Parametric Stability Analysis of a Floating Caliper Disk Brake

Abstract

Considerable effort is spent in the design and testing of disk brakes of modern passenger cars. This effort can be reduced if refined mathematical-mechanical models are used for studying the dynamies of these brakes before prototypes are available. The present paper is dcvoted to the modeling of a floating caliper disk brake, special regard being given to squeal. A new model of a floating caliper disk brake is inteoduced in order to predict the onset of squcal with freqiemcy of noise ranging between 1 to 5 kHz. The model includes the brake rotor, housing, piston and pads. In this nonlinest model all the prominent features of squeal are reproduced, such as independence of the frequency on the speed, etc. The instability appears even with a constant coefficient of friction between the disk and the pads. Limit cycles are obtained in presence of nonlinearity of the pad stiffness.