New results in disturbance decoupled fault reconstruction in linear uncertain systems using two sliding mode observers in cascade

• Published in: International journal of control, automation, and systems Vol. 8; no. 3; pp. 506 - 518
• Main Authors: Ng, Kok Yew, Tan, Chee Pin, Man, Zhihong, Akmeliawati, Rini
• Format: Journal Article
• Language: English
• Published: Heidelberg Institute of Control, Robotics and Systems and The Korean Institute of Electrical Engineers 01.06.2010; Springer Nature B.V; 제어·로봇·시스템학회
• Subjects: Cascades; Control; Diagnosis; Disturbances; Engineering; Faults; Mathematical analysis; Mechatronics; Non-linear Residual Generators; Observers; Reconstruction; Regular Papers; Robotics; Simulation; Sliding mode; 제어계측공학; robustness; fault reconstruction; sliding mode observer; Disturbance decoupling
• ISSN: 1598-6446; 2005-4092; 2005-4092
• DOI: 10.1007/s12555-010-0303-8

This paper presents a disturbance decoupled fault reconstruction (DDFR) scheme using two sliding mode observers in cascade. Measurable signals from the first observer are found to be the output of a fictitious system that is driven by the fault and disturbances. Then the signals are fed into a second observer which will reconstruct the fault. Sufficient conditions which guarantee DDFR are investigated and presented in terms of the original system matrices, and they are found to be less conservative than if only one single observer is used; therefore DDFR can be achieved for a wider class of systems using two sliding mode observers. A simulation example validates the claims made in this paper.