An alternative model for on-line quality monitoring for variables

An alternative model for on-line quality monitoring for variables

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Article ID: iaor20082377
Country: Netherlands
Volume: 107
Issue: 1
Start Page Number: 202
End Page Number: 222
Publication Date: Jan 2007
Journal: International Journal of Production Economics
Authors: , ,
Keywords: Taguchi method
Abstract:

An alternative model for an on-line monitoring process for variables is presented in this paper. The characteristic of interest follows a normal distribution and changes of the distribution parameters are described by a two-state Markov chain. Items are produced independently and a single item is examined at every m manufactured items similar to an on-line quality procedure to monitor process for variables previously presented by Taguchi et al. The objective of this study is to determine the optimal sampling interval m and the optimal control limit d that minimizes the expected cost function. A program using S-PLUS was developed to compare Taguchi’s and the alternative proposal. The alternative model provides a better performance than Taguchi’s, since it yields a lower cost and feasible parameters (control limits and sampling interval).

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