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dc.contributor.authorFerfecki, Petr
dc.contributor.authorZapoměl, Jaroslav
dc.contributor.authorKozánek, Jan
dc.date.accessioned2017-03-08T08:35:22Z
dc.date.available2017-03-08T08:35:22Z
dc.date.issued2017
dc.identifier.citationAdvances in Engineering Software. 2017, vol. 104, p. 1-11.cs
dc.identifier.issn0965-9978
dc.identifier.issn1873-5339
dc.identifier.urihttp://hdl.handle.net/10084/116890
dc.description.abstractPlacing damping devices between the rotor and its frame is a frequently used engineering solution for reducing excessive vibrations of rotating machines. Their damping effect must be controllable to achieve their optimum performance in a wide range of operating speeds. This is enabled by magnetorheological squeeze film dampers, the damping force of which can be controlled by changing magnetic flux passing through the lubricating layer. The magnetorheological oil is represented in the developed mathematical model by Bingham material. The magnetic induction in the damper gap is a significant parameter that directly influences resistance against the flow of the magnetorheological oil and generates the additional magnetic force acting on the rotor journal. Therefore, three approaches (1D, 2D, and 3D) to determination of the semi -analytical relations describing its distribution in the lubricating film were proposed, tested, and compared. The appropriate coefficients were determined by repeatedly solving 2D or 3D magneto static problems for the specified damper dimensions, design, and rising magnitude of the journal eccentricity utilizing the finite element and least square methods. In the developed computational model of the rotating machine, the rotor shaft is represented by a beam like -body that is discretised into finite elements. The magnetorheological dampers are implemented by springs and force couplings. The principal contribution of this article consists in the development of a methodology, based on three approaches, for the derivation of closed form formulas describing the distribution of magnetic induction in the damper gap as a function of the rotor journal eccentricity and angular position. The individual approaches give some differences in the results that are consequent upon the distinguishing level used for modelling the damping device. The extent of their applicability is discussed in the article. The developed computational models are intended for the investigation of the vibration attenuation of rotor systems in a wide range of rotational speeds.cs
dc.language.isoencs
dc.publisherElseviercs
dc.relation.ispartofseriesAdvances in Engineering Softwarecs
dc.relation.urihttp://dx.doi.org/10.1016/j.advengsoft.2016.11.001cs
dc.rights© 2016 Elsevier Ltd. All rights reserved.cs
dc.subjectmagnetorheological squeeze film damperscs
dc.subjectmagnetorheological oilscs
dc.subjectclosed form formulascs
dc.subjectfitting the coefficientscs
dc.subjectmultiphysical problemcs
dc.subjectrotor vibration attenuationcs
dc.subjectdamping efficiencycs
dc.titleAnalysis of the vibration attenuation of rotors supported by magnetorheological squeeze film dampers as a multiphysical finite element problemcs
dc.typearticlecs
dc.identifier.doi10.1016/j.advengsoft.2016.11.001
dc.type.statusPeer-reviewedcs
dc.description.sourceWeb of Sciencecs
dc.description.volume104cs
dc.description.lastpage11cs
dc.description.firstpage1cs
dc.identifier.wos000392680600001


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