深海系泊系统模态分析  

MODAL ANALYSIS OF MOORING SYSTEM IN DEEP SEA

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：《工程力学》2010年第1期233-239,共7页Engineering Mechanics

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：该文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,考虑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的非线性刚度矩阵,实现了该文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,计算了系泊系统固有频率和模态以及系泊缆群的张力响应。计算结果表明:该文单元刚度矩阵能够反映深海系泊缆的动力响应特性。Considering the extension and bending deformation of cable in deep sea, the 6 generalized displacements of nodes is described by rectangular coordinates and their tangent vectors. The 12 × 12nonlinear stiffness matrix is obtained based on the rod theory considering the geometric nonlinearity and the effect of water dynamic. The element can be called by general finite element software. A spar platform with 4 mooring cables in 318m depth is analyzed, the modes and natural frequencies of the mooring system are calculated and the tension response of cable system is obtained. The result shows that the dynamics properties of mooring cable in deep sea can be modeled with user defined element.

关 键 词：SPAR平台 细长杆理论 几何非线性 系泊系统 固有模态 

分 类 号：TU311.3[建筑科学—结构工程]