Passive Vibration Control with Shunted Modal Piezoelectric Transducers

• Type: Article in International Conference Proceedings Book
• Date: 2009

Authors

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

Conference proceedings International

Title: IV ECCOMAS Thematic Conference on Smart Structures and Materials

Pages: 1-20

IV ECCOMAS Thematic Conference on Smart Structures and Materials

FEUP, 13-15 Julho 2009

Scientific classification

FOS: Engineering and technology > Mechanical engineering

CORDIS: Technological sciences > Engineering > Mechanical engineering > Vibration engineering

Other information

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: Portuguese

Type (Professor's evaluation): Scientific