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Cost-Based Scheduling of Workers and Equipment in a Fabrication and Assembly Shop

Author

Listed:
  • Bruce Faaland

    (University of Washington, Seattle, Washington)

  • Tom Schmitt

    (University of Washington, Seattle, Washington)

Abstract

Many manufacturing firms that use Material Requirements Planning (MRP) cannot deliver products on schedule and within budget. Faced with bewildering bottlenecks, erratic process flows, and unrealistic due dates, they are unable to develop accurate schedules for their raw material acquisitions, workforce, and equipment. Their MRP plans must be translated into a workable schedule, one which determines when individual tasks will be performed by workers at work centers. There is a clear need for such an enhancement to MRP, a means to operate on detailed task data, yet capable of producing a schedule that directly relates to the MRP plan, the master production schedule, and the resource plan. We describe a method for determining feasible and cost-effective schedules for both labor and machines in a job shop. The method first sequences tasks at resources and then minimizes overall earliness and lateness cost by solving a series of maximum flow problems. By using the model as an enhancement to a company's MRP system, we simulated the cost effects of redeploying its workforce. Although the model was not used for real-time scheduling, it served a strategic role in workforce expansion and deployment decisions.

Suggested Citation

  • Bruce Faaland & Tom Schmitt, 1993. "Cost-Based Scheduling of Workers and Equipment in a Fabrication and Assembly Shop," Operations Research, INFORMS, vol. 41(2), pages 253-268, April.
    • Handle: RePEc:inm:oropre:v:41:y:1993:i:2:p:253-268
    DOI: 10.1287/opre.41.2.253
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    Citations

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    Cited by:

    1. Gang Yu & Julian Pachon & Benjamin Thengvall & Darryal Chandler & Al Wilson, 2004. "Optimizing Pilot Planning and Training for Continental Airlines," Interfaces, INFORMS, vol. 34(4), pages 253-264, August.
    2. John J. Kanet & V. Sridharan, 2000. "Scheduling with Inserted Idle Time: Problem Taxonomy and Literature Review," Operations Research, INFORMS, vol. 48(1), pages 99-110, February.
    3. Kolisch, Rainer, 1998. "Integrated scheduling, assembly area- and part-assignment for large scale, make-to-order assemblies," Manuskripte aus den Instituten für Betriebswirtschaftslehre der Universität Kiel 468, Christian-Albrechts-Universität zu Kiel, Institut für Betriebswirtschaftslehre.
    4. Ernst, A. T. & Jiang, H. & Krishnamoorthy, M. & Sier, D., 2004. "Staff scheduling and rostering: A review of applications, methods and models," European Journal of Operational Research, Elsevier, vol. 153(1), pages 3-27, February.
    5. Dalia Attia & Reinhard Bürgy & Guy Desaulniers & François Soumis, 2019. "A decomposition-based heuristic for large employee scheduling problems with inter-department transfers," EURO Journal on Computational Optimization, Springer;EURO - The Association of European Operational Research Societies, vol. 7(4), pages 325-357, December.
    6. Kolisch, R., 2000. "Integrated scheduling, assembly area- and part-assignment for large-scale, make-to-order assemblies," International Journal of Production Economics, Elsevier, vol. 64(1-3), pages 127-141, March.

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