基于谱分析方法的海上风机支撑结构疲劳寿命分析

摘要

A typical support structure of offshore wind turbine under wave and wind turbine load are calculated by the higher quality finite element model,and the effects of wave and wind on the fatigue life of the support structure of offshore wind turbine are analyzed.Also,the fatigue life of critical joint is evaluated by spectral-based method,and the contributions of short-term sea states to support structure are investigated further.The results shows that the fatigue life of joint could satisfy the design requirements,and great fatigue damages occur in the sea condition of higher wave height with lower occurrence probability,which should be paid more attention in the numerical computing.The fatigue damage that is induced by wave can't be neglected in fatigue resistant design of structure.%用精细化的有限元模型对某典型海上风机支撑结构进行了数值计算,分析了波浪以及风机荷载对海上风机支撑结构疲劳寿命的影响.利用热点应力谱分析的方法,对疲劳分析的关键点进行疲劳寿命评估,并进一步分析了各个短期海况对支撑结构疲劳累积损伤的影响.研究表明,节点的疲劳寿命满足设计要求;波浪离散表中概率较小、波高相对较大的海况,对海上风机支撑结构疲劳寿命影响很大,在计算中应该格外注意;波浪荷载引起的疲劳损伤在结构疲劳设计中不能忽略.