Optimum Production Run Length and Process Mean Setting

In this paper, the author presented a modified Chen and Chung's model considering that the process mean may not be equal to the target value when the process is in the in-control state. Taguchi's asymmetric quadratic quality loss function will be applied in evaluating the product quality. Subsequently, the modified economic manufacturing quantity (EMQ) model based on modified the Chen and Chung's model is formulated for obtaining the expected total cost per year. The numerical result shows that for an in-control process, the modified EMQ model when the process mean is not equal to the target value has smaller expected total cost per year than that of the modified EMQ model when the process mean is equal to the target value.