MAKESPAN COMPARISON BETWEEN RESEQUENCING AND SWITCHING IN A DYNAMIC MANUFACTURING ENVIRONMENT

Makespan performance capabilities, using dispatching, fixed sequencing , resequencing and switching as a scheduling approach, are compared in a general job shop setting. Switching is defined as an approach that changes fixed sequencing to dispatching, considering the manufacturing status. Two stages of simulation experiments were conducted under sev eral intensity levels of machine breakdown occurrences and rush job ar rivals. The first experiment clarifies that resequencing is superior t o fixed sequencing and that switching is superior to dispatching. The second experiment, comparison between resequencing and switching, indi cates that switching can dominate resequencing with no short re-sequen cing intervals under high disturbance intensity levels.