扇形覆冰导线舞动的力学模型分析与仿真模拟

Mechanics Model Analysis and Numerical Simulation of Sector Icing Conductor Galloping

针对扇形覆冰导线的舞动问题,以中山口某输电线路覆冰导线舞动为例,应用龙格-库塔法在Matlab仿真软件中对扇形覆冰导线舞动模型进行了非线性数值求解和数值模拟分析,并假设输电线路的档间舞动为驻波,分析了气动力与导线扭转振动速度的耦合,提出了扇形覆冰导线舞动的三自由度舞动方程。结果表明,当扇形覆冰导线的扭转频率与横风向频率接近时扭转舞动激发横风向舞动,符合Nigol舞动机理,相同条件下扇形覆冰导线的舞动幅度比新月形覆冰导线大,数值模拟舞动振幅与实测结果相符,为扇形覆冰导线舞动机理的研究提供了参考。

Taking the icing conductor galloping of transmission lines in Zhongshakou as an example,Runge-Kutta method is applied to implement nonlinear numerical simulation of icing conductor galloping under the software Matlab simulation platform.Based on the hypothesis that transmission lines galloping in span is standing wave,this paper presents three degree of freedom galloping model of sector icing conductor and analyzes the velocity coupling between aerodynamic forces and conductor torsional vibration.The results show that the torsional galloping can cause lateral galloping when their vibration frequencies are close to each other,which is consistent with the galloping mechanism of Nigol;wave amplitude of the sector icing conductor is larger than crescent-shaped icing conductor in the same conditions;numerical simulation of galloping amplitude accords with the measured results.Thus,it provides reference for further study of the sector icing conductor galloping.