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Supervised Distributed Multi-Instance and Unsupervised Single-Instance Autoencoder Machine Learning for Damage Diagnostics with High-Dimensional Data—A Hybrid Approach and Comparison Study

1
Department Mathematics & Computer Science, University of Bremen, 28359 Bremen, Germany
2
German Aerospace Center (DLR e. V.), Institute of Composite Structures and Adaptive Systems, 38108 Braunschweig, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Paolo Bellavista
Computers 2021, 10(3), 34; https://doi.org/10.3390/computers10030034
Received: 30 December 2020 / Revised: 28 February 2021 / Accepted: 2 March 2021 / Published: 18 March 2021
Structural health monitoring (SHM) is a promising technique for in-service inspection of technical structures in a broad field of applications in order to reduce maintenance efforts as well as the overall structural weight. SHM is basically an inverse problem deriving physical properties such as damages or material inhomogeneity (target features) from sensor data. Often models defining the relationship between predictable features and sensors are required but not available. The main objective of this work is the investigation of model-free distributed machine learning (DML) for damage diagnostics under resource and failure constraints by using multi-instance ensemble and model fusion strategies and featuring improved scaling and stability compared with centralised single-instance approaches. The diagnostic system delivers two features: A binary damage classification (damaged or non-damaged) and an estimation of the spatial damage position in case of a damaged structure. The proposed damage diagnostics architecture should be able to be used in low-resource sensor networks with soft real-time capabilities. Two different machine learning methodologies and architectures are evaluated and compared posing low- and high-resolution sensor processing for low- and high-resolution damage diagnostics, i.e., a dedicated supervised trained low-resource and an unsupervised trained high-resource deep learning approach, respectively. In both architectures state-based recurrent artificial neural networks are used that process spatially and time-resolved sensor data from experimental ultrasonic guided wave measurements of a hybrid material (carbon fibre laminate) plate with pseudo defects. Finally, both architectures can be fused to a hybrid architecture with improved damage detection accuracy and reliability. An extensive evaluation of the damage prediction by both systems shows high reliability and accuracy of damage detection and localisation, even by the distributed multi-instance architecture with a resolution in the order of the sensor distance. View Full-Text
Keywords: structural health monitoring; distributed sensor networks; distributed machine learning; model fusion; autoencoder learning structural health monitoring; distributed sensor networks; distributed machine learning; model fusion; autoencoder learning
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MDPI and ACS Style

Bosse, S.; Weiss, D.; Schmidt, D. Supervised Distributed Multi-Instance and Unsupervised Single-Instance Autoencoder Machine Learning for Damage Diagnostics with High-Dimensional Data—A Hybrid Approach and Comparison Study. Computers 2021, 10, 34. https://doi.org/10.3390/computers10030034

AMA Style

Bosse S, Weiss D, Schmidt D. Supervised Distributed Multi-Instance and Unsupervised Single-Instance Autoencoder Machine Learning for Damage Diagnostics with High-Dimensional Data—A Hybrid Approach and Comparison Study. Computers. 2021; 10(3):34. https://doi.org/10.3390/computers10030034

Chicago/Turabian Style

Bosse, Stefan, Dennis Weiss, and Daniel Schmidt. 2021. "Supervised Distributed Multi-Instance and Unsupervised Single-Instance Autoencoder Machine Learning for Damage Diagnostics with High-Dimensional Data—A Hybrid Approach and Comparison Study" Computers 10, no. 3: 34. https://doi.org/10.3390/computers10030034

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