Comparison of different gas models to calculate the spring force of a hydropneumatic suspension

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dc.contributor.author Van der Westhuizen, Sarel Francois
dc.contributor.author Els, P.S. (Pieter Schalk)
dc.date.accessioned 2016-03-15T07:52:58Z
dc.date.available 2016-03-15T07:52:58Z
dc.date.issued 2015-02
dc.description.abstract When developing any simulation model some compromise must be made between computational efficiency and the accuracy of the model. This study compares the performance of three ideal gas (IG) law variations (IG with the energy equation (EE), isothermal and adiabatic), and two real gas approaches (Benedict Webb Rubin (BWR) equation with and without the EE) to model the spring force of a hydropneumatic suspension. These models are compared with experimental data obtained from laboratory tests on a single hydropneumatic suspension unit. Both the BWR and IG models with the EE offer a significant improvement in correlation compared to the models without the EE. The real gas BWR approach offers a small improvement over the IG approach under the test conditions. The best (BWR with EE) and worst (IG isothermal) models are then used to model the spring forces in a full vehicle model of a 4 × 4 Sports Utility vehicle (SUV). The data is again compared with experimental results and the BWR model with the EE correlates significantly better than the IG isothermal model. It is thus concluded that the inclusion of the EE will yield significantly better results and it should only be omitted if the parameters investigated are not sensitive to errors in the spring model. en_ZA
dc.description.librarian hb2015 en_ZA
dc.description.uri http://www.elsevier.com/locate/jterra en_ZA
dc.identifier.citation Van Der Westhuizen, SF & Schalk Els, P 2015, 'Comparison of different gas models to calculate the spring force of a hydropneumatic suspension', Journal of Terramechanics, vol. 57, pp. 41-59. en_ZA
dc.identifier.issn 0022-4898 (print)
dc.identifier.issn 1879-1204 (online)
dc.identifier.other 10.1016/j.jterra.2014.11.002
dc.identifier.uri http://hdl.handle.net/2263/51830
dc.language.iso en en_ZA
dc.publisher Elsevier en_ZA
dc.rights © 2014 ISTVS. Published by Elsevier Ltd. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Journal of Terramechanics. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Terramechanics, vol. 57, pp. 41-59, 2015. doi : 10.1016/j.jterra.2014.11.002. en_ZA
dc.subject Vehicle simulation en_ZA
dc.subject Hydropneumatic suspension en_ZA
dc.subject Suspension modelling en_ZA
dc.subject Spring modelling en_ZA
dc.subject Gas modelling en_ZA
dc.subject Model verification en_ZA
dc.subject Real gas en_ZA
dc.subject Ideal gas (IG) en_ZA
dc.subject Energy equation (EE) en_ZA
dc.subject Benedict Webb Rubin (BWR) en_ZA
dc.title Comparison of different gas models to calculate the spring force of a hydropneumatic suspension en_ZA
dc.type Postprint Article en_ZA


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