ECONOMIC DESIGN OF DOUBLE SAMPLING pm C CONTROL CHART FOR MONITORING PROCESS CAPABILITY INDEX
Abstract
The process capability index m p C is known as one of useful quality measures of process. Then, the m p C control chart has been proposed for monitoring the process condition, and the economical operation of the m p C control chart has been investigated. On the other hand, in sampling inspection, it is well known that double sampling plan can reduce average sampling number in comparison with single sampling plan. In this study, for the purpose of reducing the expected operating cost in the m p C control chart, we address the double sampling m p C control chart incorporating the feature that the judgment rule of the 2nd sampling stage is independent of the data record of the 1st sampling stage. The design algorithm for the addressed double sampling m p C control chart is constructed. Through numerical comparison, it is verified that the proposed double sampling m p C control chart has advantage in the expected operating cost against the existing single sampling m p C control chart.
Keywords
control chart, double sampling, economical operation, process capacity index, quality loss
DOI
10.12783/dtetr/icpr2017/17627
10.12783/dtetr/icpr2017/17627
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