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Journal articles on the topic 'Air foil bearing'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Ravikumar, R. N., K. J. Rathanraj, Kumar Arun, and S. Supreeth. "Experimental and CFD analysis of a gas-lubricated foil thrust bearing for various foil configurations." FME Transactions 51, no. 4 (2023): 532–40. http://dx.doi.org/10.5937/fme2304532r.

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Thrust foil bearings operating at hydrodynamic conditions are self-acting (aerodynamic) bearings that support high-speed shafts at mild loading conditions with air as a lubricant and are generally used in low-power gas turbines. This paper presents an experimental study and a detailed computational analysis of dynamic characteristics of the foil thrust bearing (FTB) in terms of load-carrying capabilities as a function of thrust runner speed and gap between the bearing assembly and the runner by considering the effect of bearing parameters such as number of foils, shape of the foils, and assemb

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2

Kim, Daejong. "Parametric Studies on Static and Dynamic Performance of Air Foil Bearings with Different Top Foil Geometries and Bump Stiffness Distributions." Journal of Tribology 129, no. 2 (2006): 354–64. http://dx.doi.org/10.1115/1.2540065.

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Experimental and analytical studies on air foil bearings have been performed extensively over the past decades, and significant improvement in load capacity and rotor dynamics stability have been reported. Often, advanced air foil bearings are believed to have complicated bump foil structure to provide unique underlying support mechanism, which in turn make the bearing very stable and have high load capacity. However, all the analytical studies on air foil bearings so far assume a circular profile of top foil with uniform bump stiffness distribution because detailed information on bump stiffne

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3

Ravikumar, R. N., K. J. Rathanraj, and V. Arun Kumar. "Experimental Studies on Air Foil Thrust Bearing Load Capabilities Considering the Effect of Foil Configuration." Applied Mechanics and Materials 813-814 (November 2015): 1007–11. http://dx.doi.org/10.4028/www.scientific.net/amm.813-814.1007.

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Abstract. Foil bearings are self-acting hydrodynamics bearings used to support lightly loaded high speed rotating machinery. The advantages that they offer to process fluid lubricated machines usingworking fluid as a lubricant (ambient air) physically non-contacting high speed operation. Foil bearings have been considered as an alternative to conventional bearings with the capacity to cater for high-speeds and hostile environment (high temperature). However, the lack of load carrying capacity at relatively lower speeds limits their applications in heavy turbo machinery and as such are highly s

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4

Nielsen, Bo B., and Ilmar F. Santos. "Transient and steady state behaviour of elasto–aerodynamic air foil bearings, considering bump foil compliance and top foil inertia and flexibility: A numerical investigation." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 10 (2017): 1235–53. http://dx.doi.org/10.1177/1350650117689985.

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This work gives a theoretical contribution to the problem of modelling air foil bearings considering large sagging effects in the calculation of the non-linear transient and steady state response of a rigid rotor. This paper consists of two parts: the development of a miltiphysics model of the air foil bearing, and a numerical parameter study of a rigid journal supported in an air foil bearing with a partially supported top foil. The mathematical model of the air foil bearing is centred around the finite element models of both the air film and the top foil structure. These finite element model

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5

Xu, Fangcheng, Yi Sun, Guanghui Zhang, and Zhansheng Liu. "Effect of bump structural friction on the performance of bump foil bearing and rotor dynamic behavior: Experimental study." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 5 (2018): 702–11. http://dx.doi.org/10.1177/1350650118794536.

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Air foil bearings are a kind of self-acting lubricated bearing, which have potential applications in high-speed turbomachinery. Air foil journal bearings have simple structure that consists of top foil, bump foil, and bearing sleeve, and use gas as working fluid. However, the relative motion of top foil and bump foil, bump foil and bearing sleeve occurs when dynamic pressure is generated as long as there is spinning of shaft. Thus, the friction between each part of bearing should be considered when modeling. Many papers have theoretically shown the effect of Coulomb friction between top foil a

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6

Zhou, Quan, Yu Hou, and Ru Gang Chen. "Application of Materials on Foil Thrust Bearings for Micro Turbines." Advanced Materials Research 201-203 (February 2011): 2759–62. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.2759.

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Foil bearing that has a soft surface is a kind of air bearing. The performances of foil bearings are greatly affected by the materials of bearing surface, which is called foil element. In order to estimate the performance of foil bearings, two kinds of foil thrust bearings that are made of different materials respectively were tested in a micro turbine system, which contains rotation part and static part. Load capacity and stability of these foil thrust bearings were investigated in experiments. The results show that bearing which contains rubber has higher load capacity and bearing which cont

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7

Ying, Ming, Xinghua Liu, Chongbin Zhang, Xinyang Wang, Yuhang Liu, and Yue Zhang. "The Two-Pad: A Novel Gas Foil Bearing for Fuel Cell Vehicles." International Journal of Energy Research 2023 (September 20, 2023): 1–11. http://dx.doi.org/10.1155/2023/5521171.

