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目前,风力发电机各段塔筒多采用进口厚型锻造法兰连接,其生产加工成本高、周期长。反向平衡法兰是一种新型节点,可应用于受疲劳荷载作用的风力发电机塔筒连接;与反向平衡法兰配套的施工器具—高强螺栓液压张拉器是保证风力发电机塔筒刚性连接的重要技术措施。本文利用通用有限元软件ABAQUS对该法兰的静力和疲劳性能进行弹塑性分析,并分析了高强螺栓液压张拉器张拉反向平衡法兰螺栓的过程及螺栓预拉力损失。结果表明:反向平衡法兰受力明确,具有足够的安全储备,满足1000万次疲劳寿命要求;有限元手段能较好地模拟张拉过程,分析得到的预拉力损失与试验结果接近。
At present, the tower sections of wind turbines are mostly imported thick forged flange connection, the production and processing costs are high, the cycle length. Reverse balance flange is a new type of node, can be applied to fatigue load by the wind turbine tower connection; and reverse balance flange supporting construction equipment - high-strength bolt hydraulic tensioner is to ensure that the wind turbine tower Rigid connection of the important technical measures. In this paper, the general finite element software ABAQUS is used to analyze the static and fatigue properties of the flange elasto-plastic analysis. The process of tensioning the flange bolts and the pretension loss of the bolts by the hydraulic tensioner are analyzed. The results show that the counter-balance flange has a definite stress and a sufficient safety margin to meet the requirements of 10 million cycles of fatigue life. The finite element method can simulate the tension process well and the pre-tension loss is close to the experimental result.