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Experimental and theoretical investigation of creep groan of brakes through minimal models
Author(s) -
Zhao Xingwei,
Gräbner Nils,
von Wagner Utz
Publication year - 2016
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.201610136
Subject(s) - creep , brake , limit cycle , disc brake , stiffness , mechanics , vibration , backlash , bifurcation , limit (mathematics) , engineering , structural engineering , physics , nonlinear system , mechanical engineering , mathematics , mathematical analysis , quantum mechanics , thermodynamics
Creep groan of brake systems is a low frequency vibration phenomenon occurring at low speeds which can make passengers feel uncomfortable. This phenomenon is caused by the stick‐slip‐effect resulting in limit cycle oscillations with frequencies lower than 200 Hz. For the experimental investigation of this problem, an idealized brake test rig is designed concentrating on the investigation of the frictional contact by realizing low damping and small disturbances in the system. Different sensors are utilized in the test rig. Limit cycles and bifurcation effects can be observed in the experimental results. With respect to modeling, a one degree‐of‐freedom (DOF) model using Coulomb's friction law and a two DOF model using the bristle friction law are considered. In a comparative study of experimental and simulation results, the parameters of both friction laws can be identified from the dynamic experimental results, such as the static and dynamic friction coefficients, contact stiffness and Stribeck velocity. Experimental and theoretical results show a very good concordance. (© 2016 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)