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Reducing costs and improving durability are essential factors for commercializing gas foil bearings, crucial components of fuel cell vehicle air compressors. In this paper, a two-pad gas foil bearing is proposed. By reducing the number of top foils, adopting a symmetrical design, and eliminating the welding step, the cost of processing and assembly is reduced, and the potential source of failure caused by welding is eliminated. The feasibility of the two-pad gas foil bearing was verified through testing on a commercial fuel cell vehicle air compressor. Then, durability testing was performed in

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8

Agrawal, Giri L. "Foil Air Bearings Cleared to Land." Mechanical Engineering 120, no. 07 (1998): 78–80. http://dx.doi.org/10.1115/1.1998-jul-8.

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This article explores use of foil air bearings in land-based turbomachinery. A machine with foil air bearings is more reliable than one with rolling element bearings because it requires fewer parts to support the rotative assembly and needs no lubrication. Foil air bearings can handle severe environmental conditions such as the ingestion of sand and dust. A reversed pilot design at the cooling flow inlet prevents large particles from entering the bearing's flow path, and smaller particles are continually flushed out of the bearing by the cooling flow. Many applications of foil air/gas bearings

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9

Supreeth, S., T. N. Raju, R. N. Ravikuma, and C. R. Mahesha. "Parametric Studies on Performance of Oil-Free Thrust Foil Bearings at Lower Speeds." Tribology in Industry 45, no. 1 (2023): 81–88. http://dx.doi.org/10.24874/ti.1407.11.22.12.

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The present work involves an experimental analysis on gas-lubricated foil thrust bearing (FTB) that has major applications in food processing units at lower operating speeds. Parametric studies include testing thrust foil bearings with various foil configurations in terms of foil thickness, foil geometry, and foil material. Novel bearing testing apparatus designed and fabricated for the purpose supported a larger diameter (224 mm) thrust foil bearing, operated at speeds ranging from 10,000 rpm to 18,000 rpm. Performance of air foil thrust bearing (AFTB) concerning static structural stiffness a

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10

Quan, Nguyen Minh, Pham Minh Hai, and Dinh Van Phong. "The dynamic response of a rotor supported by two foil-air bearings with an enhanced model of foil structure." International Journal of Modern Physics B 34, no. 22n24 (2020): 2040160. http://dx.doi.org/10.1142/s0217979220401608.

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Foil-air bearings have presented their advantageous performance due to their different structures when compared to traditional air bearings. However, it is the nonlinear characteristic of this kind of bearing that has drawn studies on dynamic response of the rotor-bearing system, especially rotor stability. In this paper, an improved foil dynamic model with internal bending moment included has been proposed to determine the nominal stiffness of the foil structure. Based on that, the nominal stiffness of the foil structure has been investigated with different geometry parameters of the foil str

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11

Borchert, Uwe, Antonio Delgado, and Janusz A. Szymczyk. "Development and Testing of Air Foil Bearing System for an Automotive Exhaust Gas Turbocharger." Applied Mechanics and Materials 831 (April 2016): 71–80. http://dx.doi.org/10.4028/www.scientific.net/amm.831.71.

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Lubricated bearings are usually used to support and guide the shafts in gas turbines, exhaust gas turbochargers and other turbomachines. The lubricant is also used for cooling the hot parts such as the turbine side of the rotor. The high temperature condition effects a contamination of the compressed air by evaporating the lubricant. In special applications an oil-free operation has to be guaranteed. In other applications an oil lubricated bearing system prevents an immediate engine stop. The use of air foil bearings eliminates the disadvantages of the oil lubricated bearings. An air foil bear

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12

Song, Ju-ho, and Daejong Kim. "Foil Gas Bearing With Compression Springs: Analyses and Experiments." Journal of Tribology 129, no. 3 (2007): 628–39. http://dx.doi.org/10.1115/1.2736455.

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A new foil gas bearing with spring bumps was constructed, analyzed, and tested. The new foil gas bearing uses a series of compression springs as compliant underlying structures instead of corrugated bump foils. Experiments on the stiffness of the spring bumps show an excellent agreement with an analytical model developed for the spring bumps. Load capacity, structural stiffness, and equivalent viscous damping (and structural loss factor) were measured to demonstrate the feasibility of the new foil bearing. Orbit and coast-down simulations using the calculated stiffness and measured structural

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13

Feng, Guangshuo, Bo Liu, Liuyuan Li, and Yiben Zhang. "Calculation of Dynamic Coefficients of Air Foil Journal Bearings Using Time-Domain Identification." Lubricants 11, no. 7 (2023): 294. http://dx.doi.org/10.3390/lubricants11070294.

