考虑海底撞击力的系缆运动及张力分析

Analysis of Motion and Tension for Cable Considering the Impact of Seabed

考虑深海平台系缆的拉伸形变及与海底的撞击力,采用集中质量法,建立了系缆方程组.采用Newmark-β法和牛顿法求解非线性系缆方程组,提出了系缆运动和动态张力的计算方法.计算了318,m水深系缆顶端点做垂向运动时,系缆运动和动态张力响应.结果表明,系缆与海底之间的相互作用力对于系缆运动和张力具有较大影响,计算系缆运动和动态张力时,需要计入海底作用力的影响。

According to the tensile deformation and the impact with the seabed of cable for the platform in the deep water, the lumped mass method was adopted to set up the cable equation. Newmark-β method and Newton method were adopted to calculate the nonlinear equation of cable so that the calculation methods of the cable motion and the dynamic tension were advanced. The response for cable motion and dynamics tension were obtained when the cable point is in the vertical motion in the depth of 318 m. The result shows that the interaction of cable and the seabed has great effect on the motion and the tension of cable, so it must be considered in the calculation of motion and the dynamic tension of cable.