【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。更多还原

【Abstract】 In order to analyse Aeolian vibration of two-conductor bundle with and without spacers,the vertical, steady-state,monofrequent aero-vibration was studied by using the finite difference method(FDM) which is different from the energy balance method(EBM) used traditionally.Based on energy equivalent theory,the conductor self-damping was changed into equivalent viscous damping coefficient;the Aeolian excitation force could be obtained from wind power input function which was measured in wind tunnel experiments.The dynamic equation of the bundled conductor-spacer system was deduced using a fourth-order finite difference scheme.Finally,the displacement of conductors could be computed by means of iterative methods.Based on the relationship between amplitude and curvature,the distribution of the dynamic bending strain along the conductor was obtained.Taking a 220kV two-conductor bundle as an example the conductor with and without spacers were computed by using EBM model and FDM model,respectively.The results from the FDM model without spacers were similar to those from the EBM model without spacers.It was proved that FDM model has the capability to calculate conductor vibration.The effect of spacers’ stiffness and damping on the Aeolian vibration could be taken into account using the proposed method.In addition,the effect of interaction between two conductors could be computed u- sing FDM.更多还原