An economically designed, integrated quality and maintenance model using an adaptive Shewhart chart

An economically designed, integrated quality and maintenance model using an adaptive Shewhart chart

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Article ID: iaor20103850
Volume: 94
Issue: 3
Start Page Number: 732
End Page Number: 741
Publication Date: Mar 2009
Journal: Reliability Engineering and System Safety
Authors: ,
Keywords: control charts, Shewhart chart
Abstract:

This paper proposes a model for the economic design of a variable-parameter (Vp) Shewhart control chart used to monitor the mean in a process, where, apart from quality shifts, failures may also occur. Quality shifts result in poorer quality outcome, higher operational cost and higher failure rate. Thus, removal of such quality shifts, besides improving the quality of the outcome and reducing the quality cost, is also a preventive maintenance (PM) action since it reduces the probability of a failure and improves the equipment reliability. The proposed model allows the determination of the scheme parameters that minimize the total expected quality and maintenance cost of the procedure. The monitoring mechanism of the process employs an adaptive Vp-Shewhart control chart. To evaluate the effectiveness of the proposed model, its optimal expected cost is compared against the optimum cost of a fixed-parameter (Fp) chart.

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