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1 April 2010 Application of nonlinear observers in hysteretic model updating
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Identification of the changes in the properties of a structure are a potential indication of damage in that structure. In nonlinear systems, hysteretic models are often used to represent structural deterioration as well. Thus, the updating of such nonlinear hysteretic models using measured responses from a monitoring system is one approach to identify structural properties and thus damage. Nonlinear observer theory provides the tools to update such models, potentially online and in real-time. This paper examines several nonlinear observers that can be applied as online hysteretic model updating tools, and compares the results by using a Bouc-Wen model updating case. The online updating feature also demonstrates the potential application in providing state feedback to nonlinear structural control.
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Wei Song and Shirley J. Dyke "Application of nonlinear observers in hysteretic model updating", Proc. SPIE 7647, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2010, 764732 (1 April 2010);

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