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A decoupling approach to integrated fault-tolerant control for linear systems with unmatched non-differentiable faults

Lan, Jianglin; Patton, Ron J

Authors

Jianglin Lan



Abstract

This paper proposes a decoupling approach to the integrated design of fault estimation (FE) and fault-tolerant control (FTC) for linear systems in the presence of unknown bounded actuator faults and perturbations. An adaptive sliding mode augmented state unknown input observer is developed to estimate the system state, actuator faults and perturbations, based on a descriptor augmentation strategy and the equivalent output injection concept. Subsequently, an adaptive backstepping FTC controller is designed to compensate the effects of the faults and perturbations acting on the system to ensure robust output tracking. In the proposed observer the effects of the control system perturbations are estimated and the fault effects are compensated to ensure that the FE function is decoupled from the FTC system. This leads to satisfaction of the Separation Principle under the framework of integrated design. When compared with the existing H∞ optimization single-step integrated FE/FTC design approach, in this paper the FE/FTC decoupling and the perturbation compensation (in the control) together contribute to a new integrated FTC strategy with more design freedom, less complexity and higher robustness. Moreover, the proposed method is shown to be applicable to a wide class of faults, which can be differentiable or non-differentiable, and matched or unmatched. Comparative simulations of the tracking control of a DC motor are provided to demonstrate the performance effectiveness of the proposed approach.

Journal Article Type Article
Publication Date 2018-03
Journal Automatica : the journal of IFAC, the International Federation of Automatic Control
Print ISSN 0005-1098
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 89
Pages 290-299
APA6 Citation Lan, J., & Patton, R. J. (2018). A decoupling approach to integrated fault-tolerant control for linear systems with unmatched non-differentiable faults. Automatica : the journal of IFAC, the International Federation of Automatic Control, 89, 290-299. https://doi.org/10.1016/j.automatica.2017.12.011
DOI https://doi.org/10.1016/j.automatica.2017.12.011
Keywords Decoupling approach; Integrated fault-tolerant control; Adaptive sliding mode augmented state unknown input observer; Adaptive backstepping control; Unmatched non-differentiable fault
Publisher URL https://www.sciencedirect.com/science/article/pii/S0005109817305885
Related Public URLs http://eprints.whiterose.ac.uk/127122/

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Copyright Statement
©2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/





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