Unlocking Dynamic Friction: the Frictional Frequency Response

Abstract eng:
Constitutive laws for dynamic friction are discussed, by following two interconnected routes. The first route is experimental, based on systematic measurements of the frictional frequency response function up to mid-high frequencies, which is the required input to perform stability analysis of mechanical systems under steady sliding. It is worth mentioning that previous efforts to explain such measurements from a theoretical model have failed. The second route describes an enhanced rate-and-state model that takes the contact stiffness into account. The described results show that the model can predict the measured dynamic frictional response remarkably well for a range of sliding speeds, normal forces and frequencies, and a systematic methodology to identify the model parameters is described.

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