Thrust Bump Air Foil Bearings with Variable Axial Load: Theoretical Predictions and Experiments

Lee, Yongbok; Kim, Tae Young; Kim, Chang Ho; Kim, Tae Ho

doi:10.1080/10402004.2011.606957

Cited by 34 publications

(22 citation statements)

References 20 publications

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“…A numerical algorithm is developed to solve equation (1) along with equation (2) to obtain the pressure in the bearing film zone, and simulations are performed with the input data taken from Lee et al 13 work shown in Table 1. The numerically obtained load data for various cases of bearing dimension as shown in Table 1 has been tabulated in Table 2.…”

Section: Validation Of Solutionsmentioning

confidence: 99%

The limiting load-carrying capacity of foil thrust bearings

Samanta

Khonsari

2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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A simple procedure is proposed for predicting the limiting pressure and corresponding limiting of the load-carrying capacity of a foil thrust bearing. A closed-form analytical solution for the limiting load is derived, and the predictions are verified by the numerical solution. An approximate solution for limiting thrust load is also obtained and compared to the value obtained through the analytical solution. A parametric analysis is performed to examine the dependency of the limiting load on different geometric parameters for the bearing.

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Section: Validation Of Solutionsmentioning

confidence: 99%

The limiting load-carrying capacity of foil thrust bearings

Samanta

Khonsari

2017

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…Three types of bearings with different outer radii had been were tested to verify the theoretical model. Nevertheless, this paper didn't research the influence of the taper inlet height on bearing characteristics [25]. In 2015, Andres and Ryu etc.…”

Section: Introductionmentioning

confidence: 98%

“…In some literatures, the models considering foil deformation had been also proposed [5,[22][23][24][25][26]. In 2008, Park D. J. and Kim C. H. etc.…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental study on air thrust foil bearing performance with improved structural model based on real-time taper inlet height

Fei

Hou

et al. 2020

Preprint

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Abstract Air thrust foil bearings are key bearings of micro turbo-machinery (such as micro gas turbines, turbo blowers, and air compressors). The bearing load capacity is affected by many factors, and the taper inlet height of bearing structure is closely related to the load capacity. In many previous literature the taper inlet height, as a constant value, was used to calculate film thickness distribution. However, the reality is that the foil will be squeezed by the pressure generated between runner disk and top foil, which makes taper inlet height change during iteration. Therefore, the actual bearing taper inlet height should be chosen properly instead of the constant taper inlet height when iterating. In this paper, an improved computational model of film thickness for adjusting the taper inlet height in real-time is proposed. The relationship between the maximum bearing load capacity and taper inlet height at different rotor speeds of two models is obtained through numerical simulation. It is found that the optimal taper inlet height of the new model is larger than that of the old model. Three types of bearings with different taper inlet height (20μm, 70μm, 114μm) had been tested and the maximum load capacity at different rotor speeds had been obtained. Finally, test data and the simulation results of the two models are compared. It is found that the simulation results of the two models are quite different when the taper inlet height is near the optimal taper inlet height, and the new model is more agree well with the test data.

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“…The experiments emphasized the conclusion that the loadcarrying capacity of foil thrust bearings increase nonlinearly with speed and thermal runaway causes the bearing load capacity to drop off at high rotation speeds. Further, Lee et al 23 successfully developed a thrust test facility to determine the relation between load capacity and the deflection of the ''first generation'' foil thrust bearing. The nonlinear stiffness coefficients obtained with simple tests were applied to the theoretical analysis of the bearing in order to consider the nonlinear effects of the thrust bump structure.…”

Section: Introductionmentioning

confidence: 99%

Tailoring of the bearing stiffness to enhance the performance of gas-lubricated bump-type foil thrust bearing

Gad

Kaneko

2015

Proceedings of the Institution of Mechanical Engineers, Part J:

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This study aims to tailor the bearing stiffness for enhancing the load-carrying capacity of foil thrust bearings. New architectures for the bump foil are introduced with structural stiffness tailored in the radial and circumferential directions to ensure a converging gas film under high axial loads while maintaining a reasonable bearing compliance to accommodate thermal as well as mechanical distortions. The structural stiffness of the bearing is calculated with an analytical method previously introduced by the authors, and the flow in the gas film is modeled with 2-D compressible Reynolds equation. The Couette Approximation technique is used to calculate the temperature distribution in the gas film and the small perturbations method is used to calculate its dynamic force coefficients. Enhanced load capacity could be obtained with the introduced bump foil designs.

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Thrust Bump Air Foil Bearings with Variable Axial Load: Theoretical Predictions and Experiments

Cited by 34 publications

References 20 publications

The limiting load-carrying capacity of foil thrust bearings

The limiting load-carrying capacity of foil thrust bearings

Numerical and experimental study on air thrust foil bearing performance with improved structural model based on real-time taper inlet height

Tailoring of the bearing stiffness to enhance the performance of gas-lubricated bump-type foil thrust bearing

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