摘要
为了分析安装了间隔棒的双分裂导线微风振动强度，研究了利用有限差分法（FDM）分析微风振动的关键技术。基于能量等效原理，将实测的输电线自阻尼功率等效成为粘滞阻尼系数，将输入风功率等效成为微风激励力。推导了分裂导线-间隔棒体系动力微分方程，利用四阶有限差分格式求解动力方程得到导线的最大振幅；根据振幅和曲率的关系推导了输电线动弯应变幅值沿输电线的分布规律。通过某220kV双分裂导线算例分析：未安装间隔棒时，有限差分结果与能量平衡法分析结果吻合较好；安装了间隔棒的情况下，有限差分法能够反应间隔棒刚度、阻尼对分裂导线微风振动的影响，并且可以考虑由于子导线振动差异导致的相互拉扯效应。
Abstract
In order to analyse Aeolian vibration of two-conductors bundle with and without spacers, being differ from the energy balance method (EBM) traditionally, the vertical, steady-state, monofrequent aero-vibration has been researched by the finite difference method (FDM). Based on energy equivalent theory, the conductor self-damping is translate into equivalent viscous damping coefficient; the Aeolian excitation force could be obtained by wind power input function which is measured from wind tunnel experiments. The equation of bundle conductors-spacers system can be deduced by fourth-order finite difference scheme. Finally, the displacement of conductors could be computed by iterative methods. Based on the relationship between amplitude and curvature, the distribution of dynamic bending strain alone the conductor has been obtained. Take 220kV two-conductor bundles as an example; the conductor with and without spacers were computed by EBM model and FDM model respectively. The result of FDM modal is similar with EBM without spacers. That’s proved the FEM modal has the capability to calculate conductor vibration. The spacers’ stiffness and damping can be taking into account by present method. In addition, the effect of interaction between two conductors can be computed by FDM.
关键词
分裂导线 /
微风振动 /
有限差分法 /
能量平衡法 /
间隔棒
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Key words
bundled conductor /
Aeolian vibration /
FDM /
EBM /
spacer
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孔德怡;李黎;龙晓鸿;叶志雄.
安装间隔棒的双分裂导线微风振动分析[J]. 振动与冲击, 2010, 29(1): 138-142
Kong Deyi;Li Li;Long Xiaohong;Ye Zhixiong.
AEOLIAN VIBRATION ANALYSIS OF TWO- CONDUCTORS BUNDLE WITH SPACERS[J]. Journal of Vibration and Shock, 2010, 29(1): 138-142
中图分类号：
TM726.3
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