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Technical Briefs

Robust Unknown Input Observer for Nonlinear Systems and Its Application to Fault Detection and Isolation

[+] Author and Article Information
S. Mondal1

Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur-721302, West Bengal, Indiasharifm123@gmail.com

G. Chakraborty

Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur-721302, West Bengal, Indiagoutam@mech.iitkgp.ernet.in

K. Bhattacharyya

Department of Mechanical Engineering, Indian Institute of Technology, Kharagpur-721302, West Bengal, Indiaking@mech.iitkgp.ernet.in

1

Corresponding author.

J. Dyn. Sys., Meas., Control 130(4), 044503 (Jun 09, 2008) (5 pages) doi:10.1115/1.2936857 History: Received January 29, 2007; Revised January 09, 2008; Published June 09, 2008

A robust unknown input observer for a nonlinear system whose nonlinear function satisfies the Lipschitz condition is designed based on linear matrix inequality approach. Both noise and uncertainties are taken into account in deriving the observer. A component fault detection and isolation scheme based on these observers is proposed. The effectiveness of the observer and the fault diagnosis scheme is shown by applying them for component fault diagnosis of an electrohydraulic actuator.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Components of the residual r(1)(t)

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Figure 2

Components of the residual r(2)(t)

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Figure 3

Estimated stiffness (K̂1)

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Figure 4

Estimated damping coefficient (Ĉ1)

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