Assessment and Localization of Active Discontinuities Using Energy Distribution Between Intrinsic Modes
Name
Assessment and Localization of Active Discontinuities Using Energy Distribution between Intrinsic Modes.pdf
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403.63 KB
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Adobe PDF
Checksum (MD5)
29374a8450ce6c6901718734ac1dff7d
Author(s)
Mohammadi Ghazi Mahalleh, Reza
Buyukozturk, Oral
Date Issued
March 2014
Journal
Structural Health Monitoring
Publisher
Springer
Citation
Ghazi, Reza Mohammadi, and Buyukozturk, Oral. “Assessment and Localization of Active Discontinuities Using Energy Distribution Between Intrinsic Modes.” Structural Health Monitoring, Volume 5, Proceedings of the 32nd IMAC, A Conference and Exposition on Structural Dynamics (March 2014): 1–9 © 2014 The Society for Experimental Mechanics, Inc
Version
Author's final manuscript
Abstract
A method for localization and severity assessment of structural damages is proposed. The algorithm works based on nonlinear behavior of certain type of damages such as breathing cracks which are called active discontinuities in this paper. Generally, nonlinear features are more sensitive to such damages although their extraction is sometimes controversial. A major controversy is the imposition of spurious modes on the expansion of the signal which needs to be addressed for an effective application and robustness of the method. The energy content of Intrinsic Mode Functions (IMFs), which are the resultants of Empirical Mode Decomposition (EMD), and also the shape of energy distribution between these modes before and after damage, are used for localization and severity assessment of the damages. By using EMD, we preserve the nonlinear aspects of the signal while avoiding imposition of spurious harmonics on its expansion without any assumption of stationarity. The developed algorithms are used to localize and assess the damage in a steel cantilever beam. The results show that the method can be used effectively for detecting active structural discontinuities due to damage.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1007/978-3-319-04570-2_1
