In-service testing of heavy vehicle suspensions – background report for the NTC project
Some road authorities are required, by agreement with the Australian Government, to develop an in-service HV suspension test (Australia Department of Transport and Regional Services, 2005a, 2005b). Development and implementation of such in-service HV suspension testing procedures, who would perform them and field test equipment will be the outcomes of a project currently underway and managed by the National Transport Commission (NTC). This report is a background briefing on suspension testing techniques for the NTC project. The "science" of pavement and bridge behaviour is not exact. Even so, models are used to estimate heavy vehicle (HV) wheel-force damage to the road network asset. Likewise, the "science" of HV suspension performance is not exact. These shortcomings did not stop "road-friendly" air-suspended HVs being allowed greater mass as a concession in Australia and Europe. This move, whilst questionable with the clarity of hindsight, now needs to be managed in the light of better understanding of the dynamics of HV air suspensions. This management approach needs to consider that the test regime for new HV suspensions in Australia could benefit from revision, dating as it does from before HV air suspension behaviour was better understood. The role of suspension dampers (shock absorbers) is critical to the continuing health of HV air suspensions. Over 50% of air suspensions on HVs on the road do not meet the Australian requirement for "road-friendliness". An in-service test is to be developed for air-suspended HVs, as agreed between two Australian States and the Commonwealth, to ensure HV damper health. By applying this, or other mechanisms, to ensure continued HV suspension health, the saving to Queensland Main Roads alone in terms of reduced maintenance costs will be greater than $59M/annum (in 2007 $). This quantum does not include the road safety or workplace health & safety impacts of out-of-specification HV suspensions. Neither does it include Local Government impacts.
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|Keywords:||heavy vehicles, HVs, air suspensions, air lines, road friendly suspensions, RFS, suspension testing, load sharing, suspension dynamics, dynamic forces|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300) > Mechanical Engineering not elsewhere classified (091399)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > AUTOMOTIVE ENGINEERING (090200) > Automotive Engineering not elsewhere classified (090299)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > INTERDISCIPLINARY ENGINEERING (091500) > Interdisciplinary Engineering not elsewhere classified (091599)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > OTHER ENGINEERING (099900) > Engineering Instrumentation (099902)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Civil Engineering not elsewhere classified (090599)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > CIVIL ENGINEERING (090500) > Transport Engineering (090507)
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering|
|Copyright Owner:||Copyright 2008 The State of Queensland (Department of Main Roads) and the Queensland University of Technology|
|Copyright Statement:||Reproduction of this publication by any means except for purposes permitted under the Copyright Act is prohibited without the prior written permission of the Copyright owners.
This publication has been created for the purposes of road transport research, development, design, operations and maintenance by or on behalf of the State of Queensland (Department of Main Roads) and the Queensland University of Technology. The State of Queensland (Department of Main Roads) and the Queensland University of Technology give no warranties regarding the completeness, accuracy or adequacy of anything contained in or omitted from this publication and accept no responsibility or liability on any basis whatsoever for anything contained in or omitted from this publication or for any consequences arising from the use or misuse of this publication or any parts of it.
The authors have exerted their moral rights.
|Deposited On:||25 Jan 2008 00:00|
|Last Modified:||09 Jun 2010 12:55|
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