Monitoring the coefficient of variation (CV) allows process monitoring to be performed when both theprocess mean and the standard-deviation are not constant but, nevertheless, proportional. Until now,few research papers have investigated the monitoring of the CV in a short production run context. This paper investigates the design and implementation of a Variable Sampling Interval (VSI) Shewhart control chart to monitor the coefficient of variation in a short production run context. Formulas for the truncated average time to signal are derived and a performance comparison is carried out with a Fixed Sampling Rate Shewhart chart monitoring the CV. An example illustrates the use of this chart on real industrial data.
|Titolo:||A Variable Sampling Interval Shewhart Control Chart for Monitoring the Coefficient of Variation in Short Production Runs|
|Data di pubblicazione:||2017|
|Appare nelle tipologie:||1.1 Articolo in rivista|