Analysis of influence of short magnetorheological damping elements on vibrations attenuation of rigid rotors

Kód výsledku v IS VaVaI

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Nalezeny alternativní kódy

RIV/61388998:_____/15:00451913 RIV/61989100:27740/15:86094845

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Analysis of influence of short magnetorheological damping elements on vibrations attenuation of rigid rotors

Popis výsledku v původním jazyce

A frequently used technological solution for reducing lateral vibrations of rotating machines as a result of their unbalance consists in adding damping devices to the rotor supports. To achieve their optimum performance their damping effect must be adaptable to the current operating conditions. This is offered by magnetorheological squeeze film dampers. Magnetorheological oils belong to the class of liquids with a yielding shear stress. In the developed mathematical model of a short magnetorheological squeeze film damper the lubricant is represented by Bingham material. Then the pressure distribution in the lubricating layer is governed by the Reynolds equation adapted for Bingham fluid. The yielding shear stress depends on magnetic induction. Its stationary value can be approximated by a power function and its dependence on its time history in the past (characterized by a time constant) by a convolution integral that is consequently transformed to a linear differential equation of the

Název v anglickém jazyce

Analysis of influence of short magnetorheological damping elements on vibrations attenuation of rigid rotors

Popis výsledku anglicky

A frequently used technological solution for reducing lateral vibrations of rotating machines as a result of their unbalance consists in adding damping devices to the rotor supports. To achieve their optimum performance their damping effect must be adaptable to the current operating conditions. This is offered by magnetorheological squeeze film dampers. Magnetorheological oils belong to the class of liquids with a yielding shear stress. In the developed mathematical model of a short magnetorheological squeeze film damper the lubricant is represented by Bingham material. Then the pressure distribution in the lubricating layer is governed by the Reynolds equation adapted for Bingham fluid. The yielding shear stress depends on magnetic induction. Its stationary value can be approximated by a power function and its dependence on its time history in the past (characterized by a time constant) by a convolution integral that is consequently transformed to a linear differential equation of the

Druh

D - Stať ve sborníku

CEP obor

JR - Ostatní strojírenství

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2015

Kód důvěrnosti údajů

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

Název statě ve sborníku

COMPDYN 2015: Computational Methods in Structural Dynamics and Earthquake Engineerin. Volume 1 + 2

ISBN

978-960-99994-7-2

ISSN

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e-ISSN

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Počet stran výsledku

8

Strana od-do

1941-1948

Název nakladatele

National Technical University of Athens

Místo vydání

Atheny

Místo konání akce

Hersonissos, Kréta

Datum konání akce

25. 5. 2015

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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