Experimental and theoretical investigation of brake squeal with disc brakes installed in rail vehicles

Abstract The squealing of brakes is a very unpleasant noise because of its frequency content and high sound level. As a preliminary measure to clarify the matter, a literature review was carried out to summarize the present state of knowledge of experimental and theoretical investigations. Starting from this base, the structure-borne and air-borne noise of brake squeal was measured in two series of bench tests with parameter variations. In addition, a simulation model was developed which determines the stability of parameter-excited vibrations. This permits investigation of the parameter effects of an actual braking system.