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題名:廣泛加權移動平均中位數與多變量管製圖之設計策略探討
作者:楊玲
作者(外文):Ling Yang
校院名稱:國立臺灣科技大學
系所名稱:工業管理系
指導教授:徐世輝
學位類別:博士
出版日期:2005
主題關鍵詞:管製圖指數加權移動平均廣泛加權移動平均平均連串長度中位數多變量工程製程管制品質成本control chartEWMAgenerally weighted moving averageaverage run lengthmedianmultivariateEPCquality cost
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有效率的品質管制可以增加生產力、降低成本,因此,很多研究人員致力於增強偵測製程偏移的管制能力。在製造業的許多應用上,因為修華特管製圖的繪製簡便、易於解釋而獲得廣泛應用,但因修華特管製圖在偵測小的製程偏移時顯得沒有效率,其他可選擇的管製圖,如累積和(CUSUM)管製圖與指數加權移動平均(EWMA)管製圖陸續被發展出來。Sheu與Lin 提出的廣泛加權移動平均(GWMA)管製圖,已證實在偵測製程平均數的小量偏移上,比修華特管製圖與EWMA管製圖更有效率。
在本論文中,我們提出GWMA中位數管製圖(GWMA- )之設計架構,以偵測製程中位數,我們利用電腦模擬來評估GWMA- 管製圖的平均連串長度,結果顯示GWMA- 管製圖在偵測製程中位數/平均數之微小偏移上,其偵測的效率比Castagliola所提出的EWMA- 管製圖好。接著我們提出多變量GWMA管製圖(Multivariate GWMA;MGWMA)之設計架構,以監測製程的平均數向量,同樣利用電腦模擬來評估管製圖的平均連串長度,結果顯示MGWMA管製圖在偵測製程平均數向量之微小偏移上,亦比Lowry等人所提出的多變量EWMA (MEWMA)管製圖更有效率。
另外,在生產管理上為了同時獲得消除可歸屬變異與共同變異的好處,研究有效率的整合工程製程管制(EPC)與統計製程管制(SPC)(簡稱EPC/SPC)的方法,已經逐步引起興趣,然而大部份皆只在單變量的情況,因此在本論文中,我們提出整合多變量工程製程管制與多變量統計製程管制(簡稱MEPC/MSPC)之管制架構,並應用Lorenzen-Vance的成本模式與Taguchi的品質成本函數以發展MEPC/MSPC 管製圖的經濟模型,在合理的情況下討論MEPC與MSPC的管制效率。並在MEPC/MSPC架構下,分別比較Hotelling多變量管製圖、MEWMA管製圖與MGWMA管製圖的偵測效率並討論相關的管制策略。無論以統計的觀點或以經濟的觀點,電腦模擬的結果皆顯示在偵測製程平均數向量的微小偏移上,結合MEPC與MGWMA管製圖的效率比MEPC/MEWMA管製圖及MEPC/Hotelling多變量管製圖的效率還要好。
Effective quality control can be instrumental in increasing productivity and reducing cost. Many researchers have focused on enhancing the ability of the control chart to detect process shifts. In many applications、in manufacturing industries、the Shewhart control charts are used for statistical process control because they are simple to plot and easy to interpret. However、the Shewhart control charts are relatively inefficient in detecting small process shifts. Alternative control charts、such as the CUSUM control chart and the EWMA control chart have been developed. The generally weighted moving average (GWMA) control chart proposed by Sheu and Lin has been shown to perform much better than both the Shewhart control chart and the EWMA control chart in monitoring small shifts of the process mean.
In this thesis、we propose the GWMA median control chart (GWMA- ) to monitor the process median. We use simulation to evaluate the ARL properties of the control chart. The simulation result reveals that the GWMA- control chart performs much better than the EWMA- control chart (proposed by Castagliola) in detecting small shifts of the process mean/median. We also propose a multivariate GWMA control chart (MGWMA) to monitor the process mean vector. Again、the simulation is used and the result also reveals that the MGWMA control chart performs much better than the MEWMA control chart (proposed by Lowry et al.) in detecting small shifts of the process mean vector.
For manufacturing processes、in order to obtain the advantages of eliminating both assignable causes and common causes、an effective method to integrate engineering process control (EPC) and statistical process control (SPC) is rousing escalated interests. However、most of the studies are restricted to univariate case. In this thesis、we propose a control scheme for integrating multivariate EPC and multivariate SPC (MEPC/MSPC). The Lorenzen-Vance total cost model and the Taguchi’s quality cost function are used to develop an economic model for MEPC/MSPC charts. We demonstrate the potential effectiveness of MEPC/MSPC in a reasonable and general situation. Under MEPC/MSPC scheme、some MSPC charts are compared and the control strategy is discussed. Whether from the statistical point of view or the economic point of view、the simulation result reveals that combining MEPC and the MGWMA control chart is more efficient than the MEPC/MEWMA control chart and the MEPC/Hotelling multivariate control chart in detecting small shifts of the mean vector.
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