基于SYM小波的多点风压信号预处理方法及其应用

段旻 谢壮宁 李小康

振动与冲击 ›› 2013, Vol. 32 ›› Issue (3) : 50-55.

PDF(1983 KB)
PDF(1983 KB)
振动与冲击 ›› 2013, Vol. 32 ›› Issue (3) : 50-55.
论文

基于SYM小波的多点风压信号预处理方法及其应用

  • 段旻1 谢壮宁2 李小康2
作者信息 +

Multi-point Wind Pressure Signal Preprocessing Approach Based on the SYM Wavelet and Its Applications

  • DUAN Min1,XIE Zhuangning2,LI Xiaokang2
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文章历史 +

摘要

本文在对几类小波基的降噪效果进行分析的基础上,确定了一种小波降噪方案,将其应用到典型大跨与高层结构风洞试验同步测压信号的预处理,分析了仪器噪声对极值风压、风致位移和加速度响应计算结果的影响。结果表明:symN小波为风压信号预处理的最优小波基,通过调整其消失矩阶数可以分别获得不同信噪比信号的最佳降噪效果。对于一体育场屋盖,仪器噪声对最大峰值负压估计的影响较小,但会不同程度地高估大跨度屋盖结构的位移响应,仪器噪声会使得位移的共振和背景分量分别被高估7.69%和70.6%,并最终使总响应被高估16.96%。对于某439m高的超高层建筑结构,较长重现期风速作用下结构风致响应的计算受仪器噪声影响相对较小;但对于较短重现期风速来说,噪声对建筑顶部峰值加速度响应估算的影响依然不容忽视,采用有效的减噪措施可以提高风致峰值加速度的估算精度。

Abstract

Wavelet based de-noising method is proposed for processing wind pressure signals of wind tunnel models of large span roof structures and tall buildings by the synchronous multi-pressure measurement technique on the basis of the effectiveness verification and comparison on the de-noising effects of several types of wavelets. The effects of the instrumental noise on the calculation of extreme wind pressure, wind induced deflection and acceleration are analyzed. The results show that the symN are the best wavelets for preprocessing of the wind pressure signals, and best de-noising effects could be obtained by using different vanishing moments. For a large stadium roof structure, the instrumental noise affects the estimation of the extreme wind pressure slightly, but calculation of wind induced response seriously. Instrumental noise could result the background and resonant components be over-estimated by 7.69% and 70.6% respectively, and this finally makes the total deflection be over-estimated by 16.96%. For a 439 m high tall building, the results illustrate that the effects of the instrumental noise on the calculation of wind induced response can be negligible at longer return period wind speed. However, for shorter return period wind speed, the effects of instrumental noise on estimation of the peak acceleration at the top of the buil

关键词

小波降噪 / 仪器噪声 / 大跨结构 / 超高层结构 / 风洞试验

Key words

wavelet de-noising / instrumental noise / long-span structure / super tall building / wind tunnel test

引用本文

导出引用
段旻 谢壮宁 李小康. 基于SYM小波的多点风压信号预处理方法及其应用[J]. 振动与冲击, 2013, 32(3): 50-55
DUAN Min;XIE Zhuangning;LI Xiaokang. Multi-point Wind Pressure Signal Preprocessing Approach Based on the SYM Wavelet and Its Applications[J]. Journal of Vibration and Shock, 2013, 32(3): 50-55

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