Using the fuzzy method to evaluate manufacturing productivity

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Conference Proceeding
ASME International Mechanical Engineering Congress and Exposition, Proceedings, 2009, pp. 115 - 121
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This paper introduces a useful method for improvement of the time forecasting of production lines operating at full speed production time (FSPT) and dealing with uncertain time losses. The full speed production time is a major index of the production lineâs performance because it enables direct evaluation of production line output. This measure is called as overall equipment effectiveness (OEE). The fixed theoretically available hours minus time losses such as holidays, broken equipment and raw materials or labor shortages give us the production linesâ full speed production time. The waterfall chart model (WCM) improves the measurement of FSPT and can thereby help decision-makers to evaluate OEE. Unfortunately, there are many uncertain and imprecise factors operating. The fuzzy method can be used to reduce the degree and effect of uncertainty and imprecision [1]. We therefore introduce fuzzy theory into our WCM chart. This will assist decision makers in evaluating uncertainty and imprecision and obtain improved OEE measurements as well as producing better production plans and master production schedules [2].
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