Foil stiffness optimization of a gas lubricated thrust foil bearing in enhancing load carrying capability

Supreeth, S.; Ravikumar, R.N.; Raju, T. N.; Dharshan, K.

doi:10.1016/j.matpr.2021.11.210

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…They [31] also noticed that the square copper foils carried greater thrust loads in comparison to sector angular foils, moreover the hydrodynamic FTB with more number of foils supported higher loads. Optimization of foil stiffness by varying foil sector angle, foil thickness, and foil material was carried out experimentally by Supreeth and others [32] on the same bearing test rig for an AFTB with six 60° steel foils of 0.2 mm foil thickness at 40,000 rpm rotational speeds, along with the pressure distribution plots on the top foil being simulated in ANSYS for actual conditions.…”

Section: Experimental Reviewmentioning

confidence: 99%

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A Review on Performance Characteristics of an Air Foil Thrust Bearing

Shivakumar¹,

NagaRaju²,

Ravikumar³

et al. 2022

Tribology Online

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The axial loads of high-speed rotating turbo machines are supported by self-acting hydrodynamic components known as air foil thrust bearings (AFTB). The load bearing capability of these bearings depends primarily on the foil structure and secondarily on the operating conditions. The present review enlightens on the tribological performance parameters of the said bearing in enhancing the load carrying capacity. Various design and fabrication methods including theoretical models are briefly summarised and comparisons of experimental results are presented in order to reveal the possible research gap that leads in optimising the gas lubricated foil thrust bearings (GFTB) for their better employment in typical applications.

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Section: Experimental Reviewmentioning

confidence: 99%

“…8. Using only angular steel top foils (TF) for an AFTB of BD 60 mm (FSA being 2600 mm 2 ), Supreeth [32] illustrated a maximum load capacity of 52 N to 56 N for speeds ranging from 20,000 to 40,000 rpm. 9.…”

Section: Comparative Surveymentioning

confidence: 99%

A Review on Performance Characteristics of an Air Foil Thrust Bearing

Shivakumar¹,

NagaRaju²,

Ravikumar³

et al. 2022

Tribology Online

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“…Experimentations on GFTB were conducted by Ravikumar et al [15,16] with only top foil for speeds up to 45,000 rpm using square foils, angular foils, and cascaded foils for inner edge of the foil being same and different with respect to outer edge. Supreeth and others [17] performed parametric analyses in optimization of foil stiffness for a GFTB of 60 mm diameter that included some CFD simulations. Also, reviews on AFTB [18,19] has enlightened on the factors affecting the performance of the bearing including some informative research gaps.…”

Section: Introductionmentioning

confidence: 99%

Parametric Studies on Performance of Oil-Free Thrust Foil Bearings at Lower Speeds

Shivakumar¹,

Raju²,

Ravikuma³

et al. 2023

Tribol. Ind.

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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 and load bearing capability was determined in optimizing the best foil configuration. A novel dimensionless number was formulated that emphasizes the affecting factors of thrust foil bearing with respect to axial loads.

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“…Multiphysics CAE simulation by Yu and Wang [11] verified the accuracy of the computational method by building a 3D fluid-structure interaction (FSI) model of GFTB manifested pressure and temperature distribution along with foil displacements. Experimentations by Supreeth S et al [12,13] on foil thrust bearings with various top foil configurations at different speeds, along with simulations in ANSYS, threw awareness on the term foil stiffness. Some experimentations by R N Ravikumar and others [14,15] on top foil configurations added enormous knowledge to the present study.…”

Section: Introductionmentioning

confidence: 99%

Experimental and CFD analysis of a gas-lubricated foil thrust bearing for various foil configurations

Ravikumar,

Rathanraj,

Arun

et al. 2023

FME Transactions

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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 assembly of foils on the bearing pad. The parametric study was conducted on a newly conceptualized bearing test rig capable of rotating up to 45,000 rpm speeds that measured the axial loads of the air foil thrust bearings (AFTB). The computational model of the foil thrust bearings for various configurations with top foils is simulated using multiphysics software for foil deflections and pressure distributions on the foil surface. The numerical results were compared with the experimental values, while the air foil thrust bearings with multilayered foils called cascaded foils (patented) had higher load capability in comparison to other conventional bearing models.

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Foil stiffness optimization of a gas lubricated thrust foil bearing in enhancing load carrying capability

Cited by 7 publications

References 9 publications

A Review on Performance Characteristics of an Air Foil Thrust Bearing

A Review on Performance Characteristics of an Air Foil Thrust Bearing

Parametric Studies on Performance of Oil-Free Thrust Foil Bearings at Lower Speeds

Experimental and CFD analysis of a gas-lubricated foil thrust bearing for various foil configurations

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