Unknown Input Observer-Based Robust Fault Estimation for Systems Corrupted by Partially Decoupled Disturbances

• Published in: IEEE transactions on industrial electronics (1982) Vol. 63; no. 4; pp. 2537 - 2547
• Main Authors: Zhiwei Gao, Xiaoxu Liu, Chen, Michael Z. Q.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.04.2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: augmented system approach; Estimation error; Fault diagnosis; fault estimation; Gas turbine engines; linear matrix inequality; Nonlinear systems; Observers; Robustness; Symmetric matrices; unknown input observer; linear matrix inequality (LMI); fault diagnosis; Augmented system approach; unknown input observer (UIO); fault estimation
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2015.2497201

Robust fault estimation plays an important role in real-time monitoring, diagnosis, and fault-tolerance control. Accordingly, this paper aims to develop an effective fault estimation technique to simultaneously estimate the system states and the concerned faults, while minimizing the influences from process/sensor disturbances. Specifically, an augmented system is constructed by forming an augmented state vector composed of the system states and the concerned faults. Next, an unknown input observer (UIO) is designed for the augmented system by decoupling the partial disturbances and attenuating the disturbances that cannot be decoupled, leading to a simultaneous estimate of the system states and the concerned faults. In order to be close to the practical engineering situations, the process disturbances in this study are assumed not to be completely decoupled. In the first part of this paper, the existence condition of such an UIO is proposed to facilitate the fault estimation for linear systems subjected to process disturbances. In the second part, robust fault estimation techniques are addressed for Lipschitz nonlinear systems subjected to both process and sensor disturbances. The proposed technique is finally illustrated by the simulation studies of a three-shaft gas turbine engine and a single-link flexible joint robot.