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Published in: The International Journal of Advanced Manufacturing Technology 3-4/2022

23-08-2022 | ORIGINAL ARTICLE

How to find the variables causing outliers in a multivariate autocorrelated process control: a study in simulation and an extruder machine

Authors: Renan Mitsuo Ueda, Adriano Mendonça Souza

Published in: The International Journal of Advanced Manufacturing Technology | Issue 3-4/2022

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Abstract

Conventional multivariate control charts (MCCs) have difficulties finding the responsible variable for an outlier in the manufacturing system in which the variables have autocorrelation. This study suggests a promising solution to solve this problem by combining two different techniques: the vector autoregressive (VAR) model and the T2 decomposition method; we also compared this proposal with two other traditional MCCs. This study was guided by the design research methodology, and in order to analyze the feasibility of this proposal, simulations were performed, and a test of the method was made using real data of the operation of an extruder machine. Three variables were monitored in the extrusion process, totaling 769 measurements for each time series. At the end of the study, this proposed method was indicated to find the time series causing the signal outliers: (i) VAR residuals helped better explain the causality between the time series; (ii) the T2 chart effectively indicated the signal outliers; and (iii) the time series causing this variability was found using the T2 decomposition technique.

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Appendix
Available only for authorised users
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Metadata
Title
How to find the variables causing outliers in a multivariate autocorrelated process control: a study in simulation and an extruder machine
Authors
Renan Mitsuo Ueda
Adriano Mendonça Souza
Publication date
23-08-2022
Publisher
Springer London
Published in
The International Journal of Advanced Manufacturing Technology / Issue 3-4/2022
Print ISSN: 0268-3768
Electronic ISSN: 1433-3015
DOI
https://doi.org/10.1007/s00170-022-10000-0

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