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在Hermite矩模型基础上,根据Kaimal谱生成某典型风机结构正常风速条件下,三种不同概率特性风场(高斯、非高斯硬化和软化),在考虑来流风向和平均风速联合概率密度条件下,以塔架基础连接处为例,对风机进行疲劳寿命可靠性分析.由叶片的气动模型和多体动力,计算出风机的动力响应,并对响应的时域和频域特性进行分析.基于线性损伤累积理论和Paris公式,对来流全风向条件下的裂纹形成寿命和裂纹扩展寿命进行了详细讨论.结果表明,裂纹形成寿命对风荷载的非高斯性较为敏感,而裂纹扩展寿命对风荷载的非高斯性并不敏感,需要考虑风荷载的非高斯性对风机结构疲劳损伤的影响.此外,在考虑全风向来流条件下,疲劳裂纹形成和扩展阶段的失效位置相同,均在主导风向上.
Based on the Hermite moment model, three different probability wind fields (Gaussian, non-Gaussian hardening and softening) are generated according to Kaimal spectrum under the normal wind speed of a typical wind turbine structure. Considering the combined probability density of the incoming wind direction and the average wind speed , Taking the tower foundation connection as an example to analyze the reliability of the fatigue life of the fan.The dynamic response of the fan is calculated from the aerodynamic model and the multi-body dynamic of the blade, and the time and frequency domain characteristics of the response are analyzed. Linear cumulative damage theory and the Paris formula, the crack formation life and the crack propagation life under full flow direction are discussed in detail.The results show that the crack formation life is more sensitive to the non-Gaussian wind load, and the crack propagation life to the wind The non-Gaussianity of the load is not sensitive, and the effect of non-Gaussianity of wind load on the fatigue damage of the wind turbine structure needs to be considered. In addition, under the condition of total wind direction and inflow, the failure locations of the fatigue crack formation and expansion phases are the same Wind direction.