超大功率风力发电机组塔筒屈曲分析

以某型8 MW风力发电机组塔筒为对象,采用有限元方法开展超大功率风力发电机组塔筒屈曲特性分析.建立塔筒门洞段有限元模型,研究门框对塔筒屈曲稳定性的影响,结果表明:门洞加框能提高塔筒屈曲稳定性.为进一步提高塔筒屈曲稳定性,提出塔筒内壁设置加强筋的强化设计方法,研究加筋数目、加筋尺寸与塔筒屈曲稳定性的作用规律,结果表明:环...

BUCKLING ANALYSIS OF LARGE WIND TURBINE TOWERS

Taking a certain type of 8 MW wind turbine tower as the research object, this paper provides a detailed analysis of buckling features of large wind turbine towers by applying the finite element method. A finite element model of the gate section of the tower is established to study the influence of the door frame on the buckling stability of the tower. The results show that adding a frame to the gate can improve the buckling stability of the tower. In order to further improve the buckling stability of the tower, an updated design method to equip stiffeners on the inner wall of the tower, is proposed, in which the influences of the number and size of stiffeners on the buckling stability of the tower is researched. It is found that the best buckling stability of the tower can be achieved when two ring reinforcements with a dimension of 160 mm×18 mm are used, which means a 55% increase of the first-order buckling eigenvalue. It also carries out a nonlinear buckling analysis of the tower with stiffeners, showing that the influence of material plasticity, geometric nonlinearity, and initial defects cannot be neglected in the calculation of the critical buckling load of the tower. The critical buckling load will decrease sharply when the initial defect degree in creases. Therefore, the initial defect degree should be minimized during the manufacturing process of the tower.