Evolutive and nonlinear vibrations of rotor on aerodynamic bearings

Půst, L.; Kozánek, Jan

doi:10.1007/s11071-007-9228-z

Cited by 8 publications

(4 citation statements)

References 5 publications

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“…Půst and Kozánek [13] have analyzed an aerodynamic tilting-pad bearing supporting a rigid rotor, and they have concluded that the inertia of pads has had a great influence on the bearing characteristics, and on the investigation of rotor vibration.…”

Section: Introductionmentioning

confidence: 99%

Rotordynamic analysis of systems with a non-linear model of tilting pad bearings including turbulence effects

Okabe

Cavalca

2008

Nonlinear Dyn

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An analytical model of a tilting pad bearing was developed based on the short bearing assumption with the turbulence effect included. In order to determine its influence on the dynamic behavior of the rotor, this model was compared against one without the turbulence effect through a simulation of a Jeffcott/Laval rotor supported by a couple of bearings. Both models were also used to determine the influence of geometric parameters on tilting pad bearing making use of the aforementioned system at different rotor speeds.When analyzing the results, the parameters which presented the largest influence were: pad preload, number of segments, radial clearance, pad position, and pad pivoting angle. As the pad moment of inertia and the pivoting distance have changed the shaft motion only a few microns, their effects can be neglected. The bearing model with turbulent flow effect has generated higher hydrodynamic forces when compared to the one without this effect, which remarks the importance of considering such phenomenon during the analysis of the high speed hydrodynamic bearings.

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Section: Introductionmentioning

confidence: 99%

Rotordynamic analysis of systems with a non-linear model of tilting pad bearings including turbulence effects

Okabe

Cavalca

2008

Nonlinear Dyn

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“…Apparently from the equations aerodynamic forces have three components: quasi-elastic, damping and non-conservative forces [2]. Differential equations of motion of system "rotor -ring" with account of aerodynamic forces can be written in the complex form (rotor displacement is 1 1…”

Section: Dynamics Of System "Rotor -Ring"mentioning

confidence: 99%

Some Features of Rotor Dynamics inside Floating Sealing Ring

Banakh¹,

Никифоров²,

Panovko³

2006

SSP

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Flow-coupled vibrations of system “rotor-ring” are researched. Absence effect of critical rotor velocity and dynamic absorption of rotor vibration in the system “rotor-ring” is described. These properties are caused by aero(hydro)dynamic forces in the clearance between rotor and ring. Result of lowered vibration for high-speed rotor of turbo-pump containing floating sealing rings is submitted.

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“…[4][5][6] Aerodynamic/hydrodynamic bearings present a relatively large wear rate during startup stage and have high requirements for design and processing. [7][8][9] Magnetic bearings can only act on magnetic materials and produce electromagnetic interference to precision instruments. 10,11 Therefore, starting from the new working principle, exploring new methods may be a way to expand the application field of non-contact bearings.…”

Section: Introductionmentioning

confidence: 99%

The performance evaluation of a surface-textured ultrasonic levitation bearing under multi-operation mode

Shi

Gao

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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The load capacity of ultrasonic levitation bearing has become an important factor limiting its practical application in engineering, due to which the load capacity is very small compared to that of other gas bearing. In order to obtain greater load capacity, surface texture is introduced into ultrasonic levitation bearing in this study. A theoretical model considering the geometry parameters and mode shape is established to obtain the running performance of surface-textured ultrasonic levitation bearing, which is solved by using eight-point discrete grid finite-difference method. Influence of driving voltage, rotational speed, eccentricity ratio, texture position, and texture size parameters on load capacity is investigated systematically. Previous experimental results were used to verify the feasibility of the proposed model. The results show that positive texture can effectively improve the load capacity of ultrasonic levitation bearing, especially under ultrasonic levitation mode. Research results are instructive for understanding the lubrication mechanism of ultrasonic levitation bearing and further promote the practical application of the bearing in engineering.

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Evolutive and nonlinear vibrations of rotor on aerodynamic bearings

Cited by 8 publications

References 5 publications

Rotordynamic analysis of systems with a non-linear model of tilting pad bearings including turbulence effects

Rotordynamic analysis of systems with a non-linear model of tilting pad bearings including turbulence effects

Some Features of Rotor Dynamics inside Floating Sealing Ring

The performance evaluation of a surface-textured ultrasonic levitation bearing under multi-operation mode

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