An Analytic Variable Limit np Control Chart

The Shewhart np control chart is often used to monitor the quantity of nonconforming, but it is slow in detecting small deviations. This paper proposes an efficient approach to monitor the quantity of nonconforming. The novelty of the paper is utilization of an initial belief to construct an analyti...

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Bibliographic Details
Published inScientia Iranica Transaction E: Industrial Engineering Vol. 17; no. 1; pp. 48 - 57
Main Authors Abooie, M H, Aminnayeri, M
Format Journal Article
LanguageEnglish
Published 01.01.2010
Subjects
Binomials
Charts
Construction
Control charts
Deviation
Mathematical analysis
Monitors
Simulation
Utilization
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Summary:The Shewhart np control chart is often used to monitor the quantity of nonconforming, but it is slow in detecting small deviations. This paper proposes an efficient approach to monitor the quantity of nonconforming. The novelty of the paper is utilization of an initial belief to construct an analytic variable limit np control chart. The proposed method uses all gathered data, sequentially. This approach is significantly faster than some existent effective approaches in detecting small deviations. These charts are mainly used for evaluation of the initial setup in the process. The simulated results for the average run length profiles demonstrate the superiority of the new approach against the standard np chart, binomial CUSUM, binomial EWMA and moving average approach.
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ISSN:1026-3098