Application of combined wavelet and ICA on strain damage identification in hydraulic structure

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (11) : 180-185.

ZHANG Jian-wei，BAO Zhen-lei，JIANG Qi

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Abstract

In view of the problem that the modal parameters of structure under environmental excitation extracted difficultly, a kind of combined wavelet threshold and Independent Component Analysis (ICA) modal parameter identification method of hydraulic structure is proposed. Firstly a part of noises were filtered out with wavelet threshold, which can reduce the environmental excitation response to each component of independence and make it meet the ICA separation assumption; Then identifying structural modal parameters by using ICA, damage identification of hydraulic structure obtained through the contrast of the strain modal parameters under different working conditions. It is used in cantilever beam model test under the current excitation. The results show that, combined wavelet threshold and ICA can effectively identify modal parameters of the hydraulic structure, the difference of which can identify structure whether there is any damage. This proposed method can effectively solve the problem of modal parameter identification for large hydraulic structure under the environmental excitation, which has a broad prospect in providing the reference for safe operation and on-line monitoring of structure.

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ambient excitation / hydraulic structure / wavelet analysis / Independent Component Analysis / damage identification

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ZHANG Jian-wei，BAO Zhen-lei，JIANG Qi. Application of combined wavelet and ICA on strain damage identification in hydraulic structure[J]. Journal of Vibration and Shock, 2016, 35(11): 180-185

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