浮式风机基础高效“混合”时域疲劳分析  

Efficient"Mixed"Fatigue Analysis in Time Domain for Floating Offshore Wind Turbine Substructures

作　　者：杨林林 杜海越 李红涛[1] 唐广银[1] YANG Linlin;DU Haiyue;LI Hongtao;TANG Guangyin(Offshore Engineering Technology Center,China Classification Society,Tianjin 300457,China)

机构地区：[1]中国船级社海洋工程技术中心,天津300457

出　　处：《船舶工程》2025年第1期22-29,共8页Ship Engineering

摘　　要：[目的]在风浪耦合作用下,漂浮式风机基础疲劳损伤的精确评估理论上需在时域下进行载荷传递和瞬态响应有限元分析,为解决该方法计算耗时长,工程上难以直接应用等问题,[方法]提出一种高效“混合”时域疲劳分析方法。对各疲劳工况进行一体化时域仿真分析,输出随机波面时序、塔底风机载荷时序和浮体运动加速度时序;计算塔底单位载荷和浮体单位加速度的结构应力传递函数,进而求解由塔底风机载荷时序和浮体加速度时序引起的应力分量时序;计算单位波幅产生的应力传递函数RAO,然后通过频域到时域转换获取随机波浪下的应力分量时序;叠加上述各部分应力分量时序求解主应力时序;基于雨流计数法并选取适当的S-N曲线,应用Palmgren-Miner线性累积损伤理论得到各热点处的疲劳损伤。[结果]在此基础上,以某7.25MW半潜式浮式风机基础为计算实例,验证了该方法在工程计算分析上的可行性和优越性。[结论]研究成果可为浮式风机基础疲劳分析提供一定参考。[Purpose]Under the coupling effect of wind and waves,the accurate assessment of fatigue damage in floating offshore wind turbine substructures theoretically requires load transfer and transient response finite element analysis in the time domain.To solve the problems of long calculation time and difficulty of direct application in engineering,[Method]an efficient"hybrid"time domain fatigue analysis method is proposed.The integrated time-domain analysis of various fatigue conditions is simulated,and the random wavefront time sequence,the tower bottom fan load time sequence,and the floating body motion acceleration time sequence are output;The structural stress transfer functions of the unit load at the bottom of the tower and the unit acceleration of the floating body are calculated,and then the stress component time series caused by the load time series of the tower bottom fan and the acceleration time series of the floating body are solved;The stress transfer function RAO generated by the unit wave amplitude is calculated,and then the time series of stress components under random waves is obtained through frequency domain to time domain conversion;The stress component time series of the above parts are superimposed to solve the principal stress time series;Based on the rainflow counting method and the selection of appropriate S-N curves,the Palmgren Miner linear cumulative damage theory is applied to obtain the fatigue damage at each hotspot.[Result]On this basis,a 7.25 MW semi submersible floating offshore wind turbine substructure is selected as a calculation example to verify the feasibility and superiority of this method in engineering calculation analysis.[Conclusion]The research results can provide some references for the fatigue analysis of floating offshore wind turbinesubstructures.

关 键 词：浮式风机基础 风浪耦合 疲劳分析 应力传递函数 

分 类 号：TU834.4[建筑科学—供热、供燃气、通风及空调工程]