Abstract
The in-line (IL) vortex-induced vibration (VIV) that occurs frequently in ocean engineering may cause severe fatigue damage in slender marine structures. To the best knowledge of the authors, in existing literatures, there is no efficient analytical model for predicting pure IL VIV. In this paper, a wake oscillator model capable of analyzing the IL VIV of slender marine structures has been developed. Two different kinds of van der Pol equations are used to describe the near wake dynamics related to the fluctuating nature of symmetric vortex shedding in the first excitation region and alternate vortex shedding in the second one. Some comparisons are carried out between the present model results and experimental data. It is found that many phenomena observed in experiments could be reproduced by the present wake oscillator model.
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The project was supported by the Specialized Research Fund for the Doctoral Program of Higher Education of China (SRFDP) (20100032120047), the Independent Innovation Fund of Tianjin University (2010XJ-0098), State Key Laboratory of Ocean Engineering (Shanghai Jiao Tong University) (1104), the National High Technology Research and Development Program of China (863 Program) (2012AA051705) and the National Natural Science Foundation of China (51209161).
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Xu, WH., Gao, XF. & Du, J. The prediction on in-line vortex-induced vibration of slender marine structures. Acta Mech Sin 28, 1303–1308 (2012). https://doi.org/10.1007/s10409-012-0098-3
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DOI: https://doi.org/10.1007/s10409-012-0098-3