Performance evaluation of transfer lines with general repair times and multiple failure modes |
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Authors: | Marcello Colledani Tullio Tolio |
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Institution: | 1.Politecnico di Milano,Department of Mechanical Engineering,Milan,Italy |
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Abstract: | The paper proposes a decomposition method for evaluating the performance of transfer lines where machines can fail in multiple
modes and can be repaired with non-exponential times. Indeed, while times to machine failure can be often modeled using exponential
distributions with acceptable accuracy, times to repair are very rarely observed to be exponentially distributed in actual
systems. This feature limits the applicability of existing approximate analytical methods to real production lines. In this
paper, the discrete acyclic phase-type distribution is used to model the repair process, for each failure mode of the machines
composing the system. The exact analysis of the two-machine system is used as a building block for the decomposition method,
proposed to study multi-stage lines. Numerical results show the high accuracy of the developed method in estimating the average
throughput and buffer levels. |
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Keywords: | |
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