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Investigation of data from disc brakes generating noise using laser holography

Fieldhouse, John D. and Talbot, Chris J. (2002) Investigation of data from disc brakes generating noise using laser holography. In: FISITA 2002 World Automotive Congress, 2nd-7th June 2002, Helsinki.

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Abstract

Considerable knowledge of the mode of vibration of the disc, pads and other components of real disc brake systems generating noise has been obtained using the technique of double pulsed laser holography. The technique has been developed further by using electronic triggering devices which enable a series of time related holographic images to be obtained, corresponding to different times in the cycle of vibration of the braking system.
By digitising the holographic images it has been possible, using image processing techniques, to develop algorithms that determine the co-ordinates of the hologram fringe lines on the exposed portions of the disc and pad surfaces. From this information three-dimensional representations of the vibrating disc and finger pad surfaces can be constructed. Furthermore, from the series of time related images, a three dimensional animation of the real motion of the disc and pad surfaces can be obtained.
Using least-squares mathematical approximations it is also possible to generate accurate Fourier Series type representations of the vibrating disc and pad surfaces, showing both in-plane and out-of-plane motion. Holograms of the disc rim show how the vibrating motion varies throughout the thickness of the disc. It is believed that this investigation will be important in developing mathematical models of disc brake squeal.

Item Type: Conference or Workshop Item (Paper)
Subjects: T Technology > TJ Mechanical engineering and machinery
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: Cherry Edmunds
Date Deposited: 22 Oct 2008 16:52
Last Modified: 10 Dec 2010 12:18
URI: http://eprints.hud.ac.uk/id/eprint/2443

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