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High Precision Measurements of Topography for Brake Components
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 28, 2014 by SAE International in United States
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There are few principal excitation mechanisms that brake system NVH simulations are based on, especially the high frequency squeal simulations. These mechanisms can be described by some simple mechanical models that exhibit excitation or self-excitation effects induced by friction [1, 2]. These models use very simple friction laws of Coulomb type, described by a friction coefficient that is either a constant or simple functions of some state variables, taking into account a Stribeck characteristic.
Measurements from the AK-Master or SAE J2521, however, show that the friction coefficient is not a simple function of some state variables, describing a steady state behavior of friction. In the past several years, material dependent descriptions of the frictional brake interface have started attracting attention . These aspects are greatly influenced by the tribological effects at the frictional interface, which can be characterized by typical wear patterns.
To get a better understanding of the friction mechanisms between the brake pad and the disk, the topography of the disk must be measured using in-situ nondestructive methods, which must be very fast because of the size of the data set and also highly accurate to attain, for example, the wear properties of ceramic disks.
In this work, a fast contactless method to measure the topography and the wear of the brake disk will be presented. Here a laser triangulation sensor mounted on a linear stage, scans radially the surface of the disk, which is connected on a high precision electric motor. In this way the total topography of the disk can be measured, a single profile in radial direction as well as a single profile in tangential direction along the disk. Using the radial profiles statements can be made about roughness parameters, and the tangential profiles can be used to determine axial run out and waviness of the disk.
CitationSchramm, T. and Ostermeyer, G., "High Precision Measurements of Topography for Brake Components," SAE Technical Paper 2014-01-2522, 2014, https://doi.org/10.4271/2014-01-2522.
- Cantoni , C. , Cesarini , R. , Mastinu , G. , Rocca , G. , Sicigliano , R. Brake comfort - a review Vehicle Systems Dynamics 47 8 901 947 2009 10.1080/00423110903100432
- Ostermeyer , G. , Dynamic Friction Laws and Their Impact on Friction Induced Vibrations SAE Technical Paper 2010-01-1717 2010 10.4271/2010-01-1717
- Ostermeyer , G.P. On the dynamics of the friction coefficient WEAR 254 852 858 2003 10.1016/S0043-1648(03)00235-7
- Baumüller GmbH Betriebsanleitung, Drehstrom-Synchronmotoren DSC 45-100..540 V 2012
- Micro-Epsilon Messtechnik GmbH Betriebsanleitung, optoNCDT 2300 2012
- Steinmeyer Mechatronik GmbH Datenblatt, Linearachse PMT200 2012
- Ostermeyer , G. and Perzborn , N. , Dynamic Friction Measurements, Especially for High Power Applications SAE Technical Paper 2011-01-2373 2011 10.4271/2011-01-2373
- Bode , K. , Schramm , T. , Perzborn , N. , Raczek , S. , Münchhoff , J. , Ostermeyer , G.P. Low μ at Low pressure - Potential for Reducing Residual Drag Eurobrake 2014 May 2014