A study of magnetic fluid seals for underwater robotic vehicles

Kim, Dae-Young; Bae, Hyung-Sub; Park, Myeong-Kwan; Yu, Son-Cheol; Yun, Young-Sool; Cho, C. Peter; Yamane, Ryuichiro

doi:10.3233/jae-2010-1195

Cited by 22 publications

(14 citation statements)

References 3 publications

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“…At present, lots of research studies focus on OMS with less than 0.4 mm small clearance. Urreta and Mkubik et al analyzed the sealing effect of two kinds of magnetofluid with different particle sizes to improve the pressure ability and to reduce friction torque and apply them to the spindle of high-precision machine tool [6,7]. Zhang et al studied and analyzed the influence of volume fraction of magnetofluid, magnetic field parameters, geometrical parameters, and different ester magnetofluids on the sealing ability of OMS [8].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Circuit Design and Magnetic Field Finite Element Analysis of Converging Stepped Magnetofluid Seal with Small Clearance

Yang

Zhang

2020

Advances in Materials Science and Engineering

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The stepped magnetofluid seal is an effective method for improving the pressure ability of ordinary magnetofluid seals (OMS) with large clearance. At present, the research on stepped magnetofluid seal with less than 0.4 mm small clearance has not been carried out yet. The equivalent magnetic circuit design of converging stepped magnetofluid seal (CSMS) with small clearance has been carried out and verified by magnetic field finite element method based on the CSMS theory and magnetic circuit theory. The effects of the width of the axial seal position, the height of the radial seal position, the number of the pole tooth in the axial seal position, and the number of the pole tooth in the radial seal position on the theoretical pressure ability of the CSMS are investigated by numerical simulation. The calculation results are analyzed and discussed. The results show that the magnetic flux leakage at the junction of the permanent magnet and pole piece causes the higher pressure ability of the CSMS structure designed by the equivalent magnetic circuit method than that calculated by the magnetic field finite element method. When the width of the axial seal position is greater than the height of the radial seal position and the number of pole teeth in the axial seal position is less than the number of pole teeth in the radial seal position, the CSMS has the best effect. Compared with OMS with small clearance, CSMS has greater advantages.

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Section: Introductionmentioning

confidence: 99%

Magnetic Circuit Design and Magnetic Field Finite Element Analysis of Converging Stepped Magnetofluid Seal with Small Clearance

Yang

Zhang

2020

Advances in Materials Science and Engineering

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“…Zhou et al (2016) experimentally studied the lubrication characteristics of the ferrofluid film in a spiral groove mechanical sea, and revealed that the hydrodynamic pressure increases with the increasing magnetic field intensity. The viscosity of lubricant film has a very important influence on the performance and leakage rate in a non-contacting mechanical seal (Kim et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

On hydrodynamic lubrication characteristics of ferrofluid film in a spiral groove mechanical seal

Zhang

Zhou

et al. 2018

ILT

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Purpose The purpose of this study is to investigate the hydrodynamic lubrication characteristics of ferrofluid film for spiral groove mechanical seal in external electromagnetic field and to analyze the effects of the volume fraction of ferrofluid, parameters of the electromagnetic field, operating parameters and geometrical parameters of mechanical seal on the characteristics of ferrofluid film. Design/methodology/approach The relationship between the ferrofluid viscosity and the intensity of external electromagnetic field was established. Based on the Muijderman narrow groove theory, the pressure distribution was calculated with the trial method by trapezoid formula. Findings It was found that pressure, average viscosity, average density and opening force of ferrofluid between end faces increase with the increase in intensity of current, volume fraction of ferrofluid, rotating speed, pressure differential and spiral angle; decrease with the increase in temperature; and increase at first and then decrease with the increase in the ratio of groove width to weir and the groove length. All of them reach the maximum value when the ratio of width of groove to weir is 0.7 and the ratio of groove length is 0.6. Leakage of ferrofluid increases with an increase in intensity of current, volume fraction of ferrofluid, rotating speed, pressure differential, spiral angle and ratio of groove length; decreases with an increase in temperature; and increases at first and then decreases with the increase in the ratio of groove width to weir. The tendencies of characteristics of silicone oil are consistent with those of ferrofluid, and the characteristics of silicone oil are smaller than those of ferrofluid under the same condition. Originality/value The volume fraction of ferrofluid, rotating speed, spiral angle, ratio of groove width to weir, groove length and temperature have a significant influence on the characteristics of ferrofluid film; however, intensity of current and the pressure differential have slight influence on the characteristics of ferrofluid film. An analytical method for analyzing hydrodynamic lubrication characteristics of ferrofluid film in a spiral groove mechanical seal was proposed based on the Muijderman narrow groove theory.

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“…This combination of fluidic and magnetic properties of the ferrofluid is exploited in many innovative engineering devices. Examples of ferrofluid-based devices are seals for underwater robotic vehicles [1] and rotary blood pumps [2], also sensors for acceleration [3,4], pressure [5] and fluid flow [6].…”

Section: Introductionmentioning

confidence: 99%

Study of the magnetic force delivered by an actuator with nonlinear ferrofluid and permanent magnets

Olaru

Arcire

Petrescu

et al. 2016

IEEJ Transactions Elec Engng

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The main purpose of the paper is to calculate the magnetic force delivered by actuators with a nonmagnetic body levitated in a ferrofluid that is magnetized by permanent magnets. A linear algebraic formula is proposed for this purpose, which is then validated experimentally. The nonlinear magnetization curve for the ferrofluid, known in detail, was used in computations. Satisfactory agreement between the results obtained with the linear formula for the force and the experimental results was obtained. The expression for the force is very simple, having only three independent variables, and can be used as a "guideline" in the analysis and design of the mentioned actuators.

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A study of magnetic fluid seals for underwater robotic vehicles

Cited by 22 publications

References 3 publications

Magnetic Circuit Design and Magnetic Field Finite Element Analysis of Converging Stepped Magnetofluid Seal with Small Clearance

Magnetic Circuit Design and Magnetic Field Finite Element Analysis of Converging Stepped Magnetofluid Seal with Small Clearance

On hydrodynamic lubrication characteristics of ferrofluid film in a spiral groove mechanical seal

Study of the magnetic force delivered by an actuator with nonlinear ferrofluid and permanent magnets

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