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Untripped manoeuvre induced rollover prevention for sport utility vehicles
Dissertation (MEng)--University of Pretoria, 2018.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2018
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| _version_ | 1867613664770523136 |
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| access_status_str | Open Access |
| author2 | Els, P.S. (Pieter Schalk) |
| author_browse | Els, P.S. (Pieter Schalk) |
| author_facet | Els, P.S. (Pieter Schalk) |
| collection | Thesis |
| dc_rights_str_mv | © 2018 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, 2018. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/67958 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:39:45.040Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| 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:2263/67958 Untripped manoeuvre induced rollover prevention for sport utility vehicles Els, P.S. (Pieter Schalk) u28275366@tuks.co.za Wehrmeyer, Vincent Hermann Unrestricted UCTD Untripped manoeuvre Untripped rollover sport utility vehicles (SUVs) Rollover prevention Engineering, built environment and information technology theses SDG-03 SDG-03: Good health and well-being 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 Dissertation (MEng)--University of Pretoria, 2018. Rollover accidents account for a high number of serious injuries and fatalities and thus it is greatly important to reduce the number of occurrences. Although a large number of rollovers result from factors external to the vehicle design such as environmental obstacles there is a significant portion of rollover accidents which are preventable. On-road untripped rollovers are directly related to the vehicle design. It is possible to do work in this area to improve vehicle-related safety factors. During rollover, lateral acceleration acts on the centre of gravity of the vehicle over turning it about the outer wheels. Thus the method to reduce or prevent rollover of this study stemmed from decreasing the overturning moment by reducing the movement arm though which the lateral acceleration acts. This is achieved by lower the ride height of the test vehicle using slow active suspension control of the test vehicle (Land Rover Defender 110) fitted with a hydro-pneumatic suspension system. An experimental validated mathematical model representing the test vehicle is created to develop a rollover prevention control system that reduces the vehicle’s ride height and reduces the propensity to rollover. The control system applies one of three discrete suspension settings depending on the severity of the manoeuvre as well as lowering the ride height. The model is used to simulate the Fishhook 1B and the ISO 3888 Double Lane Change manoeuvres to evaluate the roll prevention system. The rollover prevention control system improved the two wheel lift off speed of the vehicle through a Fishhook 1 B manoeuvre by 64%, the body roll angle of the vehicle through the Double Lane Change manoeuvre by 13% and the body roll rate by 25.7%. The control system significantly improved the vehicle’s response with regard to smooth flat on-road untripped rollover. Further improvements are possible with the use of the proposed control system in conjunction with a fully active suspension system to allow for faster corrective action. Oorrol ongelukke is verantwoordelik vir ‘n hoe aantal van ernstige beseerings en dodelike ongelukke en dus is dit van groot belang om die hoeveelheid ongelukke te verminder. Alhoewel meeste oorrol ongelukke is as gevolg van faktore anders as die voortuig se ontwerp, soos byvoorbeeld omgewingshindernisse, is daar ‘n groot percentasie van oorrol ongelukke wat vermybaar is. On-pad onbelemmerde rollovers is direk verwant aan die voertuigontwerp. Dit is moontlik om werk in hierdie area te doen om voertuigverwante veiligheidsfaktore te verbeter. Tydens rolloverwerking tree laterale versnelling op die swaartepunt van die voertuig oor en draai dit om die buitenste wiele. Dus die metodiek in hierdie studie om oorrol te verminder of te verhoed, stem uit vermindering van die omkeer oomblik afgeneem, deur om die bewegingsarm waardeur die laterale versnelling werk, te verminder. Dit word behaal deur die rithoogte van die toetsvoertuig te verlaag deur gebruik te maak van 'n stadig aktiewe opskortingsbeheer van die toetsvoertuig (Land Rover Defender 110) wat met 'n hidro-pneumatiese suspensie stelsel toegerus is. 'N eksperimentele gevalideerde wiskundige model wat die toetsvoertuig verteenwoordig, word geskep om 'n rollover-voorkomingsbeheerstelsel te ontwikkel wat die voertuig se rithoogte verminder en die geneigdheid om oor te skakel, verminder. Die beheerstelsel pas een van drie diskrete skorsingsinstellings toe, afhangende van die erns van die maneuver asook die verlaging van die rithoogte. Die model word gebruik om die Fishhook 1B en die ISO 3888 Double Lane Change maneuvers te simuleer om die rolvoorkomingsisteem te evalueer. Die rollover-voorkomings-beheerstelsel het die twee-wiel oplig-snelheid van die voertuig verbeter deur 'n Fishhook 1 B-maneuver met 64%, die liggaamsrolhoek van die voertuig deur die Double Lane Change-maneuver met 13% en die liggaamsrolkoers met 25.7% te verbeter. Die beheersingsstelsel het die voertuig se reaksie aansienlik verbeter met betrekking tot gladde plat op-pad onbelemmerde oorrol. Verdere verbeterings is moontlik met die gebruik van die voorgestelde kontrolesisteem in samewerking met 'n ten volle aktiewe suspensie om vinniger regstellende aksie toe te laat. mi2025 Mechanical and Aeronautical Engineering MEng Unrestricted SDG-03: Good health and well-being SDG-09: Industry, innovation and infrastructure SDG-11: Sustainable cities and communities 2018-12-05T08:06:11Z 2018-12-05T08:06:11Z 2009/06/18 2018 Dissertation Wehrmeyer, VH 2018, Untripped manoeuvre induced rollover prevention for sport utility vehicles, MEng Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/67958> S2018 http://hdl.handle.net/2263/67958 en © 2018 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 | Unrestricted UCTD Untripped manoeuvre Untripped rollover sport utility vehicles (SUVs) Rollover prevention Engineering, built environment and information technology theses SDG-03 SDG-03: Good health and well-being 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 Untripped manoeuvre induced rollover prevention for sport utility vehicles |
| title | Untripped manoeuvre induced rollover prevention for sport utility vehicles |
| title_full | Untripped manoeuvre induced rollover prevention for sport utility vehicles |
| title_fullStr | Untripped manoeuvre induced rollover prevention for sport utility vehicles |
| title_full_unstemmed | Untripped manoeuvre induced rollover prevention for sport utility vehicles |
| title_short | Untripped manoeuvre induced rollover prevention for sport utility vehicles |
| title_sort | untripped manoeuvre induced rollover prevention for sport utility vehicles |
| topic | Unrestricted UCTD Untripped manoeuvre Untripped rollover sport utility vehicles (SUVs) Rollover prevention Engineering, built environment and information technology theses SDG-03 SDG-03: Good health and well-being 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 |
| url | http://hdl.handle.net/2263/67958 |