Experimental Study on the Vortex-Induced Vibration of Fixed-Hinged Flexible Risers

ZHU Hongjun; LIU Wenli; GAO Yue

doi:10.21656/1000-0887.430320

Volume 44 Issue 2

Feb. 2023

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Article Navigation > Applied Mathematics and Mechanics > 2023 > 44(2): 141-151

ZHU Hongjun, LIU Wenli, GAO Yue. Experimental Study on the Vortex-Induced Vibration of Fixed-Hinged Flexible Risers[J]. Applied Mathematics and Mechanics, 2023, 44(2): 141-151. doi: 10.21656/1000-0887.430320

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Experimental Study on the Vortex-Induced Vibration of Fixed-Hinged Flexible Risers

doi: 10.21656/1000-0887.430320

ZHU Hongjun^{1, 2
,
,},
LIU Wenli¹,
GAO Yue¹

1.
Petroleum Engineering School, Southwest Petroleum University, Chengdu 610500, P.R.China
2.
State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, P.R.China

Received Date: 2022-10-11
Rev Recd Date: 2023-01-03

Available Online: 2023-02-03

Publish Date: 2023-02-15

Abstract

Abstract

The top ends of marine risers are usually hinged under the floating platform, and the vortex-induced vibration due to ocean currents often leads to the potential fatigue damage. The non-intrusive optical measurement (high-speed camera) was employed to monitor the displacements of top-hinged-and-bottom-fixed flexible risers arranged in a circulating water flume. The experimental results indicate that, both the mode order of the riser excited in 3 directions and the dominant frequency increase gradually with the reduced velocity. The maximum out-of-plane root-mean-square vibration amplitude has a first downward and then upward trend in the mode transition cases. The spatial distribution of energy transfer between the fluid and the riser varies with the direction, resulting in the asynchronous mode transition. One of the in-plane vibration frequency coincides with the out-of-plane dominant one, which, if dominating the in-plane response, will make a strong coupling mode, or else a weak coupling mode.
- flexible riser,
- response interaction,
- mode competition,
- traveling wave characteristic

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References(36)

References

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