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Adaptive Observer-Based Fault Estimate for Nonlinear Systems(PDF)

Transactions of Tianjin University[ISSN:1006-4982/CN:12-1248/T]

Issue:
2006年06期
Page:
425-428
Publishing date:

Info

Title:
Adaptive Observer-Based Fault Estimate for Nonlinear Systems
Author(s):
ZONG Qun LIU Wenjing LIU Li
School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China
Keywords:
DOI:

Abstract:
An approach for adaptive observer-based fault estimate for nonlinear system is proposed.H-infinity theory is applied to analyzing the design method and stable conditions of the adaptive observer, from which both system state and fault can be estimated. It is proved that the fault estimate error is related to the given H-infinity track performance indexes,as well as to the changing rate of the fault and the Lipschitz constant of the nonlinear item.The design steps of the adaptive observer are proposed.The simulation results show that the observer has good performance for fault estimate even when the system includes nonlinear terms, which confirms the effectiveness of the method.

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Last Update: 2011-05-03