海上风机支撑结构疲劳性能试验研究

  目的  针对海上风机支撑结构的疲劳问题，进行了外加强环过渡段结构疲劳性能的试验研究。  方法  采用简化的支撑结构1/5缩尺模型进行了静力与疲劳试验，获得了模型的热点应力和疲劳寿命；并根据DNV的海上风机规范，采用不同类型单元对试验模型进行了有限元分析和疲劳寿命估算，将规范方法的计算结果与试验进行了比较。  结果  结果表明:试验结果和规范方法之间的差异主要源于S-N曲线的选取。  结论  最后根据试验数据，在DNV规范的基础上给出两种改进的疲劳校核方案，可为实际应用提供指导。

Fatigue Testing of Support Structure for Offshore Wind Turbine

［Introduction］ In view of the fatigue problem of support structure for offshore wind turbine， fatigue performance of transition piece with external stiffening ring was studied.  Method  Static and fatigue tests of A1/5 scale simplified support structure model were carried out to obtain their hot spot stress and fatigue life. Finite element analysis for the test model was conducted with different element type according to DNV rules. Fatigue damage obtained from experimental tests was compared with that calculated by numerical simulations.  Result  The results show that the main discrepancy between test results and specification methods is the selection of S-N curves.  Conclusion  Finally， on the basis of experimental data and DNV rules， two different methods for evaluating the fatigue damage of transition piece are given. This work provides some guidance for further application.