The work described in this paper can be divided into two main parts. First, the development and installation of tools to deal with the phenomenon of brake squeal. Secondly, the analysis of the phenomenon by theoretical and experimental means using the tools developed. The main theoretical tool to deal with brake squeal is a simulation software based on general multibody algorithm. This software has been used to describe a 14-DOF model of a floating calliper brake. Ass an experimental tool an automatically controlled brake noise test rig has been installed and operated. Two different excitation mechanisms of squeal generation derived from literature have been incorporated into the model. First, non-conservative restoring forces gave the base for a sensitive analysis showing the influence of parameter variations on the system stability. The results of this investigation were in good agreement with practical experience and lead to design recommendations how to achieve a more silent brake. Especially increasing the distance between connecting points of components in the plane, which is parallel to the rubbing surface of the disc, can improve the dynamic stability of a brake. The second excitation mechanism included in the brake model is a falling friction characteristic, where the parameters have been determined by experiments using the brake noise test rig. It has been shown that by the mechanism the dependence of squeal on brake pressures can be predicted quite exactly. During the work described above it became clear that the complex problem of brake squeal needs an intense combination of experimental and theoretical investigations. There is still a lot of work to be done to design a completely silent brake, but this survey bore tools, methods and knowledge which are fertile base for this aim.
Friction induced brake vibrations
Durch Reibung verursachte Bremsvibrationen
2001
10 Seiten, 13 Bilder, 9 Quellen
Conference paper
English
On Tangential Friction Induced Vibrations in Brake Systems
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