Identification of the dynamic performance of a gas foil journal bearing operating at high temperatures

Sim, Kyuho; Lee, Yong-Bok; Song, Jin Woo; Kim, Jong Baeg; Kim, Tae Ho

doi:10.1007/s12206-013-0945-6

Cited by 27 publications

(16 citation statements)

References 15 publications

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“…High vibrations of the journal at a low rotational speed help to build a thin gaseous film, which can be used to reduce the moment of friction in the foil bearings during the run-up of the rotor. It was also noticed that at low rotational speed when there is no lubricating film yet, the vibration trajectories resemble the ones obtained in the study of the dynamic stiffness of the structural part of the foil bearing [16][17][18][19]. This is due to the fact that the systems studied in these two cases differed only in the way of vibration excitation.…”

Section: Discussionsupporting

confidence: 55%

Determination of the Lift-Off Speed in Foil Bearings Using Various Measurement Methods

Bagiński

Żywica

2018

Mechanics and Mechanical Engineering

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One of the most important parameters describing the operation of foil bearings is the speed at which—under certain load conditions—a lubricating film is created. Knowing the value of this parameter, one can determine the nature of the operation of a rotor that is supported by these bearings. The lift-off speed is usually determined during the run-up and coast down of the rotor using the measured moment of friction as a function of the rotational speed. In this article, this method has been compared with other measurement methods proposed by the authors. The first method consisted in recording the temperature of the bearing's top foil during its operation, while the second method was based on measuring the current-voltage characteristics of the electro-spindle used in the drive system. As a result of the conducted research, a simple method that allows determining the lift-off speed in foil bearings was proposed. This method can be applied to various types of high-speed machines, such as turbocompressors or microturbines.

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Section: Discussionsupporting

confidence: 55%

Determination of the Lift-Off Speed in Foil Bearings Using Various Measurement Methods

Bagiński

Żywica

2018

Mechanics and Mechanical Engineering

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“…On the one hand, the performance of bearing at different gas temperatures was studied in detail by some researchers such as in literature [5]; however, the dynamic limit performance was not fully considered in these investigations. On the other hand, a single fluid medium [18,19] was investigated in most studies, and there was a lack of systematic investigation on the temperature effect for gas bearing. Therefore, it was necessary to investigate the different types of gas systematically.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the flow characteristic of traditional gas bearing was simpler than that of microbearings due to its very small Knudsen number. In a more comprehensive research field concerning industrial application, some researchers [ 19 , 21 , 22 , 23 , 24 , 25 ] investigated the damage characteristic and the dynamic performance of gas bearing at high temperatures and developed the corresponding flow field temperature control strategy. However, their studied objects are mainly aimed at traditional gas bearing, and there were few literatures on the microbearings lubricated by gas.…”

Section: Introductionmentioning

confidence: 99%

Influence of Temperature Effect on the Static and Dynamic Performance of Gas-Lubricated Microbearings

Liu

Wang

et al. 2020

Micromachines

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Gas-lubricated microbearings are widely applied in multiple fields due to their advantages of high-speed, low friction level and other features. The operating environment of microbearings is complex, and the difference of temperature has an important influence on their comprehensive performance. In this investigation, FEM (finite element method) is employed to investigate the static, dynamic and limit characteristics of microbearings lubricated by different kinds of gas at different temperatures. The results show that the rise of temperature leads to the decline of equivalent viscosity of gas, which weakens the load capacity of microbearings, and furthermore, affects the operating stability of microbearings. The dynamic performances of microbearings at different temperatures are very different, and the two dynamic limit characteristics are more sensitive to temperature when it changes.

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“…When seizure occurred they found a remarkable reduction in bearing clearance as the rotor temperature increased. Sim, et al, (2014) performed an experimental investigation of the dynamic force performance of bump-type GFBs at high temperatures. The highest test heater temperatures were 400°C and the highest excitation frequencies were 180 Hz.…”

Section: Experimental Studies Of Thermal Characteristicsmentioning

confidence: 99%

Studies on thermal effects in aerodynamic foil journal bearings

Zhou

2016

JAMDSM

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With extensive application of foil gas journal bearings in high temperature conditions, the effect of increasing temperature on performance in the bearings have attracted more attention. High temperature can result in significant effects on static and dynamic characteristics and stability in foil gas journal bearings. In-depth understanding about thermal performance of foil bearings is in favor of structural optimization and developing more advanced foil bearings. This paper presents a short introduction about operational mechanisms and advantages of foil gas journal bearings firstly. Then, many works concerning thermal effects in foil gas journal bearings are detailedly reviewed. The problems that need to be improved or developed in the study of thermal effects of foil bearings are also presented, that is, accuracy and reliability of thermal predicting model, cooling methods and details of bearings and solid lubricant coatings which can be applied to a more wide temperature range.

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Identification of the dynamic performance of a gas foil journal bearing operating at high temperatures

Cited by 27 publications

References 15 publications

Determination of the Lift-Off Speed in Foil Bearings Using Various Measurement Methods

Determination of the Lift-Off Speed in Foil Bearings Using Various Measurement Methods

Influence of Temperature Effect on the Static and Dynamic Performance of Gas-Lubricated Microbearings

Studies on thermal effects in aerodynamic foil journal bearings

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