Production performances vs machine down times and buffer sizes: a case study
2008 (English)In: 15th International Working Seminar on Production Economics: Pre-Prints / [ed] R.W. Grubbström; H.H: Hinterhuber, 2008, Vol. 2, 511-520 p.Conference paper (Refereed)
In autumn 2007 a new production facility were inaugurated in the north of Norway. To protect business confidentiality we will refer to the company as The Company and the product as the product. This work is based on pre study of the facility. The product is mass-produced in a highly automated production system consisting of series of chemical and mechanical processes. We investigate how variation in machine down time and different sizes of intermediate buffers affects total system performance. The investigation was done using a sensitivity analysis performed in a simulation environment for discrete event systems called AutoMod. Simulation was chosen instead of an analytical analysis because of two reasons: firstly, the production system consists of series of processes that influence each other, and secondly, we want to see the effect on both long term average values and short term variation. To analyze and compare two or more system configurations, system performance metrics are needed. In cooperation with the Company, the average and the variance of input rate (parts into the system per hour), output rate (parts out of the system per hour), WIP (parts in the system) and lead time (time in minutes each part is in the system) was chosen as performance metrics. This work shows that system configurations and system decisions should be compared not only with average metrics but also by some variation metrics. Another discovery is, when analysing throughput variation in a system, input – and output rate variation is not the same.
Place, publisher, year, edition, pages
2008. Vol. 2, 511-520 p.
Research subject Industrial Logistics
IdentifiersURN: urn:nbn:se:ltu:diva-30920Local ID: 4edf76d0-65a8-4c7c-9d9a-95b9de898a73OAI: oai:DiVA.org:ltu-30920DiVA: diva2:1004149
International Working Seminar on Production Economics : 03/03/2008 - 07/03/2008
Godkänd; 2008; 20140206 (ysko)2016-09-302016-09-30Bibliographically approved