The mathematical modelling of nonlinear vibration of rotors influenced by magnetic and electric effects

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F17%3A00483818" target="_blank" >RIV/61388998:_____/17:00483818 - 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

The mathematical modelling of nonlinear vibration of rotors influenced by magnetic and electric effects

Popis výsledku v původním jazyce

The main parts of magnetorheological squeeze film dampers are two concentric rings separated by a gap filled with magnetorheological oil. Squeezing the oil film due to the rotor vibration produces the damping force. The magnetic flux generated in coils embedded in the damper housing passes through the lubricant and as its flow resistance depends on magnetic induction the change of the applied current can be used to control the damping force. The variation of the width of the damper gap changes the magnetic flux, which induces the electromotoric voltage and consequently reduces the applied current. As a result, the rotor vibration attenuation depends on a complex interaction between mutually coupled mechanical, hydraulic, magnetic, and electric transient phenomena. In the developed mathematical model the magnetorheological oil is represented by a bilinear material and the damper body by a set of meridian segments. Each segment is considered to be a divided core of an electromagnet with the gap filled with the magnetorheological oil. The pressure distribution in the lubricating film is governed by the Reynolds equation adapted to bilinear material. The goal of the carried out investigations was to learn more on nonlinear effects and a complex influence of the electromagnetic phenomena occurring in magnetorheological damping devices on the vibration attenuation of rotors.

Název v anglickém jazyce

The mathematical modelling of nonlinear vibration of rotors influenced by magnetic and electric effects

Popis výsledku anglicky

The main parts of magnetorheological squeeze film dampers are two concentric rings separated by a gap filled with magnetorheological oil. Squeezing the oil film due to the rotor vibration produces the damping force. The magnetic flux generated in coils embedded in the damper housing passes through the lubricant and as its flow resistance depends on magnetic induction the change of the applied current can be used to control the damping force. The variation of the width of the damper gap changes the magnetic flux, which induces the electromotoric voltage and consequently reduces the applied current. As a result, the rotor vibration attenuation depends on a complex interaction between mutually coupled mechanical, hydraulic, magnetic, and electric transient phenomena. In the developed mathematical model the magnetorheological oil is represented by a bilinear material and the damper body by a set of meridian segments. Each segment is considered to be a divided core of an electromagnet with the gap filled with the magnetorheological oil. The pressure distribution in the lubricating film is governed by the Reynolds equation adapted to bilinear material. The goal of the carried out investigations was to learn more on nonlinear effects and a complex influence of the electromagnetic phenomena occurring in magnetorheological damping devices on the vibration attenuation of rotors.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20302 - Applied mechanics

Projekt

<a href="/cs/project/GA15-06621S" target="_blank" >GA15-06621S: Modelování inteligentních tlumicích prvků rotujících soustav využívajících fyzikálních vlastností magnetoreologických kapalin</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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