Broadband attenuation in phononic beams induced by periodic arrays of feedback shunted piezoelectric patches

The effect of periodic arrays of feedback shunted piezoelectric patches in the flexural wave attenuation of phononic beams is analyzed theoretically and experimentally. A numerical model based on transfer matrix methodology is developed to predict the transmission of vibration and the frequency ranges of the band gaps. Broadband vibration attenuations are observed in or out of the band gaps. The proposed concept is validated on a suspended epoxy beam driven by a shaker, and the experimental results are presented in terms of the vibration transmissions recorded using two accelerometers placed on both sides of the beam.