A novel approach is proposed to reduce, compared with the conventional binning approach, the large number of aeroelastic code evaluations that are necessary to obtain equivalent loads acting on wind turbines. These loads describe the effect of long‐term environmental variability on the fatigue loads of a horizontal‐axis wind turbine. In particular, Design Load Case 1.2, as standardized by IEC, is considered. The approach is based on numerical integration techniques and, more specifically, quadrature rules. The quadrature rule used in this work is a recently proposed “implicit” quadrature rule, which has the main advantage that it can be constructed directly using measurements of the environment. It is demonstrated that the proposed approach yields accurate estimations of the equivalent loads using a significantly reduced number of aeroelastic model evaluations (compared with binning). Moreover, the error introduced by the seeds (introduced by averaging over random wind fields and sea states) is incorporated in the quadrature framework, yielding an even further reduction in the number of aeroelastic code evaluations. The reduction in computational time is demonstrated by assessing the fatigue loads on the NREL 5 MW reference offshore wind turbine in conjunction with measurement data obtained at the North Sea, for both a simplified and a full load case.

中文翻译：

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使用正交规则技术计算海上NREL 5 MW基准涡轮机的疲劳设计载荷

与传统的分箱方法相比，提出了一种新颖的方法来减少为获得作用在风力涡轮机上的等效载荷所必需的大量气动弹性代码评估。这些载荷描述了长期环境变化对水平轴风力发电机疲劳载荷的影响。尤其要考虑由IEC标准化的设计载荷工况1.2。该方法基于数​​值积分技术，尤其是正交规则。这项工作中使用的正交规则是最近提出的“隐式”正交规则，其主要优点是可以直接使用环境测量结果来构造它。事实证明，所提出的方法使用大量减少的气动弹性模型评估（与装箱相比）可以得出等效载荷的准确估计。而且，由种子引入的误差（通过对随机风场和海况进行平均引入）被纳入正交框架，从而进一步减少了气动弹性代码评估的次数。在简化和满负荷情况下，通过评估NREL 5 MW参考海上风力涡轮机上的疲劳载荷以及在北海获得的测量数据，可以证明计算时间的减少。从而进一步减少了航空弹性规范评估的数量。在简化和满负荷情况下，通过评估NREL 5 MW参考海上风力涡轮机上的疲劳载荷以及在北海获得的测量数据，可以证明计算时间的减少。从而进一步减少了航空弹性规范评估的数量。在简化和满负荷情况下，通过评估NREL 5 MW参考海上风力涡轮机上的疲劳载荷以及在北海获得的测量数据，可以证明计算时间的减少。