Abstarct
This study presents an approach to solve the Scheduling Problems in dynamic manufacturing systems which represented by the occurrence of different changes and disruptions such as new rush jobs, and machines breakdown which affected the execution of the current schedule and may need to repair the initial schedule and change the sequence of job orders to handle the disruption and minimize makespan, flow times, and tardiness as could as possible. This study was applied at the Heat Exchange Factory Heavy Engineering Equipment State Company. The Right Shift Rescheduling Technique (RSRT) and the Due Dates Modification Rescheduling Technique (DDMRT) were applied in this study. The results were compared by developing schedule efficiency measure beside the traditional ones such as makespan, flow time, total accumulative tardiness, and number of tardy jobs. The application of rescheduling techniques showed that the RSRT is appropriate to machine breakdown in case of developing initial schedule by EDD rule, and the optimality of DDMRT to machine breakdown and new rush jobs cases when using FCFS rule to develop initial schedule.
