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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 106
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Paper 125

Crack Identification and Localization in Beam Structures using Time-Frequency Analysis of Vibro-Acoustic Modulation Responses

A. Trochidis1, L. Hadjileontiadis2 and K. Zaharias3

1Department of Civil Engineering, Aristotle University of Thessaloniki, Greece
2Department of Electrical Engineering, Aristotle University of Thessaloniki, Greece
3Hellenic Institute of Metrology, Greece

Full Bibliographic Reference for this paper
A. Trochidis, L. Hadjileontiadis, K. Zaharias, "Crack Identification and Localization in Beam Structures using Time-Frequency Analysis of Vibro-Acoustic Modulation Responses", in , (Editors), "Proceedings of the Twelfth International Conference on Computational Structures Technology", Civil-Comp Press, Stirlingshire, UK, Paper 125, 2014. doi:10.4203/ccp.106.125
Keywords: crack detection, crack localization, vibro-acoustic modulation, damage index, Zhao-Atlas-Marks distribution, time-frequency analysis..

In this paper a method for damage localization in beam-like structures is presented based on combined low-frequency vibrational excitation and high-frequency ultrasonic excitation resulting in vibro-acoustic modulations. By employing time-frequency analysis on vibro-acoustic modulation responses, based on the Zhao-Atlas-Marks (ZAM) distribution, a new crack location damage index is defined related to the strength of the modulation. The new location damage index is more sensitive and robust compared to the index based on the magnitude of the sidebands. Based on the new location damage index, a method for crack localization in beams was tested. The flexural vibration responses of a cracked beam were measured at different positions along the beam using a series of transducers. The monitored vibro-acoustic modulation responses of the beam were analyzed in the time-frequency domain by using the ZAM distribution and the corresponding location damage indexes were evaluated. The results show that the section of the beam incorporating the crack exhibits the highest ZAM-based location damage index. It follows that the sensitivity of the location damage index defined in the time-frequency domain provides the means for a reliable estimation of the location of a crack.

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