A Synthetic Control Chart for Monitoring Process Variability

作者：Rajmanya S V; Ghute V B^*

来源：Quality and Reliability Engineering International, 2014, 30(8): 1301-1309.

DOI：10.1002/qre.1551

• Control chart
• Process variability
• Average run length
• Conforming run length

The control chart based on Downton's estimator (D chart) has recently been introduced in the literature for monitoring the process variability. The D chart is found to be equally efficient to the S chart in terms of detecting shifts in process variability. In this paper, salient features of D chart and the conforming run length chart are combined to produce synthetic D chart. The average run length performance of the synthetic D chart is investigated using simulation study and is compared with the originally proposed D chart and some other procedures proposed in the literature. It is found that it has an improved performance in comparison with the traditional control charts for process variability.

• 出版日期2014-12