覆冰导线舞动数值解及影响因素分析

详细信息

NUMERICAL APPROACH TO THE GALLOP OF ICED CONDUCTOR

(Institute of Structural Engineering of Zhejiang University, Hangzhou, Zhejiang 310058, China)

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。
- 舞动 /
- 有限元 /
- 湍流 /
- 时间积分 /
- 输电导线
Abstract: 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.
- galloping /
- finite element /
- turbulence /
- time integration /
- transmission line conductor