基于交叉证认的EMD小波滤波在大桥动态监测去噪中的应用

吴杰1,胡夏闽2,乔燕1,余腾1,朱绍奇1,马静1

振动与冲击 ›› 2017, Vol. 36 ›› Issue (22) : 212-217.

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (22) : 212-217.
论文

基于交叉证认的EMD小波滤波在大桥动态监测去噪中的应用

  • 吴杰1,胡夏闽2,乔燕1,余腾1,朱绍奇1,马静1
作者信息 +

EMD-wavelet filtering based on cross-validation and its application in bridge dynamic monitoring

  •   WU Jie 1   HU Xia-min 2  QIAO Yan 1  YU Teng 1  ZHU Shao-qi 1  MA Jing 1
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文章历史 +

摘要

在大桥动态位移监测中,为了更好地滤除噪声,提出了一种改进的交叉证认EMD小波滤波方法。即先用EMD对信号进行分解,再用交叉证认方法自适应地算出噪声主导分量,最后用小波阈值对噪声主导分量进行滤波;其中阈值函数选取极为关键,给出了一种新的阈值函数计算方法;最后进行信号重构。实例分析表明,该方法能够更有效地滤除噪声,提取大桥振动信息,是一种高效的去噪方法。

Abstract

In order to filter out noise, an improved EMD-wavelet filtering method based on cross-validation is proposed in the bridge dynamic displacement monitoring. At first the signal is decomposed with the EMD-wavelet method, and then we calculate the dominant component of the noise with cross-validation method adaptively, and finally the dominant component of noise is filtered with the wavelet threshold; It is very critical selecting the function of thresholds, and so this paper proposes a new threshold function calculation method; Finally we reconstruct the signal. Example analysis shows that the method can more effectively filter out noise and puts forward the bridge vibration information, and it is a highly efficient de-noising method.
 

关键词

交叉证认 / EMD小波 / 小波阈值 / 大桥动态监测

Key words

cross-validation / EMD-wavelet / wavelet threshold / bridge dynamic monitoring

引用本文

导出引用
吴杰1,胡夏闽2,乔燕1,余腾1,朱绍奇1,马静1. 基于交叉证认的EMD小波滤波在大桥动态监测去噪中的应用[J]. 振动与冲击, 2017, 36(22): 212-217
WU Jie 1 HU Xia-min 2 QIAO Yan 1 YU Teng 1 ZHU Shao-qi 1 MA Jing 1. EMD-wavelet filtering based on cross-validation and its application in bridge dynamic monitoring[J]. Journal of Vibration and Shock, 2017, 36(22): 212-217

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