Experimental study of single tower self-anchored suspension bridge damage identification based on cross terms of Wigner-Ville distribution

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Journal of Vibration and Shock ›› 2016, Vol. 35 ›› Issue (6) : 161-168.

CHEN Yan-jiang，WANG Kai，MA Yu-chao，HAO Chao-wei

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Abstract

In order to study the effect of damage identification by using the cross terms of Wigner-Ville distribution, a complete extraction of cross terms was explored. Through the derivation of Wigner-Ville distribution of a double cosine signal, the position relationship between main terms and cross terms, the concussion characteristics of them were obtained, then the extraction method was proposed as follow: firstly, the positive and the negative energy of each frequency band in Wigner-Ville distribution were integrated respectively along the time axis; secondly, using the absolute value of negative energy to divide the positive one, through filtering by setting a threshold to get the energy distribution of cross terms; finally, with a project as the research object, by comparing the cross terms energy difference of observation point under undamaged and damaged status to identify the location and extent of damage. The result showed that the cross terms can be used as a damage identification index and the effect is remarkable.

Key words

/ Wigner-Ville distribution；the cross-term；time-frequency analysis；damage index；suspension bridge

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CHEN Yan-jiang，WANG Kai，MA Yu-chao，HAO Chao-wei . Experimental study of single tower self-anchored suspension bridge damage identification based on cross terms of Wigner-Ville distribution[J]. Journal of Vibration and Shock, 2016, 35(6): 161-168

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