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| AEOLIAN VIBRATION ANALYSIS OF TWO- CONDUCTORS BUNDLE WITH SPACERS |
| Kong Deyi;Li Li;Long Xiaohong;Ye Zhixiong |
| School of Civil Engineering & Mechanics in Huazhong University of Science and Technology, Wuhan, Hubei Province, 430074 |
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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.
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Received: 21 October 2008
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2010, Vol. 29 
