Abstract
We investigate a metamaterial beam with piezoelectric elements shunted to synthetic impedance circuits to demonstrate elastic wave trapping. We numerically and experimentally demonstrate the so-called rainbow trapping phenomenon, in which elastic waves of different wavelengths are trapped in different regions of the metamaterial beam. Guided by numerical simulations, experiments are performed on a beam with 30 piezoelectric elements with synthetic impedance circuits that have gradually varying inductance. Grading profiles are varied through the digital interface to understand its effect on the wave trapping behavior and conclusions are drawn.
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