Productivity and Quality in Smart Manufacturing Systems

An economic production quantity model with random defective rate, rework process and backorders for a single stage production system

Biswajit Sarkar, Leopoldo Eduardo Cárdenas-Barrón, Mitali Sarkar, Moses Laksono Singgih


This paper revisits the economic production quantity (EPQ) model with rework process at a single-stage manufacturing system with planned backorders. It is well known that any imperfect production system of real life has random defective rates. In this direction, this paper extends an inventory model to allow random defective rates. Basically, three different inventory models are developed for three different distribution density functions such as uniform, triangular, and beta. The analytical derivation provides closed-form solution for each inventory model. We have made comparison tables of optimal results among the distribution functions. Some numerical examples and sensitivity analysis are given to illustrate the inventory models.

Keyword: EPQ Imperfect production system, Defective products, Rework, Planned backorders


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