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Optimering av leverantörsval: En studie av Spinactor ABs leverantörsval vid byggnationsprojekt på olika orter i Sverige.
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Optimization and Systems Theory.
KTH, School of Engineering Sciences (SCI), Mathematics (Dept.), Optimization and Systems Theory.
2014 (Swedish)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesisAlternative title
Optimization of supplier selection (English)
Abstract [sv]

Detta arbete presenterar enmatematisk optimeringsmodell gällande val av Prefableverantör för Spinactor ABmed avseende på inköpspris med volymrabatt samt transportkostnad. Utöver dettatillkommer en kvalitativ undersökning om vilka andra kriterier som ärbetydelsefulla vid leverantörsavtal. De viktigaste kriterier applicerades i enegenutvecklad leverantörsvalsmodell som bygger på ramverket ”total cost of ownership”(TCO) där leverantörskriterierna kvantifieras. Utifrån kriterieanalysenframgick att de tre viktigare leverantörskriterierna för Spinactor AB idagsläget är leveransprecision, kundservice och kommunikation samt ekonomiskstabilitet.Lösningen av optimeringsproblemet genomfördes med två olika metoder,linjärprogrammering samt heltalsprogrammering, där linjärprogrammering vardominerande i lösningstid. Optimeringsresultatet visade på atttransportkostnaden är en viktig faktor för totalkostnaden eftersom en optimalallokering innebär att fem utav sex möjliga leverantörer skall användas vidinköp. Vår rekommendation till Spinactor är därför att använda flertalet lokalaleverantörer vid inköpa av Prefab.

Abstract [en]

Thispaper presents a mathematical optimization model concerning Prefab supplier selectionfor Spinactor AB with respect to the purchase price, volume discounts and transportationcost. Furthermore, it includes a qualitative study regarding supplier selectioncriteria. We identified the most important supplier criteria for Spinactor and developeda supplier selection model, based on the framework “total cost of ownership”(TCO), where those criteria were quantified. It was concluded that the threemost important supplier criteria for Spinactor AB, in the current situation, isdelivery performance, customer service and communication, and economicstability. The solution of the optimization problem was implemented using twodifferent methods, linear programming and integer programming, where linearprogramming was dominant in computational time. The optimization results showedthat the transportation cost is an important element in the total cost since anoptimal allocation suggests that five out of six potential suppliers should becontracted. Thus, our recommendation to Spinactor is to contract several localsuppliers for the initial purchasing of Prefab.

Place, publisher, year, edition, pages
2014.
Series
TRITA-MAT-K, 2014:12
National Category
Mathematical Analysis
Identifiers
URN: urn:nbn:se:kth:diva-146889OAI: oai:DiVA.org:kth-146889DiVA: diva2:726182
Subject / course
Optimization and Systems Theory
Educational program
Master of Science in Engineering - Industrial Engineering and Management
Supervisors
Examiners
Available from: 2014-06-17 Created: 2014-06-17 Last updated: 2014-06-17Bibliographically approved

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