Investigation on the spoiler vibration suppression mechanism of discrete helical strakes of deep-sea riser undergoing vortex-induced vibration
Investigation on the spoiler vibration suppression mechanism of discrete helical strakes of deep-sea riser undergoing vortex-induced vibration
复制标题
涡激振动深海立管离散螺旋板扰流振动抑制机理研究
DOI：
10.1016/j.ijmecsci.2019.105410
复制
发表时间：
2020-04
影响因子：
7.3
通讯作者：
Guo Haiyan
中科院分区：
文献类型：
--
作者：
Li Peng;Liu Lihua;Dong Zhengkai;Wang Fei;Guo Haiyan
涡激振动是引起高展弦比结构在流体作用下疲劳损伤的重要因素。本文设计了一种离散螺旋条振动抑制装置。在波流联合水槽中进行了均匀流动条件下深海隔水管离散螺旋条涡激振动抑制实验。立管模型采用透明柔性有机玻璃管，长2.0 m，外径18 mm，长径比111.11。螺旋条由六面体人造橡胶材料制成。通过改变离散螺旋条的等维离散间距，改变出流速度和螺旋数等水动力参数和结构参数，揭示了阻振装置扰流片的物理机理。探讨了该装置对隔水管涡激振动的抑制效果及对隔水管动力响应的影响。结果表明：离散螺旋条可以将立管后涡向多个方向释放，从多个维度上破坏了涡的空间相关性，改变了原有压力场的分布；离散单螺旋条在锁紧区抑制振动的效率较低，隔水管的主频率与配重裸隔水管相比变化不明显。离散双、三螺旋条的改道次数增加，对来流的扰动增强，在整个速度范围内具有良好的抑振效果。降低了主导频率，显著降低了振动强度，提高了疲劳寿命。随着离散间距的增大，旋涡分离释放率略有增大，但不影响纵向导流角的变化。它仍然可以明显地干扰涡旋的空间相关性，使涡旋分散，保持较高的抑制效率。在等维离散间隔中，主频率、振动抑制效率和疲劳损伤对离散间隔的敏感性较小。
Vortex-induced vibration (VIV) is an important factor that causes fatigue damage of high aspect ratio structures under the action of the fluid. In this paper, a type of discrete helical strakes vibration suppression device was designed. The vortex-induced vibration suppression experiment of the discrete helical strakes of the deep-sea riser under uniform flow in the wave-current combined water flume was carried out. The riser model adopted a transparent flexible plexiglass tube with a length of 2.0 m, an outer diameter of 18 mm and an aspect ratio of 111.11. The helical strakes were made of a hexahedral artificial rubber material. According to varying the equidimensional discrete spacings of the discrete helical strakes, varying the hydrodynamic and structural parameters such as the outflow velocity and the number of helixes, the physical mechanism of spoiler of the vibration suppression device was revealed. The suppression efficiency of the device on the vortex-induced vibration of the riser and the influence on the dynamic response of the riser were explored. The results show that the discrete helical strake can release the vortex behind the riser to multiple directions, destroy the spatial correlation of the vortex from multiple dimensions, and change the distribution of the original pressure field. The discrete single-helical strakes have low vibration suppression efficiency in the lock-in region and the dominant frequency of the riser doesn't change significantly compared with the counterweight bare riser. The number of diversions of the discrete double- and triple-helical strakes increases, and the disturbance to the incoming flow enhances, which makes excellent vibration suppression efficiency in the whole velocity range. And the dominant frequency is reduced, the vibration intensity is significantly reduced and the fatigue life is improved. With the increase of the discrete spacings, the vortex separation release rate increases slightly, but it doesn't affect the change of the diversion angle along the longitudinal direction of the riser. It can still significantly disturb the spatial correlation of the vortex, disperse the vortex and maintain high suppression efficiency. In the equidimensional discrete spacings, the dominant frequency, vibration suppression efficiency and fatigue damage are less sensitive to discrete spacings.
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DOI：
10.1016/j.jweia.2017.02.017
发表时间：
2017-05
影响因子：
4.8
作者：
Yongle Li;Haojun Tang;Qiaoman Lin;Xinzhong Chen
通讯作者：
Yongle Li;Haojun Tang;Qiaoman Lin;Xinzhong Chen
DOI：
10.1109/ibcast.2018.8312209
发表时间：
2018
期刊：
2018 15th International Bhurban Conference on Applied Sciences and Technology (IBCAST)
影响因子：
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通讯作者：
M. Nawaz;Nadeem Shafi;Bilal Amin;B. Ali
影响因子：
4.3
作者：
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通讯作者：
L. K. Quen;A. Abu;N. Kato;P. Muhamad;Asnizah Sahekhaini;Hanida Abdullah
影响因子：
2.5
作者：
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