Nonlinear Vibrations of an Extensible Flexible Marine Riser Carrying a Pulsatile Flow
Nonlinear Vibrations of an Extensible Flexible Marine Riser Carrying a Pulsatile Flow
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承载脉动流的可伸缩柔性海洋立管的非线性振动
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
S. Chucheepsakul
中科院分区：
文献类型：
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作者：
T. Monprapussorn;Chainarong Athisakul;S. Chucheepsakul
研究了输运流体对海洋平台静、动态特性的影响。输送流体的内部流动可以具有恒定的、线性的或波速度。立管可能会经历高延伸性、柔性和大位移的条件。因此，立管的数学模型应遵循可伸长柔性输流管道的大应变公式。由于海洋波管相互作用的非线性流体动力阻尼牵连的立管振动，其数值解是由状态空间有限元法确定的高度的非线性。结果表明，内流的冲击加速度会使立管的振动平衡位置发生严重偏移。脉动流的脉动相对地引起立管振动幅值的扩大和频率的降低。内流脉动频率在波动方面可以改革输送管的振荡行为。
The influence of transported fluid on static and dynamic behaviors of marine risers is investigated. The internal flow of the transported fluid could have a constant, a linear, or a wave velocity. The riser pipe may possibly experience the conditions of high extensibility, flexibility, and large displacements. Accordingly, the mathematical riser models should be governed by the large strain formulations of extensible flexible pipes transporting fluid. Nonlinear hydrodynamic dampings due to ocean wave-pipe interactions implicate the high degree of nonlinearity in the riser vibrations, for which numerical solutions are determined by the state-space-finite-element method. It is revealed that the impulsive acceleration of internal flow could seriously relocate the vibrational equilibrium positions of the riser pipe. The fluctuation of the pulsatile flow relatively introduces the expansion of amplitudes and the reduction of frequencies of the riser vibrations. The pulsatile frequencies of the internal flow in wave aspect could reform the oscillation behavior of the conveyor pipe.