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|Main Title:||Reduction of friction by normal oscillations. II. In-plane system dynamics|
Popov, Valentin L.
|Abstract:||The influence of out-of-plane oscillations on friction is a well-known phenomenon that has been studied extensively with various experimental methods, e.g., pin-on-disk tribometers. However, existing theoretical models have yet achieved only qualitative correspondence with experiment. Here we argue that this may be due to the system dynamics (mass and tangential stiffness) of the pin or other system components being neglected. This paper builds on the results of a previous study  by taking the stiffness and resulting dynamics of the system into account. The main governing parameters determining macroscopic friction, including a dimensionless oscillation amplitude, a dimensionless sliding velocity and the relation between three characteristic frequencies (that of externally excited oscillation and two natural oscillation frequencies associated with the contact stiffness and the system stiffness) are identified. In the limiting cases of a very soft system and a very stiff system, our results reproduce the results of previous studies. In between these two limiting cases there is also a resonant case, which is studied here for the first time. The resonant case is notable in that it lacks a critical sliding velocity, above which oscillations no longer reduce friction. Results obtained for the resonant case are qualitatively supported by experiments.|
|DDC Class:||530 Physik|
macroscopic friction coefficient
|Creative Commons License:||https://creativecommons.org/licenses/by/4.0/|
|Publisher Place:||Berlin, Heidelberg|
|Appears in Collections:||Technische Universität Berlin » Fakultäten & Zentralinstitute » Fakultät 5 Verkehrs- und Maschinensysteme » Institut für Mechanik » Fachgebiet Systemdynamik und Reibungsphysik » Publications|
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|10.1007_s40544-017-0146-x.pdf||2.28 MB||Adobe PDF|
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