T 2 charts are used to monitor a process when more than one quality variable associated with process is being observed. Recent studies have shown that the T 2 chart with variable sampling size and sampling interval (VSSI) detects a small shift in the process mean vector faster than the traditional T 2 chart. The paper considers an economic design of the VSSI T 2 chart, in which the expected hourly loss is constructed and regarded as an objective function for optimally determining the design parameters (i.e. the maximum/minimum sample size, the longest/shortest sampling interval, and the warning/action limits) in sampling-and-charting. Furthermore, the effects of process parameters and cost parameters upon the expected hourly loss and design parameters are examined.
Quality & Quantity – Springer Journals
Published: Mar 20, 2007
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