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Proceedings Paper

Method for multiple-mode shunt damping of structural vibration using a single PZT transducer
Author(s): Shu-yau Wu
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Paper Abstract

We report a method for passive piezoelectric shunt-damping of multiple vibration modes using a single piezoelectric transducer (PZT). The method, which is different from other multiple-mode shunting, is to employ a 'blocking' circuit in series with each parallel resistor-inductor shunt circuit designed for one structural mode. The 'blocking' circuit consists of one parallel capacitor-inductor antiresonant circuit or a series of them. The number of antiresonant circuits in each branch circuit depends on the number of the structural modes to be shunt-damped simultaneously. These antiresonant circuits are designed to produce infinite electrical impedance, or antiresonance, at the natural frequencies of all other resistor-inductor shunt circuits. Each branch circuit is functional only at its own mode frequency but is open-circuited at all other mode frequencies. Therefore, when all branches are connected to the PZT terminals, they do not interfere with each other. The method is also easier and more reliable for fine-tuning and optimization operation. We analyze first the multiple-mode shunt-damping circuit with both the generalized circuit and the modified circuit derived from it which is to reduce the number of antiresonant circuits and to make the circuit operation simpler. Experimentally we have employed modified shunt circuits and successfully demonstrated vibration reduction of two and three structural modes using a single PZT transducer bonded on a two-wing aluminum cantilever beam. For three-mode shunt damping, the resonant amplitudes at 206, 348.5, and 484.5 Hz are reduced for 13.28, 7.30, and 9.45 dB, respectively.

Paper Details

Date Published: 16 June 1998
PDF: 10 pages
Proc. SPIE 3327, Smart Structures and Materials 1998: Passive Damping and Isolation, (16 June 1998); doi: 10.1117/12.310680
Show Author Affiliations
Shu-yau Wu, The Boeing Co. (United States)

Published in SPIE Proceedings Vol. 3327:
Smart Structures and Materials 1998: Passive Damping and Isolation
L. Porter Davis, Editor(s)

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