Suppression of Friction-Induced Oscillations through Use of High-Frequency Dither Signals

Show full item record

Please use this identifier to cite or link to this item: http://hdl.handle.net/1853/7150

Title: Suppression of Friction-Induced Oscillations through Use of High-Frequency Dither Signals
Author: Michaux, Michael Andre
Abstract: Friction-induced oscillations occur in many engineering systems, often resulting in noise, vibration, and excessive or uneven wear. This research addresses the suppression of such oscillations, especially with application to braking systems, through the use of high-frequency dither signals. Brake squeal is an annoying and elusive problem too often present in braking systems of automobiles, trucks and aircraft. In previous work, the effectiveness of high-frequency dither to eliminate squeal in an automotive disc brake assembly was demonstrated experimentally. The main features of the dither-squeal cancellation system was the application of a high frequency variation in the brake pressure force accomplished by means of a piezoelectric stack placed behind one of the brake pads. This thesis contains a theoretical and numerical treatment of the application of dither to frictional systems. Two types of systems are investigated. The first is a classic, mass-on-a-moving belt problem, which experiences friction-induced oscillations similar to those encountered in brake applications. The system is first studied using an analytical technique based on the method of averaging. It is shown that, depending on the system, friction, dither-waveform, and belt-speed parameters, dither can stabilize an unstable system. However, in some cases, dither can destabilize an initially stable system. These results are verified numerically using time integration. The second type of system analyzed in this thesis is an annular plate with a rotating frictional device. The method of multiple scales is used to predict subcritical regions of instability; the results are validated using Floquet theory. The thesis treats both tangential and normal dither, the latter being closer to the brake application. It is found that normal dither, in addition to being harder to analyze, is much less effective than tangential dither.
Type: Dissertation
URI: http://hdl.handle.net/1853/7150
Date: 2005-06-24
Publisher: Georgia Institute of Technology
Subject: Vibration
Dither
Squeal
Brakes
Friction
Nonlinear
Oscillations
Automobiles Brakes Noise
Damping (Mechanics)
Friction
Department: Mechanical Engineering
Advisor: Committee Co-Chair: Aldo A. Ferri; Committee Co-Chair: Kenneth A. Cunefare; Committee Member: Jerry H. Ginsberg; Committee Member: Laurence J. Jacobs; Committee Member: Olivier A. Bauchau
Degree: Ph.D.

All materials in SMARTech are protected under U.S. Copyright Law and all rights are reserved, unless otherwise specifically indicated on or in the materials.

Files in this item

Files Size Format View
michael_michaux_a_200508_phd.pdf 1.266Mb PDF View/ Open

This item appears in the following Collection(s)

Show full item record