Analysis of vibration and squeal noise of a brake rotor using a simplified model

The study proposes a simplified brake rotor system model with an attempt to deepen the understanding on the generation of brake vibration and the high-frequency sequel noise.;The proposed brake rotor model is a combination of an annular plate and a cylindrical shell segment connected together by distributed artificial springs. Based on a three-dimensional elasticity theory, a numerical procedure is established using variational principle and Rayleigh-Ritz method. Modal analyses show the existence of three types of modes, classified as plate-dominant-modes, shell-dominant-modes and strongly-coupled- modes.;The dynamic interaction between the brake rotor and the pad is investigated based on a parametric excited vibration system. Time domain responses of the system are simulated through Green's function. The effects of various parameters on the response feature are thoroughly investigated through comparative studies among various excitation configurations. A comprehensive stability analysis is performed using Valeev's method. It is shown that instability occurs when the rotation speed and the natural frequencies of the system satisfy a certain condition.;The sound radiation of the previously developed model is studied. The time history of the sound power of the parametric excited vibration system is worked out. The effect of the radiation damping incurred by the structure/fluid interaction is taken into account in the analysis.