基于现场实测临海地区特大型冷却塔风振响应非平稳特性研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (10) : 206-214.

论文

王浩，柯世堂

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Research on non-stationary characteristics of wind-induced vibration of extra-large cooling tower in coastal area based on field measurements

WANG Hao,KE Shitang

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摘要

忽视特大型冷却塔风振响应的非平稳特征可能会导致对结构响应极值的估算偏差和风振作用特性的错误理解。为此，以某沿海地区特大型冷却塔（高190 m）为研究对象，通过现场实测获取了超高雷诺数和真实湍流条件下特大型冷却塔的风振响应信号；在对实测信号进行降噪滤波处理后进行了不同时距的信号非平稳识别，并分别基于平稳分析模型和非平稳分析模型对特大型冷却塔的响应统计值、峰值因子和极值响应进行对比研究。研究结果表明：临海地区特大型冷却塔风振响应表现出较强的非平稳性，部分响应信号的“大偏斜”或“高峰态”现象是由非平稳特征引起，采用非平稳模型可以更有效地判别信号的真实非高斯特征；此外，响应峰值因子普遍大于3.5，忽视非平稳特性将导致极值估计的缺陷，既无法提供足够的保证率，又降低了响应极值计算结果的经济性。

Abstract

For the extra-large cooling tower, it might cause estimation error of extreme response and misunderstanding on wind-induced effect if nonstationarity of wind-induced response is neglected.In this study, wind-induced response signals of an extra-large cooling tower (height=190 m) in coastal region under real Reynolds number and turbulent flow were acquired based field measurement.Nonstationarity of signals was identified under different time intervals after noise reduction.Statistics of wind-induced response, dynamic amplification factor and extreme response of the extra-large cooling tower were studied based on stationary model and non-stationary model.It is found that: wind-induced response of extra-large cooling tower in coastal area exhibit prominent non-Gaussian feature.Some large skewness phenomenon or high kurtosis phenomenon of probability density distribution of response are caused by effect of nonstationarity.The non-stationary analysis model can discriminate realistic non-Gaussian features of signals more effectively.Besides, the peak factors of extra-large cooling tower are generally higher than 3.5.Neglecting the non-stationary characteristics will lead to the defect of extremum estimation, which can neither provide sufficient guarantee rate,nor increase the economic efficiency of extreme response estimation.

导出引用

王浩，柯世堂. 基于现场实测临海地区特大型冷却塔风振响应非平稳特性研究[J]. 振动与冲击, 2020, 39(10): 206-214

WANG Hao,KE Shitang. Research on non-stationary characteristics of wind-induced vibration of extra-large cooling tower in coastal area based on field measurements[J]. Journal of Vibration and Shock, 2020, 39(10): 206-214

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