深水Spar平台在不规则波中的运动响应  

Motion Responses Analysis of Moored Spar Platform in Irregular Waves in Deepwater

作　　者：王兴刚[1] 孙昭晨[1] 梁书秀[1] 

机构地区：[1]大连理工大学土木水利学院,大连116024

出　　处：《中国造船》2011年第2期16-24,共9页Shipbuilding of China

基　　金：国家863项目资助(2007AA11Z130);国家创新研究群体科学基金(5092100)

摘　　要：南海水深一般在500m到2000m,属于深水区,Spar平台的适用水深为500m到3000m,是深水开发的经济型平台。对系泊于2000m水深的Classic Spar平台在不规则波作用下的运动响应和缆索张力进行了数值模拟。首先通过频域方法得到Spar平台的波浪作用力传递函数、附加质量和辐射阻尼,然后通过快速傅立叶变换将频域结果转换到时域;基于全量的拉格朗日表述和两节点的等参索单元,应用几何非线性有限元方法和Newmark方法计算系泊缆索张力;应用四阶龙哥库塔法计算时域运动方程,得到Spar平台的运动响应和缆索张力。采用JONSWAP波能谱生成不规则波面,考虑了谱峰升高因子不同取值的影响,分析了二阶漂移力、不同缆索初张力和缆索刚度对于系泊系统的影响。The depth of South China Sea is usually between 500 meters and 2000 meters, which belongs to deep water, while Spar platform is suitable for economic development platforms in deep water with the depth between 500 meters and 3000 meters. An numerical simulation for motion response and the tension of cable in irregular waves of Classic Spar platform moored at the depth of 2000m undersea is performed in this paper. First of all, the wave force, added mass and radiation damping are gotten through the method of frequency domain, and then the fast Fourier transform is applied to transfer the results from frequency domain to timedomain. The tension of mooring rope is calculated based on the total Lagrangian formulation and two-node isoparametric cable unit as well as Geometric nonlinear finite element method and Newmark method. Motion response and cable tension are gotten with the help of Runge Kutta method of fourth order equation of motion in time domain. Irregular wave surface is obtained by JONSWAP wave spectrum, and impact of overshoot parameter is taken into account. The effects on the mooing system of second order drifting force, pretension and elastic stiffness of mooring lines have been analyzed.

关 键 词：船舶 舰船工程 SPAR平台 几何非线性有限元 缆索 

分 类 号：U664-381[交通运输工程—船舶及航道工程] P75[交通运输工程—船舶与海洋工程]