Robust Optimization Model for Production Planning Problem under Uncertainty

Yıl 2017, Cilt: 4 Sayı: 1, 55 - 76, 15.01.2017

Pembe Güçlü , Ali Özdemir

https://doi.org/10.17541/optimum.285050

Öz

Conditions
of businesses change very quickly. To take into account the uncertainty
engendered by changes has become almost a rule while planning. Robust optimization
techniques that are methods of handling uncertainty ensure to produce less
sensitive results to changing conditions. Production planning, is to decide
from which product, when and how much will be produced, with a most basic
definition. Modeling and solution of the Production planning problems changes
depending on structure of the production processes, parameters and variables.
In this paper, it is aimed to generate and apply scenario based robust
optimization model for capacitated two-stage multi-product production planning
problem under parameter and demand uncertainty. With this purpose, production
planning problem of a textile company that operate in İzmir has been modeled
and solved, then deterministic scenarios’ and robust method’s results have been
compared. Robust method has provided a production plan that has higher cost
but, will result close to feasible and optimal for most of the different
scenarios in the future.

Anahtar Kelimeler

Robust Optimization, Production Planning, Uncertainty

Belirsizlik Altında Üretim Planlaması Problemi için Robust Eniyileme Modeli

Öz

İşletmelerin içinde
bulundukları şartlar oldukça hızlı bir şekilde değişmektedir. Planlama
yapılırken değişimin doğurduğu belirsizliği hesaba katmak adeta bir kural
haline gelmiştir. Belirsizliği ele alma yöntemlerinden olan robust eniyileme
teknikleri, değişen koşullara daha az duyarlı sonuçlar üreten modellerin
oluşturulmasını sağlamaktadır. Üretim planlaması en basit anlamda hangi
üründen, ne zaman, ne kadar üretileceğine karar verilmesidir. Üretim planlama
problemlerinin modellenmesi ve çözümü üretim sürecinin, ele alınan
parametrelerin ve değişkenlerin yapısına bağlı olarak farklılık göstermektedir.
Bu çalışmada parametre ve talep belirsizliği altında, kapasite kısıtlı iki
aşamalı, çok ürünlü üretim planlaması problemi için eniyileme modelinin
oluşturulması ve çözülmesi amaçlanmıştır. Bu amaçla İzmir’de faaliyet gösteren
bir tekstil firmasının üretim planlama problemi modellenerek çözülmüş, robust
modelin sonuçları ile deterministik senaryoların sonuçları karşılaştırılmıştır.
Robust yöntem, daha yüksek maliyetli ancak gelecekte karşılaşılabilecek farklı
senaryoların çoğunluğunda büyük ölçüde olurlu ve optimale yakın sonuçlar
verecek, sağlam bir üretim planı sunmuştur.

Anahtar Kelimeler

Robust Eniyileme, Üretim Planlaması, Belirsizlik

Kaynakça

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