当前位置: X-MOL 学术Wind Energy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Structural reliability assessment of offshore wind turbine support structures subjected to pitting corrosion‐fatigue: A damage tolerance modelling approach
Wind Energy ( IF 4.1 ) Pub Date : 2020-07-12 , DOI: 10.1002/we.2542
Abdulhakim Adeoye Shittu 1, 2 , Ali Mehmanparast 1 , Mahmood Shafiee 3 , Athanasios Kolios 4 , Phil Hart 1 , Karl Pilario 1, 5
Affiliation  

The structural integrity of offshore wind turbine (OWT) support structures is affected by one of the most severe damage mechanisms known as pitting corrosion‐fatigue. In this study, the structural reliability of such structures subjected to pitting corrosion‐fatigue is assessed using a damage tolerance modelling approach. A probabilistic model that ascertains the reliability of the structure is presented, incorporating the randomness in cyclic load and corrosive environment as well as uncertainties in shape factor, pit size and aspect ratio. A non‐intrusive formulation is proposed consisting of a sequence of steps. First, a stochastic parametric Finite Element Analysis (FEA) is performed using SMART© crack growth and Design Xplorer© facilities within the software package ANSYS. Secondly, the results obtained from the FEA are processed using an Artificial Neural Network (ANN) response surface modelling technique. Finally, the First Order Reliability Method (FORM) is used to calculate the reliability indices of components. The results reveal that for the inherent stochastic conditions, the structure becomes unsafe after the 18th year, before the attainment of the design life of 20 years. The FEA results are in very good agreement with results obtained from analysis steps outlined in design standard BS 7910 and other references designated as ‘theoretical analysis methods’ in this study. The results predict, for the case study, that the pit growth life is approximately 56% of the total pitting corrosion fatigue life. Sensitivity analysis results show that the aspect ratio of pits at critical size plays a significant role on the reliability of the structure.

中文翻译:

点蚀腐蚀疲劳的海上风机支撑结构的结构可靠性评估:一种损伤容限建模方法

离岸风力涡轮机(OWT)支撑结构的结构完整性受到最严重的损伤机制之一的影响,该机制被称为点腐蚀疲劳。在这项研究中,使用损伤容忍建模方法评估遭受点蚀腐蚀疲劳的此类结构的结构可靠性。提出了一种确定结构可靠性的概率模型,其中考虑了循环载荷和腐蚀环境中的随机性以及形状因子,凹坑尺寸和纵横比的不确定性。提出了一种非侵入式的表述,包括一系列步骤。首先,使用软件包ANSYS中的SMART©裂纹扩展和Design Xplorer©工具执行随机参数有限元分析(FEA)。其次,从FEA获得的结果将使用人工神经网络(ANN)响应面建模技术进行处理。最后,使用一阶可靠性方法(FORM)来计算组件的可靠性指标。结果表明,对于固有的随机条件,在达到20年的设计寿命之前的18年之后,该结构变得不安全。FEA结果与设计标准BS 7910中概述的分析步骤以及本研究中指定为“理论分析方法”的其他参考文献的结果非常吻合。对于案例研究,结果预测,点蚀生长寿命约为点蚀腐蚀疲劳总寿命的56%。
更新日期:2020-07-12
down
wechat
bug