Multi Order Production Planning for Parallel Working Machine by Maximizing Makespan

This work developed the method used to plan the production for the identical machines which work parallel. The objective is to achieve the maximum working efficiency condition. There are two types of machines including regular and special ones. The same type of machine might work independently and/or dependently depending on the processes required but for the different type, machine will work dependently. The model based on the determination of machine makespan was applied in order to assign the works providing the maximum daily working time or the minimum idle time of each machine. First, the method used to plan the production system of interest was developed from the basic definition of working efficiency. Then the planning method for multi order production was written. The constrained conditions were determined based on the nature of the production of interest. The results of plan were validated by comparing them to former work and the real condition. It was found that the developed method provided the plan possibly achieving 100% of machine working efficiency. The developed plans established the average machine efficiency being higher than 90%, comparing to original planning method having efficiency only 60-70%.