考虑多种因素的覆冰输电线舞动的有限元分析

Finite element analysis of iced conductor galloping involving multi-factors

采用梁单元模拟覆冰输电线,利用Newmark时间积分和Newton-Raphon非线性迭代法求解有限元方程,编写了相应的有限元程序,通过有限元软件ANSYS计算并验证了方法和程序的正确性.研究了风速、和档距长度对舞动幅值及导线舞动过程中张力的影响,同时探讨了攻角对舞动的影响,得出了一些重要规律,为导线舞动的预防及减小舞动的幅值提供了依据.

A finite element method,with the time integral by Newmark method and the Newton-Raphson iteration solution for nonlinear equation,was applied to simulate galloping of conductor by using beam element,and a computer program based on the method is made to analyze the galloping of transmission lines.In this paper,the method and program are verified by adopting finite element software ANSYS.The computation results agree well with the existing results,which show that the proposed method in this program is reasonable.Having studied the influence of wind speed,span length on the amplitude of galloping and tension in the process of galloping,meanwhile discussed the effect of attacking angle,it can be obtained some important rule,which provide the basis of preventing conductor galloping and decreasing amplitude of galloping.