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Sensors 2018, 18(9), 2955; https://doi.org/10.3390/s18092955

A New Structural Health Monitoring Strategy Based on PZT Sensors and Convolutional Neural Network

1
Department of Electrical and Electronic, Mato Grosso Federal Institute of Technology, Cuiabá 78005-200, Brazil
2
São Paulo State University (UNESP), Campus of São João da Boa Vista, São Paulo 13876-750, Brazil
*
Author to whom correspondence should be addressed.
Received: 6 August 2018 / Revised: 31 August 2018 / Accepted: 2 September 2018 / Published: 5 September 2018
(This article belongs to the Special Issue Piezoelectric Transducers: Advances in Structural Health Monitoring)
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Abstract

Preliminaries convolutional neural network (CNN) applications have recently emerged in structural health monitoring (SHM) systems focusing mostly on vibration analysis. However, the SHM literature shows clearly that there is a lack of application regarding the combination of PZT-(lead zirconate titanate) based method and CNN. Likewise, applications using CNN along with the electromechanical impedance (EMI) technique applied to SHM systems are rare. To encourage this combination, an innovative SHM solution through the combination of the EMI-PZT and CNN is presented here. To accomplish this, the EMI signature is split into several parts followed by computing the Euclidean distances among them to form a RGB (red, green and blue) frame. As a result, we introduce a dataset formed from the EMI-PZT signals of 720 frames, encompassing a total of four types of structural conditions for each PZT. In a case study, the CNN-based method was experimentally evaluated using three PZTs glued onto an aluminum plate. The results reveal an effective pattern classification; yielding a 100% hit rate which outperforms other SHM approaches. Furthermore, the method needs only a small dataset for training the CNN, providing several advantages for industrial applications. View Full-Text
Keywords: SHM; electromechanical impedance; piezoelectricity; intelligent fault diagnosis; machine learning; CNN; deep learning SHM; electromechanical impedance; piezoelectricity; intelligent fault diagnosis; machine learning; CNN; deep learning
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de Oliveira, M.A.; Monteiro, A.V.; Vieira Filho, J. A New Structural Health Monitoring Strategy Based on PZT Sensors and Convolutional Neural Network. Sensors 2018, 18, 2955.

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