Keywords :
Coefficient of variation; CUSUM control charts; Markov chain; Measurement error; SPC; Flowcharting; Graphic methods; Markov processes; Measurement errors; Process control; Sintering; Accuracy errors; Cumulative sum control charts; Cusum control chart; Precision errors; Process shifts; Sintering process; Specific values; Control charts
Abstract :
[en] In this paper, we investigate the effect of the measurement error on the performance of the cumulative sum (CUSUM) control charts monitoring the coefficient of variation. The measurement errors are supposed to follow a linear covariate error model. The obtained results show that the precision error ratio and the accuracy error have negative impact on the chart performance. Moreover, in order to overcome the difficulty in predetermining a specific value for the process shift size, we suggest to optimize the parameters of the charts according to the random shift size in a given interval. The robustness of the proposed method is studied. An example is given to illustrate the use of the CUSUM charts on a real quality control problem from sintering process. © 2019, Springer-Verlag London Ltd., part of Springer Nature.
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