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Proceedings Paper

Mechanical damping induced by switching of piezoelectric elements
Author(s): Claude Richard; Daniel Guyomar; David Audigier; Claudine Gehin
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Paper Abstract

The proposed technique is based on an intermittent switching of piezoelectric elements bonded on the structure to be d amped. As a result of the switching, the global losses coefficient of the structure is increased by a significant factor. From a physical point of view, the damping results from the energy dissipation due to the discharge of the piezoelement capacitance in the switch resistance. The switch has to be controlled and thus requires an electrical power about a few milliwatts for be activated. Consequently, the described approach is considered to be a semi-passive technique. For enhanced effects, the switching sequence has to be optimized. No tuning elements such as inductors or resistor1 are required, consequently the switching method can operate at any frequency, in particular in the low frequency regime, and is inherently broadband. Transient or continuous vibrations are damped with a comparable efficiency. A theoretical model is proposed to interpret the experimental results, to give a comprehensive understanding of the underlying physics and to optimize the switching sequence. It is show that, unlike standard passive techniques, the added damping in non-newtonian but, indeed exhibits a dry friction behavior. Numerous experimental results are given for flexural damping of steel cantilever beam and aluminum plate. It is shown that the damping efficiency can be up to 20 dB for the steel beam configuration. Harmonic and transient regimes of the beams are considered and compared. The design of electronic switching board and power requirements of the micro-controller are discussed.

Paper Details

Date Published: 24 August 2000
PDF: 16 pages
Proc. SPIE 4073, Fifth European Conference on Smart Structures and Materials, (24 August 2000); doi: 10.1117/12.396403
Show Author Affiliations
Claude Richard, INSA Lyon (France)
Daniel Guyomar, INSA Lyon (France)
David Audigier, INSA Lyon (France)
Claudine Gehin, INSA Lyon (France)

Published in SPIE Proceedings Vol. 4073:
Fifth European Conference on Smart Structures and Materials
Pierre Francois Gobin; Clifford M. Friend, Editor(s)

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