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首页> 外文会议>International conference on pipelines and trenchless technology;ICPTT 2011 >The Analysis of Vortex-induced Vibration of Offshore Riser and Pipeline with Unsupported Span in Steady Current
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The Analysis of Vortex-induced Vibration of Offshore Riser and Pipeline with Unsupported Span in Steady Current

机译：静流无支撑跨度的海洋立管和管道涡激振动分析

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摘要

The offshore riser and pipeline with an unsupported span are usually subjected to the vibration due to vortex-shedding. To analyze the vortex-induced vibration of offshore pipelines in steady current, an elastically supported rigid hollow cylinder is used as a calculation model with single freedom. The fluid forces acting on the cylinder are divided into lift and fluid reaction. A simplified method to analyze vortex-induced vibration of cylinder is established. The method transfers the structural vibration differential equation into algebraic equations and the empirical formulae about fluid force coefficient are put forward. The results calculated by above method indicate that the vortex-induced vibration of a cylinder is mainly controlled by reduced velocity. usually, the locking-in phenomenon occurs when the reduced velocity falls between 4.0 and 9.0, and the maximum vibration amplitude occurs when the reduced velocity falls between 6.25 and 7.5. The method presented in this paper is a feasible one to predict the vortex-induced vibration of a cylinder.
机译：跨距无支撑的海上立管和管道通常会由于涡流脱落而遭受振动。为了分析稳定流中海上管道的涡激振动，以弹性支撑的刚性空心圆柱作为单自由度的计算模型。作用在气缸上的流体力分为升力和流体反作用力。建立了一种简化的分析涡流引起的圆柱振动的方法。该方法将结构振动微分方程转换为代数方程，并提出了流体力系数的经验公式。通过上述方法计算得出的结果表明，由涡流引起的气缸振动主要是由降低的速度控制的。通常，当降低的速度在4.0到9.0之间时会发生锁定现象，而当降低的速度在6.25到7.5之间时会出现最大振动幅度。本文提出的方法是一种可行的方法来预测汽缸的涡激振动。

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