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A study of brake noise and the influence of the centre of pressure at the disc/pad interface, the coefficient of friction and calliper mounting geometry

Fieldhouse, John D. and Steel, W.P (2003) A study of brake noise and the influence of the centre of pressure at the disc/pad interface, the coefficient of friction and calliper mounting geometry. Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering, 217 (D11). pp. 957-973. ISSN 0954-4070

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    Abstract

    It is generally accepted that the coefficient of friction between the friction pair, the pad and the rotor plays a significant role in the propensity of a brake to generate noise. Because of the ease with which changes may be made to the pad compound material it is this that is more often the subject of change when there is a problematic noisy brake with both the rotor and the calliper tending to remain 'isolated' from examination. This paper investigates the propensity of a brake to generate noise over a range of temperatures and pressures under conditions that allow a mechanically induced offset centre of pressure between the pad and rotor to be varied. It is shown that for a high-volume production car brake there is an increased tendency for it to generate noise when a very specific leading offset centre of pressure is engineered. With this condition it is shown that a situation is promoted whereby the brake becomes mechanically unstable, with system changes such as brake pressure and temperature variations having little influence on the brake to alter its tendency to generate noise. Furthermore, it is shown that the critical offset centre of pressure may be related to the coefficient of friction between the friction pair and the mounting geometry of the calliper. Confirmation of the findings are supported by a repeat investigation of the vehicle's alternative brake calliper. It is suggested that the source of a noisy brake may lie as much in basic mechanical design as inappropriate material choice.

    Further confirmation is demonstrated through the study of a commercial sliding fist-type brake, where the brake is significantly noisier when the centre of pressure and calliper mounting arrangement provide an appropriate spragging angle related to the friction coefficient.

    Item Type: Article
    Additional Information: UoA 25 (General Engineering) D06503© IMechE 2003
    Subjects: 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 > High Performance Computing Research Group
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    References:

    Fieldhouse, J. D. and Newcomb, T. P. The techniques of double pulsed holographic interferometry applied to the problems of noisy disc brakes. In International Conference on Vibration and Noise (Vibration and Noise '95), Venice, Italy, April 1995, pp. 453-457.

    Spurr, R. T. Brake squeal. In IMechE Symposium on Vibration and Noise in Motor Vehicles, 1971, paper C95/71, pp. 13-16.

    Fieldhouse, J. D. and Newcomb, T. P. The application of holographic interferometry to the study of disc brake noise. In SAE International Congress and Exposition, Detroit, 1-5 March 1993, paper 930805.

    Fieldhouse, J. D. An analysis of disc brake noise using holographic interferometry. PhD thesis, University of Huddersfield, 1993.

    Fieldhouse, J. D. A proposal to predict the noise frequency of a disc brake based on the friction pair interface geometry. In 17th Annual SAE Brake Colloquium and Engineering Display, Florida, 10-13 October 1999, SAE paper 1999-01-3403.
    Fieldhouse, J. D. and Newcomb, T. P. An experimentalinvestigation into disc brake noise. In IMechE International Conference on The Braking of Road Vehicles, London, March 1993, paper C444-036, pp. 145-159.

    Depositing User: Briony Heyhoe
    Date Deposited: 19 Jul 2007
    Last Modified: 10 Dec 2010 12:06
    URI: http://eprints.hud.ac.uk/id/eprint/299

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