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Proceedings Paper

Reduction of friction using piezoelectrically excited ultrasonic vibrations
Author(s): Walter Littmann; Heiner Storck; Joerg Wallaschek
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Paper Abstract

Piezoelectric materials are an important class of smart materials for the generation of mechanical ultrasonic vibrations. In industrial applications (for example ultrasonic cutting) the frictional contact of the vibrating tool with the workpiece is of special importance. A common observation at the contact zone is that frictional forces can be significantly reduced by superposition of ultrasonic vibrations. In this report we present a theoretical explanation for the reduction of friction. A basic system, consisting of a longitudinal ultrasonic vibrator sliding on a plane, is investigated. It is shown that a modification of Coulomb's friction law can be applied to this kind of vibrating friction contact. The macroscopically observed friction-force with ultrasonic vibration depends on the sliding velocity and the velocity of vibration: For sliding velocities higher than the vibration-amplitude the frictional force is not changed by vibration. But for small sliding velocities the friction-coefficient is significantly reduced and almost approaches zero for very slow sliding-velocity. The theoretical results were confirmed systematically by experimental investigations done on a specially designed test-rig. Energy considerations are used to calculate the ultrasonic energy which is required to achieve a prescribed reduction of the frictional forces. The model is also used for sensing the vibration-amplitude as well as the sliding-velocity without an additional sensor.

Paper Details

Date Published: 2 July 2001
PDF: 10 pages
Proc. SPIE 4331, Smart Structures and Materials 2001: Damping and Isolation, (2 July 2001); doi: 10.1117/12.432714
Show Author Affiliations
Walter Littmann, Univ. Paderborn (Germany)
Heiner Storck, Univ. Paderborn (Germany)
Joerg Wallaschek, Univ. Paderborn (Germany)

Published in SPIE Proceedings Vol. 4331:
Smart Structures and Materials 2001: Damping and Isolation
Daniel J. Inman, Editor(s)

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