Rotating Disc model for complex eigenvalue analysis of brake squeal

Modelling of disc rotor is a key step in building a disc brake model for squeal analysis. While braking, the disc is rotating and other components are fixed and there are sliding contact between the pads and the disc. In the most common used complex eigenvalue analysis method, the moving load nature was normally ignored. In this paper a modal based rotating disc model is purposed. Modal parameters of stationary disc were calculated from finite element model. The frequency response function of rotating disc, under which the disc was excited and corresponding responses to be observed at spatial fixed points, was derived. The equivalent modal parameters, which represent the dynamic properties of rotating disc suffering moving loads, were studied. Because of rotating, each mode of the disc split to two complex modes and becomes the superposition of two travelling waves. The conclusion agrees with those from analytical method.