Load and stiffness of a planar ferrofluid pocket bearing
Stefan G.E. Lampaert,Jo W. Spronck,R.A.J. van Ostayen +2 more
- Vol. 232, Iss: 1, pp 14-25
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TLDR
In this paper, the authors present a method to model the load carrying capacity and normal stiffness characteristics of a fixed shape of a ferrofluid pocket bearing, based on the geometry of the bearing, the shape of the magnetic field and the magnetization strength of the fluid.Abstract:
A ferrofluid pocket bearings is a type of hydrostatic bearing that uses a ferrofluid seal to encapsulate a pocket of air to carry a load. Their properties, combining a high stiffness with low (viscous) friction and absence of stick-slip, make them interesting for applications that require fast and high precision positioning. Knowledge on the exact performance of these types of bearings is up to now not available. This article presents a method to model the load carrying capacity and normal stiffness characteristics of this type of bearings. Required for this is the geometry of the bearing, the shape of the magnetic field and the magnetization strength of the fluid. This method is experimentally validated and is shown to be correct for describing the load and stiffness characteristics of any fixed shape of ferrofluid pocket bearing.read more
Citations
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Ferrofluid rotary seal with replenishment system for sealing liquids
TL;DR: In this article, a new type of ferrofluid rotary seal is proposed, in which a ferro-fluid replenishment system is implemented that renews the ferfluid in the sealing ring while sealing capacity is maintained.
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Damping performance of a novel ferrofluid dynamic vibration absorber
TL;DR: In this paper, the damping performance of a novel dynamic vibration absorber that exploits the first kind of levitation characteristics of ferrofluid is investigated, and the dependence of the mass of the ferro fluid on the initial eccentricity is investigated in detail.
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Research on the magnetic fluid levitation force received by a permanent magnet suspended in magnetic fluid: Consideration a surface instability
TL;DR: In this paper, the magnetic fluid spikes appearing over the interface between magnetic fluid and air caused by the surface instability of magnetic fluid is taken into consideration, and the dependence between magnet's magnetic fluid levitation force and spikes is studied.
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Rheological texture in a journal bearing with magnetorheological fluids
TL;DR: In this paper, a new type of hybrid journal bearing was proposed in which a magnetorheological fluid is used in combination with local magnetic fields, such that the hydrodynamic and hydrostatic working regimes are not compromised.
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Supporting and friction properties of magnetic fluids bearings
TL;DR: In this paper, a driblet of magnetic fluids (MFs) falls on an annular magnet, forming a closed liquid ring, and the air cushion enclosed by the MFs sealing ring may generate gas support as the magnet bottom combines with a substrate.
References
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Buoyancy and Stable Levitation of a Magnetic Body immersed in a Magnetizable Fluid
TL;DR: In this article, the nature of the peculiar forces experienced by a body immersed in magnetic fluid when the body is a source of magnetic field is discussed and prediction and experimental demonstration are given of the stable "fluidmagnetic" levitation of a permanent magnet at an interior region of the fluid.
Journal ArticleDOI
Static and dynamic characteristics of magnetized journal bearings lubricated with ferrofluid
T.A. Osman,G.S. Nada,Z.S. Safar +2 more
TL;DR: In this article, the static and dynamic characteristics of the hydrodynamic journal bearings lubricated with ferrofluid were investigated. And the critical speed at which whirling motion begins to occur was calculated.
Journal ArticleDOI
Active hydrostatic bearing with magnetorheological fluid
J. Hesselbach,C. Abel-Keilhack +1 more
TL;DR: In this article, the authors present a completely different concept for bearings with magnetorheological fluids and show that the bearing gap varies with the payload, which is the main disadvantage of hydrodynamic bearings.
Journal ArticleDOI
Ferrofluid squeeze film in a long journal bearing
Rajesh C. Shah,M. V. Bhat +1 more
TL;DR: In this paper, a theoretical study and comparison were made of squeeze film behavior in an infinitely long journal bearing using the ferrofluid flow models of Neuringer-Rosensweig, Jenkins and Shliomis with uniform and nonuniform magnetic fields.
Journal ArticleDOI
Hydrodynamic Bearing Lubricated with Magnetic Fluids
TL;DR: In this paper, the work carried out in the development of hydrodynamic lubricated journal bearings with magnetic fluids is summarized, where two different fluids have been analyzed: one is the ferrofluid from FERROTEC APG s10n and the other is the magnetorheological fluid from LORD Corp., MRF122-2ED.