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An Investigation of Low Frequency Drum Brake Noise
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English
Abstract
A test rig which replicates a one quarter vehicle of a rear wheel drive vehicle, including the suspension system, is used to investigate a low frequency noise. The cross beam is included along with the vehicle suspension spring which is loaded against a sprung loaded mechanism which represents the tyre stiffness exactly and supports the brake geometrically as the tyre would. Drive to the drum is from a DC motor through the wheel drive axle.
Holographic Interferometry is used to observe the modes of vibration of the drum with mirrors strategically placed to observe additional features such as the backplate, spring pan and cross beam.
Initial results show the mode of vibration of the backplate to be of a diametral mode order and to be moving in the direction of drum rotation. Additionally it is seen that the spring pan and cross beam exhibit high amplitudes of vibration.
Additional tests are then undertaken with the suspension members omitted and the brake arranged to allow visual access to the brake shoes.
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Authors
Citation
Fieldhouse, J. and Rennison, M., "An Investigation of Low Frequency Drum Brake Noise," SAE Technical Paper 982250, 1998, https://doi.org/10.4271/982250.Also In
References
- Fieldhouse J.D. The University of Huddersfield 1993
- Fieldhouse J.D. Newcomb, T.P. “Holographic and Analytical Techniques Applied to Drum Brake Squeal” EAEC 5th International Congress “The Automotive Industry meets the Challenges of the year 2000” 21st - 23rd June 1995 Strasbourg
- Fieldhouse J.D. Rennison M “Drum Brake Noise - A Theoretical and Visual Approach” “Advances in Automotive Braking Technology - Design Analysis and Materials Developments” 25 46 October 1996 Mechanical Engineering Publications Limited (MEP) Publishers to the IMechE 1 86058 039 4
- Fieldhouse J.D. Newcomb “Double Pulsed Holography Used to Investigate Noisy Brakes” Optics and Lasers in Engineering 25 6 “Optical Sensors for Automotive Applications” December 1996 0143-8166(95)00094-1 455 494