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Economic Batch Quantity (EBQ) for a Single-Stage Production System with Rework and Scrapping

Rahmani, Vasim | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39641 (01)
  4. University: Sharif University of Technology
  5. Department: Industrial Engineering
  6. Advisor(s): Haji, Rasoul
  7. Abstract:
  8. The classical economic batch quantity (EBQ) model assumes that all produced items have a perfect quality. But in real-life production systems, generation of defective items is inevitable. A portion of these defective items is considered to be scrap , while the other is assumed to be reworkable and reworking them can reduce costs and increase productivity. In this thesis we have studied the economic batch quantity for a single stage production system with rework and scrapping . We want to satisfy the customer demand and minimize total costs of the system like set up costs , production costs , rework costs , holding costs , shortage costs and scrapping costs . In the first chapter of this thesis we have studied the literature. In the next three chapters we have developed three models about the context of this thesis. In first model , the portion of defective items is constant and a set up time is considered to rework defective items. In second model , the portion of defective items is a random variable with a known probability density function and shortage (backorder) is assumed to be allowable. In third model , the portion of defective items is alike the second model. In this model , defective items from each cycle are accumulated until N cycles are completed after which the defective parts are reworked. The object of this model is to find the optimum number of sycles before reworking and the economic bath quantity for each sycle .


  9. Keywords:
  10. Rework ; Scraps ; Economic Batch Quantity ; Single-Stage Production ; Defective Items ; Reworkable Items

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