Recognition of Concurrent Control Chart Patterns in Autocorrelated Processes Using Support Vector Machine

  • Chau-Chen Torng
  • Chon-How Hwang

Abstract

Control chart pattern recognition (CCPR) is an important issue in statistical process control because unnatural control chart patterns (CCPs) exhibited on control charts can be associated with specific causes that adversely affect the manufacturing processes. In recent years, many machine learning techniques have been successfully applied to CCPR. However, such existing research for CCPR has mostly been developed for identification of basic CCPs (Shift Patterns, Trend Patterns, Cyclic Pattern and Systematic Pattern). Little attention has been given to the identification of concurrent CCPs (two or more basic CCPs occurring simultaneously) which are commonly encountered in practical manufacturing processes. In addition, these existing researches also assume the process data are independently and identically distributed which may not be appropriate for certain manufacturing processes. This study proposes a support vector machine (SVM) approach to identify concurrent CCPsfor a multivariate process with autocorrelated observations which can be characterized by afirst order autoregressive (AR(1)) model. The numerical results indicate that the proposed model can effectively identify two concurrent identical CCPs but for those cases involving one trend pattern and one shift pattern, their recognition accuracy deteriorates to around 20% to 50% depending on the autocorrelation coefficients used in the data model.

References

W. Hachicha and A. Ghorbel, “A survey of control-chart pattern-recognition literature (1991–2010) based on a new conceptual classification scheme,” Computers & Industrial Engineering, vol. 63, no. 1, pp.204-222, 2012.

L.J. Xie, N. Gu, D.L. Li, and Z.Q. Cao, “Concurrent control chart patterns recognition with singular spectrum analysis and support vector machine,” Computers & Industrial Engineering, vol. 64, no. 1, pp. 280-289, 2013.

W. A. Yang, W. Zhou, W. Liao, and Y. Guo, “Identification and quantification of concurrent control chart patterns using extreme-point symmetric mode decomposition and extreme learning machines,” Neurocomputing, vol. 147, pp. 260-270, 2015.

R. S. Guhand J. Tannock, “Recognition of control chart concurrent patterns using a neural network approach,”International Journal of Production Research, vol. 37, no.8, pp.1743-1765, 1999.

Published
2016-08-01
How to Cite
Torng, C.-C., & Hwang, C.-H. (2016). Recognition of Concurrent Control Chart Patterns in Autocorrelated Processes Using Support Vector Machine. Proceedings of Engineering and Technology Innovation, 3, 22-24. Retrieved from http://ojs.imeti.org/index.php/PETI/article/view/235
Section
Articles