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Dynamic coefficients of a bearing are basic elements of rotor dynamics analysis. At present, there are still some issues in the calculation of the dynamic coefficient of air foil bearing. In this paper, the dynamic coefficients of the air foil bearing are calculated by time-domain identification. This method does not need to linearize the system equations, so it is generally applicable to different models for air foil bearings. Using the established method, this paper verified the calculation results using the foil model with axial uniform deformation for the first time, and the influence of t

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14

Song, Chao, Zhi Bian, Jianjun Du, Shunan Ding, and Jianjun Zhu. "Research on static characteristics of elastic foil gas thrust bearing applied to aeronautical ACM." Journal of Physics: Conference Series 2235, no. 1 (2022): 012078. http://dx.doi.org/10.1088/1742-6596/2235/1/012078.

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Abstract In air conditioning system for aircraft, air cycle machine (ACM) is the flimsy core component, which is impacted observably by the performance and reliability of elastic foil air-dynamic pressure bearing. It's necessary to have research on static characteristics of elastic foil air-dynamic pressure bearing. Based on finite element analysis (FEA) theory, it’s clearly obtained that discretized fluid lubrication Reynolds equation of foil dynamic pressure bearing by the weighted residual method. Coupled with the elastic deformation of foil calculated by beam element model, foil gas film t

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15

Zdziebko, Paweł, and Adam Martowicz. "Study on the temperature and strain fields in gas foil bearings – measurement method and numerical simulations." Eksploatacja i Niezawodnosc - Maintenance and Reliability 23, no. 3 (2021): 540–47. http://dx.doi.org/10.17531/ein.2021.3.15.

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Gas foil bearings belong to the group of slide bearings and are used in devices in which operation at high rotational speeds of the shafts are of key importance, e.g., in gas turbines. The air film developed on the surface of the bearing’s top foil allows this structural component to be separated from the shaft. This ensures a non-contact operation of the bearing. In the case of the mentioned type of bearings, their resultant operational properties are influenced by both thermal and mechanical phenomena. The current work presents a model of a gas foil bearing developed making use of the Finite

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16

DellaCorte, Christopher, Antonio R. Zaldana, and Kevin C. Radil. "A Systems Approach to the Solid Lubrication of Foil Air Bearings for Oil-Free Turbomachinery." Journal of Tribology 126, no. 1 (2004): 200–207. http://dx.doi.org/10.1115/1.1609485.

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Foil air bearings are self-acting hydrodynamic bearings which rely upon solid lubricants to reduce friction and minimize wear during sliding which occurs at start-up and shut-down when surface speeds are too low to allow the formation of a hydrodynamic air film. This solid lubrication is typically accomplished by coating the nonmoving foil surface with a thin, soft polymeric film. The following paper introduces a systems approach in which the solid lubrication is provided by a combination of self lubricating shaft coatings coupled with various wear resistant and lubricating foil coatings. The

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17

Kim, Kyeong-Su, and In Lee. "Vibration Characteristics of a 75kW Turbo Machine With Air Foil Bearings." Journal of Engineering for Gas Turbines and Power 129, no. 3 (2006): 843–49. http://dx.doi.org/10.1115/1.2718220.

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Air foil bearings are very attractive bearing systems for turbomachinery because they have several advantages over conventional bearings in terms of oil-free environment, low power loss, long life, and no maintenance. However, most of the developed machines using air foil bearings are limited to small and high-speed rotors of 60,000–120,000 rpm, since the increase in power of turbomachinery requires lower rotor speed and greater loading in bearings, which makes it difficult to use air foil bearings for large machines. In this paper, a 75 kW turboblower using air foil bearings is introduced, an

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18

Lai, Tianwei, Yu Guo, Wei Wang, Yu Wang, and Yu Hou. "Development and Application of Integrated Aerodynamic Protuberant Foil Journal and Thrust Bearing in Turboexpander." International Journal of Rotating Machinery 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/8430943.

