"A novel sparse Bayesian learning and its application to fault diagnosi" by Jihoon Chung, Bo Shen et al.
 

A novel sparse Bayesian learning and its application to fault diagnosis for multistation assembly systems

Document Type

Article

Publication Date

1-1-2024

Abstract

This article addresses the problem of fault diagnosis in multistation assembly systems. Fault diagnosis is to identify process faults that cause excessive dimensional variation of the product using dimensional measurements. For such problems, the challenge is solving an underdetermined system caused by a common phenomenon in practice; namely, the number of measurements is less than that of the process errors. To address this challenge, this article attempts to solve the following two problems: (i) how to utilize the temporal correlation in the time series data of each process error and (ii) how to apply prior knowledge regarding which process errors are more likely to be process faults. A novel sparse Bayesian learning method is proposed to achieve the above objectives. The method consists of three hierarchical layers. The first layer has parameterized prior distribution that exploits the temporal correlation of each process error. Furthermore, the second and third layers achieve the prior distribution representing the prior knowledge of process faults. Since posterior distributions of process faults are intractable, this article derives approximate posterior distributions via Variational Bayes inference. Numerical and simulation case studies using an actual autobody assembly process are performed to demonstrate the effectiveness of the proposed method.

Identifier

85153771237 (Scopus)

Publication Title

IISE Transactions

External Full Text Location

https://doi.org/10.1080/24725854.2023.2199813

e-ISSN

24725862

ISSN

24725854

First Page

84

Last Page

97

Issue

1

Volume

56

Grant

N00014-19-1-2728

Fund Ref

U.S. Department of Defense

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