High-sensitivity damage detection based on enhanced nonlinear dynamics

Bogdan I. Epureanu; Shih-Hsun Yin; Mark M. Derriso

doi:10.1117/12.539592

29 July 2004 High-sensitivity damage detection based on enhanced nonlinear dynamics

Bogdan I. Epureanu, Shih-Hsun Yin, Mark M. Derriso

Proceedings Volume 5391, Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems; (2004) https://doi.org/10.1117/12.539592
Event: Smart Structures and Materials, 2004, San Diego, CA, United States

Abstract

One of the most important aspects of detecting damage in the work-frame of structural health monitoring is increasing the sensitivity of the monitored feature to the presence, location, and extent of damage. Distinct from previous techniques of obtaining information about the monitored structure - such as measuring frequency response functions - the approach proposed herein is based on an active interrogation of the system. This interrogation approach allows for the embedding of the monitored system within a larger system by means of a nonlinear feedback excitation. The dynamics of the larger system is then analyzed in state space, and the shape of the attractor of its dynamics is used as a complex geometric feature which is very sensitive to damage. The proposed approach is implemented for monitoring the structural integrity of a panel forced by transverse loads and undergoing limit cycle oscillations and chaos. The nonlinear von Karman plate theory is used to obtain a model for the panel combined with a nonlinear feedback excitation. The presence of damage is modeled as a loss of stiffness in a portion of the plate. The sensitivity of the proposed approach to parametric changes is shown to be an effective tool in detecting damages.

Citation Download Citation

Bogdan I. Epureanu, Shih-Hsun Yin, and Mark M. Derriso "High-sensitivity damage detection based on enhanced nonlinear dynamics", Proc. SPIE 5391, Smart Structures and Materials 2004: Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems, (29 July 2004); https://doi.org/10.1117/12.539592

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