Abstract
Vibration damping using shunted piezoceramics was the focus of many researches, in particular during the last decade, as attested by the frequent surveys [1, 2, 3]. Most investigations have concerned the classical transverse-mode of piezoceramics which uses the material electromechanical coupling coefficient (EMCC) k31. However, the longitudinal-mode, exploiting the highest EMCC k33, has been much less investigated. Both modes provide the so-called Extension Shunted Damping (ESD) [4]. The shear-mode, which uses the EMCC k15 with a value very close to k33, has been studied only recently [5]. It has been shown that it provides the so-called Shear Shunted Damping (SSD). The ESD has been investigated with resistive, resonant or capacitive shunts; while the SSD has been evaluated only with a resistive shunt. It is then the objective of this proposal to present, for the first time, the theoretical formulation and finite element investigation of the use of the shear-mode piezoceramics for resonant shunted vibration damping. Preliminary results for the first two modes of a vibrating aluminium beam with sandwiched (axially polarized) piezoceramic patches indicate that, unlike ESD, resonant shunting does not enhance much the SSD compared to the resistive shunting. Moreover, it is found that resistive SSD is almost as efficient as a resonant ESD. The latter result is very interesting since the resistive shunting is easier to implement (no tuning and no huge unphysical inductance) than the resonant one.
Published Version
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