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Metaheuristiken für ein stochastisches flexibles Flow-Shop-Problem

Authors: Katzensteiner, Stefan;

Metaheuristiken für ein stochastisches flexibles Flow-Shop-Problem

Abstract

Die vorliegende Diplomarbeit untersucht das stochastische fexible Flow-Shop-Problem mit begrenztem Puffer zwischen zwei vorhandenen Stufen. Maschinenausfällen und Variation der Bearbeitungszeit werden als stochastische Einflüsse berücksichtigt. Als Zielfunktionen für die Untersuchungen dienen Maschinenauslastung, Pufferstand und durchschnittliche Fertigstellungszeit. Das Modell wird für die Auswertung mit Hilfe der Simulationssoftware AnyLogic implementiert. Anschließend werden möglichst gute Auftragsfolgen der Maschinen für konkrete Probleminstanzen mit Hilfe von Prioritätsregeln und den Metaheuristiken Variable Neighborhood Search (VNS) und Simulated Annealing (SA) bestimmt. Die Arbeit endet mit Vergleichen zwischen den angewendeten Optimierungsverfahren und Bewertungen derselben. Die Resultate zeigen, dass die Lösungen der Prioritätsregeln mit Metaheuristiken erheblich verbessert werden können.

The present thesis examines the stochastic flexible flow shop problem with a limited buffer between two defined stages. Stochastic influences occurring through machine breakdowns and variation of processing time are considered. Objective functions for the evaluations are machine utilization, buffer level and total completion time. A simulation for this model utilizing AnyLogic is described. Subsequently job sequences were calculated by dispatching rules and improved by Variable Neighborhood Search (VNS) und Simulated Annealing (SA). The thesis concludes with comparisons and ratings of the methods used. The results indicate that it is possible to improve the solutions generated by dispatching rules significantly by the use of metaheuristics.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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Average
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