Magnetostatic Analysis of a Pinch Mode Magnetorheological Valve

Gołdasz, Janusz; Sapiński, Bogdan

doi:10.1515/ama-2017-0035

Cited by 17 publications

(19 citation statements)

References 8 publications

(11 reference statements)

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“…The magnetic field density is predicted to increase at the extreme ends of the piston by 2.8 % compared to the original design. Therefore, the corresponding increase in the MR fluid yield stress at shoulders locations is shown to be 5.3 % according to equation (4). The average magnetic field in the MR fluid region is predicted to increase by around 12 %.…”

Section: Effect Of Employing the Mr Fluid Region Inside The Coil Bmentioning

confidence: 91%

“…This leads to an increase of the fluid yield stress at the extreme locations of the piston by 36.1 %. The average magnetic field in the MR fluid region is increased by 16.8 % in the new configuration, according to equation (4). Table 3 shows that the percentage of the increase of magnetic field density at the locations of piston shoulder are around the value of 17 %, except for at = 2.0 A where the value is shown to be 7.6 %.…”

Section: A Effect Of Changing the Magnetic Materialsmentioning

confidence: 93%

“…AGNETORHEOLOGICAL (MR) fluids are smart materials, which are used in applications such as car shock absorbers [1][2][3], hydraulic valves [4], and journal bearings [5]. The massive increase of the viscosity of MR fluids in response to magnetic fields is the key factor of fluid smartness.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Magnetic Circuit Analysis and Fluid Flow Modeling of an MR Damper With Enhanced Magnetic Characteristics

2020

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A novel design of a magnetorheological (MR) damper is developed, fabricated, modelled and tested. The design includes some features that enhance the magnetic characteristics of the damper. The iron-cobalt-vanadium "Vacoflux-50" alloy and the "AMT-Smartec + " MR fluid, whose magnetic characteristics have been predicted to enhance the performance of the damper, are employed in the new design. Moreover, the location of the MR fluid region in the piston construction has been chosen so that the magnetic field maximises. To evaluate the impact of the proposed design improvements, an approach to modelling the performance of a previously-tested MR damper of a different design, different magnetic material, and different MR fluid has been developed. The approach combines a Finite Element Analysis (FEA) of the magnetic circuit, and a nonlinear analytical model of fluid flow. The results of the FE/analytical approach have been validated using the available published results of the same damper. Hence, the approach has been used to predict the performance of the same damper due to the employment of the proposed design improvements. The FE/analytical approach accounts for the nonlinear characteristics caused by the magnetic saturation of materials and the effects of fluid compressibility and aeration in the damper. It has been found that the implementation of the proposed design features leads to a remarkable increase in the magnetic field and the fluid yield stress. Also, the inclusion of the nonlinear magnetic and fluid flow characteristics have been found to affect the magnetic field distribution and the fluid yield stress greatly.

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Section: Effect Of Employing the Mr Fluid Region Inside The Coil Bmentioning

confidence: 91%

Section: A Effect Of Changing the Magnetic Materialsmentioning

confidence: 93%

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Magnetic Circuit Analysis and Fluid Flow Modeling of an MR Damper With Enhanced Magnetic Characteristics

2020

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“…Magnetic circuit of new type of MRFs was designed by magnetostatic model, the circuit arrangement is based on gradient-pinch mode of MR fluid which published (Goncalves and Carlson, 2009) or (Gołdasz and Sapiński, 2017). Design of gradient-pinch MRFs is composed of two pole pieces, electromagnetic coil, MR fluid and nonmagnetic shaft with diameter 18 mm, see Fig.…”

Section: New Type Of Magnetorheological Fluid Sealmentioning

confidence: 99%

Magnetorheological fluid seal with minimum friction torque

2018

Engineering Mechanics

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The paper deals with design and tests of MagnetoRheological Fluid seal (MRFs) using innovative conception of magnetic circuit. The common design of magnetic seal uses ferrofluid. Low friction torque and low burst pressure are typical for this kind of seals. Replacement of the ferrofluid by magnetorheological fluid increases the burst pressure; however, the friction torque increase too. The optimum for sealing is low friction torque and high burst pressure. The new design of MRFs described in this paper meets both requirements; is based on gradient-pinch mode. The friction torque and burst pressure of this type of design and common design of MRFs were tested and compared. The new design of MRFs achieved 20 times lower friction torque that current solution MRFs. The developed MRFs combines the benefits of common FFs and MRFs.

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“…The characteristics of flow in MR fluid devices may be represented by a single or dual modes. Examples of devices that adopt the flow (valve) mode include: MR actuators, linear MR dampers and hydraulic valves (Chooi and Oyadiji, 2009; Gołdasz and Sapiński, 2017; Hu et al, 2009; Liao and Lai, 2002; Metered, 2010; Oyadiji and Sarafianos, 2003; Wang et al, 2009b). Linear MR dampers also involve flow in shear mode due to the piston motion.…”

Section: Introductionmentioning

confidence: 99%

A review on multi-physics numerical modelling in different applications of magnetorheological fluids

Elsaady

Oyadiji

Nasser

2020

Journal of Intelligent Material Systems and Structures

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Magnetorheological fluids involve multi-physics phenomena which are manifested by interactions between structural mechanics, electromagnetism and rheological fluid flow. In comparison with analytical models, numerical models employed for magnetorheological fluid applications are thought to be more advantageous, as they can predict more phenomena, more parameters of design, and involve fewer model assumptions. On that basis, the state-of-the-art numerical methods that investigate the multi-physics behaviour of magnetorheological fluids in different applications are reviewed in this article. Theories, characteristics, limitations and considerations employed in numerical models are discussed. Modelling of magnetic field has been found to be rather an uncomplicated affair in comparison to modelling of fluid flow field which is rather complicated. This is because, the former involves essentially one phenomenon/mechanism, whereas the latter involves a plethora of phenomena/mechanisms such as laminar versus turbulent rheological flow, incompressible versus compressible flow, and single- versus two-phase flow. Moreover, some models are shown to be still incapable of predicting the rheological nonlinear behaviour of magnetorheological fluids although they can predict the dynamic characteristics of the system.

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Magnetostatic Analysis of a Pinch Mode Magnetorheological Valve

Cited by 17 publications

References 8 publications

Magnetic Circuit Analysis and Fluid Flow Modeling of an MR Damper With Enhanced Magnetic Characteristics

Magnetic Circuit Analysis and Fluid Flow Modeling of an MR Damper With Enhanced Magnetic Characteristics

Magnetorheological fluid seal with minimum friction torque

A review on multi-physics numerical modelling in different applications of magnetorheological fluids

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