Investigation of a new vortex-induced vibration suppression device in laboratory experiments |
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| Authors: | Yongbo Zhang Haiyan Guo Xiaochun Liu Xiaomin Li |
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| Institution: | ZHANG Yongbo1), 2), GUO Haiyan1), *, LIU Xiaochun1), and LI Xiaomin1) 1) College of Engineering, Ocean University of China, Qingdao 266100, P. R. China 2) National Oceanographic Center, Qingdao 266071, P. R. China |
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| Abstract: | In order to mitigate vortex-induced vibration (VIV) of marine risers, especially to eliminate the phenomenon of frequency
slock-in’, a new suppression device of crescent-shaped flow spoiler was designed with seven different layout schemes. VIV
model tests with six flow levels were conducted in a large wind-wave-current flume. In all cases, vibration responses in both
in-line and cross-flow cases were measured. With the installation of suppression devices vibration frequency evolution of
a riser was analyzed by Morlet wavelet transform. The principle of VIV suppression was interpreted through vibration characteristics.
Fatigue life of the riser was calculated by the Palmgren-Miner rule. Compared with a bare riser, vibration of an outfitted
riser with suppression devices disturbed the steady flow, the vibration amplitudes in the two flow directions were reduced,
and the riser fatigue life was improved. |
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| Keywords: | vortex-induced vibration (VIV) suppression vibration wavelet transform fatigue life |
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