Validation of a new frictional law for simulating friction-induced vibrations of rough surfaces

Friction-induced vibrations are a complex phenomenon, arising when two surfaces undergo relative sliding. During the last decades many studies on friction-induced vibrations have been carried out, where the simulation of the contact dynamic excitation has always been a challenge to face. This work proposes a new method to reproduce the local dynamic excitation from the contact and its effect on the vibrational response of the system. A friction law including a perturbative term of the friction coefficient is introduced. The evolution of the perturbative term, recovered by dedicated experiments, allows for simulating and analysing the contact excitation mechanisms. The comparisons between numerical and experimental results show good correlation between the measured vibrations and the ones simulated numerically, validating the proposed friction law.