摘要
考虑系泊缆索拉伸-弯曲-扭转响应下的非线性变形,建立局部坐标系下系泊缆索的动力学微分方程,通过四元参数法进行坐标系的转换,并使用“盒子法”和Newton-Raphson方法将方程简化为数值方程,建立系泊缆索数值分析模块。考虑风、浪载荷,将风机和浮式基础视为刚体,建立风机-浮式基础的刚体动力学方程。通过铰接点和坐标变换,开发了风机-浮式基础-系泊系统的动力响应计算程序。针对OC4-DeepCwind浮式风机,分析额定工况下浮式风机的动力响应,并与准静态的悬链线方法进行对比。结果表明,系泊系统的张力发散,影响浮式基础纵荡运动的均值。对系泊缆索进行敏感性分析表明,气动载荷影响缆索张力的均值,波浪参数影响缆索张力的离散性,缆索浮力对张力的均值和幅值都有影响,环境参数的改变将影响缆索截面应力的分布。采用动态分析方法时,考虑缆索受到的浮力会对系泊缆索的疲劳寿命计算产生影响。
Considering non-linear deformation of the mooring cable under coupled response of tension,bending and torsion,dynamic differential equations of the mooring cable are established in the local co-ordinate system and reduced to numerical equations by using the"box method"and the Newton-Raphson method.Dynamic response of the wind turbine system-floating foundation-mooring system is calculated by means of articulation points and coordinate transformation.For the OC4-DeepCwind floating wind turbine,dynamic response of the floating wind turbine under rated conditions is analyzed and compared with the quasi-static suspended chain-line method.The results show that the tension amplitude of the mooring system diverges and appears as a complex high frequency band,which affects the mean value of the longitudinal oscillation motion of the floating foundation.Sensitivity analysis of the mooring cable shows that pneumatic loads will affect the mean cable tension;wave parameters will affect the dispersion of the cable tension;cable buoyancy will affect mean value of the tension and its amplitude and variation of environmental parameters will affect stress distribution in the cable section,which will have an impact on the fatigue life of the mooring cable.
作者
张若瑜
陈六合
赵文斌
李焱
赵同岩
ZHANG Ruoyu;CHEN Liuhe;ZHAO Wenbin;LI Yan;ZHAO Tongyan(School of Architecture and Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Ministry of Education and Tianjin Municipality for Port and Marine Engineering,Tianjin University,Tianjin 300072,China;Shanghai Ship Research and Design Institute,Shanghai 201203,China)
出处
《中国造船》
EI
CSCD
北大核心
2023年第2期70-81,共12页
Shipbuilding of China
关键词
拉弯扭耦合响应
浮式风机
系泊系统
动态响应
敏感性分析
coupled response of tension,bending and torsion
floating wind turbine
mooring system
dynamic response
sensitivity analysis
