FUZZY CONTROL CHARTS FOR VARIABLE AND ATTRIBUTE QUALITY CHARACTERISTICS

Document Type: Research Paper

Authors

1 DEPARTMENT OF INDUSTRIAL ENGINEERING, AMIRKABIR UNIVERSITY OF TECHNOLOGY, TEHRAN, IRAN

2 DEPARTMENT OF MECHANICAL AND INDUSTRIAL ENGINEERING, UNIVERSITY OF TORONTO, TORONTO, ON, CANADA, M5S2H8

3 DEPARTMENT OF INDUSTRIAL ENGINEERING, AMIRKABIR UNIVERSITY OF TECHNOLOGY, P. O. BOX: 15875-4413, TEHRAN, IRAN

Abstract

This paper addresses the design of control charts for both variable ( x chart) and
attribute (u and c charts) quality characteristics, when there is uncertainty about the process
parameters or sample data. Derived control charts are more flexible than the strict crisp case, due
to the ability of encompassing the effects of vagueness in form of the degree of expert’s
presumption. We extend the use of proposed fuzzy control charts in case of linguistic data using a
developed defuzzifier index, which is based on the metric distance between fuzzy sets.

Keywords


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