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- Title
Enhancing the performance of the EWMA control chart for monitoring the process mean using auxiliary information.
- Authors
Adegoke, Nurudeen A.; Abbasi, Saddam Akber; Dawod, Abdaljbbar B.A.; Pawley, Matthew D.M.
- Abstract
When using control charts to monitor manufacturing processes, the exponentially weighted moving average (EWMA) control chart is useful for detecting persistent shifts in the process parameter. This paper proposes enhancements to the applications of the EWMA control chart for those scenarios where the exact measurement of process units is difficult and expensive, but the visual ordering of the units can be done easily. The proposed charts use an auxiliary variable that is correlated with the process variable to provide efficient monitoring of shifts in the process mean and are formulated based on ranked set sampling (RSS) and median RSS schemes (MRSS). Simulation results showed that the proposed charting schemes are more efficient in detecting a shift in the process mean than the classical EWMA control chart and its modification. An example is provided to show the application of the proposed charts using a simulated benchmark process: the continuous stirred tank reactor (CSTR).
- Subjects
STATISTICAL process control; CUSUM technique; ELECTRIC conduits; QUALITY control charts; MOVING average process
- Publication
Quality & Reliability Engineering International, 2019, Vol 35, Issue 4, p920
- ISSN
0748-8017
- Publication type
Article
- DOI
10.1002/qre.2436