How important is the friction model on the modeling of energy dissipation

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Abstract

Frictional forces arising from the relative motion of two contacting surfaces are a well-known source of energy dissipation. Sometimes this is an unwanted effect of the design, but it can also be intentionally used to increase the damping of a certain system in a simple and cost-effective way. In an earlier work the energy dissipation of a 1-degree of freedom (DOF) system with Coulomb friction has been analytically studied for a friction law with equal dynamic en static friction forces en with a static friction force larger than the dynamic friction force. Closed-form expressions for the maximum energy dissipation per cycle and the optimal friction force were obtained. In the present work numerical simulations are performed with several different friction models currently used in the literature. For the stick phase smooth approximations like viscous damping or the arctan function are considered and the non-smooth switch friction model. For the slip phase several models of the Stribeck effect are used. The goal of this study is, for a given stable periodic solution, to determine the influence of the friction model on the predicted energy dissipation per cycle and especially on the maximum energy dissipation and the optimum friction force.
Original languageEnglish
Title of host publicationProceedings of the Fifth Euromech Nonlinear Dynamics Conference (ENOC 2005), 7-12 August 2005, Eindhoven, The Netherlands
Pages363-368
Publication statusPublished - 2005

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