A computational study on the influence of the delayed yielding phenomenon in magnetorheological oils on the steady state vibration and forces transmitted between the rotor and its frame

0484158 - ÚT 2018 eng A - Abstract
Zapoměl, Jaroslav - Ferfecki, Petr - Kozánek, Jan
A computational study on the influence of the delayed yielding phenomenon in magnetorheological oils on the steady state vibration and forces transmitted between the rotor and its frame.
2017.
[International Conference on Engineering Vibration. 04.09.2017-07.09.2017, Sofia]
R&D Projects: GA ČR GA15-06621S
Institutional support: RVO:61388998
Keywords : MR squeeze film damper * delayed yielding * rotor vibration attenuation * transmitted force reduction
Subject RIV: JR - Other Machinery

A frequently used technological solution to reduce lateral vibration of rotating machines is placing damping devices between the rotor and its stationary part. To achieve their optimum performance, their damping effect must be controllable. This is offered by magnetorheological squeeze film dampers. Their main parts are two concentric rings between which is a thin layer of magnetorheological oil. The inner ring is coupled with the rotor journal by a rolling element bearing and by a squirrel spring with the damper housing. Lateral oscillation of the rotor squeezes the oil film which produces the damping force. As the flow of magnetorheological oils is affected by a magnetic field, the hange of magnetic flux generated in electric coils is used to change the damping effect. The magnetorheological lubricants belong to the class of liquids with a yielding shear stress.
Permanent Link: http://hdl.handle.net/11104/0279648