EXPLORATION OF A MULTI-PRODUCT EPQ-BASED SYSTEM WITH OVERTIME AND QUALITY REASSURANCE

In contemporary global marketplaces, buyers demand has to be satisfied with the timely provision of multiple products. Further; in real manufacturing settings, fabrication of imperfect items is inevitable owing to unanticipated issues; these items must be identified, separated, reworked or scrapped to keep product quality at the desired level. To cope with all these issues, producers must be able to make a flexible manufacturing plan that not only meets buyers' multi product needs on time with perfect quality goods, but also has smooth fabrication schedules. Overtime is an effective alternative for increasing output rate and reducing completion time in batch production. Seeking to assist in production planning, this study explores a multi product economic production quantity-based system with overtime and product quality reassurance, with the objective of finding the optimal stock refilling policy that minimizes total system cost. Mathematical techniques are employed to develop a precise model to represent the problem, find the total system cost, and determine a closed-form optimal common cycle length. A numerical illustration is provided to demonstrate that our model can reveal: (i) the influence of the variation in overtime-related factors on the system's variable cost, utilization, and total cost; (ii) the impact of difference in factors related to product quality on total system cost; and (iii) the combined impacts of changes in overtime and quality-related factors on various system parameters. Our investigation provides insights on system-related information that supports the planning and controlling functions of a realistic system.