Abstract
A pipe model with a mass ratio (mass/displaced mass) of 4.30 was tested to investigate the vortex-induced vibrations of submarine pipeline spans near the seabed. The pipe model was designed as a bending stiffness-dominated beam. The gap ratios (gap to diameter ratio) at the pipe ends were 4.0, 6.0, and 8.0. The flow velocity was systematically varied in the 0–16.71 nondimensional velocity range based on the first natural frequency. The mode transition between the first and the second mode as the flow velocity increases was investigated. At various transition flow velocities, the research indicates that the peak frequencies with respect to displacement are not identical along the pipe, nor the frequencies associated with the peak of the amplitude spectra for the first four modes as well. The mode transition is associated with a continuous change in the amplitude, but there’s a jump in frequency, and a gradual process along the pipe length.
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Foundation item: Supported by the National Natural Science Foundation of China (No. 41176072), the Scientific Research Fund of Hunan Provincial Education Department (No. 12C0030), the Program for Hu’nan Province Key Laboratory of Water, Sediment Sciences and Flood Hazard Prevention (No. 2012SS07), and the National Natural Science Foundation for Youth of China (No. 51109018).
Yongxue Wang was born in 1955. He is a professor and a PhD advisor at Dalian University of Technology (DUT), China. His primary research interests are the numerical and experimental study on the interaction of ocean dynamic factor with coastal and offshore structures, and the anti-disaster measures on coastal and offshore structures. He got his bachelor’s degree in harbor and waterway engineering, a master’s degree and a PhD in coastal engineering from DUT, respectively. Now he is the director of the Research Institute of Ocean Engineering of DUT.
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Li, X., Wang, Y., Wang, G. et al. Mode transitions in vortex-induced vibrations of a flexible pipe near plane boundary. J. Marine. Sci. Appl. 12, 334–343 (2013). https://doi.org/10.1007/s11804-013-1198-6
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DOI: https://doi.org/10.1007/s11804-013-1198-6