A study on brake squeal using a beam-on-disc model

In this paper the phenomenon of mode lock-in is investigated, which occurs in structures where vibrations are excited by frictional contact forces, as for example at disc brakes. In general "mode lock-in" denotes the coupling of substructure modes which form the vibratory response of the assembly, leading e.g. to brake squeal. For studying this effect an experimental beam-disk set-up was built and a corresponding FE model was generated. A presented normal and tangential contact law is based on the statistical distribution of contacting asperities derived from measured surface roughness profiles. The time-stepping solutions of the FE model were checked for system resonances and compared to the experimentally observed mode lock-in.