不均匀覆冰输电导线舞动精细化分析

针对不均匀覆冰输电导线力学特性以及舞动分析难题, 文章以单档距不均匀覆冰输电导线为研究对象, 建立输电线路不均匀覆冰物理模型, 推导不均匀覆冰导线初始形状函数和空气动力系数修正公式, 基于 ANSYS 给出不均匀覆冰精细化分析流程, 并对 4 种典型不均匀覆冰工况下的导线进行力学特性分析、初始找形以及舞动分析仿真实验。结果表明: 相较于等效均匀覆冰模型, 采用该文提出的不均匀覆冰输电线路舞动精细化分析方法, 导线初始位形准确度可提高近 10%, 舞动分析精度最大提高 25%。

Aiming at the problems of mechanical properties and galloping analysis of non-uniformly iced transmission lines, this paper takes the single-span non-uniformly iced transmission lines as the research object, establishes the physical model of non-uniformly iced transmission lines, and derives the initial shape function and aerodynamic coefficient correction formula of non-uniformly iced transmission lines. Based on ANSYS, the refined analysis process of non-uniformly iced transmission lines is given, and the dynamic characteristics analysis, initial form-finding and galloping analysis simulation tests of transmission lines under four typical non-uniform icing conditions were carried out. The results show that compared with the equivalent uniform icing model, the accuracy of the initial shape of transmission lines can be improved by nearly 10% and the accuracy of galloping analysis can be improved by up to 25% by using the refined galloping analysis method of transmission lines with non-uniform icing proposed in this paper.