Lot-sizing two-echelon assembly systems with random yields and rigid demand

Lot-sizing two-echelon assembly systems with random yields and rigid demand

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Article ID: iaor20083579
Country: Netherlands
Volume: 173
Issue: 2
Start Page Number: 600
End Page Number: 616
Publication Date: Sep 2006
Journal: European Journal of Operational Research
Authors: , ,
Keywords: production
Abstract:

We consider a two-echelon assembly system producing a single final product for which the demand is known. The first echelon consists of several parallel stages, whereas the second echelon consists of a single assembly stage. We assume that the yield at each stage is random and that demand needs to be satisfied in its entirety; thus, several production runs may be required. A production policy should specify, for each possible configuration of intermediate inventories, on which stage to produce next and the lot size to be processed. The objective is to minimize the expected total of setup and variable production costs. We prove that the expected cost of any production policy can be calculated by solving a finite set of linear equations whose solution is unique. The result is general in that it applies to any yield distribution. We also develop efficient algorithms leading to heuristic solutions with high precision and, as an example, provide numerical results for binomial yields.

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