Title :
Adaptive integral variable structure attitude controller design and application to flexible spacecraft
Author :
Hu, Qinglei ; Sun, Liping ; Hua, Jun
Author_Institution :
Sch. of Electromech. Eng., Northeast Forestry Univ., Harbin
Abstract :
A robust control system for the rotational maneuver of an orbiting spacecraft with flexible appendages is designed. Based on adaptive variable structure control theory, a discontinuous attitude control law is derived to achieve the desired position of the spacecraft, taking explicitly into account external disturbance and nonlinearity. To reconstruct estimates of the system states for use in a full information variable structure control law, an asymptotic variable structure observer is also employed and the fulfillment of sliding condition, including the case when estimated states are used, is also verified. An additional attractive feature of the control system is that an adaptive mechanism is also embedded such that the unknown upper bound of lumped perturbation is automatically adapted. Simulation results have been shown that the developed control scheme guarantees not only the stability of the closed-loop system, but also yields better performance and robustness in the presence of parametric uncertainties and external disturbance.
Keywords :
adaptive control; asymptotic stability; attitude control; closed loop systems; control system synthesis; observers; robust control; space vehicles; state estimation; variable structure systems; adaptive integral variable structure; asymptotic stability; asymptotic variable structure observer; attitude controller design; closed-loop system; discontinuous attitude control law; information variable structure control law; lumped perturbation; robust control system; spacecraft; state estimation; uncertain parameter; Adaptive control; Attitude control; Automatic control; Control systems; Control theory; Programmable control; Robust control; Robust stability; Space vehicles; State estimation; adaptive control; attitude maneuver; flexible spacecraft; integral variable structure control (IVSC);
Conference_Titel :
Intelligent Control and Automation, 2008. WCICA 2008. 7th World Congress on
Conference_Location :
Chongqing
Print_ISBN :
978-1-4244-2113-8
Electronic_ISBN :
978-1-4244-2114-5
DOI :
10.1109/WCICA.2008.4593395