Periodic, shunted piezoelectric patches are applied for the control of wave propagation in beams. The patches are shunted through resonant circuits featuring a single and multiple resonances. The periodic arrangement of shunted patches provides the beam with attenuation properties which depend on the resonant behavior of the shunts. This article specifically illustrates the effectiveness of periodic shunted patches for passive wave propagation control, and focuses on the application of multi-resonant circuits for the generation of multiple attenuation frequency ranges (bandgaps), which can be tuned to target several structural modes of the beam. A numerical model predicts the attenuation characteristics of the beam for different shunting configurations. The experimental implementation of the concept on a beam with five patches illustrates the effectiveness of the method in terms of its attenuation capabilities and its tunable characteristics.
Periodic arrays of shunted piezoelectric patches are employed for the control of waves propagating over the surface of plate structures. The shunted piezoelectric patches act as sources of impedance mismatch, which yield interference phenomena resulting from the interaction between incident, reflected and transmitted waves produced by the mismatch. The impedance mismatch corresponding to the shunted piezos can be tuned to achieve strong attenuation over frequency bands which are defined by the shunting circuit connected to the patches. Broad-band vibration attenuation can be achieved through the application of series and parallel of multiple resonant circuits, or through the implementation of negative capacitance configurations. The ability of plates with periodic shunted piezoelectric patches to attenuate vibrations over extended frequency bands is demonstrated numerically, through Finite Element models of the considered electromechanical structures. The effect of number of patches and of their periodic distributions is investigated together with the analysis and the comparison of performance achieved with various shunting strategies.
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