Economic design of an chart for short-run production |
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Authors: | Linda Lee Ho Anderson Lacio Galindo Trindade |
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Institution: | aDepartamento de Engenharia de Produção, Universidade de São Paulo, Av. Prof. Almeida Prado, Trav. 2, No 128, 05508-900 São Paulo, Brazil;bDepartamento de Engenharia de Produção, Universidade de São Paulo, São Paulo, Brazil |
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Abstract: | The aim of this paper is to present an economical design of an X chart for a short-run production. The process mean starts equal to μ0 (in-control, State I) and in a random time it shifts to μ1>μ0 (out-of-control, State II). The monitoring procedure consists of inspecting a single item at every m produced ones. If the measurement of the quality characteristic does not meet the control limits, the process is stopped, adjusted, and additional (r-1) items are inspected retrospectively. The probabilistic model was developed considering only shifts in the process mean. A direct search technique is applied to find the optimum parameters which minimizes the expected cost function. Numerical examples illustrate the proposed procedure. |
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Keywords: | Short-run production On-line process control Process control for variables Markov chain |
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