400 Commonwealth Drive, Warrendale, PA 15096-0001 U.S.A. Tel: (724) 776-4841 Fax: (724) 776-5760 Web: www.sae.org 2005-01-0929 Suspension Trade Studies for Hybrid Electric Combat Vehicles J. H. Beno, M. T. Worthington and J. R. Mock Center for Electromech anics, The University of Texas at Austin Reprinted From: Military Vehicle Technology (SP-1962) 2005 SAE World Congress Detroit, Michigan April 11-14, 2005 SAE TECHNICAL PAPER SERIESDownloaded from SAE International by Univ of California Berkeley, Sunday, July 29, 2018The Engineering Meetings Board has approved this paper for publication. It has successfully completed SAE’s peer review process under the supervision of the session organizer. This process requires a minimum of three (3) reviews by industry experts. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise,without the prior written permission of SAE. For permission and licensing requests contact: SAE Permissions 400 Commonwealth DriveWarrendale, PA 15096-0001-USAEmail: [email protected]: 724-772-4028Fax: 724-772-4891 For multiple print copies contact: SAE Customer ServiceTel: 877-606-7323 (inside USA and Canada)Tel: 724-776-4970 (outside USA)Fax: 724-776-1615Email: Customer [email protected] ISSN 0148-7191Copyright © 2005 SAE International Positions and opinions advanced in this paper are those of the author(s) and not necessarily those of SAE. The author is solely responsible for the content of the paper. A process is available by which discussions will be printed with the pap er if it is publishe d in SAE Transactions. Persons wishing to submit papers to be considered for presentation or publication by SAE should send themanuscript or a 300 word abstract to Secretary, Engineering Meetings Board, SAE. Printed in USADownloaded from SAE International by Univ of California Berkeley, Sunday, July 29, 20182005-01-0929 Suspension Trade Studies for Hybrid Electric Combat Vehicles J. H. Beno, M. T. Worthington and J. R. Mock Center for Electromechanics, The University of Texas at Austin Copyright © 2005 SAE International ABSTRACT The University of Texas at Austin Center for Electromechanics (UT-CEM) has been developing advanced suspension technology for high-speed off-road applications since 1993. During the course of the program, advanced simu lation techniques, verified by hardware demonstrations, were developed and refined. Based on this experience, UT-CEM conducted a detailed simulation-based comparison of passive, semi-active, and full-active suspension systems for an 18,000 kg (20 ton) 8 x 8 vehicle. Performance metrics are proposed to compare crew comfort, crew effectiveness, on-board equipment effectiveness, and power/energy consumption. This paper presents the methodology and rationale for metrics used in the study, simulation results, and data from this trade study. Results indicate significant advantages offered by well-designed active systems compared to both passive and semi-active, in all metrics. INTRODUCTION Strategic considerations frequently impose severe volume constraints on combat vehicle designers, usually to meet airlift requirements such as C-130 transportability. For 18,000 kg (20 ton) wheeled combat vehicles, an 8 x 8, trailing arm topology is frequently considered as being the most compact practical approach. Additionally, due to volume constraints, these vehicles typically do not employ anti-roll bars. Consequently, to reasonably limit the scope of the study, only an 8 x 8 trailing arm topology was modeled. Trailing arm suspension systems are compatible with differential torque steering (“skid steering”) or hybrid steering approaches that use limited Ackerman steering in combination with differential torque steering. Mobility goals for advanced, high-mobility hybrid electric fighting vehicles frequ