Economic design of VSI control charts

Duncan considered the design parameters of Shewhart control charts in 1956 based on an economic view-point, and ensured that an economic design control chart actually lowers the cost compared with a Shewhart control chart. His research method has been widely used in subsequent studies on the subject...

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Bibliographic Details
Published in:International journal of production research 2007-12, Vol.45 (23), p.5639-5648
Main Authors: Yu, Fong-Jung, Rahim, M. A., Chin, Hsiang
Format: Article
Language:English
Subjects:
Control charts
Economic design
Economic models
Sampling techniques
SPC
Studies
Variable sampling interval
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Summary:Duncan considered the design parameters of Shewhart control charts in 1956 based on an economic view-point, and ensured that an economic design control chart actually lowers the cost compared with a Shewhart control chart. His research method has been widely used in subsequent studies on the subject and focused on a fixed-sampling interval (FSI). However, it has been discovered that variable-sampling-interval (VSI) control charts are substantially quicker than FSI control charts in detecting shifts in the process. In an earlier study, an economic design of a VSI control chart with a single assignable cause for a continuous flow has been proposed. This research extends a single assignable cause to multiple-assignable causes to construct an economic model of VSI control charts. A numerical example is provided to demonstrate the effectiveness of the proposed model. The result indicates that VSI is more effective than FSI control charts.
ISSN:0020-7543
1366-588X
DOI:10.1080/00207540701325512