Analysis of Random Disturbances on Shop Floor in Modern Steel Production Dynamic Environment

In steel production practice, frequent deviations from a predictive schedule occur when the shop floor experiences various unexpected disturbances and render the schedules inefficient. In this paper, the typical disturbances and their effects on shop floor are studied comprehensively. The general repair procedures are put forward and can be simplified into four generic repair steps which can be used solely or in combination to repair a disruption. These disturbances can be treated as machine failure by virtue of the basic repair steps. Then a repair strategy based on conflict identification and elimination for machine failure is analyzed in detail. At last, a theorem is put forward for proving that a feasible rescheduling scheme can be found by the repair strategy for machine failure. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Harbin University of Science and Technology