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Foil bearing provides compliant support and moderate Coulomb friction for rotor-bearing system, which is conducive to stability and reliability of high speed rotating machinery. In this paper, both hydrodynamic lubricated foil journal and foil thrust bearings are applied in a 150 m3·h−1 turboexpander for air separation. In the bearings, protuberant foil is chosen as the supporting subfoil due to its merits of easy fabrication and assembly. Static loading and deflection of the bearings are tested, respectively, before integration into the turboexpander. Afterwards, the loading and deflection cu

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19

Bagiński, Paweł, Grzegorz Żywica, Jakub Roemer, Paweł Zdziebko, and Adam Martowicz. "Experimental Study of the Influence of Rotor Dynamics on the Temperature Distribution of a Gas Foil Bearing." Applied Sciences 12, no. 18 (2022): 9274. http://dx.doi.org/10.3390/app12189274.

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This article presents an experimental study carried out on a rotor operating on two foil bearings. One of the bearings was built in a way to measure the temperature and deformation of the top foil of the foil bearing. The dynamic performance of the two bearing journals is presented herein using the vibration trajectories and journal positions in the foil bearing sleeve. Based on these results, a method for predicting the temperature distribution on the top foil was developed. Then, the correlations between the temperature distribution and the operating parameters of the bearing journal were il

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20

Salehi, Mohsen, Erik Swanson, and Hooshang Heshmat. "Thermal Features of Compliant Foil Bearings—Theory and Experiments." Journal of Tribology 123, no. 3 (2000): 566–71. http://dx.doi.org/10.1115/1.1308038.

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The paper presents an analytical and experimental investigation aimed at eliciting the thermal characteristics of air lubricated compliant foil bearings. A Couette Approximation to the energy equation is used in conjunction with the compressible Reynolds equation to obtain a theoretical temperature distribution in the air used as a lubricant. The effect of temperature on the thermal properties of the working fluid is included. In parallel, an experimental program was run on a 100 mm diameter foil bearing operating at speeds up to 30,000 rpm employing cooling air across the bearing. The tempera

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21

Lu, Daixing, Zhengjun Zhu, and Junjie Lu. "Characteristic Analysis of Bump Foil Gas Bearing Under Multi-Physical Field Coupling." Applied Sciences 15, no. 13 (2025): 7584. https://doi.org/10.3390/app15137584.

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Due to their self-adaptability, low friction, low loss, and high-speed stability, bump foil aerodynamic journal bearings are widely used in high-speed rotating equipment such as turbomachinery and flywheel energy storage. In the process of high-speed operation, the heat generated leads to changes in air parameters (such as viscosity, density, etc.), thus affecting the overall performance of air bearings. In this paper, combined with the compressible Reynolds equation, a fluid–solid coupling model was established to analyze the steady-state characteristics and key influencing factors of bearing

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22

Peng, Z.-C., and M. M. Khonsari. "A Thermohydrodynamic Analysis of Foil Journal Bearings." Journal of Tribology 128, no. 3 (2006): 534–41. http://dx.doi.org/10.1115/1.2197526.

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A thermohydrodynamic model is developed for predicting the three-dimensional (3D) temperature field in an air-lubricated, compliant foil journal bearing. The model accounts for the compressibility and the viscosity-temperature characteristic of air and the compliance of the bearing surface. The results of numerical solutions are compared to published experimental measurements and reasonable agreement has been attained. Parametric studies covering a fairly wide range of operating speeds and load conditions were carried out to illustrate the usefulness of the model in terms of predicting the the

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23

White, James. "Design of Optimized Opposed Slider Air Bearings for High-Speed Recording on a Metal Foil Disk." Journal of Tribology 128, no. 2 (2005): 327–34. http://dx.doi.org/10.1115/1.2162917.

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A metal foil disk offers some of the best characteristics of both the hard disk and floppy disk for digital data storage. The current work defines an opposed slider air-bearing arrangement that provides advantages when used with a high-speed metal foil disk in either a fixed or removable format. Use is made of the fact that the opposing sliders interact through their influence on the flexible disk that is sandwiched between them. Asymmetry of opposing air bearings is created by etching the air-bearing pad opposite the recording element pad to a depth sufficient that the flying height and air f

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24

Han, Dongjiang, and Chunxiao Bi. "The Partial Derivative Method for Dynamic Stiffness and Damping Coefficients of Supercritical CO2 Foil Bearings." Lubricants 10, no. 11 (2022): 307. http://dx.doi.org/10.3390/lubricants10110307.

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Supercritical CO2 foil bearings are promising bearing technology for supercritical CO2 high-speed turbomachinery. The partial derivative method including complete variable perturbation of the compressible turbulent lubrication Reynolds equation is effective to predict the frequency dependent dynamic stiffness and damping coefficients of supercritical CO2 bearings. In this research, the structural perturbation of foil dynamic model was introduced into this method and then the dynamic coefficients of supercritical CO2 foil bearings were calculated. The results of parametric analysis show that th

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25

Li, Changlin, Jianjun Du, Jie Li, and Zhenni Xu. "Investigations on the Frictional Hysteresis Effect of Multi-Leaf Journal Foil Bearing: Modeling, Predictions and Validations." Lubricants 10, no. 10 (2022): 261. http://dx.doi.org/10.3390/lubricants10100261.

