Stability analysis and optimization of a hybrid rotating machinery support combining journal bearings with viscoelastic supports

Ribeiro, Eduardo A. R.; Alves, Diogo Stuani; Cavalca, Kátia Lucchesi; Bavastri, Carlos Alberto

doi:10.1016/j.mechmachtheory.2020.104166

Cited by 13 publications

(5 citation statements)

References 35 publications

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“…Shimmed gas-foil bearings (figure 17(d)) are prepared by inserting metal shims between the bearing housing and the foil structures [108]. Metal shims create multi-pad gas films Pre-loaded three-pad GFB [107] Radial preloads are increased to create a multi-pad gas film Shimmed GFBs [108] Metal shims are inserted between the bearing housing and foil structures Utilizes a compliant structure with large structural damping Flexure pivoted three-pad GFB [109] Flexure pivots are integrated into the foil structure Viscoelastic GFB [110] A viscoelastic polymer layer is inserted into the foil structure Metal mesh GFB [111] Bump foil is replaced by an annular metal mesh Double-layer bumpy GFB [105] A second bumpy layer is inserted into the foil structure…”

Section: Passive Strategies For Ensuring Rotordynamic Stabilitymentioning

confidence: 99%

“…Structural damping and structural stiffness are known to crucially affect the stability and load carrying capacity of gas foil bearings. The bearing performance can be improved by compliant structures with enhanced structural damping, such as viscoelastic foil bearings [122] and metal mesh foil bearings Reprinted from [110], © 2020 Elsevier Ltd. All rights reserved. (f) Mesh metal gas foil bearing [111].…”

Section: Excessively High Voltage Requirementsmentioning

confidence: 99%

“…Damping forces can be generated by deforming a viscoelastic polymer material under hydrodynamic pressure (figure 18). Ribeiro et al [110] established a mathematical model that calculates generalized equivalent parameters, providing the basis for determining the natural frequencies of bearing systems exhibiting viscoelastic behaviors (figure 17(e)). An experimental study by Lee et al [124] verified much higher equivalent viscous damping in viscoelastic foil bearings than in traditional bump bearings with a comparable structural dynamic stiffness.…”

Section: Excessively High Voltage Requirementsmentioning

confidence: 99%

“…Reprinted from [108], © 2020 Elsevier Ltd. All rights reserved. (e) Viscoelastic gas foil bearing [110].Reprinted from[110], © 2020 Elsevier Ltd. All rights reserved. (f) Mesh metal gas foil bearing[111].…”

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confidence: 99%

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Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Zhang,

Huang,

Chen

et al. 2024

Int. J. Extrem. Manuf.

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Fluid lubricated bearings have been widely adopted for supporting components of high-end equipments in the field of metrology, semi-conductor, aviation, strategic defense, ultra-precision manufacturing, medical treatment and power generations. These fields all involve extreme working conditions such as ultra-high moving precision, ultra-high rotation speed, ultra-heavy bearing load, ultra-high environmental temperature, high radiation and high vacuum, which present challenges for the design and optimization of reliable fluid lubricated bearings. Breakthrough of any related bottlenecks will promote the development course of high-end equipments. To further promote the advancement of high-end equipments, this paper reviews the design and optimization of fluid lubricated bearings operated with typical extreme working performances. Targeting on the realization of extreme working perfor mances, the current challenges, the current solutions, the underlying deficiencies and the promising developing directions regarding to the design and optimization of fluid lubricat ed bearings are systematically pointed out. This paper can provide guidance for choosing suitable fluid lubricated bearings and optimizing their structures based on required extremeworking performances.

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Section: Passive Strategies For Ensuring Rotordynamic Stabilitymentioning

confidence: 99%

Section: Excessively High Voltage Requirementsmentioning

confidence: 99%

Section: Excessively High Voltage Requirementsmentioning

confidence: 99%

mentioning

confidence: 99%

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Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Zhang,

Huang,

Chen

et al. 2024

Int. J. Extrem. Manuf.

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“…Oil film journal bearings have been widely used in rotating machinery operating at high speed, such as compressors and turbines, for the extra damping they provide, their superior durability, and the relatively low cost of maintenance [1]. Therefore, this type of bearing is considered one of the most important machine elements for enhancing the rotating machinery's operation quality [2].…”

Section: Introductionmentioning

confidence: 99%

Effect of Chamfer Form and Parameters on the Characteristics of Finite Length Journal Bearing under Impact Load

et al. 2023

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Journal bearings in typical applications are subjected to misalignment due to several causes, such as shaft deformation under load and errors related to the installation and manufacturing processes. Misalignment has well-known severe negative consequences on the performance of the bearings. This paper deals with the bearing chamfer to reduce these consequences of misalignment, and two forms of bearing edge modification are considered in the analysis. These forms are linear and curved chamfering of the bearing edges, where the height of the chamfer in the circumferential direction and the length of the modification in the longitudinal direction are considered as geometrical design parameters. The investigation includes a numerical solution of the hydrodynamic lubrication problem of finite length journal bearing, considering 3D misalignment cases using the finite difference method. This includes the assessment of the chamfer forms and their effects on the bearing performance in terms of the main bearing design parameters. Furthermore, the stability of the chamfered bearings is also investigated under impact load. Results showed that both chamfer forms are beneficial for a certain limit of the design parameters in reducing the maximum pressure and coefficient of friction and in elevating the film thickness levels, extending the range of misalignment in which the journal bearing can operate safely. In addition, the chamfered bearings in both forms showed more stability range in terms of the critical speed and shaft center trajectories under impact load. The bearings with the curved chamfer, where the slope is continuous at the start of modification, showed more uniform film thickness levels, and their shaft center trajectories were closer to the perfectly aligned bearing in the stable operating range of the system.

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Mathematical and Computer Simulation of Rotor Dynamics Phenomena in Electromechanical Systems with Magnetic Bearings

Martynenko

2022

Integrated Computer Technologies in Mechanical Engineering - 2021

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Stability analysis and optimization of a hybrid rotating machinery support combining journal bearings with viscoelastic supports

Cited by 13 publications

References 35 publications

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Design and optimization of fluid lubricated bearings operated with extreme working performances—a comprehensive review

Effect of Chamfer Form and Parameters on the Characteristics of Finite Length Journal Bearing under Impact Load

Mathematical and Computer Simulation of Rotor Dynamics Phenomena in Electromechanical Systems with Magnetic Bearings

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