Engineering Mechanics

Proceedings Vol. 25 (2019)

ENGINEERING MECHANICS 2019

Copyright © 2019 Institute of Thermomechanics of the Czech Academy of Sciences, Prague

 

Zapoměl J., Ferfecki J., Kozánek J.:
pages 419 - 422, full text

The optimum design and function of some rotating machines may require to mount the rotors in hydrodynamic bearings. To prevent excitation of non-synchronous vibration of large amplitude, the bearings are inserted in squeeze film dampers. To achieve their optimum performance in a wide range of running speeds their damping effect should be controllable. This is offered by dampers lubricated by magnetically sensitive oils. The needs of control the damping lead to the proposal and study of a new support element consisting of a hydrodynamic bearing and a magnetorheological squeeze film damper. The results of computational simulations show that from the point of view of vibration mitigation, minimization of the force transmitted to the stationary part and stability of synchronous oscillation of rigid rotors application of the studied support element provides better technological parameters in comparsion with the design variant when the rotors are mounted only in hydrodynamic bearings.

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