Abstract
Squeal is caused by a type of frictional self-excited vibration and can be quite unpleasant for drivers, passengers, and even nearby pedestrians. In-plane squeal is classified as a high-frequency squeal, but its characteristics are different from those of general, high-frequency, out-of-plane squeals. While in-plane squeal has been examined in a number of studies, the vibration generation mechanisms for in-plane squeal have yet to be clarified. The present paper deals with disc brake generated in-plane squeal. The vibration modes of a brake unit during squealing are investigated and the relationship between the rate of occurrence of squeal. The effect of brake pad thickness on squeal and rib slitting of the disc are also investigated, as are the frictional characteristics of disc brakes. The present paper also deals analytically with in-plane squeal using a concentrated mass model formed by the connection of massless beams, and the characteristics of in-plane squeal are investigated.
KEYWORDS – Self-excited vibration, Squeal, Disc brake, Dry friction, Coulomb friction