Control charts with predetermined sampling intervals

Purpose - The purpose of this paper is to investigate a new sampling methodology previously proposed for systems with a known lifetime distribution: the Predetermined Sampling Intervals (PSI) method.Design methodology approach - The methodology is defined on basis of system hazard cumulative rate, a...

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Bibliographic Details
Published in:The International journal of quality & reliability management 2008-04, Vol.25 (4), p.423-435
Main Authors: Rodrigues Dias, J, Infante, Paulo
Format: Article
Language:English
Subjects:
Control charts
Expected values
Methods
Process controls
Quality control
Random variables
Sample size
Sampling methods
Sampling techniques
Studies
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Summary:Purpose - The purpose of this paper is to investigate a new sampling methodology previously proposed for systems with a known lifetime distribution: the Predetermined Sampling Intervals (PSI) method.Design methodology approach - The methodology is defined on basis of system hazard cumulative rate, and is compared with other approaches, particularly those whose parameters may change in real time, taking into account current sample information.Findings - For different lifetime distributions, the results obtained for adjusted average time to signal (AATS) using a control chart for the sample mean are presented and analysed. They demonstrate the high degree of statistical performance of this sampling procedure, particularly when used in systems with an increasing failure rate distribution.Practical implications - This PSI method is important from a quality and reliability management point of view.Originality value - This methodology involves a process by which sampling instants are obtained at the beginning of the process to be controlled. Also this new approach allows for statistical comparison with other sampling schemes, which is a novel feature.
ISSN:0265-671X
1758-6682
DOI:10.1108/02656710810865285