Abstract
This paper investigates the effect of the contact area between a disc and a pad on squeals generated in automotive disk brake. The braking tests with a bench test rig composed of an actual brake unit have carried out in order to explore the effect on squeal frequency and the squeal propensity when the contact area between the disc and the pad is changed by removing a part of the sliding surface of the pad in the radial direction. Furthermore, the complex eigenvalue analysis using the proposed lumped parameter model is conducted and the obtained analytical results are compared with the experimental data. It is made clear that the effect of radial contact area between the disc and the pad on squeal depends on the squeal modes and the contact stiffness between the disc and the pad.
KEYWORDS – Frictional Vibration, Self - Excited Vibration, Stability, Squeal, Disc Brake