On the manufacturing of compliant foil bearings

Shalash, Karim; Schiffmann, Jürg

doi:10.1016/j.jmapro.2016.12.021

Cited by 37 publications

(25 citation statements)

References 56 publications

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“…Foil GBs [11,52] generally require special coatings on the surfaces of foils and rotors to minimize wear at the start and stop. High standards are imposed to the tolerances on the foil thickness as well as on the forming of bumps to avoid effects of manufacturing deviation on the bearing performance [70]. Compliant GBs are often encountered in air cycle compressors for aircraft environmental control, turbocompressor and turboexpanders in cryogenic industry, turbochargers and small scale gas turbine engines and for air management of fuel cells [71].…”

Section: Figure 3 An Overview Of Typical Gb Types Categorized By Rigimentioning

confidence: 99%

A Review of Grooved Dynamic Gas Bearings

Guenat

Schiffmann

2019

Applied Mechanics Reviews

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This paper offers an extensive review of publications dealing with the modeling, the design, and the experimental investigation of grooved dynamic gas-lubricated bearings. Recent years have witnessed a rise in small-scale and high-speed turbomachinery applications. Besides the well-known gas foil bearings, grooved bearings offer attractive advantages, which unveil their potential in particular at small scale due to the structural simplicity as well as satisfying predictability. This paper starts with a general background of the application of gas-lubricated bearings and introduces and compares the different gas bearing topologies. Further, the state-of-the-art modeling of grooved gas-lubricated bearings is introduced, systematically assessing the advantages and inconveniences of two major approaches, i.e., the narrow groove theory (NGT) and direct discretization method. Since the NGT method is an elegant and efficient approach to model the complex effects of periodic grooves, a critical section is dedicated to the NGT. In a second phase, different models to include additional physical phenomena such as real gas lubrication, rarefaction, or turbulence effects are reviewed. The paper concludes with a critical assessment of the state-of-the-art and indicates potential fields of research that would allow to shed more light into the understanding of these bearings, as well as with some thoughts on the integrated design methodologies of gas bearing supported rotors.

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Section: Figure 3 An Overview Of Typical Gb Types Categorized By Rigimentioning

confidence: 99%

A Review of Grooved Dynamic Gas Bearings

Guenat

Schiffmann

2019

Applied Mechanics Reviews

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“…The roller diameter is taken slightly lesser than bearing diameter as the Be-Cu material tends to spring back after the release of load. 19,20 Once both the bump foil and encircling foil are formed, they are assembled in the metal housing to make the bump foil bearing. The inner diameter of the bearing housing is obtained by algebraically adding the bump height, encircling foil thickness, and desired clearance.…”

Section: Foil Bearing Developmentmentioning

confidence: 99%

Influence of geometric parameters on the bump foil bearing performance

Kulkarni

Jana

2019

Proceedings of the Institution of Mechanical Engineers, Part J:

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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 with given dimensions, clearance governs the magnitude of pressure developed, whereas stiffness dictates the change in radial clearance under the generated pressure. This article deals with the effect of stiffness, clearance, and its interaction on the bump foil bearings load-carrying capacity. For this study, four sets of foil bearings of the same geometry with two levels of stiffness and clearance values are fabricated. Experiments are carried out following two factor-two level factorial design approach under constant load and in each case, the lift-off speed is measured. The experimental output is analyzed using statistical techniques to evaluate the influence of parameters under consideration. The results indicate that clearance has the maximum influence on the lift-off speed/ load-carrying capacity, followed by interaction effect and stiffness. A regression model is developed based on the experimental values and model is validated using error analysis technique.

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“…As it was mentioned earlier, the construction of GFBs consists of a system of thin foils. The role of the foils is to introduce additional compliance into the system [4][5]. This feature makes the GFBs able to better handle changing operational conditions, improves dynamic parameters of the system and forgives slight misalignment of the shaft.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional bushing for gas foil bearing - test rig architecture and functionalities

2021

IJM

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The following content refers to the thermal aspects of Gas Foil Bearing (GFB). The GFBs are the subgroup of journal bearings, for which lubrication is provided by air, instead of 'traditional' lubricants like oil, graces etc. Gas Foil Bearings offer specific features unachievable for traditional bearings. GFB can operate with rotating speed up to several dozens of krpm in extreme temperature up to hundreds of Celsius degrees. However due to their specific construction, GFBs are prone to specific thermal issues which complicate their design process. Until now, many tools, mainly based on numerical models were developed. Their effectiveness is evaluated based on experimental data. Due to the high complexity of GFB's structure, the temperature measurement is a challenging task and so far, no reliable simple technique was proposed. There is still a need for developing reliable measurement techniques, allowing for precise temperature measurement. This paper presents the novel approach to temperature measurement of the GFBs compliant structure. The unique concept of foil with integrated sensors was presented and described in detail.

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On the manufacturing of compliant foil bearings

Cited by 37 publications

References 56 publications

A Review of Grooved Dynamic Gas Bearings

A Review of Grooved Dynamic Gas Bearings

Influence of geometric parameters on the bump foil bearing performance

Multifunctional bushing for gas foil bearing - test rig architecture and functionalities

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