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Proceedings Paper

Passive piezoelectric damping tuned by using measured electrical impedance
Author(s): Jaehwan Kim; Jin-Young Choi
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Paper Abstract

In this paper, multi-mode piezoelectric shunt damping and the damping performance comparison according to different piezoelectric materials are studied. Multi-mode damping is tried by using a newly proposed tuning method. This method is based on electrical impedance model and maximizing the dissipated energy at the shunt circuit. By measuring the electrical impedance at the piezoelectric patch bonded on a structure, an equivalent electrical model is constructed near the system resonance frequency. After shunting elements are connected to the equivalent circuit, the shunt parameters are optimally searched based on the criterion of maximizing the dissipated energy at the shunt circuit. This is for a single mode and it is expanded to multi-mode damping. Cantilever beam is taken as examples. Piezoceramics are bonded near root of the beam and electrical impedance is measured using HP 4192 impedance analyzer. Small electronic shunt circuits are made according to the found optimal shunt parameters. The first and second vibration modes are damped out independently. However, it was found that the presence of the shunt circuit tuned for the second resonance deteriorates the electrical impedance near the first resonance. Discussion on this fact is provided. The piezoelectric damping performance is compared according to different piezoelectric materials. Three piezoelectric materials are selected: PZT-5, PZN-PT single crystal and QuickPack IDE actuator. When resonant shunt circuit is considered, the use of PZN-PT single crystal exhibited the best piezoelectric damping performance. When IDE actuator is used with resistive shunt, although the tip displacement reduction is not so large, the first and second resonance modes can be damped out by a simple passive electronics- a resistor.

Paper Details

Date Published: 2 July 2001
PDF: 12 pages
Proc. SPIE 4331, Smart Structures and Materials 2001: Damping and Isolation, (2 July 2001); doi: 10.1117/12.432726
Show Author Affiliations
Jaehwan Kim, Inha Univ. (South Korea)
Jin-Young Choi, Inha Univ. (South Korea)

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

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