Joint determination of rotation cycle time and number of shipments for a multi-item EPQ model with random defective rate

Yuan-Shyi Peter Chiu, Chao-Chih Huang, Mei-Fang Wu and Huei-Hsin Chang

Economic Modelling, 2013, vol. 35, issue C, 112-117

Abstract: This paper addresses the joint determination of a rotation cycle time and number of shipments for a multi-item economic production quantity (EPQ) model with random defective rate. The classic EPQ model considers production planning for a single product with a perfect production process and continuous inventory issuing policy for its finished goods. However, in real vendor–buyer integrated systems, the multi-delivery policy is often used in lieu of the continuous issuing policy, and due to various uncontrollable factors, the generation of defective items is inevitable. Furthermore, in order to maximize machine utilization, management often plans the production of m products in turn on a single machine, rather than a single product on one machine, as assumed by the EPQ model. Therefore, by assuming that all defective items produced are scrap, this study aims to jointly determine the optimal rotation cycle time and number of shipments that minimize the long-run average cost for such an imperfect quality multi-item EPQ model. We employ mathematical modeling with the renewal reward theorem and obtain closed-form optimal operating policies for the proposed model. Further, we demonstrate the practical use of the results by using a numerical example and sensitivity analysis.

Keywords: Multi-item production system; Rotation cycle time; Multi-delivery; Economic production quantity model; Scrap; Vendor–buyer integrated system (search for similar items in EconPapers)
JEL-codes: C02 C44 C61 M11 (search for similar items in EconPapers)
Date: 2013
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Persistent link: https://EconPapers.repec.org/RePEc:eee:ecmode:v:35:y:2013:i:c:p:112-117

DOI: 10.1016/j.econmod.2013.06.024

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