We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Efficient homogeneously weighted dispersion control charts with an application to distillation process.
- Authors
Abbasi, Saddam Akber; Nassar, Sara Hussam; Aldosari, Mashael Mohammed; Adeoti, Olatunde A.
- Abstract
Monitoring disturbances in process dispersion using control chart is mostly based on the assumption that the quality characteristic follows normal distribution, which is not the case in many real-life situations. This paper proposes a set of new dispersion charts based on the homogeneously weighted moving average (HWMA) scheme, for efficient detection of shifts in process standard deviation (σ). These charts are based on a variety of σ estimators and are investigated for normal as well as heavy tailed symmetric and skewed distributions. The shift detection ability of the charts is evaluated using different run length characteristics, such as average run length (ARL), extra quadratic loss (EQL), and relative ARL measures. The performance of the proposed HWMA control charts is also compared with the existing EWMA dispersion charts, using different design parameters. Furthermore, an illustrative example is presented to monitor the vapor pressure in a distillation process.
- Subjects
ASSOCIATION of Research Libraries; QUALITY control charts; DISTRIBUTION (Probability theory); SKEWNESS (Probability theory); DISTILLATION; DISPERSION (Chemistry); VAPOR pressure
- Publication
Quality & Reliability Engineering International, 2021, Vol 37, Issue 8, p3221
- ISSN
0748-8017
- Publication type
Article
- DOI
10.1002/qre.2904