SPAR平台系泊系统模态分析  

Modal Analysis of Mooring System of Spar Platform

作　　者：唐友刚[1] 张若瑜[1] 庄茁[2] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]清华大学航天航空学院,北京100084

出　　处：《中国造船》2008年第A02期397-402,共6页Shipbuilding of China

基　　金：国家863项目（2007AA09Z30）;国家自然科学基金项目（50679051）：国家自然科学基金重点项目（50639030）

摘　　要：考虑深水系缆的拉伸和弯曲变形，取正交坐标和切向量描述任意结点的6个广义位移，计及缆变形的几何非线性和水动力影响，基于细长杆理论推导缆索的单元刚度矩阵，得到12×12的非线性单元刚度矩阵，实现了单元与有限元软件的调用对接。针对水深318m的Spar平台，四根缆定位，计算了前12阶固有频率和模态。计算结果表明，上述单元刚度矩阵能够反映深海系泊缆的力学特性，得到的频率和模态特性基本合理。The 6 generalized displacements of the nodes are described by rectangular coordinate and their tangent vector , as well as considering the extension and bending deformation of cable in deep sea. The 12×12 nonlinear stiffness matrix is obtained based on the rod theory considering the geometric nonlinearity and the effect of water dynamic and the finite element can be called by general finite element software. The spar platform with 4 mooring cables in 318m depth is analyzed, and the first 12 modes and natural frequency of the mooring system are calculated. The result shows that the mechanical properties of mooring cable in deep sea can be reflected with user defined element, and the obtained frequency and modal characteristic are basic reasonable.

关 键 词：SPAR平台 细长杆理论 几何非线性 系泊系统 固有频率 模态 

分 类 号：TU323.301[建筑科学—结构工程] O327[理学—一般力学与力学基础]