Abstract It is important to understand the vibration response and fatigue characteristics of the wind turbine structure. The fatigue reliability of the tower flange and bolt is studied in this paper. Firstly, by using the orthogonal expansion method and the Numerical-Theoretical method of random dynamic action, the random fluctuating wind field is expanded into a set of scattered points to calculate the wind load. The numerical calculation of the dynamic response of the wind turbine is verified with the measured data. Then, a fatigue probability calculation method based on the probability density evolution method is proposed. It is an effective method to substitute the fatigue damage D obtained by a rain flow counting method into the probability density evolution equation to solve the probability density of fatigue damage. In the end, a 1.5 MW wind turbine tower was taken as an example for analyzing the fatigue damage of its flange and bolt which considers the wind speed and wind direction distribution. By using the probability density evolution method, the evolution probability density curve clusters of the structural responses can be given accurately and quantitatively; thus, the reliability of the structure under random load can be conveniently obtained.

中文翻译：

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随机风荷载作用下风机塔架疲劳可靠性分析

摘要 了解风电机组结构的振动响应和疲劳特性具有重要意义。本文对塔身法兰和螺栓的疲劳可靠性进行了研究。首先，利用正交展开法和随机动力作用的数值理论方法，将随机脉动的风场展开成一组散点来计算风荷载。用实测数据验证了风力机动力响应的数值计算。然后，提出了一种基于概率密度演化方法的疲劳概率计算方法。将雨流计数法得到的疲劳损伤D代入概率密度演化方程，是求解疲劳损伤概率密度的有效方法。最后，一个1。以5 MW风机塔架为例，考虑风速和风向分布，分析其法兰和螺栓的疲劳损伤。利用概率密度演化方法，可以准确定量地给出结构响应的演化概率密度曲线簇；因此，可以方便地获得结构在随机载荷下的可靠性。