Title: Experimental observations of coupled-mode instability in disc brake systems leading to squeal vibration

Authors: David N. VanderLugt, Charles M. Krousgrill, Farshid Sadeghi

Addresses: Purdue University, 585 Purdue Mall, West Lafayette, IN 47907, USA. ' School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette, IN 47907, USA. ' Mechanical Engineering Tribology Laboratory (METL), School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette, IN 47907, USA

Abstract: A brake system test rig was used to simulate braking operation and measure acoustic pressure, disc temperature and brake pressure during squeal events. Experimental results presented are the strong dependence of squeal frequency content on engagement pressure, the broadening of required brake pressure range for squeal existence as temperature increases, and a periodic squeal behaviour. A model was developed to analyse the stability for squeal prediction. This model is a reduced order modal model, based on component finite element modal properties. Additional support for the coupled mode instability is the correlation of experimental squeal frequencies with analysis.

Keywords: squeals; vehicle noise; friction; flutter; eigenvalue analysis; stability; disc brake systems; squeal vibration; coupled-mode instability; simulation; vehicle vibration; acoustic pressure; disc temperature; brake pressure; squeal prediction.

DOI: 10.1504/IJVNV.2006.011970

International Journal of Vehicle Noise and Vibration, 2006 Vol.2 No.3, pp.266 - 281

Published online: 06 Jan 2007 *

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