The use of simulation as a decision tool for improvements in sawmill manufacturing

A simulation study was used to analyze the flow of products though a sawmill in order to determine where productivity improvements could be made. The sawmill analyzed is located in the interior of British Columbia, and processes a variety of species and products. The mill was selected for this reas...

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Main Author: Thoews, Steven Eric
Language:English
Published: University of British Columbia 2008
Subjects:
DES
Online Access:http://hdl.handle.net/2429/619
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spelling ndltd-LACETR-oai-collectionscanada.gc.ca-BVAU.2429-6192014-03-26T03:34:53Z The use of simulation as a decision tool for improvements in sawmill manufacturing Thoews, Steven Eric Sawmill Simulation DES Arena A simulation study was used to analyze the flow of products though a sawmill in order to determine where productivity improvements could be made. The sawmill analyzed is located in the interior of British Columbia, and processes a variety of species and products. The mill was selected for this reason, as it was important to determine how a change in the process will affect the piece flow and production of the various species. A simulation model of the mill was developed using the Arena 8.0 discrete event simulation software developed by Rockwell Automation. Data consisting of mill layout and flow, breakdown patterns, machine process times and downtimes, conveyor speeds, and buffer capacities were collected from the sawmill. This information was used to layout the framework in a conceptual model. The conceptual model was then used to develop the simulation model in Arena. A face validity test, combined with comparisons of model output to actual mill output was used to determine the validity of the model. After running several different scenarios processing Larch, White pine, and Ponderosa pine, it was discovered that the trimmer was the system bottleneck when both the small log and large log lines were running throughout the shift. Running under base case conditions, the model predicted an average board output of 13,147 boards. An increase in the processing capability of the trimmer resulted in the bottleneck to shift to the edger from the small log line. The OptQuest Analyzer program bundled with the Arena software was used to further analyze the shift in bottleneck to the edger from the small log line. By allowing the program to manipulate machine settings for the trimmer and edger, it was able to maximize the average board output to 17,996 boards per shift when no edger set up times were considered. If the edger setup times are used, the average board output dropped to 16,708 boards per shift. These findings were presented to the sawmill management and based on the study, they proceeded to make improvements at the trimmer. The improvements resulted in an increase of 10% to sawmill output. 2008-03-31T21:11:48Z 2008-03-31T21:11:48Z 2008 2008-03-31T21:11:48Z 2008-05 Electronic Thesis or Dissertation http://hdl.handle.net/2429/619 eng University of British Columbia
collection NDLTD
language English
sources NDLTD
topic Sawmill
Simulation
DES
Arena
spellingShingle Sawmill
Simulation
DES
Arena
Thoews, Steven Eric
The use of simulation as a decision tool for improvements in sawmill manufacturing
description A simulation study was used to analyze the flow of products though a sawmill in order to determine where productivity improvements could be made. The sawmill analyzed is located in the interior of British Columbia, and processes a variety of species and products. The mill was selected for this reason, as it was important to determine how a change in the process will affect the piece flow and production of the various species. A simulation model of the mill was developed using the Arena 8.0 discrete event simulation software developed by Rockwell Automation. Data consisting of mill layout and flow, breakdown patterns, machine process times and downtimes, conveyor speeds, and buffer capacities were collected from the sawmill. This information was used to layout the framework in a conceptual model. The conceptual model was then used to develop the simulation model in Arena. A face validity test, combined with comparisons of model output to actual mill output was used to determine the validity of the model. After running several different scenarios processing Larch, White pine, and Ponderosa pine, it was discovered that the trimmer was the system bottleneck when both the small log and large log lines were running throughout the shift. Running under base case conditions, the model predicted an average board output of 13,147 boards. An increase in the processing capability of the trimmer resulted in the bottleneck to shift to the edger from the small log line. The OptQuest Analyzer program bundled with the Arena software was used to further analyze the shift in bottleneck to the edger from the small log line. By allowing the program to manipulate machine settings for the trimmer and edger, it was able to maximize the average board output to 17,996 boards per shift when no edger set up times were considered. If the edger setup times are used, the average board output dropped to 16,708 boards per shift. These findings were presented to the sawmill management and based on the study, they proceeded to make improvements at the trimmer. The improvements resulted in an increase of 10% to sawmill output.
author Thoews, Steven Eric
author_facet Thoews, Steven Eric
author_sort Thoews, Steven Eric
title The use of simulation as a decision tool for improvements in sawmill manufacturing
title_short The use of simulation as a decision tool for improvements in sawmill manufacturing
title_full The use of simulation as a decision tool for improvements in sawmill manufacturing
title_fullStr The use of simulation as a decision tool for improvements in sawmill manufacturing
title_full_unstemmed The use of simulation as a decision tool for improvements in sawmill manufacturing
title_sort use of simulation as a decision tool for improvements in sawmill manufacturing
publisher University of British Columbia
publishDate 2008
url http://hdl.handle.net/2429/619
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