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Rotor asymmetry used to reduce disc brake noise

Fieldhouse, John D., Steel, William P., Talbot, Chris J. and Siddiqui, Mustakeem A. (2004) Rotor asymmetry used to reduce disc brake noise. SAE Technical Papers. ISSN 0148-7191

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Abstract

Asymmetry is applied to a heavy-duty commercial twin caliper disc brake rotor as a means to alleviate an undesirable high amplitude noise. The problematic frequency is 2400 Hz, the rotor blade exhibiting a 5- diametric mode order of vibration. The asymmetry is introduced by drilling sets of radial holes into the disc rim. Modal analysis is carried out over a range of frequencies using added masses applied magnetically to the rim of the rotor. This shows the amplitudes at set frequencies to reduce considerably when asymmetry is introduced. When a set of 5 masses is added to the rotor the vibration amplitude at the troublesome frequency is seen to be considerably reduced. Finite element analysis complements the experimental results. The analysis of a plain disc initially shows the two normal modes at very close frequencies but when asymmetry is introduced, by drilling holes in the rim of the disc, there is a noticeable frequency decoupling of the 2 normal modes. This is also accompanied by a distinct positioning of the antinodes with the antinodes of one mode positioning at the sets of drilled holes, the other mode antinodes being between the holes. When an asymmetric disc is fitted to the vehicle the noise is eradicated. Significant testing of the vehicle has since been undertaken without noise being generated

Item Type: Article
Additional Information: Paper presented at 22nd Annual Brake Colloquium & Exhibition, October 2004, Anaheim, CA, USA
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TA Engineering (General). Civil engineering (General)
Schools: School of Computing and Engineering
School of Computing and Engineering > Automotive Engineering 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 > Pedagogical Research Group
School of Computing and Engineering > High Performance Computing Research Group
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Depositing User: Briony Heyhoe
Date Deposited: 22 Jul 2008 11:30
Last Modified: 10 Dec 2010 12:00
URI: http://eprints.hud.ac.uk/id/eprint/1162

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