, Volume 56, Issue 4, pp 381-387
Date: 12 Aug 2008

Fractional describing function of systems with Coulomb friction

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Abstract

This paper studies the describing function (DF) of systems constituted by a mass subjected to nonlinear friction. The friction force is decomposed into two components, namely, the viscous and the Coulomb friction. The system dynamics is analyzed in the DF perspective revealing a fractional-order behavior. The reliability of the DF method is evaluated through the signal harmonic contents.