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An investigation into the relationship between vertical and lateral forces, speed and superelevation in railway curves
Dissertation (MEng)--University of Pretoria, 2016.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2017
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| _version_ | 1867613533153263616 |
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| access_status_str | Open Access |
| author2 | Grabe, P.J. (Hannes) |
| author_browse | Grabe, P.J. (Hannes) |
| author_facet | Grabe, P.J. (Hannes) |
| collection | Thesis |
| dc_rights_str_mv | © 2017 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MEng)--University of Pretoria, 2016. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/59440 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:37:39.235Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/59440 An investigation into the relationship between vertical and lateral forces, speed and superelevation in railway curves Grabe, P.J. (Hannes) Powell, Alexander Frank Wheel/Rail Interaction UCTD Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-11 SDG-11: Sustainable cities and communities Engineering, built environment and information technology theses SDG-13 SDG-13: Climate action Dissertation (MEng)--University of Pretoria, 2016. The Gautrain Rapid Rail Link (GRRL) is a rail transit system in South Africa that links Johannesburg and Pretoria, as well as Johannesburg and the O.R. Tambo International Airport. Travelling at speeds of up to 160 km/h, the Gautrain system is the first of its kind on the African continent. This dissertation covers an investigation into the relationship between the vertical and lateral forces, speed and superelevation in a GRRL curve. The research described in this dissertation is based on an experiment which involved running a test train through a curve at various speeds, changing the cant of the curve by tamping and repeating the train runs. The cant was changed due to high wheel wear rates. The curve already had a cant deficiency, and this cant deficiency was subsequently increased by reducing the curve’s cant. Assessing the before and after tamping test data validated the existence of the expected relationships between the vertical and lateral rail forces, the speed and the cant. The change in cant had a minimal effect on the magnitude of the vertical forces, although a transfer of loading between the high and low legs did occur. The theory indicates that the 14 % reduction in cant in this curve given all of the other curve characteristics should have resulted in an increase in the lateral forces. There was however a roughly 50 % reduction in the maximum lateral forces after the cant was reduced that can be explained from a train dynamics point of view. In addition, there was an increase in safety due to a reduced derailment ratio at this curve’s normal operating speed of 85 km/h. It is not unreasonable to presume that a 50 % reduction in the maximum lateral forces could lead to a halving of the wear rate of the rail and wheels in this curve with similar results to be expected in other curves on the rail network. The Chair in Railway Engineering at the University of Pretoria Civil Engineering MEng Unrestricted 2017-03-16T06:46:37Z 2017-03-16T06:46:37Z 2017-04-20 2016 Dissertation Powell, AF 2016, An investigation into the relationship between vertical and lateral forces, speed and superelevation in railway curves, MEng Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/59440> A2017 http://hdl.handle.net/2263/59440 en © 2017 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | Wheel/Rail Interaction UCTD Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-11 SDG-11: Sustainable cities and communities Engineering, built environment and information technology theses SDG-13 SDG-13: Climate action An investigation into the relationship between vertical and lateral forces, speed and superelevation in railway curves |
| title | An investigation into the relationship between vertical and lateral forces, speed and superelevation in railway curves |
| title_full | An investigation into the relationship between vertical and lateral forces, speed and superelevation in railway curves |
| title_fullStr | An investigation into the relationship between vertical and lateral forces, speed and superelevation in railway curves |
| title_full_unstemmed | An investigation into the relationship between vertical and lateral forces, speed and superelevation in railway curves |
| title_short | An investigation into the relationship between vertical and lateral forces, speed and superelevation in railway curves |
| title_sort | investigation into the relationship between vertical and lateral forces speed and superelevation in railway curves |
| topic | Wheel/Rail Interaction UCTD Engineering, built environment and information technology theses SDG-09 SDG-09: Industry, innovation and infrastructure Engineering, built environment and information technology theses SDG-11 SDG-11: Sustainable cities and communities Engineering, built environment and information technology theses SDG-13 SDG-13: Climate action |
| url | http://hdl.handle.net/2263/59440 |