Modal analysis of a cantilever beam by use of the slope-assisted BOTDA method for damage identification

A. Minardo; A. Coscetta; S. Pirozzi; R. Bernini; L. Zeni

doi:10.1117/12.2025992

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20 May 2013 Modal analysis of a cantilever beam by use of the slope-assisted BOTDA method for damage identification

A. Minardo, A. Coscetta, S. Pirozzi, R. Bernini, L. Zeni

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Proceedings Volume 8794, Fifth European Workshop on Optical Fibre Sensors; 87943D (2013) https://doi.org/10.1117/12.2025992
Event: Fifth European Workshop on Optical Fibre Sensors, 2013, Krakow, Poland

Abstract

We report an experimental study on a cantilever beam, aimed to verify the feasibility of modal analysis by distributed Brillouin sensing for structural damage identification. Damage identification was carried out for three defect cases, analyzing the changes of the natural frequencies and mode shapes of the first two bending modes. Comparison with finite element method (FEM) analysis shows that the damage can be detected and localized, within the limitation dictated by the spatial resolution (30 cm) of our sensor.

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A. Minardo, A. Coscetta, S. Pirozzi, R. Bernini, and L. Zeni "Modal analysis of a cantilever beam by use of the slope-assisted BOTDA method for damage identification", Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87943D (20 May 2013); https://doi.org/10.1117/12.2025992

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