On the origin of disk brake squeal
by Utz Von Wagner, Stefan Schlagner
International Journal of Vehicle Design (IJVD), Vol. 51, No. 1/2, 2009

Abstract: It is commonly accepted by engineers and scientists working in the field of brake noise, that squeal in a disk brake is initiated by an instability due to the friction forces leading to self-excited vibrations. The self-excited brake system then oscillates, reaching a limit cycle. Popp et al. described in 2002 based on a very simple model the pre-conditions for positive work of the friction forces (i.e., excitation of squeal). The authors of the present paper used a multi degree of freedom system for the investigation of the origin of the excitation mechanism by observing the average power of the friction forces at the pads and comparing the result with the classic stability analysis. A measurement technique based on these theoretical investigations was developed for detecting parameter regions (e.g., for the brake pressure and corresponding squealing frequencies) which are suspicious for squeal.

Online publication date: Wed, 15-Jul-2009

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