuzzy control system ,Fuzzy control ,Sliding mode control ,Variable structure system ,Control theory ,Robustness (computer science) ,business - Abstract
An adaptive robust attitude tracking control law based on switched nonlinear systems is presented for a variable structure near space vehicle (VSNSV) in the presence of uncertainties and disturbances. The adaptive fuzzy systems are employed for approximating unknown functions in the flight dynamic model and their parameters are updated online. To improve the flight robust performance, robust controllers with adaptive gains are designed to compensate for the approximation errors and thus they have less design conservation. Moreover, a systematic procedure is developed for the synthesis of adaptive fuzzy dynamic surface control (DSC) approach. According to the common Lyapunov function theory, it is proved that all signals of the closed-loop system are uniformly ultimately bounded by the continuous controller. The simulation results demonstrate the effectiveness and robustness of the proposed control scheme.
- Published
- 2013