Output-based disturbance rejection control for non-linear uncertain systems with unknown frequency disturbances using an observer backstepping approach
journal contributionposted on 12.07.2016, 08:58 by Jun Yang, Zhengtao Ding, Wen-Hua ChenWen-Hua Chen, Shihua Li
This study is concerned with the output feedback control design for a class of non-linear uncertain systems subject to multiple sources of disturbances including model uncertainties, unknown constant disturbances, harmonic disturbances with unknown frequency and amplitude. The total disturbances and uncertainties are delicately represented by a compact exogenous model first. By incorporating the adaptive internal model principle, a set of dynamic estimators are developed for both state and disturbance observations. By means of observer backstepping technique, a composite output feedback controller is constructed based on the disturbance and state estimations. The stability of the closedloop system is rigorously established based on Lyapunov stability criterion. A missile roll stabilisation example is finally investigated to validate the effectiveness of the proposed control approach.
The work was supported in part by the National Natural Science Foundation of China under Grants 61203011,61473080, 61403227 and 61573099, the Natural Science Foundation of Jiangsu Province under Grants BK2012327 and BK20130018, the Chinese Postdoctorial Science Foundation under Grants 2013M540406 and 2014T70455, and also the Fundamental Research Funds for the Central Universities.
- Aeronautical, Automotive, Chemical and Materials Engineering
- Aeronautical and Automotive Engineering