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

Year 2018, Volume: 23 Issue: 4, 159 - 176, 31.12.2018

İlker Küçükoğlu , Betül Yağmahan , Müge Sinem Çağlıyan Ayşen Yıldız Dilan Aktokluk

https://doi.org/10.17482/uumfd.455198

Cited By: 2

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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