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Thermal Brake Judder Investigations Using a High Speed Dynamometer

Bryant, David, Fieldhouse, John D., Crampton, Andrew, Talbot, Chris J. and Layfield, Jonathan (2008) Thermal Brake Judder Investigations Using a High Speed Dynamometer. In: Brake Technology, 2008. SAE. ISBN 978-0-7680-2030-4

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    Abstract

    This paper is concerned with addressing the problems experienced with the thermo-elastic behaviour of the disc - that of optimum heat dissipation, and equally important, even heating of the disc blade. The primary objective is to develop a more temperature-stable brake disc.
    The work presented approaches the problems of thermal judder through benchmarking the current situation. This is approached by modelling the current brake and its validation by means of vehicle and laboratory testing. The empirical work is centred on a bespoke high speed brake dynamometer which incorporates the full vehicle suspension for an accurate yet controlled simulation of brake and vehicle operating conditions. The dynamometer is housed in a purpose built laboratory with both CCTV and direct visual access. It is capable of dynamic measurement of DTV, caliper pressure fluctuations, disc surface temperature and vibration measurements at discrete points about the rig. This information is presented and supported by thermal imaging of the brake during a heavy brake application and subsequent thermal judder. The results also include surface scanning of the disc which is carried out at appropriate stages during testing to identify disc deformation including disc warping, “ripple” and the effects of “hot spotting”.
    Disc run-out measurements via non-contacting displacement transducers show the disc taking up varying orders of deformation ranging from first to third order during high speed testing. The state of cold deformation of the disc is also shown to vary with the disc returning to first or second order deformation upon cooling.
    Thermal images of the brake disc have shown vane patterns to show through to the disc surface identifying uneven heat distribution.

    Item Type: Book Chapter
    Additional Information: SAE Paper 2008-01-0818 presented at SAE World Congress & Exhibition 2008, Detroit, USA © 2008 SAE International. This paper is posted in this repository with permission from SAE International. As a user of this site, you are permitted to view this paper on-line, and print one copy of this paper at no cost for your use only. The printout of this SAE paper may not be copied, distributed or forwarded to others or for the use of others.
    Subjects: T Technology > TJ Mechanical engineering and machinery
    T Technology > TL Motor vehicles. Aeronautics. Astronautics
    Schools: School of Computing and Engineering
    School of Computing and Engineering > Automotive Engineering Research Group
    School of Computing and Engineering > Pedagogical Research Group
    School of Computing and Engineering > Diagnostic Engineering Research Centre
    School of Computing and Engineering > Diagnostic Engineering Research Centre > Measurement System and Signal Processing Research Group
    School of Computing and Engineering > High Performance Computing Research Group
    School of Computing and Engineering > Informatics Research Group
    School of Computing and Engineering > Informatics Research Group > Knowledge Engineering and Intelligent Interfaces
    School of Computing and Engineering > Informatics Research Group > Software Engineering Research Group
    School of Computing and Engineering > Informatics Research Group > XML, Database and Information Retrieval Research Group
    Related URLs:
    Depositing User: David Bryant
    Date Deposited: 27 Apr 2009 13:10
    Last Modified: 15 Dec 2010 12:57
    URI: http://eprints.hud.ac.uk/id/eprint/3878

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