A new continuous model for multiple re‐entrant manufacturing systems

A new continuous model for multiple re‐entrant manufacturing systems

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Article ID: iaor20125943
Volume: 223
Issue: 3
Start Page Number: 659
End Page Number: 668
Publication Date: Dec 2012
Journal: European Journal of Operational Research
Authors: ,
Keywords: production, simulation: applications, queues: applications
Abstract:

The semiconductor manufacturing systems that involve a large number of products and many steps can be modeled through conservation laws for a continuous density variable on production processes. In this paper, the basic partial differential equation (PDE) models for single‐product re‐entrant manufacturing systems are proposed first. However, through the validation of numerical examples, the basic continuous models do not perform well for single‐product re‐entrant systems. Then, a new state equation that takes into account the re‐entrant degree of a product is introduced to improve the basic continuous models. The applicability of the modified continuous model is illustrated through numerical examples. The influence of the influx variation on the outflux is also discussed. With the changes of influx, the outflux has a reverse phenomenon. Based on the new state equation, the continuous model for multi‐product re‐entrant systems with different priorities is established, and an example is provided to illustrate the applicability of the new continuous model.

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