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Multi-leaf journal foil bearing (MLJFB) is well known for its applications in the air cycle machines (ACMs) of airplanes. However, its frictional energy dissipation mechanism of overlapped foils has not been theoretically studied and is still not clear to researchers. This paper models the frictional sliding/sticking behaviors between adjacent foil leaves based on the tangent gap, applying the penalty method of contact mechanics. Large foil deformations are calculated to simulate the processes of foil assembly and rotor insertion using nonlinear curve beam elements. Predictions of the friction

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26

Xu, Fangcheng, Zeda Dong, Jianhua Chu, Haoming Wang, and Yongliang Wang. "Experimental analysis of influence of double-layer bump foils on aerodynamic thrust foil bearings performance." Industrial Lubrication and Tribology 74, no. 1 (2022): 127–33. http://dx.doi.org/10.1108/ilt-07-2021-0281.

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Purpose Gas thrust foil bearings (GTFBs) are used to balance the axial load of engines. However, in some working conditions of large axial force, such as the use of single impeller air compressor, the load capacity of GTFBs is still insufficient. To solve this problem, the load capacity can be improved by increasing the stiffness of bump foil. The purpose of this paper is to explore a scheme to effectively improve the performance of thrust foil bearings. In the paper, the stiffness of bump foil is improved by increasing the thickness of bump foil and using double-layer bump foil. Design/method

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27

Peng, J. P., and M. Carpino. "Finite Element Approach to the Prediction of Foil Bearing Rotor Dynamic Coefficients." Journal of Tribology 119, no. 1 (1997): 85–90. http://dx.doi.org/10.1115/1.2832484.

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A finite element perturbation approach to the prediction of foil bearing stiffness and damping coefficients is presented. The fluid lubricant is modeled as a simple barotropic fluid which is described by the Reynolds equation. The structural model includes membrane, bending, and elastic foundation effects in a general geometry. The equivalent viscous damping of the Coulomb friction caused by the foil relative motion is included in the structural calculation. Bearing stiffness and damping coefficients are predicted for an air-lubricated foil bearing with a corrugated sub-foil. The effects of th

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28

Zeise, Pascal, and Bernhard Schweizer. "Numerical investigations on high-speed turbo-compressor rotor systems with air ring bearings: Nonlinear vibration behavior and optimization." Applied and Computational Mechanics 17, no. 2 (2023): 1–22. http://dx.doi.org/10.24132/acm.2023.836.

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Regarding aerodynamic bearings, mainly two basic types can be distinguished: air bearings with a rigid housing and air foil bearings with an elastic supporting structure. Here, a modified bearing concept -- called air ring bearing -- is investigated, which may be considered as a further development of rigid air bearings or as a combination of the two basic bearing types. The idea of air ring bearings is to insert a ring-shaped bearing bushing between the shaft and the foil structure. Alternatively, a visco-elastic supporting structure (e.g., an elastomer) can be applied to connect the bushing

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29

NAKAGAWA, Yukitaka, Atunobu MORI, and Norio TAGAWA. "1313 Study of Air-Lubncated Foil Journal Bearing : Development of Tension-type Foil Bearing." Proceedings of Conference of Kansai Branch 2005.80 (2005): _13–25_—_13–26_. http://dx.doi.org/10.1299/jsmekansai.2005.80._13-25_.

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30

Hu, Hongyang, and Ming Feng. "Performance of novel air foil thrust bearings with taper-groove on surface of top foil." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 235, no. 1 (2020): 79–92. http://dx.doi.org/10.1177/1350650120925338.

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To improve the load capacity of air foil thrust bearing, the micro taper-grooves on the surface of top foil was introduced and studied. A modified Reynolds equation considering the gas rarefaction effect was established, in which the Knudsen number was affected by the film thickness and pressure. A new bump stiffness model was built with the consideration of bump rounding, friction, and bending stiffness of foil. By considering the variation of gas film thickness, the load capacity, friction torque, and power loss of novel bearing with grooves were calculated by the finite difference method. M

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31

Yan, Jiajia, Zhansheng Liu, Guanghui Zhang, Xiangyu Yu, and Liang Xu. "Feasibility study of a turbocharger rotor supported by air foil bearings with diameter of 17 mm focusing on rotordynamic performance." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, no. 5 (2018): 1331–44. http://dx.doi.org/10.1177/0954407018758134.

