中文摘要：

基于考虑输电导线垂直、水平和扭转振动耦合的3自由度模型,利用数值方法,针对系统参数和环境参数对临界风速的影响以及可能的复杂舞动模式进行了分析.给出了覆冰厚度、初始覆冰角度、来流密度、导线初始张力、单位长度质量和横向阻尼比对临界风速的影响曲线.在讨论舞动可能出现的复杂运动时,发现随风速的变化,由于周期运动的分岔可导致概周期运动和混沌等复杂运动形式.

英文摘要：

The influence of system parameters and environment parameters on the critical wind speed ot galloping is investigated based on the 3 DOF model considering the coupling among vertical, horizontal and torsional motions of power transmission lines by numerical simulation. The curves between the critical wind speed and ice thickness, initial ice angle, air density, initial tension, mass of unit length and lateral damping ratio are given respectively. And then the complex motion resulted from bifurcation of galloping is studied. It is shown that the bifurcation of periodic motion can lead to quasi-periodic motion and chaos when wind speed changed.