三维风场下风机基础疲劳性能研究

On the Fatigue Performance of Wind Turbine Foundation in Three-dimensional Wind Field

考虑三维风场对风机结构产生的整体作用,采用谐波叠加法进行三维脉动风场模拟并通过ABAQUS建立2 MW风机整体有限元模型,确定热点位置、提取热点应力时程曲线,并比较最大位移点处三维风场作用与纵风向作用位移特征值,明确考虑三维风场影响的必要性,最后对基础环的下法兰宽度、埋深及混凝土强度等级进行参数分析表明,增加下法兰宽度、埋深或提高混凝土强度等级能一定程度上降低风机基础疲劳损伤。

Considering the overall effect of the three-dimensional wind field on wind turbine structures,the fatigue performance of the wind turbine foundation is studied.A finite element model of the 2 MW wind turbine is established in ABAQUS software,and the harmonic superposition method is used to simulate the three-dimensional pulsating wind field.The location of the hotspots is determined and the time history curves of the stress in hotspots are obtained.The displacement characteristic values of the maximum displacement point under the three-dimensional wind field and the longitudinal direction wind effect are compared.The necessity of considering the effect of the three-dimensional wind field is clarified.Then,parametric analysis is carried out on the lower flange width,burial depth and concrete strength grade of the foundation ring.It is shown that increasing the lower flange width and the burial depth,or improving the concrete strength grade can reduce the fatigue damage of the wind turbine foundation to a certain extent.