Hilbert transform and spectral kurtosis based approach in identifying the health state of retrofitted old steel truss bridge
ISSN: 1708-5284
Article publication date: 24 June 2021
Issue publication date: 20 June 2022
Abstract
Purpose
This study aims to include the diagnosis of an old concrete deck steel truss rural road bridge in the damaged and retrofitted state through vibration response signals.
Design/methodology/approach
The analysis of the vibration response signals is performed in time and time-frequency domains using statistical features-root mean square, impulse factor, crest factor, kurtosis, peak2peak and Stockwell transform. The proposed methodology uses the Hilbert transform in combination with spectral kurtosis and bandpass filtering technique for obtaining robust outcomes of modal frequencies.
Findings
The absence or low amplitude of considered mode shape frequencies is observed both before and after retrofitting of bridge indicates the deficient nodes. The kurtosis feature among all statistical approaches is able to reflect significant variation in the amplitude of different nodes of the bridge. The Stockwell transform showed better resolution of present modal frequencies but due to the yield of additional frequency peaks in the vicinity of the first three analytical modal frequencies no decisive conclusions are achieved. The methodology shows promising outcomes in eliminating noise and visualizing distinct modal frequencies of a steel truss bridge.
Social implications
The findings of the present study help in analyzing noisy vibration signals obtained from various structures (civil or mechanical) and determine vulnerable locations of the structure using mode shape frequencies.
Originality/value
The literature review gave an insight into few experimental investigations related to the combined application of Hilbert transform with spectral kurtosis and bandpass filtering technique in determining mode frequencies of a steel truss bridge.
Keywords
Acknowledgements
Funding: The authors declare that the present study is not funded by any source.
Conflict of interest: The authors declare that there is no conflict of interest in the context of the publication of this manuscript. In addition, authors have carefully observed the ethical issues of plagiarism, misconduct, data falsification or any misconduct while developing the article.
Citation
Sharma, A., Kumar, P., Vinayak, H.K., Walia, S.K. and Patel, R.K. (2022), "Hilbert transform and spectral kurtosis based approach in identifying the health state of retrofitted old steel truss bridge", World Journal of Engineering, Vol. 19 No. 4, pp. 491-509. https://doi.org/10.1108/WJE-08-2020-0375
Publisher
:Emerald Publishing Limited
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