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Mode Shape of a Squealing Drum Brake
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English
Abstract
In this paper, the measured mode shape of a squealing drum brake is presented. The squealing noise is the result of a self-excited vibration that can occur on most types of brakes. In the literature, there are several suggestions for the mechanisms behind the squeal instabilities. Therefore, there is a need for measurements to verify the models. The vibration signals are measured with accelerometers mounted on a drum brake of a heavy duty vehicle. The mode shape is measured in operation, i.e. while the vehicle is running on a test ground.
The result from the measurements is the mode shape of a squealing drum brake. The radial and tangential vibration of the drum and the shoes are measured and the accelerometers are distributed both axially and tangentially. The measured shape is a complex mode containing a wave. This wave moves in the same direction as the rotation of the drum.
As the drum rotates during the measurement, a Doppler effect influences the measured frequency. Therefore, a method for transforming the drum signal to obtain a correct transfer function has been developed.
The measurements give a very good verification tool for analytical models as well as a better understanding of the characteristics of squealing drum brakes.
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Citation
Hultén, J., Flint, J., and Nellemose, T., "Mode Shape of a Squealing Drum Brake," SAE Technical Paper 972028, 1997, https://doi.org/10.4271/972028.Also In
References
- Hultén, J. “Friction Models Applied on Drum Brake Squeal” Conference on Mechanical Vibration and Noise, at the 1997 ASME Design Engineering Conferences and Computers in Engineering Conference Sacramento, California Sept 1997
- Sinclair, D. “Frictional Vibrations” Journal of Applied Mechanics 22 207 214 June 1955
- Basford, P.R. Twiss, S.B. “Properties of Friction Materials. I - Experiments on Variables Affecting Noise” Transactions of the ASME 80 402 406 Feb. 1958
- Basford, P.R. Twiss, S.B. “Properties of Friction Materials. II - Theory of Vibrations in Brakes” Transactions of the ASME 80 407 410 Feb. 1958
- Spun, R.T. “A Theory of Brake Squeal” I.Mech.E., Proceedings of the Automobile Division 1 33 40 41 45 45 50 51 52 1961 1962
- Jarvis, R.P Mills, B. “Vibrations Induced by Dry Friction” I.Mech.E., Proceedings 178 1 847 857 857 864 864 866 1963 1964
- Wagenführer, H. “BremsgerÁusche” A. T.Z. 66 217 222 Aug. 1964
- Goady, R.K. “Sources of Brake Squeal in Motor Vehicles” International Symposium on Transportation Noise Pretoria, South Africa Oct. 1981
- Earles, S.W.E. Chambers, P.W. “Disc Brake Squeal - Some Factors Which Influence on Its Occurence” Disc Brakes for Commercial Vehicles London, England 40 46 I.Mech.E. paper C454/88 Nov. 1988
- Lee, A.C. “Study on Disc Brake Noise Using Multibody Mechanism With Friction Interface” Friction-Induced Vibration, Chatter; Squeal and Chaos Ibrahim, R.A. Soom, A. DE-49 99 105 Anaheim, California ASME Winter Annual Meeting Nov. 1992
- Millner, N. A Study of the Squeal of Drum Brakes University of Leeds Leeds, England 1976
- Okamura, H. Nishiwaki, M. “A Study on Brake Noise - Drum Brake Squeal” JSME International Journal Series III 32 206 214 June 1989
- North, M.R. “Disc Brake Squeal” Braking of Road Vehicles Loughborough, England 169 176 365 366 I.Mech.E. paper C38/76 Mar. 1976
- Mottershead, J.E. Chan, S.N. “Brake Squeal - An Analysis of Symmetry and Flutter Instability” Friction-Induced Vibration, Chatter Squeal and Chaos Ibrahim, R.A. Soom, A. DE-49 87 97 Anaheim, California ASME Winter Annual Meeting Nov. 1992
- Brooks, P.C. Crolla, D.A. Lang, A.M. Schafer, D.R. “Eigenvalue Sensitivity Analysis Applied to Disc Brake Squeal” Braking of Road Vehicles London, England 135 143 I.Mech.E. paper C444/004/93 Mar. 1993
- Hultén, J. “Some Drum Brake Squeal Mechanisms” Proceedings of the 1995 Noise and Vibration Conference 1 Traverse City, Michigan 377 388 SAE paper 95 12 80 May 1995
- Lang, A.M. An Investigation into Heavy Vehicle Drum Brake Squeal Loughborough University of Technology Loughborough, England May 1994
- Chen, S. Guan, D. “Theoretical and Experimental Study on Drum Brake Squeal” Sixth International Pacific Conference and Exposition on Automotive Engineering Seoul, Korea 371 375 SAE paper 91 24 97 Nov. 1991
- Kim, S.Y Drum Brake Noise and Vibration Analysis University of Bradford Bradford, England Aug. 1993
- Lang, A.M. Newcomb, T.P. “The Vibration Characteristics of Squealing Brakes” Fisita Congress Turin, Italy SAE paper 90 51 70 1990
- Crolla, D.A. Lang, A.M. “Brake Noise and Vibration - The State of the Art” Vehicle Tribilogy Dowson, D. Taylor, C.M. Godet, M. 18 Leeds, England 165 174 Sept 1991
- Lang, A.M. Schafer, D.R. Newcomb, T.P. Brooks, P.C. “Brake Squeal - The Influence of Rotor Geometry” Braking of Road Vehicles London, England 161 171 I.Mech.E. paper C444/016/93 Mar. 1993
- Kusano, M. Ishidou, H. Matsumura, S. Washizu, S. “Experimental Study on the Reduction of Drum Brake Noise” West Coast International Meeting and Exposition SAE paper 85 14 65 1985
- Suzuki, Y. Ohno, H. “A Study on Drum Brake Noise of Heavy Duty Vehicles” SAE paper 81 13 99 Oct. 1981
- Døssing, O. “Structural Stroboscopy - Measurement of Operational Deflection Shapes” Technical Review Brüel & Kjær Nærum, Denmark 1994
- Anderson, R.A. Fundamentals of Vibrations New York MacMillan Company 1967
- Råde, L. Westergren, B. Beta - Mathematics Handbook Lund, Sweden Studentlitteratur 1988