基于单跨六分裂输电输电线气弹模型风洞试验，测得了其不同风速下输电线端部，即输电线传递给输电塔的动张力时程，结合经验模态分解法（EMD）、小波分析及随机减量法（RDT）识别了输电输电线的前四阶气动阻尼比，并将其与基于准定常理论的气动阻尼比进行了对比。考虑气动阻尼的影响，对输电输电线动张力进行了计算。研究结果表明：输电输电线的气动阻尼相对于结构阻尼，占有主导地位，在强风下可以达到结构阻尼的10倍以上；由于输电输电线的风致非线性振动，使得基于准定常理论的气动阻尼与识别结果相比存在显著差异；强风作用下，不考虑气动阻尼的计算结果将严重地高估输电线的风致动张力响应。
Abstract
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.
关键词
风洞试验 /
气弹模型 /
气动阻尼 /
输电输电线 /
风致响应
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Key words
wind tunnel test /
aero-elastic model /
aerodynamic damping /
transmission conductor /
wind-induced response
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