Title: Structural modifications for squeal noise reduction: numerical and experimental validation

Authors: Francesco Massi, Laurent Baillet, Antonio Culla

Addresses: Universite de Lyon, CNRS, INSA-Lyon, LaMCoS, UMR5259, 20 rue des Sciences, F-69621, Villeurbanne, France. ' Laboratoire de Geophysique Interne et Tectonophysique, CNRS, Universite J. Fourier BP 53, Grenoble Cedex 9, 38041, France. ' Department of Mechanics and Aeronautics, University of Rome 'La Sapienza', Via Eudossiana 18, 00184 Rome, Italy

Abstract: Squeal is an example of noise caused by vibrations induced by friction forces. Several works have been developed over the last decades. Certain of these works have focused on simplified brake systems and identified |lock-in| instability as being the cause of squeal. A short bibliography of previous works and the most recent results are presented. Brake design is not capable of avoiding modal coupling due to |lock-in| sensitivity to system dynamics, high modal density and uncertainties regarding the natural frequencies. This paper suggests an innovative approach for avoiding the growth of vibrations, by making lumped structural modifications to the rotor.

Keywords: brake squeal; contact; lock-in instability; structural modification; vehicle braking; vehicle design; vibrations; vehicle noise.

DOI: 10.1504/IJVD.2009.027120

International Journal of Vehicle Design, 2009 Vol.51 No.1/2, pp.168 - 189

Published online: 15 Jul 2009 *

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