基于特征系统实现算法的输电塔气动阻尼风洞试验研究

段成荫 邓洪洲

振动与冲击 ›› 2014, Vol. 33 ›› Issue (21) : 131-136.

PDF(1887 KB)
PDF(1887 KB)
振动与冲击 ›› 2014, Vol. 33 ›› Issue (21) : 131-136.
论文

基于特征系统实现算法的输电塔气动阻尼风洞试验研究

  • 段成荫 邓洪洲
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Wind tunnel investigation on the aerodynamic damping of transmission tower based on eigensystem realization algorithm

  • DUAN Chengyin, DENG Hongzhou
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摘要

为研究输电塔结构环境激励下的气动性能,采用特征系统实现算法(ERA)对风洞试验结果进行模态参数识别,提出表征各阶模态脉冲响应振幅的模态参与因子(MPF)作为识别系统模态的参数,利用各阶模态参与因子和相应的特征值推导了模态能量贡献(MEC)的估算公式,利用模态参与因子和模态能量贡献自动提取系统模态以减小识别中的主观影响。比较了试验结果与准定常理论的异同,讨论了气动阻尼与平均风速和风向的关系。结果表明输电塔结构气动阻尼多为正阻尼,顺风向随风速的增大而增大,横风向基本保持定值且未出现负阻尼,气动阻尼与平均风速分量之间存在非线性关系,因而在准定常理论基础上通过引入高阶项对试验结果进行了拟合。

Abstract

A wind tunnel test is conducted to investigate the aerodynamic behaviour of transmission tower subjected to ambient excitation and the eigensystem realization algorithm is employed in the procedure of modal parameter identification. The concept of modal participation factor (MPF) is introduced, which represents the impulse response amplitude of each mode therefore is an indicator to discriminate system modes from noise. Then the modal energy contribution (MEC) of each mode is evaluated on the basis of MPF as well as corresponding eigenvalue. With the aid of MPF and MEC an auto identification scheme is applied to minimize the subjective influence in modal parameter identification. The experimental results are examined in a variety of wind speeds and wind attack angles and theoretical values derived from quasi-steady assumption are compared as well. The study reveals that the aerodynamic damping ratios of transmission tower are generally positive. The longitudinal aerodynamic damping tends to intensify as the wind speed increases, while in lateral direction no clear trend is observed. There is a nonlinear dependency of aerodynamic damping ratio on mean wind speed therefore the quasi-steady assumption is adjusted by introducing higher-order terms of wind speed.


关键词

输电塔 / 气动阻尼 / 风洞试验 / 特征系统实现算法 / 模态参与因子 / 模态能量贡献

Key words

Transmission tower / aerodynamic damping / wind tunnel test / eigensystem realization algorithm / modal participation factor / modal energy contribution

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导出引用
段成荫 邓洪洲. 基于特征系统实现算法的输电塔气动阻尼风洞试验研究[J]. 振动与冲击, 2014, 33(21): 131-136
DUAN Chengyin;DENG Hongzhou. Wind tunnel investigation on the aerodynamic damping of transmission tower based on eigensystem realization algorithm[J]. Journal of Vibration and Shock, 2014, 33(21): 131-136

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