6 papers · 1 filter
Adiabatic edge-to-edge transformations in time-modulated elastic lattices and non-Hermitian shortcuts
Emanuele Riva, Gianmaria Castaldini, Francesco Braghin
The temporal modulation of a relevant parameter can be employed to induce modal transformations in Hermitian elastic lattices. When this is combined with a proper excitation mechan…
Experimental observation of temporal pumping in electro-mechanical waveguides
Yiwei Xia, Emanuele Riva, Matheus I. N. Rosa +4
We experimentally demonstrate temporal pumping of elastic waves in an electromechanical waveguide. An aluminum beam covered by an array of piezoelectric patches connected to shunt…
Experimental investigation of amplification, via a mechanical delay-line, in a rainbow-based metasurface for energy harvesting
Jacopo M. De Ponti, Andrea Colombi, Emanuele Riva +4
We demonstrate that a rainbow-based metasurface, created by a graded array of resonant rods attached to an elastic beam, operates as a mechanical delay-line by slowing down surface…
Adiabatic pumping via avoided crossings in stiffness modulated quasiperiodic beams
Emanuele Riva, Vito Casieri, Ferruccio Resta +1
In this manuscript we report on adiabatic pumping in quasiperiodic stiffness modulated beams. We show that distinct topological states populating nontrivial gaps can nucleate avoid…
Experimental observation of non-reciprocal band-gaps in a space-time modulated beam using a shunted piezoelectric array
Jacopo Marconi, Emanuele Riva, Matteo Di Ronco +3
In this work we experimentally achieve 1 kHz-wide directional band-gaps for elastic waves spanning a frequency range from approximately 8 to 11 kHz. One-way propagation is induced…
Non-reciprocal wave propagation in discretely modulated spatiotemporal plates
Emanuele Riva, Matteo Di Ronco, Gabriele Cazzulani +1
We investigate non-reciprocal wave propagation in spatiotemporal phononic plates. In particular, the first goal of this manuscript is to present a general formulation of the Plane…