İÇ LOJİSTİK SİSTEMİNDE MALZEME TEDARİĞİ İÇİN GELİŞTİRİLMİŞ MATEMATİKSEL MODELLEME YAKLAŞIMI: BİR UYGULAMA

Abstract

Bu çalışmada, bir otomotiv yan sanayi firmasına ait fabrika içi lojistiğindeki malzeme tedariği problemi dikkate alınmıştır. Çalışmanın amacı, makinelere malzeme tedariği yaparken hat yanı stok miktarını ve taşıma maliyetlerini en küçükleyerek katma değersiz işleri azaltmaktır. Firmaya ait malzeme tedariği problemi için iki farklı senaryo dikkate alınmış ve her senaryo iki aşamalı olarak değerlendirilmiştir. Her senaryonun birinci aşamasında, malzeme tedariği yapacak araç için toplam dolaşım mesafesini en aza indirecek araç rotası oluşturulmuştur. İkinci aşamada ise, birinci aşamada elde edilen rota kullanılarak hat yanı stok miktarları ve araç kapasite kısıtı dikkate alınarak malzeme tedarik planlaması gerçekleştirilmiştir. Her bir aşamanın çözümü için karışık tamsayılı doğrusal programlama modeli geliştirilmiştir. Yapılan sayısal çalışmalar sonucunda, geliştirilen çözüm yaklaşımının firmada kullanılması durumunda taşıma aracının etkinliğindeki artış ile stok maliyeti, taşıma maliyeti ve katma değersiz işlerden doğan maliyetlerdeki azalmalar ortaya konmuştur.

Keywords

• Araç rotalama,Malzeme tedariği,Lojistik,matematiksel modelleme

Mathematical Model Approach for Material Supply in In-Plant Logistics System: A Case Study

Abstract

In this paper a material supply problem of an automotive subsidiary company is considered. The aim of the study is to reduce non-value-added works by minimizing the transportation cost and inventory amounts at the production area while delivering the materials to machines. Two cases are taken into account for the material supply problem of the company, and each case is examined in two stages. In the first stage of each case, a fixed route plan of the handling truck is formed to reduce total travelled distance. In the second stage, regarding the truck capacity and inventory amounts at the production area, the material supply planning is realized by using the route plan of the truck found in the first stage. To solve each stage, a mixed integer mathematical model is proposed. As a result of the computational studies, improvements on the truck utilization and reduction on the inventory cost, transportation cost, and cost of other non-value-added works are indicated in case of the application of the proposed solution approach in the company.

Keywords

• Vehicle routing,Material supply,In-plant logistics,Mathematical modeling

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