Self-excited and flow-induced vibrations of a rotor supported on journal bearings

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23520%2F19%3A43956656" target="_blank" >RIV/49777513:23520/19:43956656 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Self-excited and flow-induced vibrations of a rotor supported on journal bearings

Popis výsledku v původním jazyce

A rotor supported on hydrodynamic journal bearings represents a complex dynamic system, whose vibrations are significantly influenced by fluid films in the journal bearings. Except for resonant frequencies, dangerous self-excited vibrations of the rotor due to oil-whirl and oil-whip instabilities can occur under certain conditions. Flow-induced vibrations can occur when journal bearings are poorly lubricated. These vibrations are sub-synchronous and they do not pose a danger for the rotor. Self-excited and flow-induced vibrations of the rotor can be predicted using computational models or they can be detected experimentally. Close understanding of behaviour of the journal bearing before, during and after the self-excited and the flow-induced vibrations is the main motivation for the complex research of dynamics and hydrodynamics of the rotor-bearing system. Deep knowledge of relations between the dynamics of a fluid film in journal bearings and the dynamic response of rotating systems of these types of vibration can help to improve designs of many modern rotating machines.

Název v anglickém jazyce

Self-excited and flow-induced vibrations of a rotor supported on journal bearings

Popis výsledku anglicky

A rotor supported on hydrodynamic journal bearings represents a complex dynamic system, whose vibrations are significantly influenced by fluid films in the journal bearings. Except for resonant frequencies, dangerous self-excited vibrations of the rotor due to oil-whirl and oil-whip instabilities can occur under certain conditions. Flow-induced vibrations can occur when journal bearings are poorly lubricated. These vibrations are sub-synchronous and they do not pose a danger for the rotor. Self-excited and flow-induced vibrations of the rotor can be predicted using computational models or they can be detected experimentally. Close understanding of behaviour of the journal bearing before, during and after the self-excited and the flow-induced vibrations is the main motivation for the complex research of dynamics and hydrodynamics of the rotor-bearing system. Deep knowledge of relations between the dynamics of a fluid film in journal bearings and the dynamic response of rotating systems of these types of vibration can help to improve designs of many modern rotating machines.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20302 - Applied mechanics

Projekt

<a href="/cs/project/GA17-15915S" target="_blank" >GA17-15915S: Nelineární dynamika rotujících systémů s uvažováním nestabilit v olejovém filmu s důrazem na lokální jevy</a><br>

Návaznosti

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

Rok uplatnění

2019

Kód důvěrnosti údajů

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