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海上风电支撑结构等效疲劳荷载法存在的问题

Problem of Equivalent Fatigue Static Load for Offshore Wind Turbine Support Structure

    摘要
  • 摘要:
      目的  海上风电整个使用期内主要受到较大的随机荷载作用，抗疲劳设计是海上风电基础结构设计中的重要内容。目前计算疲劳损伤普遍采用的等效疲劳荷载法的适用性存疑，文章将对该方法进行评估。
      方法  简单回顾等效疲劳荷载设计法，在理论上分析其适用性。基于NREL 5 MW风机及虚拟的勘察资料，利用拟动力法和等效疲劳荷载法，计算导管架的某一节点的疲劳损伤。
      结果  等效疲劳荷载理论上仅在一维应力状态下才严格成立，数值模拟表明该方法会高估疲劳损伤。
      结论  等效疲劳荷载会高估疲劳损伤，可采用拟动力法计算疲劳损伤，但拟动力法的精确性需进一步评估。

     

    Abstract: Introduction Offshre wind turbine support structure is under large stochastic loads within the whole design life, thus fatigue design is an important subject. The Equivalent Fatigue Static Load Method (EFSLM) is widely used in calculating the cumulative fatigue damage, while this method is questionable and is studied in this research.
      Method  After a short review of EFSLM, its application scope was analysed theothetically. Based on NREL 5 MW wind turbine model and pseudo survey data, the quasi-dynamic method and EFSLM were used in calculating the cumulative fatigue damamge of a joint.
      Result  EFSLM is accurate only if the 1st principle stress is linear proportion to loads. Numerical simulation results indicate that EFSLM over estimates the cumulative fatigue damage.
      Conclusion  EFSLM over estimates the cumulative fatigue damage and the quasi-dynamic method is an alternative method, while, the accuracy of which needs further studies.

     

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