Comparison Analysis of Due Date Assignment Methods Using Scheduling Rules in a Job Shop Production System

This paper presents a simulation and comparison analysis conducted to investigate the due-date assignment methods through various scheduling rules. The due date assignment methods investigated are flow time due date (FTDD) and total work content (TWK) method. Three scheduling rules are integrated in the simulation for scheduling of jobs on machines. The performance of the study is evaluated based on the configuration system of Hibret manufacturing and machine building Industry, subsidiary company of Metals and Engineering Corporation were thoroughly considered. The performance of the system is evaluated based on maximum tardiness, number of tardy jobs and total weighted tardiness. Simulation experiments are carried in different scenarios through combining due-date assignment methods and scheduling rules. A two factor Analysis of variance of the experiment result is performed to identify the effect of due-date assignment methods and scheduling rules on the performance of the job shop system. The least significant difference (LSD) method was used for performing comparisons in order to determine which means differ from the other. The finding of the study reveals that FTDD methods gives less mean value compared to TWK when evaluated by the three scheduling rules.