Spatially shaped shunted piezoelectric transducers for vibration control of beams

• Type: Article in International Conference Proceedings Book
• Date: 2010

Authors

Vasques, C.M.A. (Author) FEUP; J. Dias Rodrigues (Author) FEUP

Conference proceedings International

Title: 39th International Congress on Noise Control Engineering 2010, INTER-NOISE 2010

Pages: 4774-4795

39th International Congress on Noise Control Engineering 2010, INTER-NOISE 2010

Lisbon, 13 June 2010 through 16 June 2010

Indexing

Scopus - 0 Citations

Other information

Authenticus ID: P-008-NPJ

Abstract (EN): Under an active control framework, piezoelectric transducers mounted on a host structure are directly actuated under a pre-determined control law in order to mitigate mechanical vibration and/or structural acoustics radiation. Alternatively, they may be connected to passive electrical circuitry, with electrical impedance defined by the resistive, capacitive and inductive elements, which is known as resonant shunt damping. Shunt damping somewhat involves thermal dissipation of the part of the mechanical energy which is converted to an electrical form and depends upon the electrical impedance generated by the external shunt circuit. Spatially shaped distributed piezoelectric transducers/electrodes have been successfully used with the objective of filtering out undesirable mode's contributions, making them unobservable and uncontrollable over the bandwidth of interest, through the use of both modal transducers and spatial filtering technologies. As evidenced from the analysis of spatially shaped transducers, they may yield higher generalized modal electromechanical coupling coefficients that when conveniently used may increase the shunt damping performance. This possibility is investigated in this article for a two-layered adaptive beam structure with spatially shaped resonant shunted piezoelectric transducers. A phenomenological electromechanical analytical model of beams with modal sensing/actuation via spatially shaped distributed shunted piezoelectric transducers/electrodes is derived and the underlying performance is assessed and the advantages discussed.

Language: English

Type (Professor's evaluation): Scientific