Acoustic behavior of magnetorheological fluids in magnetic fields

Howarth, Thomaś R.; Fratantonio, Frank; Boisvert, Jeffrey E.; Bruno, Anthony B.; Scandrett, Clyde L.; Wynn, W. M.; Davis, Paul

doi:10.1121/1.3654452

Cited by 3 publications

(3 citation statements)

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“…which considers the coupling interaction of ferro particle skeletal frame to the base fluid. The other researchers [4][5][6][7] In this study, we will treat only the first kind of longitudinal wave. Let u is displacement of the frame, U is displacement of the pore fluid relative to the frame.…”

Section: Introductionmentioning

confidence: 99%

Acoustic velocity and attenuation coefficient of magnetorheological fluids under electromagnetic fields

Shen

Huang

2016

Applied Acoustics

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Magnetorheological fluid (MRF) is a class of smart material whose acoustic properties can be varied rapidly and reversibly by the applied magnetic field. The MRF is proposed to be as actively sound barriers or acoustical metamaterial. This paper presents a theoretical model to study acoustic propagation in MRF under fields based on the Biot-Stoll model.The model considers the coupling interaction between ferro particle and base fluid. This paper investigated the acoustic velocity and attenuation of a commercial MRF dependence on the different parameters such as carrier fluid viscosity, permeability and intensity of magnetic field. The calculated results show that the attenuation is increased with small field strengths and independent on field strength when the magnetization begins to saturate.

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Section: Introductionmentioning

confidence: 99%

Acoustic velocity and attenuation coefficient of magnetorheological fluids under electromagnetic fields

Shen

Huang

2016

Applied Acoustics

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“…In their study, the theoretical model of acoustic wave propagation in MRF is based on one dimensional wave equation in the elastic medium. Howarth et al [4] conducted a series of acoustic experiments at the National High Magnetic Field Laboratory in Tallahassee, Florida. The acoustic sound speed of MR fluids was measured as functions of applied magnetic field strength, normal and orthogonal field orientations, and acoustic frequency.…”

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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“…Recently, active magnetorheological fluids were proposed to be used for acoustic metamaterials as well. 19 Our approach for active adaptive control is fundamentally different utilizing the interaction of applied magnetic field with electrically charged nano or micro particles constituting the metamaterial lattice. The particles are attached to compliant layers, therefore, the designed structure exhibits two resonances: mechanical spring-mass resonance and electro-magnetic cyclotron resonance.…”

Section: Introductionmentioning

confidence: 99%

Electro-magnetically controlled acoustic metamaterials with adaptive properties

Malinovsky

Donskoy

2012

The Journal of the Acoustical Society of America

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A design of actively controlled metamaterial is proposed and discussed. The metamaterial consists of layers of electrically charged nano or micro particles exposed to external magnetic field. The particles are also attached to compliant layers in a way that the designed structure exhibits two resonances: mechanical spring-mass resonance and electro-magnetic cyclotron resonance. It is shown that if the cyclotron frequency is greater than the mechanical resonance frequency, the designed structure could be highly attenuative (40-60 dB) for vibration and sound waves in very broad frequency range even for wavelength much greater than the thickness of the metamaterial. The approach opens up wide range of opportunities for design of adaptively controlled acoustic metamaterials by controlling magnetic field and/or electrical charges.

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Acoustic behavior of magnetorheological fluids in magnetic fields

Cited by 3 publications

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Acoustic velocity and attenuation coefficient of magnetorheological fluids under electromagnetic fields

Acoustic velocity and attenuation coefficient of magnetorheological fluids under electromagnetic fields

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

Electro-magnetically controlled acoustic metamaterials with adaptive properties

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