Stability and Flow Behavior of a Magnetorheological Lubricant in a Magnetic Shock Absorber

Durán, J.D.G.; Iglesias, Guillermo R.; Delgado, A.V.; Ruiz-Morón, L Fernández; Insa, J.; González‐Caballero, F.

doi:10.1080/10402000701793963

Cited by 17 publications

(11 citation statements)

References 8 publications

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“…MR fluid can be synthesized using carbonyl iron (CI) particles (diameter 3-10 μm, 20-40 per cent by volume), additives and base oil (Lord Corporation, 2014; Duran et al , 2008; Song et al , 2011; Seok et al , 2009). To observe the effect of volume percentage of MR particle, MR fluids with 6, 9, 13 and 36 per cent volume were synthesized and characterized for yield stress on the ANTON PAAR MCR-102 magneto-rheometer at 100 s −1 shear rate.…”

Section: Synthesis Of Mr Fluidmentioning

confidence: 99%

Experimental studies on magnetorheological brake containing plane, holed and slotted discs

Sarkar

Hirani

2017

ILT

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Purpose This study aims to design an ideal magnetorheological (MR) brake that exerts negligible frictional torque in the off-state condition and controllable frictional torque in the on-state condition. Design/methodology/approach Silicone-based MR fluid, containing 9 per cent volume carbonyl iron particles, has been synthesized and used. The synthesized MR fluid is advantageous in maintaining low friction losses in off-state conditions. A magneto-rheometer has been utilized to characterize the off-state viscosity of the MR fluid at variable shear rates and shear stress of MR fluids at various magnetic fields. A mechanism to enhance the braking torque in the on-state condition has been designed and developed. An experimental test rig has been developed to capture the torque characteristics of the developed MR brakes. Three different designs of MR discs have been experimented under a magnetic field varying from 0 to 375 kA/m. Experimental results of braking torque under shear and compression modes have been presented. Findings Slotted disc MR brake gives much better torque performance. Originality/value The braking torque results motivate to use the slotted disc MR brake for high torque application.

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Section: Synthesis Of Mr Fluidmentioning

confidence: 99%

Experimental studies on magnetorheological brake containing plane, holed and slotted discs

Sarkar

Hirani

2017

ILT

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“…The use of MR fluids in various applications, such as dampers (Zhang et al (1), Durán et al (2)), brakes (Hung and Bok (3)) and surface finishing (Seok et al (4)) where control of friction and vibrations becomes a useful capability, stimulated research concerning the field of journal bearing lubrication (Hesselbach and Abel-Keilhack (5), Urreta et al (6)). While the MR fluids offer high yield stress and thus controllability, certain limitations, such as sedimentation of the iron based particles of the MR fluids, have motivated some research towards the use of NMR fluids (Lin et al (7)).…”

Section: Introductionmentioning

confidence: 98%

Rotordynamic Analysis of a Shaft Using Magnetorheological and Nanomagnetorheological Fluid Journal Bearings

Bompos

Nikolakopoulos

2016

Tribology Transactions

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The rotordynamic behavior of a system supported by journal bearings is critical to its reliability.A suitable method of control of the orbital motion of a shaft in a journal bearing is the use of smart lubricants, in effect fluids with controllable physical properties. There are various categories of smart lubricants. One class of smart lubricants, the magnetorheological fluids, are produced as a dispersion of magnetic particles in a carrier fluid which is usually a conventional lubricant. These particles form chains under the influence of a magnetic field, which hinder the lubricant flow, thus changing its apparent viscosity. Magnetorheological (MR) fluids exhibit high yield stress, low delay of response and relatively low friction while not in their active state.A subcategory of MRF's, the nanomagnetorheological (NMR) fluids with particle size in the nanometer scale, exhibit lower yield stress than the MRF's but, on the other hand, display high viscosity. The effect of the MRF's and NMRF's on the rotordynamic behavior of a shaft is calculated through a combined finite element and computational fluid dynamics analysis. While the MR fluid with the specific geometrical configuration of the bearing is not sufficiently activated and therefore does not improve the performance of the magnetorheological journal Downloaded by [New York University] at 19:53 15 June 2015 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 2 bearing, the NMR fluid has the ability of limiting up to 82% the amplitude of the vibrations of the shaft.

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“…From this deliberation, it can be inferred that MR applications incorporating mechanical stirring (such as brakes, clutches) may use larger sized particles. To create complete chaining mechanism of MR fluids, the volume fractions of iron particles should be in between 20% -40% [11][12][13][14]. To explore the effect of particle sizes, nine MR fluids containing 9%, 18% and 36% by volume carbonyl iron (CI) small, large and mixed sized particles have been synthesized.…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Size on Shear Stress of Magnetorheological Fluids

Sarkar

Hirani

2015

Smart Science

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Smart Science 65 Particle size distributionAs per Lemaire et al.[4] small sized particle means diameter = 0.5 µm and large sized particle means diameter = 1.0 µm. As per Kittipoomwong and Klingenberg [5], the larger size means two times the size of smaller size particle. Chiriac and Stoian [6] termed particle lesser than 20µm as smaller sized particle, while particles in the range of 50 to 63 µm were named as larger sized particles. This review of literature intimates the subjective nature of term "larger sized" and "smaller sized" particles. In the present case, two commercial carbonyl iron powders; and product no. 12310 and 44890 from Sigma Aldrich, were purchased. The product no. 12310 contains approximately 10% in the range 150µm -212µm, 65 -85% in the range of 45µm -150µm. Therefore the Product No. 12310 is named as "large sized particles". The particle size distribution in product No.

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Stability and Flow Behavior of a Magnetorheological Lubricant in a Magnetic Shock Absorber

Cited by 17 publications

References 8 publications

Experimental studies on magnetorheological brake containing plane, holed and slotted discs

Experimental studies on magnetorheological brake containing plane, holed and slotted discs

Rotordynamic Analysis of a Shaft Using Magnetorheological and Nanomagnetorheological Fluid Journal Bearings

Effect of Particle Size on Shear Stress of Magnetorheological Fluids

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