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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

doi:10.4203/ccp.106.125

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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..

Summary

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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Front Page Browse CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Proceedings ISSN 1759-3433 CCP: 106 PROCEEDINGS OF THE TWELFTH INTERNATIONAL CONFERENCE ON COMPUTATIONAL STRUCTURES TECHNOLOGY Edited by: 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 doi:10.4203/ccp.106.125 purchase the full-text of this paper 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.. Summary 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. purchase the full-text of this paper (price £20) go to the previous paper go to the next paper return to the table of contents return to the book description purchase this book (price £65 +P&P)
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