Finite element modeling optimization of wind turbine blades from an earthquake engineering perspective
Finite element modeling optimization of wind turbine blades from an earthquake engineering perspective
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DOI：
10.1016/j.engstruct.2020.111105
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发表时间：
2020-11
影响因子：
5.5
通讯作者：
Ahmer Ali;R. Risi;A. Sextos
中科院分区：
文献类型：
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作者：
Ahmer Ali;R. Risi;A. Sextos
在地震评估方面，风力涡轮机叶片通常被排除在数值研究之外，主要是由于其形状复杂且缺乏足够的数据。这往往会抑制它们的模态效应，使其不受整体动态响应的影响，并可能影响以传统方式确定的风力涡轮机地震易损性的可靠性，即，采用集中质量方法。本研究的目的是提供一个封闭形式的解决方案，用于推导典型翼型的横截面特性，以进一步计算典型风力涡轮机叶片的挥舞方向、沿边方向和扭转刚度。基于遗传算法（GA）的建模优化进行评估的几何和材料参数，是现实的叶片的代表。这些参数用于实现目标叶片质量、刚度和频率。所提出的方法导致设计解决方案（DS）作为这些参数的不同组合。每个DS导致机械和模态特性对于所有叶片配置都是等效的，例如具有或不具有腹板的叶片，具有或不具有结构扭曲和变化的变桨轴位置。这些解决方案被用来开发风力涡轮机模型中的RNA的叶片，以测试该方法的效率。建议在对风力涡轮机进行可靠的抗震评估时，应切实考虑叶片。
In a seismic assessment context, wind turbine blades are often excluded from numerical studies mainly due to their complex shape and lack of sufficient data. This tends to suppress their modal effect from the global dynamic response and can potentially influence the reliability of the seismic vulnerability of wind turbines, determined in a traditional manner, i.e., employing the lumped mass approach. This study aims to provide a closed-form solution for deriving the cross-sectional properties of a typical airfoil to further calculate the flapwise, edgewise, and torsional stiffness of a typical wind turbine blade. A genetic algorithm (GA)-based modeling optimization is performed to evaluate the geometric and material parameters that are representative of realistic blades. These parameters are used to achieve the target blade mass, stiffness, and frequencies. The proposed approach results in design solutions (DS) as different combinations of these parameters. Each DS leads to mechanical and modal characteristics that are equivalent for all blade configurations, such as blades with or without webs, with or without structural twist and varying pitch axis locations. These solutions are employed to develop the blades of the RNA in a wind turbine model to test the efficiency of the method. It is suggested that blades should be realistically considered for reliable seismic assessment of wind turbines.