Squeal noise generation during braking is a complicated dynamic problem which automobile manufacturers have confronted for decades. Customer complaints result in significant yearly warranty costs. More importantly, customer dissatisfaction may result in rejection of certain brands of brake systems. In order to produce quality automobiles that can compete in today's marketplace, the occurrence of disc brake squeal noise must be reduced. The addition of a constrained layer material to brake pads is commonly utilized as a means of introducing additional damping to the brake system. Additional damping is one way to reduce vibration at resonance, and hence, squeal noise. The simulation of braking events in dynamometers has typically been the preferred insulator selection process. However, this method is costly, time consuming and often does not provide an insight into the mechanism of squeal noise generation. This work demonstrates the use of modal analysis techniques to select brake dampers for reducing braking squeal. The proposed methodology reduces significantly the insulator selection time and allows an optimized use of the brake dynamometer to validate selected insulators

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Disc brake squeal noise is a complicated dynamic problem that has confronted automobile manufacturers for decades. The reduction of brake squeal noise is an important technological subject in terms of making vehicles quieter. Two main mechanisms are correlated with squeal noise in disc brake systems. The first one is related to the velocity dependency of the friction coefficient. The second one is the modal coupling of the rotor and the pads. In this case, the modes of the pads and rotor are coupled and the system may become unstable. To extract the natural frequencies and the vibration modes of pads is of great importance for the forecast of the dynamic behavior of the complete system. Thus, it can predict the behavior of the pads with the noise generated by the system. In this work, results of experimental modal analysis of the pads are presented and compared with the results obtained through use of the finite-element method (FEM). Different conditions of temperature were applied to the pads and simulated by FEM, verifying the influence of the work temperature in the natural frequencies.