The mathematical modelling of nonlinear vibration of rotors influenced by magnetic and electric effects
The result's identifiers
Result code in 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>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
The mathematical modelling of nonlinear vibration of rotors influenced by magnetic and electric effects
Original language description
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.
Czech name
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Czech description
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Classification
Type
O - Miscellaneous
CEP classification
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OECD FORD branch
20302 - Applied mechanics
Result continuities
Project
<a href="/en/project/GA15-06621S" target="_blank" >GA15-06621S: Modelling of smart damping elements of rotating systems utilizing the physical properties of magnetorheological fluids</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů