Models of automatic transfer lines with inventory banks a review and comparison

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Abstract
The purpose of this paper is to evaluate and compare past models of transfer lines. After a discussion of the nature of transfer lines and their stoppages, the assumptions and derivations of seven analytical models are compared. The major discrepancies in assumptions concern whether failures are time dependent or operation dependent. The comparison of derivations includes a translation of all results to a common set of symbols. The predictions of the models at various banking levels are observed to vary significantly. Model validation is discussed in two phases. First the validity of the assumptions is tested by real data from a transfer line. The major problem is the failure of the real data to satisfy the assumptions of the model. Finally, the predictions of the analytical models are compared with a simulation model which uses the actual data. The difference between analytical and simulation models was found to be significant.

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