High-performance large-scale simulation of multi-stable metastructures

Hwang, Myungwon; Scalo, Carlo; Arrieta, Andres F.

doi:10.1016/j.cpc.2022.108365

Cited by 2 publications

(2 citation statements)

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“…The frequency spectra of the resulting phonons are obtained by the same technique described in section 4 but for 2 s of the velocity data corresponding to the phonons at 1000 Hz sampling rate. The experimental observations are qualitatively in agreement with the simulated results: irrespective of the input conditions, the frequency response of the induced phonons at an internal unit cell shows that the dominant frequency peaks occur near a fixed value (66)(67)(68). The slight discrepancy in the dominant frequencies between the compressive and tensile input cases is mainly due to the magnetic influence, which tends to repulse the masses away from one another, resulting in asymmetry between the two stable equilibria.…”

Section: Experimental Responsesupporting

confidence: 86%

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Topological wave energy harvesting in bistable lattices

Hwang

Arrieta

2021

Smart Mater. Struct.

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In this paper, we present an input-independent energy harvesting mechanism exploiting topological solitary waves. This class of medium transforming solitons, or transition waves, entails energy radiation in the form of trailing phonons in discrete bistable lattices. We observe numerically and experimentally that the most dominant frequencies of these phonons are invariant to the input excitations as long as transition waves are generated. The phonon energy at each unit cell is clustered around a single invariant frequency, enabling input-independent resonant harvesting with conventional energy transduction mechanisms. The presented mechanism fundamentally breaks the link between the unit cell size and the metamaterial’s operating frequencies, offering a broadband solution to energy harvesting that is particularly robust for low-frequency input sources. We further investigate the effect of lattice discreteness on the energy harvesting potential, observing two performance gaps and a topological wave harvesting pass band where the potential for energy conversion increases almost monotonically. The observed frequency-invariant phonons are intrinsic to the discrete bistable lattices, enabling broadband energy harvesting to be an inherent metamaterial property.

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Section: Experimental Responsesupporting

confidence: 86%

“…Also, very light damping ( b1 = 0.05) is applied to attenuate phonons in the length of the lattice. All the numerical simulations in this paper are performed with an in-house Fortran solver, which has been thoroughly validated for general systems with bistable microstructures [67].…”

Section: Bistable Lattice Modelmentioning

confidence: 99%