Coupling analysis of tribological and dynamical behavior for a thermal turbulent fluid lubricated floating ring bearing-rotor system at ultra-high speeds

Zhang, Yi; Wang, Wei; Wei, Daogao; Wang, Gang; Xu, Jimin; Liu, Kun

doi:10.1016/j.triboint.2021.107325

Cited by 27 publications

(8 citation statements)

References 33 publications

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“…[8][9][10][11][12][13] As a result, numerical models for simulating the dynamic behavior of journal bearing start-up processes have gained popularity in recent years. [14][15][16][17] In recent years, the numerical prediction of bearings during start-up has become increasingly sophisticated. Cui et al incorporated the dynamic equations of the rotor into a mixed lubrication model and numerically investigated the dynamic contact behavior of a journal bearing during start-up, discussing the effects of relative clearance and acceleration time.…”

Section: Introductionmentioning

confidence: 99%

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Transient tribo-dynamic performance of journal bearings considering wear behavior during start-up

Wei

Liao

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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The transient tribo-dynamics and wear model are coupled to study the mixed lubrication-wear behavior during start-up. The coupled numerical model involves the film thickness equation with wear depth and a time-varying wear coefficient to account for the impact of transient mixed lubrication behavior on wear. In this study, the evolution of wear and mixed lubrication performance distribution over time is predicted, and the impact of acceleration mode, acceleration time, external load, lubricant viscosity, and start-up time on the numerical predictions is evaluated. The findings demonstrate that wear behavior, particularly in the analysis of the effects of acceleration mode and acceleration time, has a significant impact on the evaluation of the bearing-rotor system's start-up performance and even changes the determination of optimal parameters. Furthermore, the parametric study demonstrates that wear and mixed lubrication performance are sensitive to the external load and lubricant viscosity. Finally, studies on the effect of start-up times show that proper wear geometry promotes hydrodynamic effects, but severely worn bearing surfaces have a negative effect on start-up.

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Section: Introductionmentioning

confidence: 99%

“…8–13 As a result, numerical models for simulating the dynamic behavior of journal bearing start-up processes have gained popularity in recent years. 14–17…”

Section: Introductionmentioning

confidence: 99%

Transient tribo-dynamic performance of journal bearings considering wear behavior during start-up

Wei

Liao

Wang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Under low-speed and heavy-load conditions (Xie and Zhu, 2021), the violent nonlinear fluctuation of a friction pair has a great influence on the movement of feed servo system requiring high precision. Related studies have shown that nonlinear friction can be improved by transforming the interface features and lubrication regime (Zhang et al , 2022).…”

Section: Introductionmentioning

confidence: 99%

Micromorphological transformation and frictional nonlinearity at a graphite powder lubricated sliding interface with low speed and heavy load

Zhou

Zhang

Yang

et al. 2022

ILT

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Purpose This study aims to investigate the microtopography transformation at a low-speed heavy-load interface with the lubrication of powder particles and its nonlinear friction effect on the sliding pair in contact. Design/methodology/approach Based on the universal mechanical tester (UMT) tribometer and VK shape-measuring laser microscope, comparative friction experiments were conducted with graphite powder lubrication. The friction coefficient with nonlinear fluctuations and the three-dimensional morphology of the boundary layer at the interface were observed and analyzed under different operating conditions. The effects on lubrication mechanisms and frictional nonlinearity at the sliding pair were focused on under different surface roughness and powder layer thickness conditions. Findings At a certain external load and sliding speed, the initial specimen surface with an appropriate initial roughness and powder thickness can store and bond the powder lubricant to form a boundary film readily. The relatively flat and firm boundary layer of powder at the microscopic interface can reduce the coefficient of friction and suppress its nonlinear fluctuation effectively. Therefore, proper surface roughness and powder layer thickness are beneficial to the graphite lubrication and stability maintenance of a friction pair. Originality/value This research is conducive to developing a deep understanding of the microtopography transformation with frictional nonlinearity at a low-speed heavy-load interface with graphite powder lubrication.

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“…Recently, an increasing number of experimental [6,7] and theoretical [8,9] studies are related to analyzing the dynamics and leakages of floating seals of high-speed rotary machines such as aircraft engines, turbopump units, or gas turbines. Studies of static and dynamic lubrication parameters of bearings with floating rings for high-speed turbocompressors deserve special attention [10,11,12].…”

Section: Introductionmentioning

confidence: 99%

Computational Analysis of Sealing and Stability of a Deformable Floating and Fixed Rings of an Annular Seal

Zahorulko

Borsuk

Peczkis

2022

JES

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Solving the hydroelastic problem by using Ansys System Coupling (Mechanical and CFX) for floating and fixed rings of a deformable annular seal made it possible to analyze the influence of the cylindrical shell thickness, the inlet and outlet edge dimensions, inlet pressure, and shaft radial displacement on the hydrostatic pressure distribution and the clearance value on length, leakages, stress-strain state, and radial force. The analysis of static stability at an inlet pressure of 10 MPa for the basic seal design showed that the static radial force in the range of radial movements of the shaft from 0 to 50% of the clearance is centering, even though the inlet part of the seal clearance has a confusor, and the outlet part has diffuser form. However, the dynamic coefficients of the fixed sealing ring have a negative value of direct stiffness but positive values of direct and cross-coupled damping and cross-coupled stiffness. Verifying computational 2D and 3D models with experimental results from the literature showed that the maximum relative error does not exceed 10.7% for the hydrostatic pressure, 18% for the clearance, and 8.6% for the leakage value. Simultaneously, according to the trend, all calculated dependencies are identical to the experimental results.

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Coupling analysis of tribological and dynamical behavior for a thermal turbulent fluid lubricated floating ring bearing-rotor system at ultra-high speeds

Cited by 27 publications

References 33 publications

Transient tribo-dynamic performance of journal bearings considering wear behavior during start-up

Transient tribo-dynamic performance of journal bearings considering wear behavior during start-up

Micromorphological transformation and frictional nonlinearity at a graphite powder lubricated sliding interface with low speed and heavy load

Computational Analysis of Sealing and Stability of a Deformable Floating and Fixed Rings of an Annular Seal

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