Abstract
The basis for the analysis of friction in brake systems is the brake pad’s tribological interface. An investigation of this interface reveals friction intensive surface structures. These so-called “patches” are extremely hard and carry the main part of the friction power. By complex interaction processes of wear and heat these patches are generated permanently but leave the system after a certain period of time. So there is an equilibrium of flow of contact patches in the brake pad interface, with the outcome being a dynamic macroscopic friction coefficient, whose “inertia” can be well described by differential equations in the form of special balance equations. Systematic expansions of these balance equations even allow, for the first time, a simulation of different test cycles of the AK-Master test for friction materials with high accuracy. These friction force variations are generated by the dynamics of the local surface geometry and can explain physically effects of measurements, which were up to now described by control theoretic approximations [7, 8].
Beside these effects the dynamics of friction is influenced by lateral vibrational dynamics of these patches on a very fast timescale. This timescale is so fast that processes of patch growth and destruction are negligible. Beyond that, the vibration frequencies of the patches, as well as the actual local friction power on each of these surface structures, vary over a wide range of values, which is the result of a great variety of patch sizes and heights in the interface. Generally, one would expect a smoothing of these local and stochastically distributed vibration effects. It can however be shown, that the oscillations of the patches are subject to synchronization processes, with the result being in-phase patch vibrations on macroscopic areas of the brake pad of significant size. Thereby, self-excited vibrations of the patches can lead to lateral oscillations of the pad’s friction force on a macroscopic scale. These are able to excite the whole system of brake pad and disk.
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© 2009 Springer-Verlag Berlin Heidelberg
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Ostermeyer, G.P. (2009). On Tangential Friction Induced Vibrations in Brake Systems. In: Grove Thomsen, P., True, H. (eds) Non-smooth Problems in Vehicle Systems Dynamics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-01356-0_9
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DOI: https://doi.org/10.1007/978-3-642-01356-0_9
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