Fuzzy exponentially weighted moving average control chart for univariate data with a real case application


ŞENTÜRK S., ERGİNEL N., KAYA İ., Kahraman C.

APPLIED SOFT COMPUTING, vol.22, pp.1-10, 2014 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 22
  • Publication Date: 2014
  • Doi Number: 10.1016/j.asoc.2014.04.022
  • Journal Name: APPLIED SOFT COMPUTING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.1-10
  • Keywords: Statistical process control, EWMA, Fuzzy control charts, Fuzzy EWMA, LINGUISTIC DATA, ALPHA-CUTS, CONSTRUCTION
  • Anadolu University Affiliated: Yes

Abstract

Statistical process control (SPC) is an approach to evaluate processes whether they are in statistical control or not. For this aim, control charts are generally used. Since sample data may include uncertainties coming from measurement systems and environmental conditions, fuzzy numbers and/or linguistic variables can be used to capture these uncertainties. In this paper, one of the most popular control charts, exponentially weighted moving average control chart (EWMA) for univariate data are developed under fuzzy environment. The fuzzy EWMA control charts (FEWMA) can be used for detecting small shifts in the data represented by fuzzy numbers. FEWMA decreases number of false decisions by providing flexibility on the control limits. The production process of plastic buttons is monitored with FEWMA in Turkey as a real application. (C) 2014 Elsevier B.V. All rights reserved.