Frictional analysis on stiffness and damping characteristics of bump foil gas bearings

Zhao, Qi; Qiang, Mingchen; Yan, Shaohang; Li, Xue; Hou, Yu; Lai, Tianwei

doi:10.1177/13506501221132110

Cited by 4 publications

(4 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[𝐾] = ∑[𝐾] 𝑖 𝑖=1 , {𝑓} = ∑{𝑓} 𝑒 𝑖 (5) [𝐾]{∆𝑐} = {𝑓} (6) Equivalent damping was introduced to represent the energy dissipation capacity, as shown in the following [50]:…”

Section: ∂(ρU) ∂Xmentioning

confidence: 99%

See 1 more Smart Citation

Feasibility Analysis of Adopting the Hydrogen Hydrostatic Thrust Bearing

Qiang,

Liu,

Zhao

et al. 2023

Applied Sciences

Self Cite

View full text Add to dashboard Cite

The hydrogen hydrostatic thrust bearing (HHTB) is a key component of hydrogen liquefaction that impacts turbo-expander characteristics. To analyze the feasibility of using the HHTB in this application, characteristics of HHTBs were calculated using a CFD model. To upgrade the performance of the HHTB, the impacts of bearing structure and operating parameters on static performance were investigated. Dynamic characteristics of the HHTB were studied using the dynamic grid method. It was found that the load capacity of the HHTB is less than that of helium-lubricated bearings but higher than that of air- and methane-lubricated bearings. The turbulent kinetic energy of hydrogen is higher than that of other gases. Load capacity can be enhanced through boosting supplied pressure, expanding the diameter of supply orifices, reducing gas film clearance, increasing the orifices quantity and setting a circumferential groove. A reduction in disturbance amplitude slightly increased the bearing’s dynamic stiffness. The dynamic stability of the HHTB was improved by a small film clearance in response to disturbance.

show abstract

Section: ∂(ρU) ∂Xmentioning

confidence: 99%

“…Equivalent damping was introduced to represent the energy dissipation capacity, as shown in the following [50]:…”

Section: Grid Independence and Model Validationmentioning

confidence: 99%

Feasibility Analysis of Adopting the Hydrogen Hydrostatic Thrust Bearing

Qiang,

Liu,

Zhao

et al. 2023

Applied Sciences

Self Cite

View full text Add to dashboard Cite

show abstract

“…In subsequent studies, many scholars have proposed different ways to introduce Coulomb friction to improve the model and the calculation formula of foil stiffness. [14][15][16][17][18][19] Zhao et al 20 analyzed the friction of bump foil bearings with different structures, and found that in engineering operation of the foil bearings design, friction coefficient and bump height need to be selected properly to obtain optimal stiffness and damping characteristics of the foil bearings. The research object of these improved models is the bump foil, while ignoring the influence of the flat foil.…”

Section: Introductionmentioning

confidence: 99%

Development and performance research of a new-type air foil bearing with combined bump foils

Shao,

Xu,

et al. 2024

Proceedings of the Institution of Mechanical Engineers, Part J:

View full text Add to dashboard Cite

In this paper, a new-type air foil bearing with combined bump foils is proposed. The bump foils are arranged and combined in the axial direction. The local and global stiffness of the bearing can be adjusted by the combination of the bump foils. Mechanical analysis of the bearing is carried out, and the mechanical model of the elastic deformation of the flat foil and the bump foils is constructed. Combined with non-isothermal Reynolds equation and energy equation, a fluid–solid coupling numerical calculation model is constructed. Through the actual bearing test research, the reliability of the established theoretical model is verified. On this basis, combined with the specific example, the influences of the structural parameters of the new-type foil bearing on its mechanical properties and lubrication performance are studied, and the specific influence curves are obtained. It is also found that the new-type bearing proposed in this paper has good adaptability to the shaft deflection. When the shaft is deflected, the bump foil at the axial end increases the minimum film height by generating large elastic deformation, which can help to avoid wear caused by direct contact between the shaft and the foil.

show abstract

“…Gas foil bearings, known for their structural simplicity, cost-effectiveness, environmental friendliness, and high-speed stability, 1,2 have gained significant traction in the realm of high-speed turbo machinery, including micro gas turbines, turbo expanders, and centrifugal compressors. 3–6 On the one hand, micro gas turbines operate under extreme temperature conditions, with operating temperatures ranging from 600 to 1000 °C.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis and optimization of bionic cooling channels of gas foil thrust bearings

Zhao,

Yan,

Qiang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part J:

Self Cite

View full text Add to dashboard Cite

Under high-temperature conditions, heat evacuation of foil bearing has a significant impact on bearing performance, including loading performance and reliability. During bearing operation, viscous dissipative heat in the lubricant gas film is the main source of heat generation. For foil bearings, enhancing the heat evacuation efficiency is essential to extend the bearing service life in high-temperature environments. For heat evacuation, foil-side cooling is a very effective method. For more in-depth analysis of thermal characteristics of the foil bearing, a three-dimensional (3D) thermal-elasto-hydrodynamic (TEHD) coupling model of multi-leaf thrust foil bearing (MLTFB) with cooling channel is established in this paper. In view of the good heat transfer performance and more uniform gas velocity distribution in bionic flow channels, various bionic cooling channels of foil bearings are proposed and the structural parameters are optimized. The effects of cooling channel type, cooling channel width, span ratio, cooling gas supply mode, and rotational speed on the thermal and loading performance of foil bearings are investigated. The studies demonstrate that the spider net round cooling channel exhibits higher heat transfer performance and improved uniformity of temperature. Compared to the cooling gas supply from inner edge, the cooling gas supply from the outer edge proves to be more effective. The maximum temperature of lubricant gas film can be greatly reduced with wider cooling channels and a smaller channel span at the outer edge. The maximum temperature of lubricant gas film and bearing load are reduced as the Reynolds number of cooling gas increases. There exists an optimal Reynolds number that can achieve the highest uniformity of temperature.

show abstract

Frictional analysis on stiffness and damping characteristics of bump foil gas bearings

Cited by 4 publications

References 34 publications

Feasibility Analysis of Adopting the Hydrogen Hydrostatic Thrust Bearing

Feasibility Analysis of Adopting the Hydrogen Hydrostatic Thrust Bearing

Development and performance research of a new-type air foil bearing with combined bump foils

Thermal analysis and optimization of bionic cooling channels of gas foil thrust bearings

Contact Info

Product

Resources

About