Title :
Adaptive fuzzy mixed H2/H∞ attitude control of spacecraft
Author :
Chen, Bor-Sen ; Wu, Charng-Shi ; Jan, Ying-Wen
Author_Institution :
Dept. of Electr. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
fDate :
10/1/2000 12:00:00 AM
Abstract :
This paper presents an adaptive fuzzy mixed H2/H∞ attitude control of nonlinear spacecraft systems with unknown or uncertain inertia matrix and external disturbances. Using an adaptive fuzzy approximation method, an uncertain nonlinear model is estimated. Then, by a mixed H2 and H∞ attitude control design, the effect of external disturbance and fuzzy approximation error on spacecraft attitude can be restrained and the tracking error as well as consumed energy of the controller is minimized. By virtue of the skew symmetric property of the spacecraft system and adequate choice of state variable transformation, this adaptive fuzzy control problem can be reduced to solving two algebraic equations instead of a pair of coupled time-varying differential equations. Finally, experimental simulation results are presented to demonstrate the effectiveness of the proposed design methods.
Keywords :
H∞ control; adaptive control; attitude control; control system synthesis; fuzzy control; inference mechanisms; robust control; self-adjusting systems; space vehicles; state-space methods; uncertain systems; Cholesky factorization; adaptive fuzzy approximation method; adaptive fuzzy control; algebraic equations; consumed energy; design method; external disturbances; inference engine; mixed H2/H∞ attitude control; nonlinear spacecraft systems; robust control; self-tuning system; skew symmetric property; state variable transformation; tracking error; uncertain inertia matrix; uncertain nonlinear model; weighting matrix; Adaptive control; Approximation error; Approximation methods; Attitude control; Differential algebraic equations; Error correction; Fuzzy control; Fuzzy systems; Programmable control; Space vehicles;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
