Determination of the optimal production run and the most profitable process mean for a production process

Abstract

This paper deals with the problem of joint determination of the optimal process mean and the production run for a process. It extends the Quality Selection problem to production systems in which the process mean (target) shifts to an outof-control state due to an assignable cause. The problem has been validated using various exan~ples. Moreover, results indicate that an inverse relationship exists for the length of production run and the difference expected profit between in-control state and out-of-control state.

Integrated model for determining the optimal initial settings of the process mean and the optimal production run assuming quadratic loss functions

“…Jeang and Yang (1992) and Makis (1995Makis ( , 1996 have extended the work of Drezner and Wesolowsky (1989) by addressing the problem of the economic selection of an initial setting and the tool replacement time by considering a non-symmetric quadratic loss function for the deviation from the target value. Chen and Chung (1996) considered the quality selection problem in which the process mean shifts to an out-of-control state due to the occurrence of an assignable 3284 M. A. Rahim and F. Tuffaha cause. It is assumed that the occurrence time of the assignable cause is exponentially distributed.…”

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Chen and Chung (1996) addressed the problem of the joint determination of the optimal process mean and production run for an industrial process. Their study considered a product with an upper and a lower specification limit.

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Um sistema para classificar e codificar os trabalhos que relacionam o controle da produção e o controle da qualidade

“…Três deles, Fine (1986), Hsu & Tapiero (1990) e Chen & Chung (1996), optam por maximizar os lucros. Fine (1986) confronta a teoria da otimização da proporção de defeituosos com a teoria do zero defeito.…”

“…Hsu & Tapiero (1990) encontram ótimos tempos de ciclo de produção e política de controle de qualidade (número e periodicidade da amostra, número de aceitação para a amostra). Já Chen & Chung (1996) encontram, além do ótimo tempo de ciclo, a ótima média de defeitos no processo. Outro artigo que não recorre à minimização dos custos é o trabalho de Del Castillo (1995), o qual não se preocupa em realizar modelagens de custo.…”

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