Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16553
Title: Damage identification for beams in noisy conditions based on Teager energy operator-wavelet transform modal curvature
Authors: Cao, M
Xu, W
Ostachowicz, W
Su, Z 
Issue Date: 2014
Publisher: Academic Press
Source: Journal of sound and vibration, 2014, v. 333, no. 6, p. 1543-1553 How to cite?
Journal: Journal of sound and vibration 
Abstract: Modal curvatures have been widely used in the detection of structural damage. Attractive features of modal curvature include great sensitivity to damage and instant determination of damage location. However, an intrinsic deficiency in a modal curvature is its susceptibility to the measurement noise present in the displacement mode shape that produces the modal curvature, likely obscuring the features of damage. To address this deficiency, the Teager energy operator together with wavelet transform is tactically utilized to treat modal curvature, producing a new modal curvature, termed the Teager energy operator-wavelet transform modal curvature. This new modal curvature features distinct capabilities of suppressing noise, canceling global trends, and intensifying the singular feature caused by damage for a measured mode shape involving noise. These features maximize the sensitivity to damage and accuracy of damage localization. The proposed modal curvature is demonstrated in several analytical cases of cracked pinned-pinned, clamped-free and clamped-clamped beams, with emphasis on characterizing damage in noisy conditions, and it is further validated by an experimental program using a scanning laser vibrometer to acquire mode shapes of a cracked aluminum beam. The Teager energy operator-wavelet transform modal curvature essentially overcomes the deficiency of conventional modal curvature, providing a new dynamic feature well suited for damage characterization in noisy environments. (The Matlab code for implementing Teager energy operator-wavelet transform modal curvature can be provided by the corresponding author on request.)
URI: http://hdl.handle.net/10397/16553
ISSN: 0022-460X
EISSN: 1095-8568
DOI: 10.1016/j.jsv.2013.11.003
Appears in Collections:Journal/Magazine Article

Access
View full-text via PolyU eLinks SFX Query
Show full item record

SCOPUSTM   
Citations

48
Last Week
0
Last month
3
Citations as of Sep 9, 2017

WEB OF SCIENCETM
Citations

40
Last Week
1
Last month
4
Citations as of Sep 21, 2017

Page view(s)

56
Last Week
1
Last month
Checked on Sep 17, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.