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Brake Squeal – Mechanisms and Counter Measures

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Abstract:
Due to increased interest of car customers in comfort features, brake squeal has become a major concern to brake manufacturers. Even though this problem has extensively been studied a solution to develop a silent brake from an early design stage is not found yet. The aim of this talk is to give an overview of principle models which describe brake squeal and to introduce counter measures to avoid these friction induced vibrations, where the focus is placed on methods that utilize shunted piezoceramics as sensors and actors. These vibration controls can be classified as passive, semi – passive and active. In particular the possibility to increase the damping performance with a synthetic negative capacitance circuit will be presented. The analytical results are validated by measurements on a test rig of an automotive disc brake which has been modified in order to incorporate piezoceramics.

Type of Seminar:
Public Seminar
Speaker:
Dipl.-Ing. Marcus Neubauer
Institut für Mechanik / Universität Hannover, Hannover, Germany
Date/Time:
May 26, 2005   17:00
Location:

ETH Zentrum, Physikstrasse 3, Building ETL, Room K 25
Contact Person:

D. Niederberger
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Biographical Sketch:
Marcus Neubauer is a scientific co-worker of Prof. Popp at the Institute of Mechanics at the University of Hannover since October 2003. He studied mechanical engineering at the University of Hannover and won Dr. Ulderup foundation prizes in 1999 and 2003. His fields of interest include the mechanisms of friction induced vibrations with disc brakes as a particular application and vibration control via shunted piezoceramics and synthetic negative capacitances.