Composite adaptive disturbance observer-based control for a class of nonlinear systems with multisource disturbance. (English) Zbl 1273.93099

Wei, Xinjiang; Chen, Nan; Li, Wuquan

Int. J. Adapt. Control Signal Process. 27, No. 3, 199-208 (2013).

Summary: Antidisturbance control and estimation problem are introduced for a class of nonlinear system subject to multisource disturbances. The uncertain multisource disturbances consist of not only a single harmonic or constant disturbance but also another unexpected nonlinear signal described as a nonlinear function. The composite adaptive disturbance observers are constructed separately from the controller design to estimate the disturbance with partial known information. By integrating disturbance observer-based controller with robust adaptive control, a novel type of composite adaptive disturbance observer-based control scheme is presented for a class of nonlinear system with multisource disturbances. Simulations for a flight control system are given to demonstrate the effectiveness of the results compared with the previous schemes.

MSC:

93C40	Adaptive control/observation systems
93B07	Observability
93C10	Nonlinear systems in control theory
93C73	Perturbations in control/observation systems
93B35	Sensitivity (robustness)

Keywords:

disturbance observer-based control; multisource disturbances; composite adaptive disturbance observers; flight control system; robust adaptive control; partial known information; single harmonic disturbance

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