大跨越高压输电塔线体系的动力特性分析

针对大跨越输电塔线体系,分别建立单导线、单塔、两基三垮塔线体系的有限元模型,将导线平面内和平面外动力特性的数值解与理论解进行比较,结果表明,所建立的模型能够较好地反映输电导线的动力特性.分析了单塔与两基三跨塔线体系的动力特性,比较了计算结果,认为低频区塔线体系的振动大多以导线的振动为主,塔架对于输电线振动频率的影响较小.

Research on Dynamic Characteristics of the Large SPan Transmission Tower-line System

In order to obtain the dynamic characteristics of the large span transmisssion system,the finite element models (FEM) of the single transmission line, tower and tower-line system are made. Firstly the numerical results of the single line obtained from FEM are colmpared with the analytical results, which shows there are small differences between them. Then the dynarnic char acteristics of the single tower and tower-line system are calculated. By comparing and analyzing these numerical results, it can be seen that the vibration of the line plays an important role at the lower frequency, and the vibration of the tower has litle effect upon the tower-line system.