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Structural damage identification of offshore wind turbines: A two-step strategy via FE model updating
Structural Control and Health Monitoring ( IF 5.4 ) Pub Date : 2021-10-30 , DOI: 10.1002/stc.2872
Zhiming Zhang 1 , Chao Sun 1 , Vahid Jahangiri 1
Affiliation  

This study proposes a two-step strategy for damage identification of offshore wind turbines via Finite Element (FE) model updating. In this methodology, the first step identifies the damaged component(s) using a verified global mathematical model of the offshore wind turbine under operational wind and wave loading. Damaged components can be the tower, a certain blade, or the foundation. Natural frequencies and mode shapes obtained from operational modal analysis are used to formulate the objective function for deterministic model updating. With the identified damaged component(s) in the first step, the second step of the strategy focuses on exact damage localization and quantification of the damaged component(s). To this end, an FE model of a baseline 5 MW monopile offshore wind turbine is established using ANSYS. Wind and wave loading are applied to simulate the structural responses under different damage scenarios. In additional to natural frequencies and mode shapes, mode shape curvatures obtained in the second step are included in the objective function. Results indicate that the proposed methodology can correctly identify most structural damage on the offshore wind turbines using operational data. The proposed two-step damage identification strategy can circumvent the requirement of intensive computation due to full model updating of offshore wind turbine models and thus greatly improve the efficiency in real application.

中文翻译:

海上风力涡轮机的结构损伤识别:通过有限元模型更新的两步策略

本研究提出了一种通过有限元 (FE) 模型更新对海上风力涡轮机进行损伤识别的两步策略。在该方法中,第一步使用经过验证的海上风力涡轮机在运行风浪载荷下的全球数学模型来识别损坏的组件。损坏的组件可能是塔架、某个叶片或基础。从操作模态分析中获得的固有频率和振型用于制定确定性模型更新的目标函数。在第一步中识别出损坏的组件后,该策略的第二步侧重于准确的损坏定位和损坏组件的量化。为此,使用 ANSYS 建立了基线 5 MW 单桩海上风力涡轮机的有限元模型。应用风和波浪载荷来模拟不同损伤情景下的结构响应。除了固有频率和振型之外,在第二步中获得的振型曲率也包含在目标函数中。结果表明,所提出的方法可以使用运行数据正确识别海上风力涡轮机的大多数结构损坏。提出的两步损伤识别策略可以规避海上风机模型全模型更新带来的密集计算需求,从而大大提高实际应用的效率。结果表明,所提出的方法可以使用运行数据正确识别海上风力涡轮机的大多数结构损坏。提出的两步损伤识别策略可以规避海上风机模型全模型更新带来的密集计算需求,从而大大提高实际应用的效率。结果表明,所提出的方法可以使用运行数据正确识别海上风力涡轮机的大多数结构损坏。提出的两步损伤识别策略可以规避海上风机模型全模型更新带来的密集计算需求,从而大大提高实际应用的效率。
更新日期:2021-10-30
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