1. 固定-铰接约束柔性管的涡激振动实验研究.
- Author
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朱红钧, 刘文丽, and 高 岳
- Subjects
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RISER pipe , *FATIGUE cracks , *OCEAN currents , *FREQUENCIES of oscillating systems , *OPTICAL measurements , *ENERGY transfer - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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