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This paper presents the feasibility study of an oil-free turbocharger with journal bearing diameter of 17 mm. Rotordynamic performance of a turbocharger rotor, supported by two identical bump-type foil journal bearings and a pair of foil thrust bearings, is predicted and tested. High-pressure cold nitrogen is adopted to drive the turbocharger rotor. In rotordynamic analysis, the critical speeds and logarithmic decrement of the turbocharger rotor are predicted by employing the finite element method, in which the stiffness and damping coefficients of foil journal bearings and aerodynamic cross-c

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32

Wu, Fangling, and Yang Hu. "Theoretical Investigations on Tribological Properties of Air Foil Thrust Bearings during Start-Up Process." Lubricants 11, no. 3 (2023): 94. http://dx.doi.org/10.3390/lubricants11030094.

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During the start-up process, air foil thrust bearings (AFTBs) come into contact and are prone to localized overheating and even failure. Frequent starts and stops are the major sources of wear. In this study, a transient mixed lubrication model considering the air rarefaction effect is established. In the model, asperity contact between the top foil of the air foil thrust bearing (AFTB) and the rotor surface is considered using a deterministic approach, and the deformation of the foil structure is considered using the elastic-aerodynamic coupling. The influences of bearing compliance, external

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33

Olszewski, Artur, Michał Wodtke, and Piotr Hryniewicz. "Experimental Investigation of Prototype Water-Lubricated Compliant Foil Bearings." Key Engineering Materials 490 (September 2011): 97–105. http://dx.doi.org/10.4028/www.scientific.net/kem.490.97.

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First gas-lubricated compliant foil bearings (CFBs) were built in the 1950s. Due to their significant advantages, such as oil-free operation, good tolerance to bearing misalignment and very low maintenance, they have been penetrating the bearing applications for high speed compressors, air-cycle machines and gas turbines. The work presented here investigates a novel idea of water-lubricated compliant foil bearings, which could be used in applications where environmentally friendly lubrication is desired, for example in hydroelectric turbines or water pumps. Experimental results collected for t

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34

Walter, Fabian, and Michael Sinapius. "Influence of Aerodynamic Preloads and Clearance on the Dynamic Performance and Stability Characteristic of the Bump-Type Foil Air Bearing." Machines 9, no. 8 (2021): 178. http://dx.doi.org/10.3390/machines9080178.

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The dry lubricated bump-type foil air bearing enables a carrying load capacity due to a pressure build up in a convergent air film. Since the air bearing provides low power dissipation above the lift-off speed and the flexible foil provides an adaptivity against high temperatures, manufacturing errors or rotor growth, the bump-type foil air bearing is in particular suitable for high speed rotating machineries. The corresponding dynamic behavior depends on the operational parameters, the behavior of the flexible foil structure, and in particular on the circumferential clearance. In order to avo

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35

Heshmat, H. "Advancements in the Performance of Aerodynamic Foil Journal Bearings: High Speed and Load Capability." Journal of Tribology 116, no. 2 (1994): 287–94. http://dx.doi.org/10.1115/1.2927211.

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An advanced-design, aerodynamic, air-lubricated foil journal bearing achieved a landmark speed of 2200 cps (132,000 rpm) and a major breakthrough in load performance of 673.5 kPa (97.7 psi). At 20°C (68°F) room temperature, normal ambient pressure, 995 cps (59,700 rpm) rotor speed, and with bearing projected pad area of 1081 mm2 (1.675 in2), the bearing demonstrated a load capacity of 727.8 N (163.6 lb). The bearing also exhibited low heat generation, with about 40°C (104°F) average side leakage temperature rise. For this demonstration, a highspeed spindle utilizing a pair of 35-mm (1.375-in.)

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Kulkarni, Sadanand, and Soumendu Jana. "Influence of geometric parameters on the bump foil bearing performance." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 7 (2019): 1017–26. http://dx.doi.org/10.1177/1350650119887043.

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High-speed rotating system development has drawn considerable attention of the researchers, in the recent past. Foil bearings are one of the major contenders for such applications, particularly for high speed and low load rotating systems. In foil bearings, process fluid or air is used as the working medium and no additional lubricant is required. It is known from the published literature that the load capacity of foil bearings depend on the operating speed, viscosity of the medium, clearance, and stiffness of the foil apart from the geometric dimensions of the bearing. In case of foil bearing

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37

Renshaw, A. A. "Vibration Considerations in Foil-Bearing Design." Journal of Applied Mechanics 66, no. 2 (1999): 432–38. http://dx.doi.org/10.1115/1.2791067.

