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Estimating process capability indices of multivariate nonnormal processes

Abbasi, B ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s00170-010-2557-y
  3. Abstract:
  4. The capability analysis of production processes where there are more than one correlated quality variables is a complicated task. The problem becomes even more difficult when these variables exhibit nonnormal characteristics. In this paper, a new methodology is proposed to estimate process capability indices (PCIs) of multivariate nonnormal processes. In the proposed methodology, the skewness of the marginal probability distributions of the variables is first diminished by a root transformation technique. Then, a Monte Carlo simulation method is employed to estimate the process proportion of nonconformities (PNC). Next, the relationship between PNC and PCI is found, and finally, PCI is estimated using PNC. Several multivariate nonnormal distributions such as Beta, Weibull, and Gamma are taken into account in simulation experiments. A real-world problem is also given to demonstrate the application of the proposed procedure. The results obtained from both the simulation studies and the real-world problem show that the proposed method performs well and is able to estimate PCI properly
  5. Keywords:
  6. Multivariate processes ; Process capability index (PCI) ; Transformation techniques skewness reduction ; Monte Carlo simulation ; Multivariate process ; Nonnormal distribution ; Process capability indices ; Transformation techniques ; Computer simulation ; Cosmic ray detectors ; Estimation ; Industrial engineering ; Interfaces (computer) ; Process control ; Process engineering ; Weibull distribution ; Monte Carlo methods
  7. Source: International Journal of Advanced Manufacturing Technology ; Volume 50, Issue 5-8 , 2010 , Pages 823-830 ; 02683768 (ISSN)
  8. URL: http://link.springer.com/article/10.1007/s00170-010-2557-y