Instabilités de frottement : Approches temporelle et fréquentielle

A. Meziane (1, 2) , Laurent Baillet (3) , Bernard Laulagnet (4)

1 LaMCoS - Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne]
2 TMI - Tribologie et Mécanique des Interfaces
3 LGIT - Laboratoire de Géophysique Interne et Tectonophysique
4 LVA - Laboratoire Vibrations Acoustique

The vibrations generated at the interface between the two bodies in friction are responsible for various noises such as squealing, juddering, hammering, hooting, etc... In order to model and understand friction-induced vibration phenomenon, two approaches are compared in this article: temporal approach and modal approach. This analysis has been made on a simplified system composed of two beams in contact. The two different approaches have been programmed using Finite Element method. Assumptions on the contact calculation are different for the two approaches. Modal approach consists in calculating eigenvalues of the friction coupled system. Instabilities appear when a pair of modes merges. Eigenvalues with positive real parts are identified as potentially unstable modes. Temporal approach calculates the evolution of displacements, velocities, accelerations, forces ... One speaks about instabilities when stick or separation zones appear in the contact surfaces. With this approach frequencies which are excited during instability are obtained. Results have been compared and both methods give coherent and complementary results.

Domains: Earth Sciences

A. Meziane, Laurent Baillet, Bernard Laulagnet. Instabilités de frottement : Approches temporelle et fréquentielle. XVième Congrès Vibrations Chocs et Bruit, 2006, Lyon, France. pp. 25. ⟨insu-00355505⟩