Browsing by Author "Sheehan, Erin"

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    A simulation-based method for improving material efficiency within the constraints of existing production systems
    (Stuttgart : Fraunhofer Verlag, 2018) Sheehan, Erin; Sauer, Alexander (Univ.-Prof. Dr.-Ing. Dipl.-Kfm.)
    With increasing material and labor costs, manufacturers seek to increase material yield in existing production systems without sacrificing logistical performance. However due to a lack of understanding of the material waste causality and its interdependencies, localized and isolated material efficiency efforts are commonplace. To enable manufacturers to select the best-suited instruments for holistic material efficiency, this thesis presents a simulation-based method, modelling the causality of material waste parallel to manufacturing performance. An Ishikawa analysis of twelve material waste forms addresses the need for deeper understanding of material waste causation. Through abstraction, four types of causes are identified: those setting the frequency and duration of waste-linked activities, those determining the amount of waste per activity, or unnecessarily linking waste to an activity. Based on this finding, the author adapts existing resource consumption modelling structures, e.g. machine operating states, to industrial waste. A model of the factory is developed to illustrate the mechanisms for controlling material waste. The developed procedure begins with a current state survey to examine the relation between material waste and activities of the factory. A systematic method allows the user to generate a list of improvement scenarios. The effectiveness of the improvement measures is investigated in dynamic production simulation (system dynamics).