Structural integrity analysis of vibrating composite structures based on optical fiber strain sensing and finite element model updating

Giorgio Nosenzo; Maurice Patrick Whelan; Tara Dalton

doi:10.1117/12.468140

22 May 2002 Structural integrity analysis of vibrating composite structures based on optical fiber strain sensing and finite element model updating

Giorgio Nosenzo, Maurice Patrick Whelan, Tara Dalton

Author Affiliations +

Proceedings Volume 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications; (2002) https://doi.org/10.1117/12.468140
Event: Fifth International Conference on Vibration Measurements by Laser Techniques, 2002, Ancona, Italy

Abstract

This investigation concerns the application of different techniques, including optical fibre strain sensing puIsed Digital Speckle Pattern Interferometry (DSPI), traditional modal analysis and finite element model updating procedures to the study of vibrating composite structures. A prototype system for condition monitoring of composite structures is being developed which relies on the on-line measurement of dynamic strains in order to detect any deterioration in performance due to damage. A range of carbon-fibre reinforced composite specimens that incorporate innovative Fabry-Perot interferometric long gauge-length strain sensors have been produced and tested. The optimal design of fibre sensor network configurations for the identification of different damage parameters is being aided through the development of a software simulation tool and the use of a p-version FEM package. Vibration modes of the excited structures have also been determined using an out-of-plane pulsed-DSPI system, employing a dual-cavity frequencydoubled Nd:YAG pulsed laser with a 25Hz repetition rate. In general, experimental results compare favourably with finite element predictions. The data derived from the strain sensors is used to update a parameterised FE model of the composite structure, allowing the determination of the position and extent of damage present.

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Giorgio Nosenzo, Maurice Patrick Whelan, and Tara Dalton "Structural integrity analysis of vibrating composite structures based on optical fiber strain sensing and finite element model updating", Proc. SPIE 4827, Fifth International Conference on Vibration Measurements by Laser Techniques: Advances and Applications, (22 May 2002); https://doi.org/10.1117/12.468140

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