New damage indices and algorithm based on square time-frequency distribution for damage detection in concrete piers of railroad bridges

2014 ◽  
Vol 22 (1) ◽  
pp. 91-106 ◽  
Author(s):  
H. R. Ahmadi ◽  
F. Daneshjoo ◽  
N. Khaji
Keyword(s):  
Damage Detection ◽  
Frequency Distribution ◽  
Railroad Bridges ◽  
Time Frequency ◽  
Damage Indices ◽  
Time Frequency Distribution

scholarly journals Damage Detection Based on Cross-Term Extraction from Bilinear Time-Frequency Distributions

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Ma Yuchao ◽  
Yan Weiming ◽  
He Haoxiang ◽  
Wang Kai
Keyword(s):  
Damage Detection ◽  
Frequency Distribution ◽  
Structural Damage ◽  
Damage Identification ◽  
Dominant Term ◽  
Cross Term ◽  
Time Frequency ◽  
Structural Damage Identification ◽  
The Cross ◽  
Time Frequency Distribution

Abundant damage information is implicated in the bilinear time-frequency distribution of structural dynamic signals, which could provide effective support for structural damage identification. Signal time-frequency analysis methods are reviewed, and the characters of linear time-frequency distribution and bilinear time-frequency distribution typically represented by the Wigner-Ville distribution are compared. The existence of the cross-term and its application in structural damage detection are demonstrated. A method of extracting the dominant term is proposed, which combines the short-time Fourier spectrum and Wigner-Ville distribution; then two-dimensional time-frequency transformation matrix is constructed and the complete cross-term is extracted finally. The distribution character of which could be applied to the structural damage identification. Through theoretical analysis, model experiment and numerical simulation of the girder structure, the change rate of cross-term amplitude is validated to identify the damage location and degree. The effectiveness of the cross-term of bilinear time-frequency distribution for damage detection is confirmed and the analytical method of damage identification used in structural engineering is available.

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