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Dynamic response analysis of offshore cable structures under wave forces

波浪力作用下海上电缆结构动力响应分析

基本信息

批准号：
02650328
负责人：
NAMITA Yoshio
金额：
$ 1.15万
依托单位：
Setsunan University, Faculty of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-02650328/
关键词：
offshore structure cable large deformation time history curved finite element ケ-ブル構造潮流・波浪応答解析 3節点曲線有限要素 3節点曲線要素

项目摘要

A method of dynamic response analysis of marine structural cables, which are used for the purpose of mooring, staying or guying the offshore structures under the action of tidal current and/or wave forces, is presented. Equations of motion of cable members under the action of fluid forces are derived by employing three node curvilinear finite elements which were formulated by the authors in the past. Truss members, rigid frame members and floating bodies, which are to be connected with marine cables, are also analyzed in the form of finite element formulation.Computer program based on the above theory is developed for practical use. The completed program provides three main functions, i.e., (i) three dimensional statics with large deformation, (ii) Eigenvalue analysis and (iii) time history analysis of dynamic response. Further, the numerical results of time history analysis can be displayed graphically in an automatic process, which makes it easy to read the results of computation. The accuracy of numerical solutions and convergence of nonlinear iteration were fully checked and the practicability of the program was cofirmed after many case studies. Further improvement is intended for the better usage of the program.Numerical examples are shown by setting up cable models which are supposed to be ones utilized in practical offshore structures. Numerical results obtained in this research as to large deformation of cables under the action of statical tidal current and dynamic response of cables subject to time-varying wave forces show fundamental behavior of staying or mooring cables of offshore structures.

提出了一种用于在潮流和/或波浪力作用下系泊、停留或拉紧海上结构物的海洋结构缆索的动力响应分析方法。利用作者过去制定的三节点曲线有限元推导了索杆在流体力作用下的运动方程。还以有限元公式的形式对与船用电缆连接的桁架构件、刚性框架构件和浮体进行了分析。基于上述理论开发了计算机程序以供实际使用。完成的程序提供三个主要功能，即（i）大变形三维静力学，（ii）特征值分析和（iii）动态响应时程分析。此外，时程分析的数值结果可以在自动过程中以图形方式显示，这使得计算结果易于读取。经过多次实例研究，充分检验了数值解的准确性和非线性迭代的收敛性，证实了程序的实用性。进一步的改进是为了更好地使用该程序。通过建立适合实际海上结构物使用的电缆模型来进行数值算例。本研究获得的关于静态潮流作用下缆索大变形和时变波浪力作用下缆索动态响应的数值结果显示了海上结构物拉索或系泊缆索的基本行为。