覆冰导线舞动数值解及影响因素分析  

NUMERICAL APPROACH TO THE GALLOP OF ICED CONDUCTOR

作　　者：王昕[1] 楼文娟[1] 

机构地区：[1]浙江大学结构工程研究所,杭州浙江310058

出　　处：《工程力学》2010年第A01期290-293,310,共5页Engineering Mechanics

基　　金：国家自然科学基金重点项目(50638010)

摘　　要：针对覆冰导线大幅度舞动问题,考虑其几何非线性,采用抛物线形函数三节点等参单元建立了导线有限元模型,将绝缘子及相邻跨导线的刚度贡献等效为弹簧单元,同时考虑了来流风载中的脉动成份,运用谐波叠加法对其进行模拟。采用Newmark-β时间积分方法及时间步内Newton-Raphson迭代来求解舞动非线性动力方程,得到了较为精确的覆冰导线舞动时域解,分析了风速、张拉力、湍流以及不同边界条件假定对舞动的影响。A finite element method is presented to analyze the gallop characterized by the high amplitude vibrations of iced transmission line conductors.The iced conductor is modeled by a three-node isoparametric cable element with a parabolic shape function.The insulator strings and remote spans are also modeled as equivalent springs.Besides a steady wind flow,the turbulence is simulated by a harmonic superposition method.A time marching algorithm using Newmark-β method in conjunction with Newton-Raphson iteration is adopted to integrate the dynamic equilibrium equation involving geometric nonlinearities and nonlinear wind loads.The factors influencing the gallop are discussed in detail.

关 键 词：舞动 有限元 湍流 时间积分 输电导线 

分 类 号：TU311.3[建筑科学—结构工程]