Abstract
This paper deals with the analytical reproduction of the squeal phenomena generated in a certain type of bicycle disc brake unit. It was made clear that the squeal was in-plane vibration in the direction of a disc surface with frequency about 1000Hz caused by frictional characteristics with negative slope with respect to the relative velocity according to the numerical analysis of the both in-plane and out-of-plane vibrations, and was generated in the vibration system including the brake unit and spokes. The analytical model of the bicycle disc brake system was set up. The resulting frequency of the squeal and the unstable vibration modes of spokes and rotor agreed well with the experimental ones.
