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https://ah.lib.nccu.edu.tw/handle/140.119/46079
題名: | Using VSI EWMA charts to monitor dependent process steps with incorrect adjustment | 作者: | 楊素芬 Yang,Su-Fen;Yu,Yi-Ning |
關鍵詞: | Control charts; Dependent process steps; Incorrect adjustment; Markov chain | 日期: | 2009 | 上傳時間: | 6-十月-2010 | 摘要: | The article considers the variable process control scheme for two dependent process steps with incorrect adjustment. Incorrect adjustment\r\nof a process may result in shifts in process mean, ultimately affecting the quality of products. We construct variable sampling interval\r\n(VSI) EWMAZX and EWMAZe control charts to effectively monitor the quality variable produced by the first process step with\r\nincorrect adjustment and the quality variable produced by the second process step with incorrect adjustment. The performance of the\r\nproposed VSI control charts is measured by the adjusted average time to signal (AATS) derived using a Markov chain approach. An\r\nexample of the automobile braking system with incorrect adjustment shows the application and performance of the proposed VSI\r\nEWMAZX and EWMAZe control charts in detecting shifts in process mean. Furthermore, the performance of the proposed VSI\r\nEWMAZX and EWMAZe control charts and the fixed sampling interval (FSI) EWMAZX and EWMAZe control charts are compared\r\nby numerical analysis results. These demonstrate that the former is much faster in detecting small and median shifts in mean. The optimum\r\nVSI EWMAZX and EWMAZe control charts are also proposed using optimization technique to minimize AATS when quality engineers\r\ncannot specify the values of variable sampling intervals. It has been found that the optimum VSI EWMAZX and EWMAZe control\r\ncharts always work better than the VSI EWMAZX and EWMAZe control charts. | 關聯: | Expert System and Application,36(1),442-454 | 資料類型: | article | DOI: | http://dx.doi.org/10.1016/j.eswa.2007.09.036 |
Appears in Collections: | 期刊論文 |
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