Damage identification for beams in noisy conditions based on Teager energy operator-wavelet transform modal curvature

2014 ◽  
Vol 333 (6) ◽  
pp. 1543-1553 ◽  
Author(s):  
Maosen Cao ◽  
Wei Xu ◽  
Wieslaw Ostachowicz ◽  
Zhongqing Su
Keyword(s):  
Wavelet Transform ◽  
Damage Identification ◽  
Energy Operator ◽  
Teager Energy Operator ◽  
Modal Curvature ◽  
Noisy Conditions ◽  
Teager Energy

scholarly journals Baseline-free damage identification of metallic sandwich panels with truss core based on vibration characteristics

2016 ◽  
Vol 16 (1) ◽  
pp. 24-38 ◽  
Author(s):  
Lingling Lu ◽  
Hongwei Song ◽  
Wu Yuan ◽  
Chenguang Huang
Keyword(s):  
Damage Identification ◽  
Damage Index ◽  
Sandwich Panels ◽  
Energy Operator ◽  
Weight Coefficient ◽  
Index Formula ◽  
Flexibility Matrix ◽  
Teager Energy Operator ◽  
Truss Core ◽  
Teager Energy

A baseline-free damage identification method is proposed to identify damages in metallic sandwich panels with truss core in the article. The method is based on flexibility matrix and gapped smoothing method, with damage index defined DIm. The weight coefficient m is introduced to consider the effect of damages on both low-order modes and high-order modes. Numerical simulations and experiments are conducted to evaluate the present method. Besides, damage index [Formula: see text] is also defined by processing DIm with Teager energy operator, and comparisons between DIm and [Formula: see text] are also carried out. Results show that the proposed method is effective in detecting single damage and multiple damages of the same or different extent. The weight coefficient m plays a very important role in identification of multiple damages of different styles. When comparing with [Formula: see text], it is found that the present index DIm is better at suppressing the singularity caused by contact nodes and detecting of multiple damages which contain small or slight damages.

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