Journal
ADVANCES IN STRUCTURAL ENGINEERING
Volume 22, Issue 7, Pages 1519-1530Publisher
SAGE PUBLICATIONS INC
DOI: 10.1177/1369433218818921
Keywords
end effect; flood discharge structure; normalized central frequency difference spectrum; singular spectrum analysis; variational mode decomposition
Funding
- National Natural Science Foundation of China [51579086, 51739003]
- National Key R&D Program of China [2018YFC1508603]
- Priority Academic Program Development of Jiangsu Higher Education Institutions [YS11001]
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Extraction of the vibration characteristics of a flood discharge structure under the influence of intensive background noise is one of the main challenges in vibration-based damage identification. A novel algorithm called normalized central frequency difference spectrum is proposed to improve the variational mode decomposition algorithm for high-frequency noise filtering. To eliminate the errors caused by end effect, the waveform matching extension algorithm is used to further improve the variational mode decomposition. However, the vibration signal is still coupled in low-frequency noise. Thereupon, the singular spectrum analysis algorithm is applied to filter the low-frequency noise. In this article, a simulated signal and the measured signals from a dam model are analyzed by the proposed algorithm. The results indicate that the proposed algorithm is robust to noise and has high denoising precision. In addition, this algorithm can offer clues for damage identification and localization of a flood discharge structure.
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