An Economic Design of Combined Double Sampling and Variable Sample Size X ̅ Control Chart

Journal of System Management

مقاله 1، دوره 3، شماره 1 - شماره پیاپی 9، فروردین 2017، صفحه 1-15

نوع مقاله: Research Paper

نویسندگان

Saeed Khaki^* ؛ Niloufar Ghanbari؛ Mir Mahdi Seyed Esfehani

Department of Industrial Engineering and Management Systems, Amirkabir University of Technogy, Tehran, Iran

چکیده

In recent years several studies have shown that  control charts with adaptive schemes or double sampling plans detect both small and moderate shifts in the process mean more quickly than the traditional Shewhart  chart. In the classical double sampling  chart, the difference between two points were placed in the central region of first stage was not considered. In this study, a new control chart is proposed by combination of double sampling  chart and variable sample size  chart (called DSVSS chart), that can successfully reduce the detection time of small mean shift. Before a DSVSS  chart is used, its design parameters should be determined, hence economic design model of DSVSS  chart is constructed. Markov chain approach is used to compute the statistical properties of the chart that are essential to our cost function. Then, the Genetic Algorithms (GA) are used to solve the optimal designs of DSVSS  chart. Finally, a numerical example is provided to illustrate the use of this model.

کلیدواژه‌ها

Keywords؛ Quality Control, Double Sampling Chart, Variable Sample Size Chart, Markov Chain, Genetic Algorithms

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