Title page for ETD etd-11262009-011206

Document Type Master's Dissertation
Author Cronje, Paul Hendrik
Email cronnies@gmail.com
URN etd-11262009-011206
Document Title Improving off-road vehicle handling using an active anti-roll bar
Degree MEng
Department Mechanical and Aeronautical Engineering
Advisor Name Title
Prof P S Els Supervisor
  • active anti-roll bar
  • off-road vehicle handling
Date 2009-09-02
Availability unrestricted
This thesis investigates the use of an active anti-roll bar as a means of improving the handling of an off-road vehicle.

The active anti-roll bar consists of a stiff anti-roll bar and a hydraulic actuator at the one end between the anti-roll bar and the rear axle of the vehicle. The system is designed so that the anti-roll bar can be preloaded in both directions by the actuator. The displacement of the hydraulic actuator is close loop controlled to be a function of the lateral acceleration of the vehicle, which is measured by an accelerometer.

For this study, full vehicle simulations were done in ADAMS/View to predict the response of the proposed solutions. A Land Rover Defender 110 was used as the test vehicle to verify the results of the simulations.

Constant radius tests and the severe double-lane-change manoeuvre, which are standard handling tests, were used to determine the vehicle’s handling performance. Handling performance was quantified by measuring the body roll angle during the manoeuvre and noting the maximum roll angle. The effect of the active anti-roll bar on ride comfort was measured by driving over Belgian paving at a constant speed.

The results show that the proposed system reduces the body roll angle to zero up to a lateral acceleration of 0.4 g during steady state handling and provided a 74% improvement in maximum body roll angle during a double-lane-change-manoeuvre at 70 km/h. The system has no detrimental effect on the ride comfort of the vehicle.

© 2008, 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.

Please cite as follows:

Cronje, PH 2008, Improving off-road vehicle handling using an active anti-roll bar, MEng dissertation, University of Pretoria, Pretoria, viewed yymmdd < http://upetd.up.ac.za/thesis/available/etd-11262009-011206/ >


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