Economical operation of (x̄, s) control chart indexed by Taguchi's loss function

Jun'ichi Kobayashi, Ikuo Arizono, Y. Takemoto

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Assume that lot quality characteristics obey a normal distribution. Kanagawa et al. have proposed the (x̄, s) control chart which enable the user to monitor both changes of the mean and variance simultaneously. Further, the results of Watakabe and Arizono enable the user to evaluate the performance for out-of-control state in the case of using the (x̄, s) control chart. On the other hand, Taguchi has presented an approach to quality improvement in which reduction of deviation from the target value is the guiding principle. In this approach, the loss is expressed as a quadratic form with respect to the difference between the measured value x of a product characteristic X and the target value T of a product quality characteristic. Then, we can evaluate the process quality based on the Taguchi's loss criterion. We consider here the economical operation of the (x̄, s) control chart in conformity with the expected total operation cost function based on the sampling cost and the loss due to derivation in the process quality. First, we consider the economical operation of the (x̄, s) control chart in the situation that the loss to be considered is known. Further, the economical operation of the (x̄, s) control chart is also discussed under any loss instead of a known loss. Then, the relationship between the two economical operations proposed here corresponds to the relationship between the lot tolerance per cent defective plans under the fixed fraction defective and the average outgoing quality limit plans under any fraction defective in rectifying inspection plans.

Original languageEnglish
Pages (from-to)1115-1132
Number of pages18
JournalInternational Journal of Production Research
Volume41
Issue number6
DOIs
Publication statusPublished - Apr 15 2003
Externally publishedYes

Fingerprint

Normal distribution
Cost functions
Control charts
Taguchi loss function
Inspection
Sampling
Costs
Quality characteristics
Process quality
Product quality
Product characteristics
Conformity
Tolerance
Cost function
Quality improvement
Deviation

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Management Science and Operations Research

Cite this

Economical operation of (x̄, s) control chart indexed by Taguchi's loss function. / Kobayashi, Jun'ichi; Arizono, Ikuo; Takemoto, Y.

In: International Journal of Production Research, Vol. 41, No. 6, 15.04.2003, p. 1115-1132.

Research output: Contribution to journalArticle

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