Uma ánalise do procedimento de controle on-line de qualidade de Taguchi baseado nos resultados de uma sequência de inspeções

• Ano de defesa: 2012
• Autor(a) principal: Luciana Marcelino de Oliveira
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Intervalo de amostragem variável; inspeções; Cadeia de Markov; Seqüência de; Controle on-line de processos; Estatistica
• Link de acesso: http://hdl.handle.net/1843/ICED-8THHJ3

In this paper, a procedure for the on-line process control of variables is proposed. This procedure consists of inspecting the m-th item from every m produced items and deciding, at each inspection, whether the process is out-of-control. Two sets of limits, warning ( bW 0 Ý ) and control ( bC 0 Ý ), are used. If the value of the monitored statistic falls beyond the control limits or if a sequence of h observations falls between the warning limits and the control limits, the production is stopped for adjustment; otherwise, production goes on. The properties of an ergodic Markov chain are used to obtain an expression for the average cost per item. The parameters (the sampling interval m, the widths of the warning W, the control limits C (W T C), and the sequence length (h) are optimized by minimizing the cost function. A numerical example illustrates the proposed procedure.