A multi–modal unsupervised fault detection system based on power signals and thermal imaging via deep AutoEncoder neural network

In this paper a multi-modal unsupervised Deep Learning based algorithm for fault detection is proposed. Such method is applied to real data from a testing procedure implemented on an industrial production line. Both thermal images and current and power measurements coming from industrial refrigerato...

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Veröffentlicht in:Engineering applications of artificial intelligence Jg. 110; S. 104729
Hauptverfasser: Cordoni, Francesco, Bacchiega, Gianluca, Bondani, Giulio, Radu, Robert, Muradore, Riccardo
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier Ltd 01.04.2022
Schlagworte:
Auto-encoder neural network
Deep convolutional neural network
Deep Learning
Fault detection and isolation
Neural networks
Predictive maintenance
Thermal camera
Unsupervised learning
Neural networks
Fault detection and isolation
Auto-encoder neural network
Deep convolutional neural network
Deep Learning
Unsupervised learning
Thermal camera
Predictive maintenance
ISSN:0952-1976, 1873-6769
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Zusammenfassung:In this paper a multi-modal unsupervised Deep Learning based algorithm for fault detection is proposed. Such method is applied to real data from a testing procedure implemented on an industrial production line. Both thermal images and current and power measurements coming from industrial refrigerators are collected. The considered dataset is highly unbalanced with the vast majority of samples being healthy. Thermal images are processed via a Deep Convolutional neural network. The features extracted from the thermal images are thus merged to structured data of power, current and temperature. Therefore, a Deep Auto-Encoder is trained on the dataset to signal anomalies corresponding to faults in the refrigerators. Three different methods are trained and compared: (1) an automatic method in which an expert extracts relevant features from thermal images without using the image recognition module; (2) a semi-automatic method where the convolutional neural network is applied to regions of interest within the thermal images selected by an expert operator; (3) a fully automatic method in which the Deep convolutional network processes the whole thermal image without any human intervention. The three methods show comparable results with nevertheless slight differences.
ISSN:0952-1976
1873-6769
DOI:10.1016/j.engappai.2022.104729