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A BACKLOG REDUCTION METHOD BY MINIMIZING TOTAL WEIGHTED TARDINESS IN CONWIP PRODUCTION SYSTEMS

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Author(s): TAHER TAHERIAN | MOHAMMAD MOHAMMADI | SAMIRA BAIRAMZADEH

Journal: International Journal of Engineering Science and Technology
ISSN 0975-5462

Volume: 4;
Issue: 2;
Start page: 493;
Date: 2012;
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Keywords: Scheduling | Constant Work in Process | Make to Order Systems | Work-Ahead-Window.

ABSTRACT
Reducing the number of backlogs in a MTO production system is very vital in a competitive market. This article tries to develop a method to find appropriate weights for a scheduling oriented objective function and improve a method to minimize the backlog quantities in a make to order production system and CONWIP controlled production considering a scheduling oriented method. This method can be applied to minimize the backlog area by changing the delivery sequences of orders. When the sequences are changed, it causes changes in some order delivery specifications, such delivery lead time of a customer order that can prevent the tardiness in delivery lead time. Studying the statistical behavior of customer orders we will analyze the effect of applying this method on backlog quantities. Using a multi criteria weighting calculation method, Shannon’s Entropy Method, we will calculate the appropriate weights to apply in minimizing the weighted scheduling objective function. A case study has represented in last section of the paper that is suitable to execute in firms with CONWIP production system and for each product.
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