动态外载荷工况下风力机法兰螺栓相对刚度研究  

Research on the Relative Stiffness of Wind Turbine Flange Bolts Under Dynamic External Load Conditions

作　　者：彭波[1,2] 蔡学长 明仕林 李严 曹毅 曹剑绵 田大庆 Bo Peng;Xue-chang Cai;Shi-lin Ming;Yan Li;Yi Cao;Jian-mian Cao;Da-qing Tian(University of Electronic Science and Technology of China;Dec Academy of Science and Technology Co.,Ltd.;Sichuan University)

机构地区：[1]电子科技大学 [2]东方电气集团科学技术研究院有限公司 [3]四川大学

出　　处：《风机技术》2024年第3期91-96,共6页Chinese Journal of Turbomachinery

基　　金：风电螺栓故障预警数字孪生评估系统SC0022108。

摘　　要：螺栓相对刚度决定了工作中螺栓拉力大小。为探究风力机法兰盘螺栓拉力与外载荷关系,基于法兰单元等效圆柱模型与等效压缩变形体模型,结合有限元仿真,研究了不同工况下螺栓相对刚度的变化情况。研究结果表明,螺栓相对刚度与外载荷的性质和施加位置有关;与上下法兰单元间接触面积和螺栓初始预紧力呈负相关;动态外载荷工况下表现出明显的非线性特性。研究结论可为风力机法兰盘螺栓组设计与装配以及螺栓组松动故障预警诊断提供参考。The relative stiffness of the bolt determines the bolt tension during working.In order to explore the relationship between the bolt tension and the external load of the fan flange,this paper studies different processes based on the flange unit equivalent cylindrical model and equivalent compression deformation body model,combined with finite element simulation.Changes in relative stiffness of bolts under different conditions.The research results show that the relative stiffness of the bolt is related to the nature and position of the external load,and is negatively correlated with the contact area between the upper and lower flange units and the initial pre-tightening force of the bolt.It shows obvious nonlinear characteristics under dynamic external load conditions.The research conclusions of this article can provide reference for the design and assembly of fan flange bolt groups and early warning diagnosis of bolt group loosening faults.

关 键 词：螺栓连接 相对刚度 等效压缩变形体 非线性特性 

分 类 号：TK83[动力工程及工程热物理—流体机械及工程] TM614[电气工程—电力系统及自动化]