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Dimensioning buffers with discrete-event simulation
2002 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

This thesis is the final examination for a Master of Science in Mechanical Engineering at Luleå University of Technology. The report covers a simulation project with the aim of dimensioning intermittent buffers for a manufacturing flow at Ferruform AB. Ferruform AB is a subcontractor in the truck, bus and coach industry and the simulation study was focused on the first section of the manufacturing flow for rear axles. The model was developed in Simul8 and comprised not only the manufacturing flow, but also the flow of information in the planning system. The study focused on day-to-day operational conditions and disturbances associated with planned stops or unusually long and irregular stops were ignored. The experimentation showed that there was only slight improvement to be gained through the introduction of buffers. The sensitivity analysis showed that the result was robust and that substantial improvement would be needed before affecting the result. However, internal efficiency reports showed that the weekly variance of the input data was substantial and that the result was valid for some weeks, but not all. The inconclusive result was a disappointment, but the advantage of a simulation model is that it can be reused whenever new input data is available. The model has been constructed with the aim of enhancing the accessibility of the decision variables and they are therefore modified through an Excel spreadsheet. Reusing the model in a buffer-dimensioning context only requires limited Simul8 skills. The model is complex and could also be reused for other purposes than dimensioning buffers, although modifying the structure of the model would require a skilled user. The main obstacle to overcome before a simulation model can be efficiently used as an operational tool is the availability of representative data. A systematic approach to data collection with frequent updates is therefore recommended.

Place, publisher, year, edition, pages
Keyword [en]
Technology, Discrete-event, simulation, Buffer, Simul8
Keyword [sv]
URN: urn:nbn:se:ltu:diva-48665ISRN: LTU-EX--02/082--SELocal ID: 6179376f-909c-4a27-b818-66c2c75b7b7cOAI: diva2:1022008
Subject / course
Student thesis, at least 30 credits
Educational program
Mechanical Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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