冰区海上风机的动力响应及疲劳分析

Dynamic response and fatigue analysis of offshore wind turbine in ice region

本文针对冰区作业的海上风机进行动力响应分析与疲劳损伤计算。采用Kaimal风速谱进行风载荷计算。采用K?rn?冰力谱进行冰载荷计算。分别进行风载荷、冰载荷与风冰联合作用3种不同工况下的海上风机动力响应分析与疲劳损伤评估。结果表明,风载荷作用下塔筒顶端位移要远大于冰载荷作用。风冰联合作用下风机在泥面处的支座反力与弯矩均大于单一载荷的作用。冰载荷作用下风机的疲劳损伤小于风载荷所造成的疲劳损伤,但风冰联合作用下风机的疲劳损伤均大于任一载荷单独作用。采用DNV方法计算得到的疲劳损伤值较接近风冰载荷联合作用计算结果,且偏于保守。

In this paper,the dynamic response analysis and fatigue damage calculation was carried out for offshore wind turbine.Wind load was calculated with Kaimal wind speed spectrum and ice load with K？rn？ ice force spectrum.The dynamic response analysis and fatigue damage assessment of offshore wind turbine were implemented under wind load,ice load and combination of them respectively.The results indicated that the displacement at the top of the tower under wind load was much larger than that of ice load.Bearing reaction and bending moment of offshore wind turbine at the mudline under joint of wind and ice load were larger than the function of the single load.The fatigue damage of offshore wind turbine under wind load was less than that caused by wind load.However,the fatigue damage of offshore wind turbine subjected to combined effect of wind and ice load was greater than that of any load.The fatigue damage calculated by DNV method was closer to that caused by joint of wind and ice load and it was conservative.