海洋缆——体系统三维动态分析

Three Dimensional Dynamic Analysis of Ocean Cable-Body System

本文给出了海洋缆体系统三维动态性能时域分析的仿真模拟数值研究方法,文章采用凝集参数法模拟缆体系统,计算了动态张力和动态构形。模拟了质量非连续分布的缆体系统(有流,无流状态)。采用四阶尤格库塔法对非线性运动方程进行数值积分,两个算例表明了流对缆的构型和张力的影响。

The present paper gives an overall discription of a computerized method which analyzes in the time domain the three-dimensional dynamic behavior of ocean cable-body systems. A Lumped parameter approach is used to model the cable-body system. The program calculates dynamic tension and motion responses. Current profiles, in-line packages, ship speed, water surface and seafloor boundaries, payload propulsion can be simulated. The model is capable of analysing both constant diameter and lumpy arrays of arbitrary buoyancies, the highly nonlinear equations of motion are decoupled form the unknows and solved numerically with respect to an earth fixed inertial reference frame by a forth-order Rung-Kutta method. Two sample problems are discussed. The first example basically checks the accuracy of the formulation for two dimensional cages. Another example involving circular turning maneuvers of the lower end vehicle, the calculated results show the effects of current on the configuration and tension.