【作者】 王昕； 楼文娟；

【Author】 ~*Wang Xin,Lou Wen-Juan (Institute of Structural Engineering of Zhejiang University,Hangzhou Zhejiang 310058)

【机构】 浙江大学结构工程研究所；

【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。更多还原

【Abstract】 A finite element method is presented to analyze galloping which is characterized by high amplitude vibrations of iced transmission line conductors.The iced conductor is modeled by a three-node, isoparametric cable element with parabolic shape function.Insulator strings and remote spans are also modeled as equivalent springs.Besides steady wind flow,the turbulence is simulated by harmonic superposition method.A time marching algorithm using Newmark-βmethod in conjunction with Newton-Raphson iteration is utilized to integrate dynamic equilibrium equation involving geometric nonlinearities and nonlinear wind load.Factors influencing galloping are discussed in detailed.更多还原