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Damage Detection Using Principal Component Analysis Based on Wavelet Ridges

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Abstract:

Principal Component Analysis (PCA) and Wavelet Transform (WT) aretwo well-known signal processing tools that are widely used indifferent fields. PCA playsa vital role in statistical analysis as a dimensional reduction tool. Besides, WT has proven its abilityto overcome many of the limitation of the others among various time-frequencyanalyzers. The present work attempts to use the properties and advantagesof both methodologies together in damage detection. To achieve thisaim, PCA is applied on ridges of wavelet transform of measured signalsfrom the structure. The results show that the proposed combination improvesthe accuracy of detection comparing with PCA damage detection basedon original data captured from sensors. According to the result, when PCA uses the ridges of transformed data, theidentifications of damages are more clear and accurate. This work involvesexperiments with an aluminum beam using piezoelectrictransducers as sensors and actuators. Damages are introduced intothe structure as a cut in several steps enlarging the depthof cut.

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Periodical:

Key Engineering Materials (Volumes 569-570)

Pages:

916-923

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.569-570.916

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Online since:

July 2013

Authors:

Fahit Gharibnezhad, Luis Eduardo Mujica, José Rodellar, Claus Peter Fritzen

Keywords:

Damage Detection, Principal Component Analysis (PCA), Wavelet, Wavelet Ridge

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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References

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