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首页> 外文期刊>Applied Ocean Research >Effect of traveling wave on the vortex-induced vibration of a long flexible pipe
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Effect of traveling wave on the vortex-induced vibration of a long flexible pipe

机译：行波对长柔性管涡流振动的影响

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It is expected that the vortex-induced vibration response of long flexible tubular structures exposed to a shear current will consist of multiple modes of standing and traveling waves simultaneously. The vibration characteristics of traveling wave caused by VIV and its effect on the vibration form for a flexible pipe model are presented in this paper. Two methods are proposed to reveal the characteristics of standing and traveling waves from the perspective of an instantaneous illustration and a time-averaged statistical analysis separately. The first is associated with the adoption of an illustration method depending upon an instantaneous local upper envelope to identify the dominance of the standing or traveling wave. It is found that the in-line and cross-flow wave types show synchronization in that the wave types are mostly changeless or occasionally transform from one type to the other nearly simultaneously. In both the in-line and cross-flow directions, it is evident that the vibration response is not dominated by the standing wave characteristics but can often be characterized by the alternate presence of a traveling wave and a hybrid standing-traveling wave. The second method is associated with the adoption of the significant strain peak concept proposed to estimate the occurrence of the peak strain response and fatigue damage risk. It is found that the strain peak value attributed to in-line static strain accounts for a large proportion of the final equivalent significant strain peak near the pipe end with high reduced velocities, especially when the flow velocity is high. With the occurrence of a hybrid pattern of standing-traveling wave for higher velocities, the distribution of the significant cross-flow strain peak becomes uniform and its corresponding wave shape is apt to be flat.
机译：预期，暴露于剪切电流的长柔性管状结构的涡旋诱导的振动响应将由同时站立和行驶波的多种模式组成。本文介绍了VIV引起的行波振动特性及其对柔性管模型的振动形式的影响。提出了两种方法来揭示从瞬时插图的角度和分别平均统计分析的角度展示和行驶波的特征。第一个与采用图示方法相关联，这取决于瞬时局部上部外壳以识别站立或行驶波的主导地位。结果发现，在线和横流波形类型显示同步，因为波形类型大多是不变的，或者偶尔从一种类型转换到几乎同时转换。在线和横流方向上，显然，振动响应不是由驻波特征的主导，而是通常可以通过行进波和混合行驶波的替代存在来表征。第二种方法与采用显着的应变峰概念相关联，提出估计峰应变响应和疲劳损伤风险的发生。发现归因于在线静态应变的应变峰值占在管端附近的最终等效显着应变峰的大量比例，速度高，速度高，特别是当流速高。随着用于更高速度的驻斗延伸波的混合模式的发生，显着的横流应变峰的分布变得均匀，并且其相应的波形易于平坦。

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