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https://prod.org.br/article/doi/10.1590/S0103-65132003000100004
Production
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Um índice de capacidade para especificações unilaterais

Process capability index for one-sided specification limit

Barriga, Gladys D. C.; Ho, Linda Lee; Borges, Wagner Sousa

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Resumo

Nos últimos anos, índices de capacidade de processos têm sido usados freqüentemente para determinar se um processo é capaz de produzir itens em conformidade com a tolerância especificada. No entanto, poucos estudos têm sido feitos acerca de índices de capacidade para situações em que há apenas um limite de especificação. Neste trabalho, um índice para situações em que há apenas um limite de especificação é apresentado. Ele é invariante com respeito à fração não-conforme do processo e "calibrado" pelo índice Cpk,. São desenvolvidos também aspectos inferenciais, do ponto de vista bayesiano, para amostragem binomial.

Palavras-chave

Índices de capacidade, fração não-conforme, especificação unilateral, estatística bayesiana

Abstract

Process capability indices have become popular tools to describe how well a process can meet specified tolerances. However, little attention has been given to the study of these indices when the specified tolerances are one-sided. In this work we present an index for such situations. The proposed index is invariant with respect to process fraction non-conforming and it is "Cpk calibrated". Bayesian inference procedure under a binomial sampling is also developed and described for the proposed index.

Keywords

Process capability indices, Non-conforming fraction, One-sided specification limit, Bayesian analysis

References



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