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Improved resistive shunt by means of negative capacitance: new circuit, performances and multi-mode control

Type
Articles dans des revues avec comité de lecture
Author
BERARDENGO, Marta
125443 Politecnico di Milano [Milan]
THOMAS, Olivier
GIRAUD-AUDINE, Christophe
13338 Laboratoire d’Électrotechnique et d’Électronique de Puissance - EA 2697 [L2EP]
13338 Laboratoire d’Électrotechnique et d’Électronique de Puissance - EA 2697 [L2EP]
MANZONI, Stefano
125443 Politecnico di Milano [Milan]

URI
http://hdl.handle.net/10985/11320
DOI
10.1088/0964-1726/25/7/075033
Date
2016
Journal
Smart Materials and Structures

Abstract

This paper deals with vibration control by means of piezoelectric patches shunted with electrical impedances made up by a resistance and a negative capacitance. The paper analyses most of the possible layouts by which a negative capacitance can be built and shows that a common mathematical description is possible. This allows closed formulations to be found in order to optimise the electrical network for mono- and multi-mode control. General analytical formulations are obtained to estimate the performance of the shunt in terms of vibration reduction. In particular, it is highlighted that the main effect of a negative capacitance is to artificially enhance the electromechanical coupling factor, which is the basis of performance estimation. Stability issues relating to the use of negative capacitances are especially addressed using refined models for the piezoelectric patch capacitance. Furthermore, a new circuit based on a couple of negative capacitances is proposed and tested, showing better performances than those provided by the usual layouts with a single negative capacitance. Finally, guidelines and analytical formulations to deal with the practical implementation of negative capacitance circuits are provided.

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