浪流共同作用下隔水管涡激动力响应分析

Vortex-induced vibration and dynamic response of marine risers

隔水管是海洋浮式生产系统中的重要附属设备.为了探讨在波浪海流共同作用下隔水管的动力响应及进行涡激振动分析,文中给出了三维空间中隔水管运动的控制方程,其中以Matteoluca改进的Vanderpol尾流振子模型为基础计算涡激振动时隔水管与流体之间的相互作用.利用Hermite插值函数对隔水管的运动方程进行有限元离散,采用Newmark方法求解隔水管的动力响应.同时绘出了不同外界条件下相应的位移分布的包络线以及横向涡激振动响应曲线.计算结果表明,所采用的方法正确、有效,可以为隔水管的生产设计及理论分析提供依据.

Marine risers are important components of an offshore floating production system. This paper presents an investigation into the dynamic response of a marine riser subjected to waves and oceanic currents in 3-D space. The governing equation of a marine riser is given, where interaction between the marine riser and fluids with vortex-induced vibration is evaluated on the basis of Matteoluca＇s wake oscillator model, an improvement of the Matteoluca model. Then the governing equation is discretized by using the Hermite interpolation function and the dynamic responses obtained through the Newmark method. The envelopes of displacements in terms of various external conditions as well as the curves of transverse vortexinduced vibration were then plotted. These research results provide a basic foundation for practical design and theoretical analysis of marine risers.