An analysis of Taguchi's on-line quality monitoring procedure for variables based on the results of a sequence of inspections

Pesquisa Operacional

Linda Lee Ho²  Roberto Quinino¹ 

[1] ,Universidade de São Paulo Departamento de Engenharia de Produção - Escola Politecnica

关键词: on-line process control;    quality control by variables;    Markov chain;    warning limit;    sequence of inspections;   

DOI  :  10.1590/S0101-74382012005000006

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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