Abstract
This paper deals with the problem of determine in the number of set-ups for load ratio and set up time ratio, production lot size, production priority and production starting time under a single stage lot production system, multi-production planning period, cyclic schedule for items with a succession of different demand periods. The product items produced in the system have different demand periods and starting times for demand. The production planning aims to determine the number of set-ups for load ratio, set up a time ratio and maintain each demand point for item. As a result of analysis, a structural formulation of product inventory is revealed, as well as the occurrence of interference situations in each production planning. It can clarify the relation among the number of set-ups for each product, production lot size for each product, required quantity of each product, starting time for demand of each product, processing time and set up time of each product, each demand period, product inventory, and two dissolve methods. Based on the formulation, an algorithm is proposed to determine the number of set-ups for load ratio and set up time ratio, production lot sizes, production priority and production starting times. A numerical example shows the usefulness of the procedure proposed.
