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Slamming analysis of skips in mine shafts: the effect of secondary stiffening in the guides
Previous investigations into the dynamics of skips in deep mine shafts have led to the identification of slamming as a phenomenon that results in exceptionally high forces in the shaft steelwork and conveyance. Slamming may occur when the rollers on the skip, that normally act on the guide, fail. Po...
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| Format: | Thesis |
| Language: | English |
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Department of Mechanical Engineering
2016
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| _version_ | 1867614432366952448 |
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| access_status_str | Open Access |
| author | D'Arcy, Evans A |
| author2 | Pearce, Howard |
| author_browse | D'Arcy, Evans A Pearce, Howard |
| author_facet | Pearce, Howard D'Arcy, Evans A |
| author_sort | D'Arcy, Evans A |
| collection | Thesis |
| description | Previous investigations into the dynamics of skips in deep mine shafts have led to the identification of slamming as a phenomenon that results in exceptionally high forces in the shaft steelwork and conveyance. Slamming may occur when the rollers on the skip, that normally act on the guide, fail. Possible damage caused to the shaft steelwork, as a result of slamming, limits the hoisting speed of the skip. This study extends previous work by investigating the effect of secondary stiffening, due to axial tension effects as the guide deforms, on the slamming response of the skip. A mathematical model of a single slamming event is formulated and a numerical solution procedure presented. A number of computer simulations, including parametric studies, are presented. An important conclusion is that previous slamming models were shown to predict a reduced response when low axial compressive forces are present in the guides while predicting an increased response for high (near the buckling load) axial compressive forces. The inclusion of secondary stiffening; due to axial tension effects, thus represents a significant refinement of the slamming model. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/22159 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:51:57.098Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| publisher | Department of Mechanical Engineering |
| publisherStr | Department of Mechanical Engineering |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/22159 Slamming analysis of skips in mine shafts: the effect of secondary stiffening in the guides D'Arcy, Evans A Pearce, Howard Mechanical Engineering Previous investigations into the dynamics of skips in deep mine shafts have led to the identification of slamming as a phenomenon that results in exceptionally high forces in the shaft steelwork and conveyance. Slamming may occur when the rollers on the skip, that normally act on the guide, fail. Possible damage caused to the shaft steelwork, as a result of slamming, limits the hoisting speed of the skip. This study extends previous work by investigating the effect of secondary stiffening, due to axial tension effects as the guide deforms, on the slamming response of the skip. A mathematical model of a single slamming event is formulated and a numerical solution procedure presented. A number of computer simulations, including parametric studies, are presented. An important conclusion is that previous slamming models were shown to predict a reduced response when low axial compressive forces are present in the guides while predicting an increased response for high (near the buckling load) axial compressive forces. The inclusion of secondary stiffening; due to axial tension effects, thus represents a significant refinement of the slamming model. 2016-10-16T09:50:51Z 2016-10-16T09:50:51Z 1991 Master Thesis Masters MSc (Eng) http://hdl.handle.net/11427/22159 eng application/pdf Department of Mechanical Engineering Faculty of Engineering and the Built Environment University of Cape Town |
| spellingShingle | Mechanical Engineering D'Arcy, Evans A Slamming analysis of skips in mine shafts: the effect of secondary stiffening in the guides |
| thesis_degree_str | Master's |
| title | Slamming analysis of skips in mine shafts: the effect of secondary stiffening in the guides |
| title_full | Slamming analysis of skips in mine shafts: the effect of secondary stiffening in the guides |
| title_fullStr | Slamming analysis of skips in mine shafts: the effect of secondary stiffening in the guides |
| title_full_unstemmed | Slamming analysis of skips in mine shafts: the effect of secondary stiffening in the guides |
| title_short | Slamming analysis of skips in mine shafts: the effect of secondary stiffening in the guides |
| title_sort | slamming analysis of skips in mine shafts the effect of secondary stiffening in the guides |
| topic | Mechanical Engineering |
| url | http://hdl.handle.net/11427/22159 |
| work_keys_str_mv | AT darcyevansa slamminganalysisofskipsinmineshaftstheeffectofsecondarystiffeningintheguides |