Opportunistic retooling of a flexible machine subject to failure

Opportunistic retooling of a flexible machine subject to failure

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Article ID: iaor20013346
Country: United States
Volume: 48
Issue: 1
Start Page Number: 79
End Page Number: 97
Publication Date: Feb 2001
Journal: Naval Research Logistics
Authors: ,
Keywords: quality & reliability
Abstract:

A set of jobs can be processed without interruption by a flexible machine only if the set of tools required by all jobs can be loaded in the tool magazine. However, in practice the total number of tools required by a job set would exceed the tool magazine capacity. In such situations, the job set has to be carefully partitioned at the start of the production run such that each partition can be processed without interruption. During the production run, if there are unscheduled machine downtimes due to machine failure, this provides an additional opportunity to optimally retool the magazine for a smaller job set consisting of just the unprocessed jobs. In this paper, we study job sequencing rules that allow us to minimize the total expected cost of machine down time due to machine failures and magazine retooling, assuming a dynamic re-sequencing of the unprocessed jobs after each machine failure. Using these rules, we develop a branch-and-bound heuristic that allows us to solve problems of reasonable size.

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