Abstract
Brake squeal noise has been under investigation by the automotive manufacturers for decades due to consistent customer complaints and high warranty costs. Brake squeal is a problem that has been faced by several numerical and analytical methods in the last decade. Among then, finite-element analysis is proving to be a useful tool to predict the noise occurrence of a particular brake system during the design stage. The finite-element method (FEM) has been employed to analyze the squeal propensity of the disc brake systems. The complex eigenvalue analysis conjugated with FEM has been widely used to detect unstable frequencies in numerical brake systems models. These unstable frequencies are related, in most cases, with high sound pressure levels generated during the brake system operation. This paper summarizes the application of the complex eigenvalue analysis in a finite element model. The effects of the operating parameters (friction coefficient, braking pressure, brake temperature) and wear on the dynamic stability of the brake system are examined. After identifying unstable frequencies and the behavior under different conditions, the performance of some control methods are tested. Changes in material properties and the application of brake noise insulators are presented and its effect discussed.
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