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phase-i monitoring of standard deviations in multistage linear profiles
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نویسنده
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kalaei mahdiyeh ,soleimani paria ,akhavan niaki taghi ,atashgar karim
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منبع
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journal of industrial engineering international - 2018 - دوره : 14 - شماره : 1 - صفحه:133 -142
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چکیده
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In most modern manufacturing systems, products are often the output of some multistage processes. in these processes, the stages are dependent on each other, where the output quality of each stage depends also on the output quality of the previous stages. this property is called the cascade property. although there are many studies in multistage process monitoring, there are fewer works on profile monitoring in multistage processes, especially on the variability monitoring of a multistage profile in phase-i for which no research is found in the literature. in this paper, a new methodology is proposed to monitor the standard deviation involved in a simple linear profile designed in phase i to monitor multistage processes with the cascade property. to this aim, an autoregressive correlation model between the stages is considered first. then, the effect of the cascade property on the performances of three types of t 2 control charts in phase i with shifts in standard deviation is investigated. as we show that this effect is significant, a u statistic is next used to remove the cascade effect, based on which the investigated control charts are modified. simulation studies reveal good performances of the modified control charts.
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کلیدواژه
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multistage processes ,cascade property ,profile monitoring ,phase i
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آدرس
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malek ashtar university of technology, industrial engineering department, ایران, islamic azad university, south tehran branch, industrial engineering department, ایران, sharif university of technology, industrial engineering department, ایران, malek ashtar university of technology, industrial engineering department, ایران
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پست الکترونیکی
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atashgar@iust.ac.ir
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Authors
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