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Optimal np Control Charts with Variable Sample Sizes or Variable Sampling Intervals
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Hua Luo
Published/Copyright:
March 11, 2010
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.
Key Words:: Adaptive control chart; Average time to signal; Inspection rate; Sample size; Sampling interval
Published Online: 2010-03-11
Published in Print: 2002-April
© Heldermann Verlag
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Keywords for this article
Adaptive control chart;
Average time to signal;
Inspection rate;
Sample size;
Sampling interval
Articles in the same Issue
- Optimal Minimal Maintenance of Multistage Degraded System with Repairs
- Performability of Two Modules in Series
- Process Targeting for Optimal Capability when the Product is Subject to Degradation
- Optimal np Control Charts with Variable Sample Sizes or Variable Sampling Intervals
- A Process Control Plan with Two-Phase Inspection
- A Note on Selecting Target and Process Capability Index Based on Fuzzy Optimization
- Prediction Intervals, Tolerance Intervals and Standards in Quality Control - Part 1
- Comparison of Semi-Economic and -R Control Charts for Non-Ageing and Ageing Process
- Modelling of Explosives Sensitivity Part 1: The Bruceton Method
