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IJE TRANSACTIONS B: Applications Vol. 31, No. 5 (May 2018) 636-645    Article in Press

PDF URL: http://www.ije.ir/Vol31/No5/B/15.pdf  
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  THE CCC-R CHART WITH THE VARIABLE SAMPLING INTERVALS UNDER GROUP INSPECTION IN THE PRESENCE OF INSPECTION ERRORS
 
M. S. Fallah Nezhad and Y. Shamstabar
 
( Received: February 27, 2017 – Accepted: February 08, 2018 )
 
 

Abstract    The cumulative count of conforming (CCC-r) control chart considers the number of units that must be inspected to observe the rth non-conforming one. These charts are designed based on the negative binomial distributions, and they are powerful charting technique used to monitoring very high quality processes. This paper investigated the performance of using variable sampling scheme (VSI) for CCC-r control chart under group inspection (CCCG-rVSI chart) in the presence of inspection errors. It is shown that the CCCG-rVSI chart performs better than CCCG-r chart with fix sampling interval (CCCG-rFSI) chart. Furthermore, Numerical analysis is presented to demonstrate the efficiency of VSI scheme for the proposed control chart.

 

Keywords    CCC-r control chart; group inspection; inspection errors; variable sampling interval; average time to signal

 

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