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A computational investigation of vibration attenuation of a rigid rotor turning at a variable speed by means of short magnetorheological dampers
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SYSNO ASEP 0341505 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Ostatní články Title A computational investigation of vibration attenuation of a rigid rotor turning at a variable speed by means of short magnetorheological dampers Author(s) Zapoměl, Jaroslav (UT-L) RID, ORCID
Ferfecki, Petr (UT-L) RIDSource Title Applied and Computational Mechanics - ISSN 1802-680X
Roč. 3, č. 2 (2009), s. 411-422Number of pages 12 s. Action Computational mechanics 2009 Event date 09.11.2009-11.11.2009 VEvent location Hrad Nečtiny Country CZ - Czech Republic Event type CST Language eng - English Country CZ - Czech Republic Keywords accelerating rotors ; magnetorheological dampers ; critical revolutions Subject RIV JR - Other Machinery CEZ AV0Z20760514 - UT-L (2005-2011) Annotation Imbalance of the rotors induces their lateral vibration and forces that are transmitted via the bearings into the foundations. These phenomena are significant if the rotor passes over the critical speeds. The vibration can be reduced if the rotor supports are equipped with damping elements. To achieve their optimum performance the damping effect must be controllable. This is enabled by application of semiactive magnetorheological squeeze film dampers. Derivation of the equations of motion starts from the first and second impulse theorems. The pressure distribution in the thin lubricating film is described by a Reynolds' equation modified for the case of Bingham liquid. The hydraulic force acting on the rotor journal is then obtained by integration of the pressure distribution around the circumference and along the length of the damper. Applicability of the developed procedures was tested by means of computer simulations. Workplace Institute of Thermomechanics Contact Marie Kajprová, kajprova@it.cas.cz, Tel.: 266 053 154 ; Jana Lahovská, jaja@it.cas.cz, Tel.: 266 053 823 Year of Publishing 2010
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