Suppression of Brake Squeal Noise Applying Viscoelastic Damping Insulator

Squeal noise in vehicle disc brakes is perceived by consumers as both annoying and warranty cost. Among the methods that have been used to control squeal noise, increasing the system damping has been shown to be very effective. The most commonly used method to increase system damping consists of attaching multi-layer laminates on the back of the brake pads. As brake squeal is a friction induced instability phenomenon that has to be addressed during the development process, the mechanism is considered to be a mode coupling phenomenon also referred to as coalescence. In this paper, the dynamics of a disc brake system are discussed. The system eigenvalues have been computed using a technique based on the analytical model. The effects of damping on the coalescence patterns have been investigated. The result shows that damping is a key parameter which requires highly detailed analysis when modeling the occurrence of instabilities.