张力腿平台涡激运动特性的试验研究
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摘要
文章基于物理模型试验,对张力腿平台的涡激运动问题进行了探讨,研究了横向和顺流向涡激运动频率及响应特性。试验结果表明:在锁定区,涡激运动频率与平台在海流中的位置有关。当结构沿流向对称时,顺流向振荡频率是横向振荡频率的两倍;当结构沿流向不对称时,顺流向振荡频率与横向振荡频率相同。试验结果还表明,流向角是影响平台运动轨迹的关键因素,当流向角为0°和45°时,平台运动轨迹呈不规则"8"字形;15°和30°时,运动轨迹为"香蕉形"。
Inline and transverse vortex induced motions(VIM) of tension leg platform(TLP) were studied based on the VIM experiment. The vibration characteristics and frequency relationship of VIM of TLP were also investigated. The results show that the frequency of VIM is related to the location of the structure in the current in lock-in region. When the structure shape is symmetric along inline direction, the frequency of inline vibration is twice of that in transverse. While the structure shape is asymmetric along inline direction, the frequency of inline vibration is equal to that in transverse. The results also reveal that the current incidences is the key factor influencing the motion trace. The moving trace has the irregular ‘8-shaped' track under 0° and 45° incidences, while in 15° and 30° incidences, it has the ‘banana-shaped’.
Inline and transverse vortex induced motions(VIM) of tension leg platform(TLP) were studied based on the VIM experiment. The vibration characteristics and frequency relationship of VIM of TLP were also investigated. The results show that the frequency of VIM is related to the location of the structure in the current in lock-in region. When the structure shape is symmetric along inline direction, the frequency of inline vibration is twice of that in transverse. While the structure shape is asymmetric along inline direction, the frequency of inline vibration is equal to that in transverse. The results also reveal that the current incidences is the key factor influencing the motion trace. The moving trace has the irregular ‘8-shaped' track under 0° and 45° incidences, while in 15° and 30° incidences, it has the ‘banana-shaped’.
引文
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[13]张蕙,杨建民,肖龙飞,屈衍.Truss Spar平台涡激运动拖曳模型试验方法研究[J].中国海洋平台,2012(1):22-27.Zhang Hui,Yang Jianmin,Xiao Longfei,Qu Yan.Experimental method study of vortex induced motions of a truss spar in towing tank[J].China Offshore Platform,2012(1):22-27.
[14]黄维平,刘娟,王爱群.基于实验的圆柱体流固耦合升力谱模型研究[J].工程力学,2012,29(2):192-196.Huang Weiping,Liu Juan,Wang Aiqun.A spectrum model of the lift force on a cylinder with fluid-structure interaction based on experiment[J].Engineering Mechanics,2012,29(2):192-204.
[2]Oakley O H,Constantinides Y,Navarro C,et al.Modeling vortex induced motions of spars in uniform and stratified flows[C].Proceedings of the 24th International Conference on Offshore Mechanics and Arctic Engineering,OMAE 2005-67238.
[3]Liu M,Xiao L,Liang Y,Tao L.Experimental and numerical studies of the pontoon effect on vortex induced motions of deep-draft semi-submersibles[J].Journal of Fluid and Structures,2017,72:59-79.
[4]Chen C R,Chen H C.Simulation of vortex-induced motions of a deep draft semi-submersible in current[J].Ocean Engineering,2016,118:107-116.
[5]Holland V,Tezdogan T,Oguz E.Full-scale CFD investigations of helical strakes as a means of reducing the vortex induced forces on a semi-submersible[J].Ocean Engineering,2017,137:338-351.
[6]Seung J K,Dusan S,Ricardo M.Numerical simulation of vortex induced motion of a deep-draft paired-column semi-submersible offshore platform[J].Ocean Engineering,2018,149:291-304.
[7]Khalak A,Williamson C H K.Motions,forces and mode transitions in vortex-induced vibrations at low mass-damping[J].Journal of Fluids and Structures,1999,13(7):813-851.
[8]Waals O J,Phadke A C,Bultema S.Flow induced motions of multi column floaters[C].Proceedings of the 26th International Conference on Offshore Mechanics and Arctic Engineering,OMAE,2007-29539.
[9]Kim Jang-Whan,Magee A,Guan K Y H.CFD simulation of flow-induced motions of a multi-column floating platform[C].Proceedings of the 30th International Conference on Offshore Mechanics and Arctic Engineering,OMAE,2011-49437.
[10]Abrishamchi A,Younis B A.LES and URANS predictions of the hydrodynamic loads on a tension-leg platform[J].Journal of Fluids and Structures,2012,28:244-262.
[11]Tan J H C,Teng Y J,Magee A,et al.Vortex induced motion of TLP with consideration of appurtenances[C].Proceedings of the 33th International Conference on Offshore Mechanics and Arctic Engineering,OMAE,2014-23420.
[12]白治宁,肖龙飞,程正顺,赖智萌.深吃水半潜式平台涡激运动响应模型实验研究[J].船舶力学,2014,18(4):377-384.Bai Zhining,Xiao Longfei,Cheng Zhengshun,Lai Zhimeng.Experimental study on vortex induced motion response of a deep draft semi-submersible platform[J].Journal of Ship Mechanics,2014,18(4):377-384.
[13]张蕙,杨建民,肖龙飞,屈衍.Truss Spar平台涡激运动拖曳模型试验方法研究[J].中国海洋平台,2012(1):22-27.Zhang Hui,Yang Jianmin,Xiao Longfei,Qu Yan.Experimental method study of vortex induced motions of a truss spar in towing tank[J].China Offshore Platform,2012(1):22-27.
[14]黄维平,刘娟,王爱群.基于实验的圆柱体流固耦合升力谱模型研究[J].工程力学,2012,29(2):192-196.Huang Weiping,Liu Juan,Wang Aiqun.A spectrum model of the lift force on a cylinder with fluid-structure interaction based on experiment[J].Engineering Mechanics,2012,29(2):192-204.