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Creation, optimization and verification of a three dimensional numerical model to simulate a dragline bucket during the digging cycle using modern DEM software
Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2007.
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| Format: | Thesis |
| Language: | English |
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Stellenbosch : University of Stellenbosch
2008
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| _version_ | 1867613859459629056 |
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| access_status_str | Open Access |
| author | Dymond, Graeme Francois Dryden |
| author2 | Els, D. N. J. |
| author_browse | Dymond, Graeme Francois Dryden Els, D. N. J. |
| author_facet | Els, D. N. J. Dymond, Graeme Francois Dryden |
| author_sort | Dymond, Graeme Francois Dryden |
| collection | Thesis |
| dc_rights_str_mv | University of Stellenbosch |
| description | Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2007. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/2886 |
| institution | Stellenbosch University (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:42:50.594Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2008 |
| publishDateRange | 2008 |
| publishDateSort | 2008 |
| publisher | Stellenbosch : University of Stellenbosch |
| publisherStr | Stellenbosch : University of Stellenbosch |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/2886 Creation, optimization and verification of a three dimensional numerical model to simulate a dragline bucket during the digging cycle using modern DEM software Dymond, Graeme Francois Dryden Els, D. N. J. Coetzee, C. J. University of Stellenbosch. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering. Dissertations -- Mechanical engineering Theses -- Mechanical engineering Draglines Buckets (Excavating machinery) Mechanical and Mechatronic Engineering Thesis (MScEng (Mechanical and Mechatronic Engineering))--University of Stellenbosch, 2007. Dragline bucket designers are required to evaluate new bucket designs by building and testing scale buckets. Concerns about the reliability and accuracy of scale testing have been raised in recent years, but there was no alternative. However, recent advances in computing power and granular flow modeling are changing this and, we are entering an era where it is possible to numerically simulate dragline bucket filling. However, verification of the numerical simulation is necessary before useable data can be obtained. This thesis explains the algorithm used by modern discrete element codes to simulate granular materials. The process used to create the numerical model and calibrate the material will be discussed. An experimental test bench was also built to record experimental data for the verification the numerical model. As the project progressed it became clear that the time needed to run a single simulation dramatically limits the number of simulations that could be run. Consequently, different approaches that could reduce simulation time were also investigated. Unlike the other material parameters, there is no test that can be used to directly calibrate the damping. An array of numerical simulations were therefore conducted testing different damping schemes. The comparison performed between the numerical and experimental data showed that the numerical models could not accurately simulate the experimental measurements of the scale model dragline bucket. The numerical model did, however, predict many of the trends identified in the experimental simulation. With more realistic contact models and better computer facilities, nonetheless, it is highly probable that numerical models will be capable of simulating dragline bucket filling accurately. Further study is, therefore, justified. 2008-03-26T10:13:08Z 2010-06-01T09:00:51Z 2008-03-26T10:13:08Z 2010-06-01T09:00:51Z 2007-12 Thesis http://hdl.handle.net/10019.1/2886 en University of Stellenbosch 5189868 bytes application/pdf application/pdf Stellenbosch : University of Stellenbosch |
| spellingShingle | Dissertations -- Mechanical engineering Theses -- Mechanical engineering Draglines Buckets (Excavating machinery) Mechanical and Mechatronic Engineering Dymond, Graeme Francois Dryden Creation, optimization and verification of a three dimensional numerical model to simulate a dragline bucket during the digging cycle using modern DEM software |
| title | Creation, optimization and verification of a three dimensional numerical model to simulate a dragline bucket during the digging cycle using modern DEM software |
| title_full | Creation, optimization and verification of a three dimensional numerical model to simulate a dragline bucket during the digging cycle using modern DEM software |
| title_fullStr | Creation, optimization and verification of a three dimensional numerical model to simulate a dragline bucket during the digging cycle using modern DEM software |
| title_full_unstemmed | Creation, optimization and verification of a three dimensional numerical model to simulate a dragline bucket during the digging cycle using modern DEM software |
| title_short | Creation, optimization and verification of a three dimensional numerical model to simulate a dragline bucket during the digging cycle using modern DEM software |
| title_sort | creation optimization and verification of a three dimensional numerical model to simulate a dragline bucket during the digging cycle using modern dem software |
| topic | Dissertations -- Mechanical engineering Theses -- Mechanical engineering Draglines Buckets (Excavating machinery) Mechanical and Mechatronic Engineering |
| url | http://hdl.handle.net/10019.1/2886 |
| work_keys_str_mv | AT dymondgraemefrancoisdryden creationoptimizationandverificationofathreedimensionalnumericalmodeltosimulateadraglinebucketduringthediggingcycleusingmoderndemsoftware |