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Analysis of a four state switchable hydro-pneumatic spring and damper system
Dissertation (MEng (Mechanical Engineering))--University of Pretoria, 2007.
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University of Pretoria
2013
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| _version_ | 1867613655545151488 |
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| access_status_str | Open Access |
| author2 | Van Niekerk, J.L. |
| author_browse | Van Niekerk, J.L. |
| author_facet | Van Niekerk, J.L. |
| collection | Thesis |
| dc_rights_str_mv | © 2000, 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 (Mechanical Engineering))--University of Pretoria, 2007. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/24827 |
| institution | University of Pretoria (South Africa) |
| last_indexed | 2026-06-10T12:39:35.842Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2013 |
| publishDateRange | 2013 |
| publishDateSort | 2013 |
| 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:2263/24827 Analysis of a four state switchable hydro-pneumatic spring and damper system Van Niekerk, J.L. chrislg@mweb.co.za Giliomee, Christiaan Lambert No key words available UCTD Dissertation (MEng (Mechanical Engineering))--University of Pretoria, 2007. Spring and damper characteristics determine to a large extent the ride quality and handling of a vehicle. Since the requirements for good ride and good handling are conflicting, adjustable suspension elements are developed. In this study a two-state semi-active hydro-pneumatic spring, in conjunction with a two-state semi-active hydraulic damper is investigated. A mathematical model of the spring/damper system is developed and verified with measured data. Two types of tests were performed on a prototype spring/damper unit, namely characterisation tests and single degree of freedom tests. The characterisation tests included characterising the hydro-pneumatic spring, the hydraulic damper, as well as the hydraulic valves in terms of valve response times. For the single degree of freedom tests, the step response, random input response and sine sweep response were determined. Simulation models of the characterisation setup, as well as the single degree of freedom setup were constructed in Matlab Simulink. A real gas, thermal time constant model was used for modelling the hydro-pneumatic spring, while a look-up table was used for the damper characteristics. A hydraulic flow model was developed from first principles and first order valve dynamics were also included in the models. Good correlation was obtained between measured and simulated data for the characteristation tests, as well as the single degree of freedom tests. The spring/damper model can be incorporated into a full 3D vehicle model in order to predict the ride and handling of a vehicle fitted with such a system. Mechanical and Aeronautical Engineering unrestricted 2013-09-06T18:31:24Z 2006-01-24 2013-09-06T18:31:24Z 2000-00-00 2007-01-24 2006-01-24 Dissertation Giliomee, C 2000, Analysis of a four state switchable hydro-pneumatic spring and damper system, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://hdl.handle.net/2263/24827 > http://hdl.handle.net/2263/24827 http://upetd.up.ac.za/thesis/available/etd-01242006-111737/ © 2000, 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 application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf application/pdf University of Pretoria |
| spellingShingle | No key words available UCTD Analysis of a four state switchable hydro-pneumatic spring and damper system |
| title | Analysis of a four state switchable hydro-pneumatic spring and damper system |
| title_full | Analysis of a four state switchable hydro-pneumatic spring and damper system |
| title_fullStr | Analysis of a four state switchable hydro-pneumatic spring and damper system |
| title_full_unstemmed | Analysis of a four state switchable hydro-pneumatic spring and damper system |
| title_short | Analysis of a four state switchable hydro-pneumatic spring and damper system |
| title_sort | analysis of a four state switchable hydro pneumatic spring and damper system |
| topic | No key words available UCTD |
| url | http://hdl.handle.net/2263/24827 http://upetd.up.ac.za/thesis/available/etd-01242006-111737/ |