This paper considers a procedure for the economic design of a cumulative score(CUSCORE) control chart which is more robust than the conventional CUSUM control chart and more sensitive than ??-type control chart for small shift to control the mean of a...
This paper considers a procedure for the economic design of a cumulative score(CUSCORE) control chart which is more robust than the conventional CUSUM control chart and more sensitive than ??-type control chart for small shift to control the mean of a process with a exponentially distributed quality characteristic.
An expected loss - cost mode as a function of design variables (sample size, sampling interval, scoring limit and decision limit) is derived. Direct search techniques are used to optimize the model subject to ARL in control.
Numerical examples and sensitivity a comparision study with CUSUM charts is given.
CUSCORE control charts compare favourably with CUSUM charts in cost for speedy production process.
The proposed control chart can be directly applied for controlling the lifetime characteristics.