Impact of the Variable Sampling Intervals Scheme on the CQC Chart

Abstract:

The Cumulative Quantity Control (CQC) chart which is based on monitoring the cumulative quantity of product manufactured has been shown to be useful for monitoring high yield processes. However, this chart is not so sensitive to small process changes and the inspection cost could be high if the inspection is frequent. In this paper, a variable sampling interval procedure of the CQC chart is developed and studied. We compare the performance of the variable sampling interval CQC chart in terms of its average time to signal with the traditional CQC chart and prove that this new chart performs better than the traditional CQC chart. The use of variable sampling interval scheme could further enhance the efficiency of traditional CQC chart.

• Periodical: Applied Mechanics and Materials (Volume 456)
• Pages: 627-630
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.456.627
• Online since: October 2013
• Authors: Ying Zhang*, Xiao Juan Wang
• Keywords: Average Time to Signal, CQC Chart, Variable Sampling Intervals

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