Heavy Vehicle Suspensions - Testing and Analysis: Phase 3 - eigenfrequency peak loads. Test Plan
“Road-friendly” heavy vehicle (HV) suspensions are critically dependant on correct shock absorber function. In-service testing for “road-friendliness would advantage the transport industry and road asset owners. The former because worn dampers could be replaced before vehicle and payload damage occurs; high-mileage but still serviceable shock absorbers need not be replaced (saving labour and equipment costs). The latter through reductions in road and bridge asset rehabilitation costs through less wear-and tear from HVs with out-of-specification or deficient shock absorbers.
HV tyre wear is used widely as an indicator that suspension dampers are worn. Blanksby et al., (2006) showed that this is not a good determinant of damper wear.
Under the joint QUT/MR project Heavy vehicle suspensions – testing and analysis it is proposed to develop a low-cost shaker bed made from a modified roller-brake tester to impart a known vibration to the axle. Accordingly, a heavy vehicle brake-test roller machine will be instrumented and modified. It will be used to provide a sinusoidal loading into a HV suspension using eccentricity of the roller/s. This will be attempted for wheel loads varying from tare to full load and for shock absorber conditions from fully-functional to inoperative. Resonant peak force magnitudes should be able to be analysed for axle-hop and body-bounce.
The results from this test programme will:
• be used to determine the threshold beyond which HV suspensions cause tyre wear and road damage compared with when they are new;
• augment the already-underway Main Roads programme being conduced to determine differences due to the "Haire suspension system" (Davis, 2006, 2007; Davis & Kel, 2007; Davis & Queensland Department of Main Roads, 2006a, 2006b) under the test conditions; and
• yield a "proof-of-concept" of moderate-cost testing machine to perform low-cost HV suspension testing.
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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:||12 Feb 2008|
|Last Modified:||09 Jun 2010 22:55|
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