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本文应用线性波理论,通过波浪叠加法,探讨了海洋平台油气生产立管系统的动力性质。应用线性化的Morison方程计算作用于立管的波浪力,包括随机波和规则波两种情况。有限元方程的求解是通过模式叠加方法在时域内进行的。分析了波力单独作用及由波力和平台位移共同作用下立管的两种动力响应情况。介绍并比较了所得到的数值结果,包括位移、扭矩和弯矩等数据。结果表明,本文所提出的分析方法是可行的,计算机程序则可为立管的强度设计提供方便。
In this paper, the dynamic properties of riser system for offshore oil and gas production are discussed by using wave theory and wave superposition method. The linearized Morison equation is used to calculate the wave forces acting on the riser, including both stochastic and regular waves. The solution of the finite element equation is carried out in the time domain by the mode superposition method. Two kinds of dynamic response of riser under the action of wave force alone and by wave force and platform displacement are analyzed. Introduced and compared the numerical results obtained, including displacement, torque and bending moment and other data. The results show that the analysis method proposed in this paper is feasible, while the computer program can provide the convenience of riser strength design.