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Reactive Event-Driven Rescheduling using Expanding Time Windows

Buursema, K. (2025) Reactive Event-Driven Rescheduling using Expanding Time Windows.

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Abstract:HTM Aerotec manufactures high-precision aerospace components, where disruptions such as machine failures or operator absences often render production schedules infeasible. This research presents a practical and time-efficient rescheduling model to mitigate such disruptions for 5-axis machines within a flexible machining cell. The model combines a best-fit insertion strategy and an event-based approach using expanding time windows. Four best-fit methods were developed to balance tardiness and schedule stability, with the "similar timeslot" method proving most effective in HTM Aerotec’s context. To limit computation time, the algorithm progressively expands the rescheduling scope based on the disruption duration, employing a percentage-based time window expansion strategy. Experimental validation with real production data across 30 disruption scenarios showed that the model produces feasible schedules within a 60-second runtime, achieving up to 75% utilisation when disruptions occur early. While it cannot match the theoretical efficiency of the original schedule, the model achieves target production times. The model is generalisable to other flexible machining environments and integrates with HTM Aerotec’s ERP and fixture databases. A bi-weekly scheduling cycle and structured disruption response are recommended for effective implementation, along with stakeholder engagement to ensure practical adoption and continuous improvement.
Item Type:Essay (Master)
Faculty:BMS: Behavioural, Management and Social Sciences
Subject:30 exact sciences in general, 58 process technology
Programme:Industrial Engineering and Management MSc (60029)
Link to this item:https://purl.utwente.nl/essays/106604
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