横向与扭转耦合振动的输电线舞动分析

The numerical simulation analysis of the transmission lines galloping by considering transverse and torsion coupling

基于O.Nigol的扭转舞动机理建立了横向与扭转耦合振动的动力学模型。通过惯性项解耦,利用Matlab对系统进行数值仿真,分析了风速、覆冰厚度、来流密度、导线单位长度质量、初始张力、阻尼比等参数对舞动振幅的影响,发现风速是决定输电线是否舞动的主要原因,对解决类似的实际工程问题有一定的借鉴价值。随着风速的增大,系统出现了周期解分岔的行为。

Based on the O.Nigol mechanism,the dynamics model of galloping transmission lines which considering the transverse and torsion coupling is constructed.By using the mathematical method with decoupling of inertia term and Matlab program,the dynamic system was simulated.The influences of wind velocity,vertical damping,static tension,thickness of ice,density of lines and air density on the amplitude of galloping were obtained.The variation of galloping amplitude under different system parameters were analyzed,it showed that the parameters of the speed of wind was the main reason for determining the transmission lines galloping,which provided valuable reference and instruction for solving the similar practical engineering problems.It is shown that the bifurcation of periodic solutions appear with the increasing of wind speed.