Robust Predictive Functional Control for Flight Vehicles Based on Nonlinear Disturbance Observer

A novel robust predictive functional control based on nonlinear disturbance observer is investigated in order to address the control system design for flight vehicles with significant uncertainties, external disturbances, and measurement noise. Firstly, the nonlinear longitudinal dynamics of the fli...

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Bibliographic Details
Published in:International journal of aerospace engineering 2015-01, Vol.2015 (2015), p.1-16
Main Authors: Hu, Fan, Jiang, Zhenyu, Yang, Huabo, Zhang, Yinhui, Zhang, Weihua
Format: Article
Language:English
Subjects:
Aerospace engineering
Control systems design
Disturbance observers
Disturbances
Flight vehicles
Mathematical models
Noise measurement
Nonlinear dynamics
Nonlinearity
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Summary:A novel robust predictive functional control based on nonlinear disturbance observer is investigated in order to address the control system design for flight vehicles with significant uncertainties, external disturbances, and measurement noise. Firstly, the nonlinear longitudinal dynamics of the flight vehicle are transformed into linear-like state-space equations with state-dependent coefficient matrices. And then the lumped disturbances are considered in the linear structure predictive model of the predictive functional control to increase the precision of the predictive output and resolve the intractable mismatched disturbance problem. As the lumped disturbances cannot be derived or measured directly, the nonlinear disturbance observer is applied to estimate the lumped disturbances, which are then introduced to the predictive functional control to replace the unknown actual lumped disturbances. Consequently, the robust predictive functional control for the flight vehicle is proposed. Compared with the existing designs, the effectiveness and robustness of the proposed flight control are illustrated and validated in various simulation conditions.
ISSN:1687-5966
1687-5974
DOI:10.1155/2015/878971