A de-noising method for vibration signal of flood discharge structure

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (20) : 179-184.

ZHANG Jian-wei，JIANG Qi，ZHAO Yu，ZHU Liang-huan，GUO Jia

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Abstract

In view of the problem that useful characteristics of flood discharge structure vibration signal with low signal to noise ratio which extracted difficultly, a novel de-noising method, which combines wavelet threshold and empirical mode decomposition (EMD), was proposed. Firstly a part of white noises were filtered out with wavelet threshold method, which can reduce the endpoint effect of EMD; then decomposing the signal with EMD, obtained a series of intrinsic mode functions (IMF) which contains real physical meaning; finally reconstructed the IMF of characteristic information to achieve the de-noised signal through spectrum analysis. Constructing the simulation signal, and comparing the filtering effect of this method with digital filter, wavelet threshold and EMD, study shows that, it is a superior de-noising method, which can filter the vibration noise of flood discharge structure accurately and retain the characteristic information. It is used in Laxiwa arch dam hydro-elastic model, analyzing the dominate frequency of dam structure precisely, which can provide the basis for safe operation and on-line monitoring of the dam structure. This proposed method can effectively solve the problem of structure information extraction for large flood discharge structure under the background with strong noise.

Key words

flood discharge structure / vibration signal / low signal to noise ratio / combined wavelet threshold and EMD / dominate frequency

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ZHANG Jian-wei，JIANG Qi，ZHAO Yu，ZHU Liang-huan，GUO Jia. A de-noising method for vibration signal of flood discharge structure[J]. Journal of Vibration and Shock, 2015, 34(20): 179-184

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