Fragility analyses of offshore wind turbines subjected to aerodynamic and sea wave loadings
Fragility analyses of offshore wind turbines subjected to aerodynamic and sea wave loadings
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DOI：
10.1016/j.renene.2020.07.066
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发表时间：
2020-07
期刊：
影响因子：
8.7
通讯作者：
Haoran Zuo;K. Bi;H. Hao;Yu Xin;Jun Li;Chao Li
中科院分区：
文献类型：
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作者：
Haoran Zuo;K. Bi;H. Hao;Yu Xin;Jun Li;Chao Li
为了更有效地提取海洋区域的大量风能，海上风力涡轮机采用细长塔架和大转子结构。空气动力、海浪和地震载荷等外部振动源可能威胁这些能源基础设施的安全。评估海上风力发电机在外部振动源作用下的可靠性非常重要。先前关于风力涡轮机脆弱性分析的研究工作仅通过假设风力涡轮机处于停放状态且叶片质量集中在塔架顶部来考虑塔架的脆弱性。作为风力发电机最重要部件之一的叶片的脆性研究尚未见报道。在本研究中，在 ABAQUS 中开发了 NREL 5 MW 风力涡轮机的详细三维 (3D) 有限元 (FE) 模型，并对塔架和叶片进行显式建模，以真实地估计风力涡轮机的空气动力载荷和结构行为。考虑结构质量、刚度和阻尼的不确定性来开发塔架和叶片的概率风致需求模型。在概率框架中研究了同时承受空气动力和海浪载荷的风力涡轮机的动态行为，并推导和讨论了塔架和叶片在停放和运行条件下的易损性曲线。
To more effectively extract the vast wind energy in marine areas, offshore wind turbines have been constructed with slender tower and large rotor. External vibration sources such as aerodynamic, sea wave and seismic loadings can threaten the safety of these energy infrastructures. It is important to evaluate the reliability of offshore wind turbines subjected to external vibration sources. Previous research works on the wind turbine fragility analyses only considered the fragility of the tower by assuming the wind turbine was in the parked condition with the blade mass lumped at the top of the tower. The study of the fragility of the blade which is one of the most important components of a wind turbine has not been reported. In the present study, a detailed three-dimensional (3D) finite element (FE) model of the NREL 5 MW wind turbine is developed in ABAQUS, and the tower and blades are explicitly modelled to realistically estimate the aerodynamic loads and structural behaviours of the wind turbine. The uncertainties of the structural mass, stiffness and damping are taken into account to develop the probabilistic wind-induced demand models for the tower and blades. The dynamic behaviours of the wind turbine subjected to the simultaneous aerodynamic and sea wave loadings are investigated in a probabilistic frame and the fragility curves for both the tower and blades under the parked and operating conditions are derived and discussed.