Transversal–rotational and zero group velocity modes in tunable magneto-granular phononic crystals

Allein, Florian; Tournat, Vincent; Gusev, Vitalyi; Theocharis, G.

doi:10.1016/j.eml.2016.08.001

Cited by 22 publications

(12 citation statements)

References 26 publications

(27 reference statements)

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“…Granular crystals, as these systems became known, can be considered a class of phononic crystal [4] with unique behavior specific to granular media. For instance, in addition to nonlinear effects such as solitons and discrete breathers [2,3], unusual linear phenomena such as the existence of rotational acoustic modes have been revealed [5,6]. Due to the nonlinearity of Hertzian contacts, the acoustic properties of granular crystals can be easily tuned, for example, by applying static compression, which makes them attractive for potential applications [3].…”

Section: Introductionmentioning

confidence: 99%

Vibrational dynamics of a two-dimensional microgranular crystal

et al. 2017

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We study the dynamics of an ordered hexagonal monolayer of polystyrene microspheres adhered to a glass substrate coated with a thin aluminum layer. A laser-induced transient grating technique is employed to generate and detect three types of acoustic modes across the entire Brillouin zone in the −K direction: low-frequency contact-based modes of the granular monolayer, high-frequency modes originating from spheroidal vibrations of the microspheres, and surface Rayleigh waves. The dispersion relation of contact-based and spheroidal modes indicates that they are collective modes of the microgranular crystal controlled by particle-particle contacts. We observe a spheroidal resonance splitting caused by the symmetry breaking due to the substrate, as well as an avoided crossing between the Rayleigh and spheroidal modes. The measurements are found to be in agreement with our analytical model.

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Section: Introductionmentioning

confidence: 99%

Vibrational dynamics of a two-dimensional microgranular crystal

et al. 2017

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“…Review on the topic has been prepared by Hadjesfandiari and Dargush [38], which concluded that when an elastic wave propagates through the medium considered in accordance with generalized elasticity concepts, its elements undergo angular motions. Despite the fact that the micromorphic approach is more visible in acoustics or in the studies on various materials than in the geophysics, recent [39][40][41] search for laboratory confirmation of the micromorphic concepts of seismic rotation yielded sound results, as well.…”

Section: Seismic Rotation In Various Continuum Modelsmentioning

confidence: 99%

Measurement of Rotational Events in Regions Prone to Seismicity: A Review

Jaroszewicz¹,

Kurzych²,

Teisseyre³

et al. 2018

Geophysics

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On the basis of the explanation of rotational seismology as an area of study, a modern approach to the seismic rotation in various continuum models is summarized. The aim of this chapter is to formulate the fundamental requirements for rotational seismometer. Consequently, a review of all existing technologies of rotational seismometers including mechanical, electrochemical, magnetohydrodynamical, as well as optical type solutions is discussed. The analysis of their parameters that considers technical requirements enforced by rotational seismology has indicated an optical instrument using a Sagnac interferometer as the best solution. Fibre-Optic System for Rotational Events & phenomena Monitoring (FOSREM) with its main parameters and features is described as an example of such solution. Moreover, the example of rotational events recorded in Książ observatory, Poland, using mechanical rotational seismometers and FOSREM is presented. There are data for M = 3.8 earthquake near Jarocin, Poland on the 2012.01.06 at 15:37:56 at a distance of about 200 km from Książ. Although the used devices have totally different designs, the results obtained using FOSREM and the results calculated by mechanical devices show compatibility in rotational signals.

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“…The tunability of contact mechanics via external precompression has been explored at the mesoscale for multiple engineering applications, e.g., filters [15][16][17], acoustic lenses [18], and rectifiers [19]. More recently, external magnetic fields have been used to control the dynamics of ferromagnetic beads for the realization of one-dimensional tunable magnetogranular chains, where the interparticle contact forces are varied by changing the applied field [20,21]. The prospect of achieving tunability by using external, noncontact interaction forces is also particularly appealing in the context of SAWs, where examples of tunable systems are still limited [22,23] with respect to bulk and plate structures [24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Tuning of Surface-Acoustic-Wave Dispersion via Magnetically Modulated Contact Resonances

et al. 2019

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In this work, we propose the use of contact resonances, controlled via an external magnetic field, as a tunable platform to manipulate the dispersion of surface acoustic waves (SAWs). We exploit the analogy between surface acoustic waves in a semi-infinite medium and edge waves in a plate, to realize a compact experimental setup and to demonstrate our tuning strategy. The setup consists of a set of ferromagnetic bead resonators in contact with thin, permanent magnets and positioned at the free edge of an elastic plate. An additional set of magnets, placed at a controlled and variable distance from the beads, is used to alter the contact stiffness and natural frequencies of the bead resonators. We exploit resonances to open large-frequency band gaps via edge-wave hybridization and implement our tuning strategy to shift their frequency ranges. We predict the tuned dispersive properties of hybridized edge waves via numerical models and experimentally reconstruct them via laser vibrometry, finding excellent agreement. The use of magnetic interaction and contact mechanics as a tuning strategy for SAW systems could pave the way toward programmable devices for sensing and electronic components.

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Transversal–rotational and zero group velocity modes in tunable magneto-granular phononic crystals

Cited by 22 publications

References 26 publications

Vibrational dynamics of a two-dimensional microgranular crystal

Vibrational dynamics of a two-dimensional microgranular crystal

Measurement of Rotational Events in Regions Prone to Seismicity: A Review

Tuning of Surface-Acoustic-Wave Dispersion via Magnetically Modulated Contact Resonances

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