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Pesquisa Operacional

versão impressa ISSN 0101-7438


HO, Linda Lee  e  QUININO, Roberto. An analysis of Taguchi's on-line quality monitoring procedure for variables based on the results of a sequence of inspections. Pesqui. Oper. [online]. 2012, vol.32, n.1, pp.197-212.  Epub 03-Abr-2012. ISSN 0101-7438.

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 (µ0 ± W) and control (µ0 ± C), 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, the control limits W and C(W < C), and the sequence length (h) are optimized by minimizing the cost function. A numerical example illustrates the proposed procedure.

Palavras-chave : on-line process control; quality control by variables; Markov chain; warning limit; sequence of inspections.

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