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

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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\textit{X. Wei} et al., Int. J. Adapt. Control Signal Process. 27, No. 3, 199--208 (2013; Zbl 1273.93099)

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