%0 Journal Article
%T Robust nonlinear H¡Þ output
%A Chunqing Huang
%A Huihui Bai
%A Jianping Zeng
%J Transactions of the Institute of Measurement and Control
%@ 1477-0369
%D 2019
%R 10.1177/0142331218794378
%X This paper presents a robust nonlinear H¡Þ output-feedback control approach for attitude manoeuvring of flexible spacecraft with external disturbances, inertia matrix perturbation and input constraints. By applying Lyapunov stability theory and using the generalized S-procedure and sum of squares (SOS) techniques, the robust H¡Þ output-feedback attitude control problem is converted into a convex optimization problem with SOS constraints when the flexible spacecraft is modelled as a polynomial state-space equation with polytope uncertainties. As a result, it overcomes the difficulty in constructing Lyapunov function and implementing numerical computation caused by the non-convexity of output-feedback H¡Þ control design for nonlinear systems. Moreover, it enables the state-observer and the controller to be designed independently and hence the complexity of the control algorithm is reduced remarkably. A numerical example illustrates the effectiveness and feasibility of the proposed approach
%K Flexible spacecraft
%K attitude manoeuvring
%K output-feedback
%K nonlinear H¡Þ control
%K sum of squares
%U https://journals.sagepub.com/doi/full/10.1177/0142331218794378