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The semianalytic foil-bearing solution algorithm of Eshel and Elrod (1965) is extended to the solution of the linearized, free vibration problem for one-dimensional self-pressurized foil bearings. The results demonstrate that unwanted variations in the spacing between the moving foil and the stationary bearing surface can be eliminated through proper design. The penetration depth through which vibration of the free span penetrates into the foil bearing is determined by two exponential exponents, one describing inlet penetration, the other describing outlet penetration. When the inlet exponent

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Salehi, Mohsen, Hooshang Heshmat, James F. Walton, and Michael Tomaszewski. "Operation of a Mesoscopic Gas Turbine Simulator at Speeds in Excess of 700,000rpm on Foil Bearings." Journal of Engineering for Gas Turbines and Power 129, no. 1 (2004): 170–76. http://dx.doi.org/10.1115/1.2360600.

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A small mesoscopic gas turbine engine (MGTE) simulator was tested at speeds over 700,000rpm. The MGTE was operated with specially designed miniature compliant foil journal and thrust air bearings. The operation of the simulator rotor and foil bearing system is a precursor to development of turbine powered micro-aerial vehicles and mesoscopic power generators. The foil bearings use a new fabrication technology in which each bearing is split. This feature permits the use of these bearings in highly advanced engines where single piece ceramic rotors may be required. The simulator weighed 56g (inc

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Wickert, J. A. "Free Linear Vibration of Self-Pressurized Foil Bearings." Journal of Vibration and Acoustics 115, no. 2 (1993): 145–51. http://dx.doi.org/10.1115/1.2930324.

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A foil bearing is formed when a flexible medium travels across a stationary rigid surface and entrains a thin layer of fluid that lubricates the relative sliding motion. Such bearings are used in magnetic tape drives to prevent excessive wear of the recording head and tape interface. In the one-dimensional model considered here, the tape is approximated as an axially-moving Euler-Bernoulli beam under tension, and the air pressure in the bearing region satisfies Reynolds equation for unsteady compressible flow. To the extent that transverse deformation of the tape couples with the air pressure,

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Kumar, Manish, and Daejong Kim. "Static performance of hydrostatic air bump foil bearing." Tribology International 43, no. 4 (2010): 752–58. http://dx.doi.org/10.1016/j.triboint.2009.10.015.

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Yu, Bo, Fei Wang, Hua Liu, Zhiping Zhang, and Yuhui Chen. "Research on Motor Rotor Loss of High-Speed Air Compressor in the Application of Hydrogen Fuel Cell Vehicle." Processes 11, no. 2 (2023): 475. http://dx.doi.org/10.3390/pr11020475.

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As an important component of hydrogen fuel cell vehicles, the air compressor with an air foil bearing rotates at tens of thousands of revolutions per minute. The heat generation concentration problem caused by the high-speed motor loss seriously affects the safe and normal operation of the motor, so it is very important to clarify the loss distribution of the high-speed motor and adopt a targeted loss reduction design for air compressor heat dissipation. In this paper, for an air compressor with a foil bearing with a rated speed of 80,000 rpm, an empirical formula and a three-dimensional trans

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White, James. "Air Bearing Slider-Disk Interface for Single-Sided High Speed Recording on a Metal Foil Disk." Journal of Tribology 129, no. 3 (2007): 562–69. http://dx.doi.org/10.1115/1.2736442.

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There are disk-drive data storage applications best served by single-sided recording configurations. These include situations where (i) storage requirements can be achieved on a single side of a disk and (ii) dimensional constraints on the disk drive prohibit the presence of a recording head and its associated mounting device on each side of the disk. Even if dimensional requirements are not a concern, the most cost-effective and operationally efficient slider-disk air-bearing interface for single-sided recording is one that does not include an air-bearing slider, pressure pad, or other air-be

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Liu, Xiaomin, Changlin Li, Jianjun Du, and Guodong Nan. "Thermal Characteristics Study of the Bump Foil Thrust Gas Bearing." Applied Sciences 11, no. 9 (2021): 4311. http://dx.doi.org/10.3390/app11094311.

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In this paper, a thermo-hydrodynamic model of the bump foil thrust gas bearing is developed, which solves the coupled gas film three-dimensional energy equation, non-isothermal Reynolds equation, and the foil deformation equation. The effects of bearing speed, thrust load, and external cooling gas on the bearing temperature field are calculated and analyzed. The test rig of foil thrust gas bearing was built to measure the bearing temperature under different working conditions. Both simulation and experiment results show that there exist temperature gradients on the top foil both in the circumf

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Bou-Saïd, Benyebka, Mustapha Lahmar, Ahcène Mouassa, and Bachir Bouchehit. "Dynamic Performances of Foil Bearing Supporting a Jeffcot Flexible Rotor System Using FEM." Lubricants 8, no. 2 (2020): 14. http://dx.doi.org/10.3390/lubricants8020014.

