脉动风激励下格构式输电塔动力特征识别

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (21) : 144-149.

论文

脉动风激励下格构式输电塔动力特征识别

杨风利1，张宏杰1，杨靖波2，华旭刚3，温青3，牛华伟3

作者信息 +

Identification of Dynamic Properties of a Transmission Line Lattice Tower from Ambient Excitations

YANG Fengli,1 ZHANG Hongjie,1 YANG Jingbo,2 HUA Xugang,3 WEN Qin,3 NIU Huawei,3

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摘要

准确获得模态特征是输电塔抗风抗震等动力响应分析的关键，其中阻尼参数识别尤为重要。本文以一基85.5m高的输电塔为背景，对输电塔的动力特性参数识别进行了研究。根据脉动风作用下实测加速度响应特征，假设信号分段平稳，采用随机子空间法识别了该塔的频率和阻尼比特征。研究结果表明：该输电塔一阶横线向和顺线向模态阻尼比大于2%，而一阶扭转模态阻尼比仅为1%；在加速度不高于0.1m/s2的小振幅振动范围内，阻尼比基本上与振幅无关，识别结果为小振幅下的结构固有阻尼。

Abstract

Accurate determination of modal parameters is crucial to predict the dynamic responses of transmission towers due to wind and seismic excitation, in particular the damping ratio. In this study, the frequencies and damping ratios of an 85.5m-high transmission line tower are identified. Based on the field measured data, the acceleration is assumed to stationary. And the first cross-line mode, along-line mode and torsional mode are estimated by stochastic subspace identification (SSI) from the field testing data. The results indicate that: the damping ratio is slightly larger than 2% for the first cross-line mode and along-line mode and is about 1% for the first torsional mode; the frequencies and damping ratios have little connection with the small vibration amplitudes when the acceleration is not higher than 0.1m/s2, which are can be regarded as the structural damping inherent to the structure.

导出引用

杨风利1，张宏杰1，杨靖波2，华旭刚3，温青3，牛华伟3. 脉动风激励下格构式输电塔动力特征识别[J]. 振动与冲击, 2017, 36(21): 144-149

YANG Fengli,1 ZHANG Hongjie,1 YANG Jingbo,2 HUA Xugang,3 WEN Qin,3 NIU Huawei,3. Identification of Dynamic Properties of a Transmission Line Lattice Tower from Ambient Excitations[J]. Journal of Vibration and Shock, 2017, 36(21): 144-149

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