The influence of ferromagnetic fluids on performance of hydrodynamic bearings

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989100%3A27230%2F19%3A10243603" target="_blank" >RIV/61989100:27230/19:10243603 - isvavai.cz</a>

Alternative codes found

RIV/61989100:27740/19:10243603

Result on the web

<a href="https://www.jvejournals.com/article/20950" target="_blank" >https://www.jvejournals.com/article/20950</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.21595/vp.2019.20950" target="_blank" >10.21595/vp.2019.20950</a>

Result language

angličtina

Original language name

The influence of ferromagnetic fluids on performance of hydrodynamic bearings

Original language description

The rotors are often mounted in hydrodynamic bearings. To achieve their optimum performance in a wide range of operating speeds, their stiffness and damping parameters must be adaptable to the current angular velocity. This is offered by application of smart fluids sensitive to a magnetic field. The detailed analysis shows that application of ferromagnetic fluids is possible only for small sliding bearings. For bearings, the operation of which requires to generate high pressure, this concept fails. This arrived at the idea to use the ferrofluids-based magnetorheological fluids as a lubricant. This paper deals with the development of a basic concept of such a bearing and with the principle considerations on the magnetic flux generation and its propagation in the bearing housing and the lubricating layer. The developed mathematical model of the bearing was applied for investigation of the influence of changes of the lubricant properties by means of a magnetic field on the vibration attenuation of a rigid rotor excited by unbalance. The pressure distribution in the bearing gap is governed by the Reynolds equation adapted to non-Newtonian lubricant, the yielding shear stress of which depends of magnetic induction. The magnetic flux propagation in the bearing housing is described by the Hopkinson law. The results of the simulations show that the increase of the yielding shear stress of the lubricant by action of a magnetic field rises the bearing load capacity and does not destabilize the rotor vibration. (C) 2019 Jaroslav Zapoměl, et al.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20301 - Mechanical engineering

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Vibroengineering Procedia

ISBN

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ISSN

2345-0533

e-ISSN

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Number of pages

6

Pages from-to

133-138

Publisher name

JVE International

Place of publication

Kaunas

Event location

Leipzig, Germany

Event date

Sep 30, 2019

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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