A study on the effects of damage models and wavelet bases for damage identification and calibration in beams

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Title: A study on the effects of damage models and wavelet bases for damage identification and calibration in beams
Authors: Pakrashi, Vikram
O'Connor, Alan
Basu, Biswajit
Permanent link: http://hdl.handle.net/10197/10496
Date: 28-Jun-2008
Online since: 2019-05-16T10:20:44Z
Abstract: Damage detection and calibration in beams by wavelet analysis involve some key factors such as the damage model, the choice of the wavelet function, the effects of windowing, and the effects of masking due to the presence of noise during measurement. A numerical study has been performed in this article addressing these issues for single and multispan beams with an open crack. The first natural modeshapes of single and multispan beams with an open crack have been simulated considering damage models of different levels of complexity and analyzed for different crack depth ratios and crack positions. Gaussian white noise has been synthetically introduced to the simulated modeshape and the effects of varying signal-to-noise ratio have been studied. A wavelet-based damage identification technique has been found to be simple, efficient, and independent of damage models and wavelet basis functions, once certain conditions regarding the modeshape and the wavelet bases are satisfied. The wavelet-based damage calibration is found to be dependent on a number of factors including damage models and the basis function used in the analysis. A curvature-based calibration is more sensitive than a modeshape-based calibration of the extent of damage.
Type of material: Journal Article
Publisher: Wiley Online Library
Journal: Computer-Aided Civil and Infrastructure Engineering
Volume: 22
Issue: 8
Start page: 555
End page: 569
Copyright (published version): 2007 Computer-Aided Civil and Infrastructure Engineering
Keywords: Damage detectionWavelet analysisDamage modelCurvature-based calibrationModeshape-based calibration
DOI: 10.1111/j.1467-8667.2007.00510.x
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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