Static performance of hydrostatic air bump foil bearing

Kumar, Manish; Kim, Daejong

doi:10.1016/j.triboint.2009.10.015

Cited by 22 publications

(6 citation statements)

References 11 publications

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“…Alternative hybrid air foil bearings combining hydrostatic injection with conventional AFB were also introduced [6][7][8][9]. The HAFB s combine the inherent hydrodynamic pressure of conventional AFBs with hydrostatic lift provided by pressurized air through orifices attached on the top foil to minimize dry rubbing during starts/stops.…”

Section: Hybrid Air Foil Bearingmentioning

confidence: 99%

“…The HAFB s combine the inherent hydrodynamic pressure of conventional AFBs with hydrostatic lift provided by pressurized air through orifices attached on the top foil to minimize dry rubbing during starts/stops. According to experimental studies of single pad HAFB with bump foils [7], HAras enhance load capacity significantly at low speeds and also have excellent thermal stability due to direct cooling effect on the journal shaft.…”

Section: Hybrid Air Foil Bearingmentioning

confidence: 99%

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Experimental Identification of Force Coefficients of Large Hybrid Air Foil Bearings

Wang

Kim

2013

Journal of Engineering for Gas Turbines and Power

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Foil bearing technology using air or gas as a lubricant has been around since the mid1960s, and it made significant progress in its reliability, performance, and applications. Even if significant progress has been made to the technology, the commercial applications to relatively large machines with journal shaft diameter bigger than 100 mm was not reported. This paper presents dynamic characteristics of a hybrid (hydrodynamic -\-hydrostatic) airfoil bearing (HAFB) with a diameter of 101.6mm and a length of 82.6 mm. The test rig configuration in this work is a floating HAFB on a rotating shaft driven by electric motor, and the HAFB is under external load. HAFB stiffness coefficients were measured using both (1) time-domain quasi-static load-deflection curves and (2) frequency-domain impulse responses, and HAFB damping coefficients were measured using only impulse responses. The HAFB direct stiffness coefficients measured from both methods are close to each other in the range of 4^7 MNIm depending on speed, load, and supply pressure, but frequency domain method shows larger scatter in the identified coefficients. HAFB coefficients simulated with the linear perturbation method using a bump stiffness matched to the load-deflection characteristics at 18,000 rpm show reasonably good agreements with experimentally measured values.

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Section: Hybrid Air Foil Bearingmentioning

confidence: 99%

Section: Hybrid Air Foil Bearingmentioning

confidence: 99%

Experimental Identification of Force Coefficients of Large Hybrid Air Foil Bearings

Wang

Kim

2013

Journal of Engineering for Gas Turbines and Power

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“…However, due to its physical property, fluorine rubber can not be used in extreme temperatures. Daejong Kim et al combined hydrostatic injection with conventional foil bearing to develop the hybrid foil bearing (Kumar and Kim, 2010). This hydrostatic supply gas ensures smooth running in avoidance of the dry rubbing and wear issues during the start-up and coast-down processes (Kim and Park, 2010).…”

Section: Introductionmentioning

confidence: 99%

Preliminary experimental study on static loading characteristics of multi-decked protuberant foil thrust bearing

Lai

Chen

et al. 2016

JAMDSM

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In the fluid film lubrication of high speed turbomachinery, bearing performance plays a significant role in the dynamics of the rotor-bearing system. In this paper, a novel foil thrust bearing using multi-decked protuberant foils as supporting structure is developed and tested. Experimental bearing test rig using gas-driven high speed turbo-expander is set up to evaluate static loading characteristics of the bearing. Static stiffness, friction torque, nominal bearing clearance and axial vibration amplitude are discussed in the transient processes. Static loading characteristic of the bearing is evaluated based on the relationship between displacement and loading force. Test results indicate that this simply configured thrust bearing has a good prospect in high speed hydrodynamic lubrication.

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“…However, oil film thickness changes with loads. Therefore, the maximum oil film thickness must be determined as well [4][5][6]. The application of the hydrostatic slide in ultra precision machine tools is also wide.…”

Section: Introductionmentioning

confidence: 99%

Research on the Control System of Lathe Open-type Hydrostatic Slide

Zhang

Wang

Peng

2022

J. Phys.: Conf. Ser.

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In order to make oil film thickness for lathe open-type hydrostatic slide stabilize and without changing following cutting forces, the lathe open-type hydrostatic slide was regarded as the research object. The equations of the control system of the oil film thickness for lathe open-type hydrostatic slide were established, which included the flow equations of slides and the force equations of dynamic slides. The control model of the control system of oil film thickness for lathe open-type hydrostatic slide was established. The parameters of the control model were determined through the identification and optimization, and its state space representation was derived. The PID control of the system was developed. The performance of the control system of oil film thickness had been significantly improved after the PID control. The static and dynamic performance of the system has further improved by conducting pole optimization allocation.

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Static performance of hydrostatic air bump foil bearing

Cited by 22 publications

References 11 publications

Experimental Identification of Force Coefficients of Large Hybrid Air Foil Bearings

Experimental Identification of Force Coefficients of Large Hybrid Air Foil Bearings

Preliminary experimental study on static loading characteristics of multi-decked protuberant foil thrust bearing

Research on the Control System of Lathe Open-type Hydrostatic Slide

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