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Title:	A frequency-based approach for the detection and classification of structural changes using t-SNE
Author:	Agis Cherta, David; Pozo Montero, Francesc
Other authors:	Universitat Politècnica de Catalunya. Doctorat en Matemàtica Aplicada; Universitat Politècnica de Catalunya. Departament de Matemàtiques; Universitat Politècnica de Catalunya. CoDAlab - Control, Modelització, Identificació i Aplicacions
Abstract:	This work presents a structural health monitoring (SHM) approach for the detection and classification of structural changes. The proposed strategy is based on t-distributed stochastic neighbor embedding (t-SNE), a nonlinear procedure that is able to represent the local structure of high-dimensional data in a low-dimensional space. The steps of the detection and classification procedure are: (i) the data collected are scaled using mean-centered group scaling (MCGS); (ii) then principal component analysis (PCA) is applied to reduce the dimensionality of the data set; (iii) t-SNE is applied to represent the scaled and reduced data as points in a plane defining as many clusters as different structural states; and (iv) the current structure to be diagnosed will be associated with a cluster or structural state based on three strategies: (a) the smallest point-centroid distance; (b) majority voting; and (c) the sum of the inverse distances. The combination of PCA and t-SNE improves the quality of the clusters related to the structural states. The method is evaluated using experimental data from an aluminum plate with four piezoelectric transducers (PZTs). Results are illustrated in frequency domain, and they manifest the high classification accuracy and the strong performance of this method.
Abstract:	Peer Reviewed
Subject(s):	-Àrees temàtiques de la UPC::Matemàtiques i estadística -Àrees temàtiques de la UPC::Enginyeria civil::Materials i estructures -Fracture mechanics -Structural engineering -Embedded computer systems -Classification detection -Principal component analysis (PCA) -Structural changes -Structural health monitoring (SHM) -T-distributed stochastic neighbor embedding (t-SNE) -Mecànica de fractura -Enginyeria d'estructures -Sistemes incrustats (Informàtica)
Rights:	Attribution-NonCommercial-NoDerivs 3.0 Spain http://creativecommons.org/licenses/by-nc-nd/3.0/es/
Document type:	Article - Published version Article
Published by:	Multidisciplinary Digital Publishing Institute (MDPI)
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