On designing a new Tukey-EWMA control chart for process monitoring

Exponentially weighted moving average (EWMA) and cumulative sum (CUSUM) charts are used to detect smaller shifts in process parameters. The usual EWMA and CUSUM charts depend on the normality assumption for a better detection ability. This study proposes an efficient EWMA control chart based on the...

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Bibliographic Details
Published in:International journal of advanced manufacturing technology 2016-01, Vol.82 (1-4), p.1-23
Main Authors: Khaliq, Qurat-Ul-Ain, Riaz, Muhammad, Ahmad, Shabbir
Format: Article
Language:English
Subjects:
Aerospace industry
CAE) and Design
Computer-Aided Engineering (CAD
Control charts
CUSUM charts
Engineering
Industrial and Production Engineering
Mechanical Engineering
Media Management
Normality
Original Article
Process parameters
Process planning
Skewed distributions
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Summary:Exponentially weighted moving average (EWMA) and cumulative sum (CUSUM) charts are used to detect smaller shifts in process parameters. The usual EWMA and CUSUM charts depend on the normality assumption for a better detection ability. This study proposes an efficient EWMA control chart based on the spirit of Tukey control chart, especially designed for skewed distributions. The performance of the proposed and the competing charts is measured using different length properties such as average run length (ARL), standard deviation of run length (SDRL), and median run length (MDRL). We have observed that the proposed chart is quite efficient at detecting process shifts of smaller magnitude, especially for skewed distributions. For practical considerations, the proposed chart is implemented at aerospace manufacturing data on industrial production index.
ISSN:0268-3768
1433-3015
DOI:10.1007/s00170-015-7289-6