Performance of cumulative count of conforming chart with variable sampling intervals in the presence of inspection errors

In high quality industrial processes, the control chart is design based on cumulative count of conforming (CCC) items is very useful. In this paper, the performance of CCC-r chart with variable sampling intervals (CCC-rVSI chart) in the presence of inspection errors is investigated. The efficiency of CCC-rVSI chart is compared with CCC-r chart with fixed sampling interval (CCC-rFSI chart). The comparison results show thatthe VSI scheme can performs better than the FSI scheme. In addition, analysis and discussion of the results are presented to illustrate the effect of input parameters on the performance of CCC-rVSI chart.