A Study on the Production Planning for the Products with Restrincted Demand Periods

Abstract

This Paper deals with problem of determine in the number of set-ups, production lot size, production priority and production starting time under a single stage lot production system. The product items produced in the system have different demand periods and starting time for demand. The production planning aims to determine the number of set-ups for load ratio, set up time ratio and maintain each demand point for item. As a result of analysis, a structural formulation of product inventory is revealed. It can clarify the relation among the number of set-ups each product, production lot size 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. 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.