Made available in DSpace on 2014-12-17T14:53:03Z (GMT). No. of bitstreams: 1
AndreLSR_DISSERT.pdf: 1376512 bytes, checksum: 77587a4d46a8d965b17b7df02200c5a6 (MD5)
Previous issue date: 2010-12-29 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / This paper proposes a procedure to control on-line processes for attributes, using an Shewhart
control chart with two control limits (warning limit and control limit) and will be based on a
sequence of inspection (h). The inspection procedure is based on Taguchi et al. (1989), in
which to inspect the item, if the number of non-conformities is higher than an upper control
limit, the process needs to be stopped and some adjustment is required; and, if the last
inspection h, from all items inspected present a number of non-conformities between the
control limit and warning limit. The items inspected will suffer destructive inspection, being
discarded after inspection. Properties of an ergodic Markov chain are used to get the
expression of average cost per item and the aim was the determination of four optimized
parameters: the sampling interval of the inspections (m); the constant W to draw the warning
limit (W); the constant C to draw the control limit (C), where W ? C, and the length of
sequence of inspections (h). Numerical examples illustrate the proposed procedure / Este trabalho prop?e um procedimento de controle on-line de processos por atributos,
utilizando um gr?fico de Shewhart com dois Limites de Controle (Limite de Advert?ncia e
Limite de Controle) e ser? baseado numa sequ?ncia de inspe??o (h). O procedimento de
inspe??o ? baseado em Taguchi et al. (1989). Assim, ao inspecionar o item, o processo ?
parado para ajuste se o n?mero de n?o conformidades for superior ao Limite de Controle;
como tamb?m se nas ?ltimas h inspe??es, todos os h itens inspecionados apresentarem um
n?mero de n?o-conformidades entre os Limites de Advert?ncia e de Controle. Utilizando-se
de propriedades de uma Cadeia de Markov Erg?dica, foi obtida uma express?o do custo
m?dio do sistema de controle, que pode ser minimizada por quatro par?metros: Intervalo entre
inspe??es (m), Limite de Advert?ncia (W), Limite de controle (C, em que W ≤ C) e o tamanho
da sequ?ncia de inspe??o (h). Um exemplo num?rico ilustra o procedimento proposto
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15019 |
| Date | 29 December 2010 |
| Creators | Rocha, Andre Luiz Sena da |
| Contributors | CPF:67159370449, http://lattes.cnpq.br/5283839079235343, Ho, Linda Lee, CPF:87304341815, http://lattes.cnpq.br/8761079318223326, Costa, Antonio Fernando Branco, CPF:01955480869, http://lattes.cnpq.br/6100382011052492, Quinino, Roberto da Costa, CPF:80871291720, http://lattes.cnpq.br/4614108535307047, Ferreira, Debora Borges, CPF:71101497149, http://lattes.cnpq.br/8894486682278789, Medeiros, Pledson Guedes de |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Engenharia de Produ??o, UFRN, BR, Estrat?gia; Qualidade; Gest?o Ambiental; Gest?o da Produ??o e Opera??es |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
Page generated in 0.0025 seconds