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An adaptive negative capacitance circuit for enhanced performance and robustness of piezoelectric shunt damping

Pohl, Martin (2017) An adaptive negative capacitance circuit for enhanced performance and robustness of piezoelectric shunt damping. Journal of Intelligent Material Systems and Structures. SAGE Publications. ISSN 1045-389X

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Abstract

Piezoelectric shunt damping is investigated as one possible solution for improving the vibroacoustic behavior of noise-prone lightweight structures. The negative capacitance shunt circuit appears to be best choice due to its broadband damping effect. Usually it is built from analog electronic components, such as operational amplifiers, resistors and capacitors. In terms of damping efficiency and the vibroacoustic behavior of the circuit, the capacitance ratio between the negative capacitance and the inherent capacitance of the piezoelectric transducer is of major concern. For laboratory setups, this ratio may be adjusted manually, but for real applications, this is not suitable due to a lack of damping or the risk of instability of the circuit. Therefore an improved approach is presented in this paper, where a concept for an adaptive negative capacitance circuit is presented. An electronically tunable resistor is used to change the value of the negative capacitance to the best fit for the present conditions. Adjustment laws for the ideal value of this resistor are derived from the transfer function of the whole circuit. Finally a prototype board is designed and experimentally tested at a beam structure. It can be shown, that the adaptive circuit allows a tighter adjustment to the edge of stability resulting in higher damping or, in the case of too high vibration amplitudes, prevents the output voltage from saturating.

Item URL in elib:https://elib.dlr.de/116527/
Document Type:Article
Title:An adaptive negative capacitance circuit for enhanced performance and robustness of piezoelectric shunt damping
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Pohl, MartinMartin.Pohl (at) dlr.deUNSPECIFIED
Date:2017
Journal or Publication Title:Journal of Intelligent Material Systems and Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Publisher:SAGE Publications
ISSN:1045-389X
Status:Published
Keywords:piezoelectric shunt damping, negative capacitance, vibration damping, adaptive systems
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Systems and Cabin
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Pohl, Martin
Deposited On:05 Dec 2017 08:50
Last Modified:10 Jan 2019 15:48

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