文档介绍：A Dissertation Submitted to Sha nghai Jiao Tong University for Master Degree Fatigue analysis of offshore wind turbine mono-pile support structure By Mo , Jihua Supervised by Prof. He ,Yanping School of Naval Architecture, Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai, . China February 2011 万方数据上海交通大学硕士学位论文摘要近海风电机组单桩式支撑结构疲劳分析摘要近海风电机组的支撑结构是近海风电场的重要组成部分, 承受水动力和空气动力双重交变载荷的作用。在寿命期内,载荷的循环次数很高,支撑结构的疲劳强度特别值得关注。用 WAs P 分析风场的风数据得到风速的分布情况,统计各工况的风、浪、流等环境参数。基于叶素——动量定理求出发电机的控制策略, 根据随机瞬时风速序列和发电机运行状态计算了近海风电机组单桩式支撑结构所受的风机载荷和风压作用,并通过 Morison 公式计算了浪流联合作用对支撑结构的载荷。运用 ABAQUS 对结构建模并通过振型叠加法计算结构的动力响应,求出应力的时间历程。根据 S-N 曲线、雨流计数法以及线性累积损伤理论,运用 fe-safe 计算结构在各工况下的疲劳损伤,估算出支撑结构的疲劳寿命并分析各种载荷对结构疲劳寿命的影响。结果表明,支撑结构的疲劳寿命满足要求;与其它载荷相比,风机载荷使支撑结构产生的应力响应值更高,变化幅度更大,风机载荷是结构疲劳的主要影响因素, 合理的发电机控制策略有助于减小风机载荷的波动并提高结构的疲劳寿命。关键词: 近海风电机组;载荷;动力响应;疲劳分析万方数据上海交通大学硕士学位论文摘要 Fatigue analysis of offshore wind turbine mono-pile support structure ABSTRACT Offshore wind turbine support structure is an ponent of offshore wind farm. The support struct ure is subjected to cyclic loads caused by both aerodynamic force and hydrodynamic force. During the service life, the cycle count s of the loads are so la rge that fatigue strength of the support structure deserves sp ecial attention. WAsP was used to analyze the wind data of a wind farm and the distribution of the wind speed was gained. The parameters of wind, wave and current for each working condition were calculated. Th e control strategy of generator was figured out based on momentum-blade element theory. According to the stochastic transient sequences of wind speed and the running condition of the turbine, turbine loads and wind pr essure acting on the offshore wind turbine mono-pile support structure were calculated. The loads caused by wave and current were also work ed out through Morison equation. ABAQUS was used to model the offshore wind turbine mono-pile support structure, the dynamic re sponse was calculated thr