Process Targeting for Optimal Capability when the Product is Subject to Degradation

Veevers Alan and Sparks Ross
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Veevers Alan: CSIRO Mathematical and Information Sciences, Private Bag 10, Clayton South MDC, Vic 3169, Australia. Alan.Veevers@csiro.au
Sparks Ross: CSIRO Mathematical and Information Sciences, Locked Bag 17, North Ryde, NSW 1670, Australia. Ross.Sparks@csiro.au

Stochastics and Quality Control, 2002, vol. 17, issue 1, 23-38

Abstract: A performance capability measure is proposed that is useful in a wide class of production processes. Traditional quality improvement methodologies concentrate on getting the process right in order to meet the capability requirements of the product immediately after production, as measured for a key quality characteristic by one of the popular capability indexes. This is not the best strategy when the characteristic degrades over time in use. The implications of this type of degradation on targeting the production process are investigated and illustrated for five typical degradation models. A method is given which enables the optimum settings for the target values of the process mean and standard deviation to be chosen, given a particular model for product degradation. Commonly used philosophies which advocate targeting at the centre of the specification range are shown to be sub-optimal. A useful consequence of better targeting practice is that warranty periods can be extended without increasing the costs associated with supporting warranty claims.

Keywords: Production process; product capability; performance capability; degradation model; optimal targeting; warranty period (search for similar items in EconPapers)
Date: 2002
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DOI: 10.1515/EQC.2002.23

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