Electro-magnetically controlled acoustic metamaterials with adaptive properties

Malinovsky, Vladimir S.; Donskoy, Dimitri

doi:10.1121/1.4744943

Cited by 17 publications

(7 citation statements)

References 20 publications

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“…More specifically, modifying the contrast in material parameters of a crystal, or changing the physical arrangement of components, manifests in the transmission spectrum and band structure to show the effects on transient sound. Active sonic structures with applied static electric fields, [14][15][16] magnetically, [17][18][19] mechanically 20,21 and recently with infrared radiation 22 have been reported. Most of these active sonic structures are in physical contact with the actuating source.…”

Section: Introductionmentioning

confidence: 99%

Radio-frequency actuated polymer-based phononic meta-materials for control of ultrasonic waves

Walker

Wang²,

Neogi

2017

NPG Asia Mater

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Radio-frequency (RF) control of an ultrasonic phononic crystal was achieved by encapsulating it in a composite of high k-10% KF-doped BaTiO 3 dielectric nanoparticles with poly(N-isopropylacrylamide) (PNIPAm)-based hydrogel. The combination of the nanoparticles and hydrogel produced a composite with elastic properties susceptible to RF actuation. The novel acoustic meta-material enables the regulation of sound waves by electromagnetic waves, which is not possible in a conventional medium as elasto-mechanical waves, and electromagnetic waves do not directly couple. Compared with light waves, radio waves can penetrate deeper into bulk structures and enable the control of propagation of ultrasonic waves through a macroscale phononic crystal. An RF antenna emitting at 318.6 and 422.5 kHz was used to modulate the device in water and ambient air, respectively. An increased transparency of the ultrasonic wave in the material was observed due to an increase in the bandwidth of the modulated device exceeding 8 kHz with a 30-fold increase in the signal modulation at select frequencies. The radio waves induced changes in the transmission and demonstrated the control of ultrasound with applied RF. The synthetic acoustic properties in the resultant meta-material device were actively manipulated through the interaction of electromagnetic waves with the material.

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Section: Introductionmentioning

confidence: 99%

Radio-frequency actuated polymer-based phononic meta-materials for control of ultrasonic waves

Walker

Wang²,

Neogi

2017

NPG Asia Mater

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“…Then, people turn their attention to other control methods based on the active characteristics. There have been several studies about the active control on elastic wave in phononic crystals (Asiri et al, 2006;Chen et al, 2012;Malinovsky and Donskoy, 2012). However, this field has not received enough attention and only a few investigations have been reported, which do not mainly show the features of active feedback control and more researches are expected.…”

Section: Introductionmentioning

confidence: 99%

Active feedback control of elastic wave metamaterials

Wang

2017

Journal of Intelligent Material Systems and Structures

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As an important extension of periodic structures and phononic crystals, elastic wave/acoustic metamaterials can show negative effective parameters for special frequency regions. Although the active control method is widely applied to the vibration isolation and elastic wave propagation, little attention has been paid on changing elastic wave/acoustic properties of metamaterials. In this work, a new kind of elastic wave metamaterials combined with the automatic control system is presented. Propagation behaviors of the elastic wave are discussed. To demonstrate the effect of the active feedback control, the stop band properties, tunable negative effective mass and control system stability are considered. The results show that the negative acceleration feedback control can enhance the frequency region that creates the negative effective mass. Moreover, the stability of this periodic structure can be achieved.

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“…However, if the magnetic field is removed, the suspension turns to a Newtonian fluid and the transition between these two phases is highly reversible, which provides a unique feature of electric-or magnetic-field controllability of acoustic impedance of MRF. This feature has inspired the design of new active sound barriers to control noise transmission loss or as acoustic metamaterials with negative effective dynamic bulk modulus [2][3]. Since the discovery of the magnetorheology, only a few works have been published in acoustic properties of the MRF.…”

Section: Introductionmentioning

confidence: 99%

“…Since the discovery of the magnetorheology, only a few works have been published in acoustic properties of the MRF. Malinovsky et al [2][3] designed actively electro-magnetically controlled acoustic metamaterial. They construct negative mass employs mass-spring oscillator build into another mass.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Velocity and Attenuation in Magnetorhelogical fluids based on an effective density fluid model

Shen

Huang

2016

MATEC Web of Conferences

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Abstract. Magnetrohelogical fluids (MRFs) represent a class of smart materials whose rheological properties change in response to the magnetic field, which resulting in the drastic change of the acoustic impedance. This paper presents an acoustic propagation model that approximates a fluid-saturated porous medium as a fluid with a bulk modulus and effective density (EDFM) to study the acoustic propagation in the MRF materials under magnetic field. The effective density fluid model derived from the Biot's theory. Some minor changes to the theory had to be applied, modeling both fluid-like and solid-like state of the MRF material. The attenuation and velocity variation of the MRF are numerical calculated. The calculated results show that for the MRF material the attenuation and velocity predicted with this effective density fluid model are close agreement with the previous predictions by Biot's theory. We demonstrate that for the MRF material acoustic prediction the effective density fluid model is an accurate alternative to full Biot's theory and is much simpler to implement.

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Electro-magnetically controlled acoustic metamaterials with adaptive properties

Cited by 17 publications

References 20 publications

Radio-frequency actuated polymer-based phononic meta-materials for control of ultrasonic waves

Radio-frequency actuated polymer-based phononic meta-materials for control of ultrasonic waves

Active feedback control of elastic wave metamaterials

Acoustic Velocity and Attenuation in Magnetorhelogical fluids based on an effective density fluid model

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