Title: Unknown input nonlinear observer for component fault detection and isolation of dynamic systems

Authors: S. Mondal, G. Chakraborty, K. Bhattacharyya

Addresses: Systems and Dynamics Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India. ' Systems and Dynamics Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India. ' Systems and Dynamics Laboratory, Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India

Abstract: A full order unknown input nonlinear observer is presented. The observer is designed for nonlinear systems whose nonlinear function satisfies Lipschitz condition. A component Fault Detection and Isolation (FDI) scheme is then devised using this observer. The FDI algorithm consists of two steps. In Step 1, the detection of fault and the partial isolation of fault are performed. In Step 2, the total isolation of fault is completed. The FDI scheme is used to detect and isolate fault in a mechanical system.

Keywords: unknown input nonlinear observers; Lipschitz nonlinear system; Luenberger observer; Lyapunov function; component faults; fault detection; fault isolation; parameter isolation; control theory; dynamic systems.

DOI: 10.1504/IJAAC.2009.025239

International Journal of Automation and Control, 2009 Vol.3 No.2/3, pp.154 - 170

Available online: 17 May 2009 *

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