Based on aero-elastic model wind tunnel tests of single-span six-bundled transmission conductor, time series of dynamic tensions at the end of the conductor under various wind speeds, namely the force transmitted to the tower, were measured by the force balances. Through the dynamic tensions, the first four modal aerodynamic damping ratios were evaluated by combining the empirical mode decomposition (EMD) method, wavelet analysis and random decrement technology (RDT), and the results were compared with those obtained by quasi-steady theory. Then, considering the effects of aerodynamic damping, wind-induced responses were calculated. The results illustrated that aerodynamic damping is dominant relative to the structural damping, which maybe reach more than ten times of structural damping; due to the wind-induced nonlinear vibration of the conductor, the discrepancy of aerodynamic damping obtained by wind tunnel test and quasi-steady theory is significant; wind-induced dynamic tensions of transmission conductor under strong wind would be overestimated seriously without considering the aerodynamic damping.
Key words
wind tunnel test /
aero-elastic model /
aerodynamic damping /
transmission conductor /
wind-induced response
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