Nano-micro composite magnetic fluids: Magnetic and magnetorheological evaluation for rotating seal and vibration damper applications

Marinică, Oana; Susan-Resiga, Daniela; Bălănean, Florica; Vizman, Daniel; Socoliuc, Vlad; Vékás, L.

doi:10.1016/j.jmmm.2015.12.095

Cited by 37 publications

(20 citation statements)

References 27 publications

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“…The yielding shear stress of the magnetorheological fluid, needed for solving the pressure gradient in the region outside the core (11) depends on magnetic induction. Based on the measurements, dependence of the yielding shear stress on magnetic induction can be approximated by a power function [19] (13) B is the magnetic induction, and k y , n y are the proportional and exponential material constants of the magnetorheological fluid, respectively.…”

Section: Pressure Distribution In the Classical And Magnetorheologicamentioning

confidence: 99%

Numerical computation of the damping and stiffness coefficients of the classical and magnetorheological squeeze film damper

et al. 2018

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Technological solution, frequently used to suppress vibrations in rotating machines, consists in adding damping devices between the rotor and its frame. This is enabled by dampers working on the principle of a squeezing thin classical or magnetorheological fluid film. The Navier-Stokes equations, Reynolds equation, and modified Navier-Stokes equations are used to determine the pressure distribution in the thin fluid film. The damping and stiffness coefficients are computed by the developed procedure presented in this paper. The proposed computational approach is based on the perturbation of the synchronous circular whirling motion. The carried-out computational simulations show that the investigated mathematical models of the squeeze film damper and magnetorheological squeeze film damper allowed computation of the damping and stiffness coefficients. It has been found that the stiffness coefficients computed by the proposed mathematical models may be different.

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Section: Pressure Distribution In the Classical And Magnetorheologicamentioning

confidence: 99%

Numerical computation of the damping and stiffness coefficients of the classical and magnetorheological squeeze film damper

et al. 2018

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“…Wang 10 observed that MgFe 2 O 4 nanocrystal clusters were regarded as promising candidates for MRF with an enhanced sedimentation stability. Certain scholars were used to modify the particle surface, [11][12][13][14][15][16] select a di®erent carrier, 3,17,18 add di®erent surfactants [19][20][21][22][23] and many other methods to improve the MRF properties. In the aforementioned studies, the settling stability of MRFs to various degrees was optimized, whereas in certain cases, at the expense of reducing the shear yield strength, increasing the¯eld viscosity or increasing the preparation duration and cost.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nano-Diamond on Magnetorheological Fluid Properties

Zhao

Zhang

Yao

et al. 2017

NANO

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In order to analyze the e®ects of nano-diamond on the performance of magnetorheological°uids (MRFs), in this paper, the MRF-1 with a 2% mass fraction in nano-diamond and the MRF-2 without nano-diamond were prepared by the carbonyl iron powder as the dispersed phase and the synthetic mineral oil as the continuous phase. The viscosity and shear stress of MRFs under di®erent magnetic¯elds were measured by the Anton-Paar rheometer (MCR 302). The MRF settling stability was studied by a standing observation method. A four-ball wear machine was utilized for the wear test at 0.1 T of magnetic¯eld, whereas the magnetic¯eld was provided by an external coil. Also, the three-dimensional white light interferometer was utilized to observe the surface of the ball wear spot, in order to determine the MRF friction properties. The results demonstrated that the nano-diamond had a signi¯cant increase in the surface wear. The shear yield strength and settling stability of the MRF could be highly enhanced. The higher the strength of the magnetic¯eld was, the higher the di®erence in the shear yield strength was. These phenomena demonstrated that the physical properties of the nano-diamond could have a higher impact on MRF, which was of high signi¯cance to the preparation of MRFs with excellent performance.

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“…Being a functional material with both magnetic properties of solid magnetic materials and fluidity of liquids, magnetic fluids have been widely used in a large variety of engineering and biomedical applications, such as vacuum sealing, bearings, lubrication, and insulation [1][2][3]. Marinica et al [4] studied the static properties and magnetorheological behavior of a set of 12 nano-micro composite magnetic fluids for rotation seal and vibration damper applications. An Mn-Zn ferrite magnetic fluid (TCF-56) has been investigated as a coolant in a 3 kW prototype transformer for overloading conditions by Patel et al [5].…”

Section: Introductionmentioning

confidence: 99%

Damping Force Modeling and Suppression of Self-Excited Vibration due to Magnetic Fluids Applied in the Torque Motor of a Hydraulic Servovalve

Zhang

Peng

2017

Energies

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Abstract:As a key component of hydraulic control systems, hydraulic servovalves influence their performance significantly. Unpredictable self-excited noise inside hydraulic servovalves may cause instability and even failure. Being functional, with higher saturation magnetization and increased viscosity when exposed to a magnetic field, magnetic fluids (MFs) have been widely used in dampers, sealing, and biomedical treatment. In this paper, magnetic fluids are applied in the torque motor of a hydraulic servovalve to exert damping and resistance for vibration and noise suppression. Construction of the torque motor armature with magnetic fluids is introduced and the forces due to magnetic fluids on the torque motor armature are studied. Based on a bi-viscosity-constituted relationship, a mathematical model of the damping force from magnetic fluids is built when magnetic fluids are filled in the working gaps of the torque motor. Measurements of the properties of an Fe 3 O 4 composite magnetic fluid are carried out to calculate the parameters of this mathematical model and to investigate the influence of magnetic fluids on the vibration characteristics of the armature assembly. The simulated and tested harmonic responses of the armature with and without magnetic fluids show the good suppression effects of magnetic fluids on the self-excited noise inside the servovalve.

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Nano-micro composite magnetic fluids: Magnetic and magnetorheological evaluation for rotating seal and vibration damper applications

Cited by 37 publications

References 27 publications

Numerical computation of the damping and stiffness coefficients of the classical and magnetorheological squeeze film damper

Numerical computation of the damping and stiffness coefficients of the classical and magnetorheological squeeze film damper

Effects of Nano-Diamond on Magnetorheological Fluid Properties

Damping Force Modeling and Suppression of Self-Excited Vibration due to Magnetic Fluids Applied in the Torque Motor of a Hydraulic Servovalve

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