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Aerodynamic bearings have received considerable attention in recent decades and are increasingly being used in applications where high speed, low loads and high precision are required. Aerodynamic applications mainly concern auxiliary power units (APU) and air-conditioning machines (ACM). From the industrial point of view, the static and dynamic characteristics of these bearings rotating at very high speed must be determined. According to the literature, studies carried out on this type of bearing consider the elastic deformations of the foils due to the pressure generated in the air film. The

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Wang, N., and S. H. Chang. "Parallel Iterative Solution Schemes for the Analysis of Air Foil Bearings." Journal of Mechanics 28, no. 3 (2012): 413–22. http://dx.doi.org/10.1017/jmech.2012.50.

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AbstractIn an air foil bearing analysis the model is usually solved iteratively due in part to the nonlinearity of the modeling Reynolds equation and the compliance of the bearing surface. The solution procedure requires a multiple-level-deep nested iteration, which involves extended solution time and convergence difficulty. In this study, a simple air foil bearing model is used and the compressible-fluid Reynolds equation for modeling gas lubrication is linearized by Newton's method. The discretized equation is solved by one of the two parallel iterative methods, red-black or strip partition

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Hu, Hongyang, and Ming Feng. "The effect of rounding radius in bump foil structure on the static performance of foil journal bearings." Industrial Lubrication and Tribology 71, no. 5 (2019): 677–85. http://dx.doi.org/10.1108/ilt-02-2019-0058.

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Purpose The purpose of this paper is to investigate the effect of the rounding in bump foil on the static performance of air foil journal bearings. Design/methodology/approach During the study, the bending moment of the new foil structure with rounding is proposed, and the bump foil stiffness is obtained from the elastic deformation energy theory. The validity of the presented foil model is verified through comparison with previous models. The static characteristics of foil bearings such as film thickness and attitude angle are obtained using a fully coupled elastic-gas algorithm and are compa

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Peng, Z. C., and M. M. Khonsari. "Hydrodynamic Analysis of Compliant Foil Bearings With Compressible Air Flow." Journal of Tribology 126, no. 3 (2004): 542–46. http://dx.doi.org/10.1115/1.1739242.

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A model is developed to predict the hydrodynamic performance of a foil journal bearing. The model accounts for both the compressibility of air and the compliance of the bearing surface. A series of predictions of the load-carrying capacity based on the numerical solution for pressure is presented that cover a wide range of operating speeds. The results show good agreement with existing experimental data.

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Bondarenko, M., R. Polyakov, and A. Gorin. "Performance of the hybryd bearing with air-lubricated foil bearing and active control." Proccedings of International Scientific Conference "BALTTRIB 2019" 1 (2019): 174–79. http://dx.doi.org/10.15544/balttrib.2019.28.

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Zhang, Wei, Abbas A. Alahyari, and Louis Chiappetta. "A Fully Coupled Fluid–Structure Interaction Model for Foil Gas Bearings." Journal of Engineering for Gas Turbines and Power 139, no. 2 (2016). http://dx.doi.org/10.1115/1.4034343.

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Foil gas bearings are self-acting, compliant-surface hydrodynamic bearings that usually use air or other process gas as their working fluid or lubricant. Foil gas bearings are made of one or more bump foils, which are compliant surfaces of corrugated metal, and one or more layers of top foil. Because foil gas bearing performance parameters, such as load capacity, are dominated by foil material and foil geometric designs, numerical models have been developed to predict the bearing's performance based on these characteristics. However, previous models often simplify bump foil as elastic foundati

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Abhishek, H. E., and Dr R. N. Ravikumar. "Effect of varying stiffness of top foil on the performance of Air foil thrust bearing (AFTB)." International Journal Of Scientific Research In Engineering & Technology, March 1, 2024, 01–13. http://dx.doi.org/10.59256/ijsreat.20240402001.

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Air foil thrust bearings (AFTB) are essential components in various rotating machinery, such as gas turbines and turbochargers, designed to support higher loads while minimizing friction and wear. The project aims to investigate the effect of varying stiffness of the top foil on the performance of air foil thrust bearings. The stiffness of the top foil is a critical parameter that influences the bearing's load-carrying capacity, stability, and overall efficiency. The geometric parameters like foil geometry, sector angle of top foil, initial angle of top foil and thickness of top foil and opera

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