A comprehensive fatigue load set reduction study for offshore wind turbines with jacket substructures
A comprehensive fatigue load set reduction study for offshore wind turbines with jacket substructures
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DOI：
10.1016/j.renene.2017.10.097
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发表时间：
2018-04-01
期刊：
影响因子：
8.7
通讯作者：
Rolfes, Raimund
中科院分区：
文献类型：
--
作者：
Haefele, Jan;Huebler, Clemens;Rolfes, Raimund
设计海上风力涡轮机的导管架子结构需要大量的时域模拟，以应对风、波浪和水流状态的不同组合。关于复杂的设计方法，结合结构优化算法，载荷集的减少是非常可取的。为了获得关于设计载荷集的所需大小的知识，进行了疲劳极限状态载荷集的研究，其主要解决两个方面。第一个是随机子集的统计评估，这些随机子集来自概率载荷集，并具有从研究平台FINO3获得的现实环境数据。包括2048个负载模拟的全集逐渐减少到子集，并且将结果彼此进行比较。第二个方面是一个系统的负载设置减少与单向风，波浪和电流的假设。首先，确定临界方向。然后，单向负载集系统地减少。将相应的损伤与从八个测试结构的概率载荷集获得的损伤进行比较。研究表明，如果明智地考虑，忽略风、波浪和水流的失准并不一定意味着过度简化。本研究的结果可用于减少导管架设计过程中的数值工作量和平准化的能源成本。(C)2017爱思唯尔有限公司版权所有
Designing jacket substructures for offshore wind turbines demands numerous time domain simulations to face different combinations of wind, wave, and current states. Regarding sophisticated design methods incorporating structural optimization algorithms, a load set reduction is highly desirable. To obtain knowledge about the required size of the design load set, a study on fatigue limit state load sets is conducted, which addresses mainly two aspects. The first one is a statistical evaluation of random subsets derived from probabilistic load sets with realistic environmental data obtained from the research platform FINO3. A full set comprising 2048 load simulations is gradually reduced to subsets and the results are compared to each other. The second aspect is a systematic load set reduction with the assumption of unidirectional wind, waves, and current. Firstly, critical directions are determined. Then, unidirectional load sets are systematically reduced. The corresponding damages are compared to those obtained from probabilistic load sets for eight test structures. It is shown that the omission of wind-, wave-, and current-misalignment does not necessarily imply an excessive simplification, if considered wisely. The outcome of this study can be used to decrease the numerical effort of the jacket design process and the levelized costs of energy. (C) 2017 Elsevier Ltd. All rights reserved.