Braking Impact of Normal Dither Signals

Author:

Badertscher Jeff1,Cunefare Kenneth A.2,Ferri Aldo A.3

Affiliation:

1. Georgia Institute of Technology, 771 Ferst Drive, Love Building, Room 205, Atlanta, GA 30332

2. Georgia Institute of Technology, 771 Ferst Drive, Love Building, Room 113, Atlanta, GA 30332

3. Georgia Institute of Technology, 771 Ferst Drive, Love Building, Room 107, Atlanta, GA 30332

Abstract

Dither control is a method of introducing high-frequency control efforts into a system to suppress a lower-frequency disturbance. One application of dither control is the suppression of automotive brake squeal. Brake squeal is a problem that has plagued the automotive industry for years. Placing a piezoceramic stack actuator in the piston of a floating caliper brake creates an experimental normal dither system. Many theoretical models indicate a reduction in the braking torque due to the normal dither signal. Using a Hertzian contact stiffness model, the loss in friction is due to lowering the average normal force. There are also theories that the dither signal eliminates the “stick-slip” oscillation causing an effective decrease in the friction force. Yet another theory indicates that the effective contact area is reduced, lowering the mean coefficient of friction. A particular approach considering a single-degree-of-freedom friction oscillator predicts a maximum friction reduction of 10%, occurring at the primary resonance of the system. This paper will concentrate on validating this claim by experimentally determining braking torque reduction for a variety of dither control signals. Several dither control frequencies were chosen at system resonances, while others were chosen at frequencies most likely to provide control of the system. These frequencies were chosen based on previous squeal suppression research. The results indicate that dither control frequencies at system resonances have a greater impact on the braking system’s performance. In general, dither control reduces braking torque by no more than 2%.

Publisher

ASME International

Subject

General Engineering

Reference26 articles.

1. Graf A. , 2001, “Active Control of Automotive Disc Brake Rotor Squeal Using Dither,” Georgia Institute of Technology, Atlanta.

2. Experimental Active Control of Automotive Disc Brake Rotor Squeal Using Dither;Cunefare;J. Sound Vib.

3. ASME, 1994, “Research Needs and Opportunities in the Area of Interaction of Friction and System Dynamics,” ASME Research Report CRTD-Vol. 42, based on an NSF-sponsored workshop on the Interaction of Friction and System Dynamics held in Pittsburgh, PA, August 8–9.

4. Friction Damping and Isolation Systems;Ferri;ASME J. Vibr. Acoust.

5. Normal Vibrations and Friction Under Harmonic Loads: Part I—Hertzian Contacts;Hess;ASME J. Tribol.

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