Friction induced vibrations and mode lock-in

In this paper the phenomenon of mode lock-in is investigated, which occurs in structures where vibrations are excited by frictional contact forces. In general "mode lock-in" denotes the coupling of substructure modes which fo rm the vibratory response of the assembly. To study this effect an experime ntal beam-disk set-up was built and a corresponding PE model was generated. A friction model is formulated which incorporates the surface roughness by a statistical distribution. The time-stepping solutions of the FE model we re checked for system resonances and compared to the experimentally observe d mode lock-in.