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Modified multivariate process capability index using principal component analysis

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Abstract

The existing research of process capability indices of multiple quality characteristics mainly focuses on nonconforming of process output, the concept development of univariate process capability indices, quality loss function and various comprehensive evaluation methods. The multivariate complexity increases the computation difficulty of multivariate process capability indices(MPCI), which makes them hard to be used in practice. In this paper, a new PCA-based MPCI approach is proposed to assess the production capability of the processes that involve multiple product quality characteristics. This approach first transforms the original quality variables into standardized normal variables. MPCI measures are then provided based on the Taam index. Moreover, the statistical properties of these MPCIs, such as confidence intervals and lower confidence bound, are given to let the practitioners understand the capability indices as random variables instead of deterministic variables. A real manufacturing data set and a synthetic data set are used to demonstrate the effectiveness of the proposed method. An implementation procedure is also provided for quality engineers to apply our MPCI approach in their manufacturing processes. The case studies demonstrate the effectiveness and feasibility of this new kind of MPCI, which is easier to be used in production practice. The proposed research provides a novel approach of MPCI calculation.

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Correspondence to Shuguang He.

Additional information

This project is supported by National Natural Science Foundation of China(Grant Nos. 70802043, 71225006 and 71002105)

ZHANG Min, born in 1979, is an associate professor at Department of Industrial Engineering, Tianjin University, China. She received her PhD degree in management science and engineering from Tianjin University, China, in 2006, and her MS and BS degrees in material engineering from Shandong University, China, in 2003 and 2000. Her research interests focus on quality engineering, statistical quality control and process monitoring application.

WANG G Alan, born in 1973, is an associate professor at Business Information Technology, Virginia Tech, USA. He received his PhD degree in management information systems from University of Arizona, USA, in 2006 and MS degree in industrial engineering from Louisiana State University, China, in 2001. His research interests include quality engineering and data mining. His publications have appeared in Decision Support Systems, IEEE Transactions on Systems, Man and Cybernetics(Part B), IEEE Computer, and Communications of the ACM.

HE Shuguang, born in 1975, is a professor at School of Management, Tianjin University, China. He received his PhD degree in 2002 and MS degree in 2000 from Tianjin University, China. His research interests include statistical process control and quality control using machine learning.

HE Zhen, born in 1967, is a professor at Department of Industrial Engineering, Tianjin University, China. He received his PhD degree in management science from Tianjin University, China, in 2002. His research interests include quality engineering, and six sigma management. His research appears in Total Quality Management and Business Excellence, Quality Progress, European Journal of Operational Research, Journal of Applied Statistics, Quality and Reliability Engineering International, Asian Journal on Quality, etc.

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Zhang, M., Wang, G.A., He, S. et al. Modified multivariate process capability index using principal component analysis. Chin. J. Mech. Eng. 27, 249–259 (2014). https://doi.org/10.3901/CJME.2014.02.249

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  • DOI: https://doi.org/10.3901/CJME.2014.02.249

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