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Proceedings Paper

Active tuning and coupling enhancement of piezoelectric vibration absorbers for variable-frequency harmonic excitations in multiple-degrees-of-freedom mechanical systems
Author(s): Ronald A. Morgan; Kon-Well Wang; Jiong Tang
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Paper Abstract

It has been shown that piezoelectric materials can be used as electromechanical vibration absorbers when they are shunted by an electrical network. Semi-active piezoelectric absorbers have also been proposed for the purpose of suppressing harmonic excitations with varying frequencies. These semi- active devices can be constructed using a variable inductance or variable capacitance element in the shunt circuit, however both of these implementations have several limitations that restrict their practical use. The design presented here is a high performance alternative to semi-active absorbers that uses a combination of a passive RL circuit and an adaptive feedback law to suppress harmonic excitations with varying frequency. The adaptive tuning is accomplished by simulating a variable inductor using feedback. An equation for the optimal tuning of the piezoelectric absorber on a general MDOF structure is derived. Next, it is illustrated that the performance and robustness of the piezoelectric absorber can be increased by using additional active actions to reduce the circuit resistance and enhance the coupling of the piezoelectric. Two methods for increasing the effective coupling of the absorber are examined -- a negative capacitance shunt and active coupling feedback. Finally, the effectiveness of the proposed algorithm is demonstrated experimentally.

Paper Details

Date Published: 22 June 2000
PDF: 12 pages
Proc. SPIE 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems, (22 June 2000); doi: 10.1117/12.388852
Show Author Affiliations
Ronald A. Morgan, The Pennsylvania State Univ. (United States)
Kon-Well Wang, The Pennsylvania State Univ. (United States)
Jiong Tang, The Pennsylvania State Univ. (United States)


Published in SPIE Proceedings Vol. 3985:
Smart Structures and Materials 2000: Smart Structures and Integrated Systems
Norman M. Wereley, Editor(s)

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