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Investigation of brake squeal and the influence of the abutment faces.

Fieldhouse, John D., Bryant, David and Talbot, Chris J. (2010) Investigation of brake squeal and the influence of the abutment faces. In: Proceedings of 6th European Conference on Braking, JEF 2010. European Conference on Braking . Groupement Regional Nord/Pas-de-Calais pour la Recherche dans les Transports, Universite de Lille 1, France, pp. 255-262.

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    Abstract

    This paper demonstrates the influence of the trailing end of the piston, or inboard, pad on the propensity of a brake to generate audible squeal. The unique technique was employed to measure the dynamic centre of pressure at the pad/disc interface during a normal braking operation. This novel technique uses an embedded pressure sensitive film within the pad. The paper also presents the co-planar analysis of the pad/caliper contact regions and its influence on the position of the disk/pad “Centre of Pressure” (CoP). The analysis shows how the trailing end of the piston pad influences the position of the CoP and goes on to explain why the centre moves as the pad abutment vibrates against the abutment. The paper includes additional work with a 12 piston opposed caliper where the initial CoP may be varied both along the pad and radially. Results show a very definite movement of the centre of pressure as the brake pressure is increased.

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    Item Type: Book Chapter
    Additional Information: Funders are sponsors of the conference.
    Uncontrolled Keywords: Pad abutment, Centre of Pressure, Spragging
    Subjects: T Technology > TA Engineering (General). Civil engineering (General)
    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
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    References:

    [1]. Fieldhouse J.D. and Newcomb T.P. “The Techniques of Double Pulsed Holographic Interferometry Applied to the Problems of Noisy Disc brakes” - Vibration and Noise ‘95 pp 453-457. An international conference on vibration and noise. April 1995, Venice, Italy.
    [2]. Jarvis, R.T. and Mills, B. "Vibrations induced by dry friction." Proceedings of I.Mech.E. 1963-64. Vol. 178 pt 1 No.32, pp 846 – 866
    [3]. Earles, S.W.E. SAE "A mechanism of disc brake squeal." Paper No. 770181, Detroit, 1977.
    [4]. Earles, S.W.E. and Badi, M.N.M."On the interaction of a Two-Pin-Disc System with reference to disc Brake Squeal" SAE Paper No.780331, Detroit 1978.
    [5]. Earles, S.W.E. and Chambers, P.W. "Disc brake squeal noise generation: predicting its dependency on system parameters including damping." International Journal of vehicle Design, vol. 8, nos 4/5/6, pp 538 - 552, 1987.
    [6]. Spurr, R.T.Paper “Brake squeal." No. C95/71, Symposium on Vibration and Noise in Motor Vehicles, I.Mech.E. 1971, pp 13 – 16
    [7]. Liles, G. "An analysis of disc brake squeal using finite element methods." SAE Paper No. 891150, 1989.
    [8]. Fieldhouse JD “A Study of the Interface Pressure Distribution Between Pad and Rotor, the Coefficient of Friction and Caliper Mounting Geometry with Regard to Brake Noise" Brakes 2000 International Conference on Automotive Braking. July 2000 ISBN: 1-86058-261-3, pp 3-18 Pub. MEP.

    Depositing User: John Fieldhouse
    Date Deposited: 07 Dec 2010 10:23
    Last Modified: 15 Dec 2010 12:35
    URI: http://eprints.hud.ac.uk/id/eprint/9179

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