Optimising Shewhart charts in parallel production lines
by Ronald D. Fricker, Jr.
International Journal of Quality Engineering and Technology (IJQET), Vol. 1, No. 2, 2009

Abstract: I describe a methodology for optimising n Shewhart x-charts operating on parallel production lines in a factory. The goal is to maximise the factory-wide probability of detecting an out-of-control condition subject to a constraint on the expected number of false signals. I use non-linear programming to appropriately set the x-charts' control limits incorporating information about the probability of each production line going out-of-control. Using this approach, factories can set their quality control systems to optimally detect out-of-control conditions. Given some distributional assumptions, I also present a one-dimensional optimisation methodology that allows for the efficient optimisation of very large factories.

Online publication date: Thu, 21-Jan-2010

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