Optimal np Control Charts with Variable Sample Sizes or Variable Sampling Intervals

Luo Hua and Wu Zhang
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Luo Hua: School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798
Wu Zhang: School of Mechanical and Production Engineering, Nanyang Technological University, Singapore 639798

Stochastics and Quality Control, 2002, vol. 17, issue 1, 39-61

Abstract: Many researches have shown that the adaptive control charts are more effective than the traditional static ones in detecting process shifts. This paper develops an algorithm for the optimization designs of the Variable Sample Size (VSS) np chart and the Variable Sampling Intervals (VSI) np chart for monitoring process fraction nonconforming p. The properties of the VSI and VSS np charts are measured by the steady-state Average Time to Signal (ATS). The performance of these adaptive np charts are studied and compared with the static np charts. It is found that the adaptive np charts do improve the effectiveness significantly, especially for detecting small or moderate process shifts.

Keywords: Adaptive control chart; Average time to signal; Inspection rate; Sample size; Sampling interval (search for similar items in EconPapers)
Date: 2002
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DOI: 10.1515/EQC.2002.39

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