基于EEMD分解的输电塔阻尼特性识别

沈国辉;项国通;邢月龙;郭勇;孙炳楠

振动与冲击 ›› 2014, Vol. 33 ›› Issue (21) : 38-43.

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (21) : 38-43.
论文

基于EEMD分解的输电塔阻尼特性识别

  • 沈国辉1, 项国通2, 邢月龙3, 郭勇3, 孙炳楠1
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Identification of damping characteristics of transmission towers using EEMD

  • SHEN Guo-hui1, XIANG Guo-tong2, XING Yue-long3, GUO Yong3, SUN Bing-nan1
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摘要

针对输电塔阻尼特性识别问题,采用EMD和EEMD方法分解输电塔气弹模型试验的加速度时程以得到IMF模态,运用EEMD方法、改进的随机减量法和Hilbert变换法识别输电塔在各风速风向下的频率和阻尼,并探讨阻尼在顺线方向和横线方向随风速变化的分布特点。研究发现,基于EEMD方法比基于EMD方法分解的IMF时程振荡模态更清晰,基于EMD方法的结果存在着一定程度的模态混叠;输电塔顺线向频率随着风速的增大而呈减小趋势,顺线向阻尼随着风速的增大呈单调增加趋势,而横线向阻尼随风速变化的规律性不明显。

Abstract

In order to identify the damping characteristics of transmission towers, Empirical Mode Decomposition (EMD) and Ensemble Empirical Mode Decomposition (EEMD) were employed to obtain Intrinsic Mode Functions (IMFs) of time histories of accelerations obtained from aero-elastic wind tunnel tests of transmission tower. The frequency and damping of the tower under various wind velocities and wind azimuths were identified using EEMD, improved Random Decrement Technique (RDT) and Hilbert transformer. The distribution characteristics of damping along with wind velocities in the along-line direction and in the cross-line direction were also investigated. Results show that the vibrating modes of IMFs obtained from EEMD are much clearer than those obtained from EMD. Furthermore, the mode mixing problem is still existed to some extend in the IMFs obtained from EMD. Totally speaking, the natural vibrating frequency of the tower in the along-line direction decreases with the increase of the wind velocity, whereas the natural vibrating frequency in the cross-line direction increases with the increase of the velocity. However, the trend of damping in the cross-line direction with respect to wind velocity is not obvious.

关键词

输电塔 / 阻尼 / 风洞试验 / 气弹模型 / EEMD

Key words

transmission tower / damping / wind tunnel test / aero-elastic model / EEMD

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导出引用
沈国辉;项国通;邢月龙;郭勇;孙炳楠. 基于EEMD分解的输电塔阻尼特性识别[J]. 振动与冲击, 2014, 33(21): 38-43
SHEN Guo-hui;XIANG Guo-tong;XING Yue-long;GUO Yong;SUN Bing-nan. Identification of damping characteristics of transmission towers using EEMD [J]. Journal of Vibration and Shock, 2014, 33(21): 38-43

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