Avoiding disc collisions and nonlinear vibration of unbalanced rotors by means of position control of the rotor journal mounted in magnetorheological hydrodynamic bearings

0570632 - ÚT 2024 RIV GB eng J - Journal Article
Zapoměl, Jaroslav - Ferfecki, P. - Kozánek, Jan
Avoiding disc collisions and nonlinear vibration of unbalanced rotors by means of position control of the rotor journal mounted in magnetorheological hydrodynamic bearings.
International Journal of Non-Linear Mechanics. Roč. 151, May (2023), č. článku 104378. ISSN 0020-7462. E-ISSN 1878-5638
Institutional support: RVO:61388998
Keywords : rotor vibration * disc-casing collisions * magnetorheological hydrodynamic bearings * composite magnetorheological lubricant * position control
OECD category: Applied mechanics
Impact factor: 3.2, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S0020746223000306?via%3Dihub

Rotors of rotating machines are often supported by hydrodynamic bearings. Imbalance, ground vibration, assembling inaccuracies, and eccentric position of the shaft journal in the bearing hole may result in collisions between the rotors and their casings if the gap between the rotating and stationary parts is narrow. This can be avoided by controlling the position of the rotor journal in the bearing hole by changing stiffness of the oil film. This method of controlling parameters of the lubricating layer is offered by application of magnetically sensitive fluids. A new design of magnetically controllable hydrodynamic bearing was developed. The magnetic flux is generated by an electric coil. Results of the computational simulations showed that application of a magnetic field acting on magnetorheological lubricant in the bearing gap makes it possible to prevent impacts between the rotor and its casing in a certain velocity interval, or at least to reduce magnitude of the impact forces if collisions occur.
Permanent Link: https://hdl.handle.net/11104/0342390