Classification of Multivariate Time Series Data using Machine Learning and System Redundancy Analysis

Elliot Lang

Research output: ThesisMaster's Thesis

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Abstract

This thesis investigates the level of redundancy within batches of sensor data; the explicit goal of which being to evaluate the system's reaction to the inactivity of one or more sensor units. Moreover, this thesis explores the applicability and viability of different machine learning algorithms for classifying the state of the analysed machine based on batches of acceleration data. The redundancy within the data is measured by quantification of the inherent dimensional coverage; based on the result, the data dimensionality can be reduced. Possible permutations of the loss of one or two of the six available sensor units are analysed in the context of the remaining dimensional coverage. This gives an indication of the certainty with which analyses based on the reduced data can be evaluated.
Furthermore, several possible supervised machine learning algorithms, capable of multi-class classification, are identified and their applicability to the labelled data batches is assessed. An array of promising classification methods were identified and applied to each batch of data. The successful classification is quantified by measuring each method's predictive accuracy, the number of correctly identified machine states, and the training time each method requires including the optimization of its hyperparameters.
The results of both of these processes show a robustness to the loss of sensors within the system, independent of spatial location, as well as some promising machine learning classification algorithms, capable of identifying the machine's state.
Translated title of the contributionKlassifizierung von multivariaten Zeitreihendaten mit Hilfe von maschinellem Lernen und Systemredundanzanalyse
Original languageEnglish
QualificationDipl.-Ing.
Awarding Institution
  • Montanuniversität
Supervisors/Advisors
  • O'Leary, Paul, Supervisor (internal)
Award date22 Mar 2024
DOIs
Publication statusPublished - 2024

Bibliographical note

no embargo

Keywords

  • Machine Learning
  • Classification
  • Redundancy
  • Decision Trees
  • Neural Networks
  • Discriminant Analysis
  • k-Nearest Neighbours
  • Ensemble Classification
  • Naive Bayes

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