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Michel Fillon - One of the best experts on this subject based on the ideXlab platform.
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Large hydrodynamic Thrust Bearing: Comparison of the calculations and measurements
Proceedings of the Institution of Mechanical Engineers Part J: Journal of Engineering Tribology, 2014Co-Authors: Michał Wodtke, Michel Fillon, Andreas Schubert, Michał Wasilczuk, Piotr PajączkowskiAbstract:Hydrodynamic Thrust Bearings, used to carry axial loads in heavily loaded shafts of water power plants hydro turbines, can reach outer diameters even exceeding 5 m. In such large objects scale effect could be observed. According to this, allowable Bearing specific load assuring safe operation of the Bearings has to be decreased, which increases Thrust Bearing dimensions. This effect is caused by excessive thermal deflections of Bearing pads, which significantly change oil gap geometry, and in consequence, decreases Bearing load-carrying ability. Design of hydrodynamic Thrust Bearing of large dimensions seems to be a demanding engineering challenge, and additional difficulty comes from limited possibilities of experimental testing of these systems due to high costs. Theoretical investigations, carried out with the use of specially developed computer models, remain a feasible alternative for experimental research. But the accuracy of the models is not often directly validated, because of the lack of appropriate experimental data coming from large objects. In this paper, results of calculations carried out for a large hydrodynamic Thrust Bearing are shown and compared to measurement data obtained at Bearing commissioning stage. Pad temperatures profile sliding surface, oil pressure in hydrodynamic gap and film geometry are compared to the measured values. According to the presented comparisons, some conclusions are drawn with respect to the accuracy of models used to predict large Thrust Bearing performance.
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An Experimental Hydrodynamic Thrust Bearing Device and Its Application to the Study of a Tapered-Land Thrust Bearing
Journal of Tribology-transactions of The Asme, 2014Co-Authors: Y. Henry, J. Bouyer, Michel FillonAbstract:An experimental study is presented with the main objective of understanding the hydrodynamic behavior of a tapered-land Thrust Bearing with fixed geometry. The experimental results were obtained using an original test rig designed at the “Institut Pprime.” Extensive instrumentation applied to the Thrust Bearing allows a precise evaluation of various characteristics such as the temperature, the film thickness and the friction torque. The results are in good agreement with the findings of other surveys in the literature. However, large differences between the measured parameters were observed from one pad to another. The authors demonstrate that this is due to the imperfections on the active surface, produced during machining. For a better understanding of the influence of irregularities in the flatness, the test was repeated with a Thrust Bearing manufactured using a high-precision surface polishing process. Experimental results with respect to the real geometry of the Bearings were presented with both processes being compared. Interesting features, such as hot spots and a pressure peak, were identified on the pad at different supply temperatures and inlet pressures. This experimental study significantly advances the comprehension of the hydrodynamic behavior of tapered-land Thrust Bearings.
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Experimental Investigation in a Hydrodynamic Taper Land Thrust Bearing
ASME STLE 2012 International Joint Tribology Conference, 2012Co-Authors: Y. Henry, J. Bouyer, Michel FillonAbstract:An experimental study is presented with the main objective of understanding the hydrodynamic behavior of a taper land Thrust Bearing with fixed geometry. The experimental results were obtained on an original test rig designed at the Pprime Institute. An extensive instrumentation of the Thrust Bearing allows a precise evaluation of various elements such as the temperature, the film thickness or the friction torque. The results are in good agreement with other literature surveys. However, an important difference of the measured parameters was found between the pads. The authors consider that this is most probably caused by the imperfections of the active surface produced during machining.Copyright © 2012 by ASME
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Experiments on thermal effects in a hydrodynamic Thrust Bearing
Tribology International, 2000Co-Authors: A Dadouche, Michel Fillon, J.c BligoudAbstract:The objective of this work is to analyse the characteristics of a fixed-geometry Thrust Bearing in typical operating conditions and to give experimental results in order to validate future thermohydrodynamic models. The influence of the applied load, the rotational speed and the feeding temperature on the Thrust Bearing performance is presented and discussed.
Shigeka Yoshimoto - One of the best experts on this subject based on the ideXlab platform.
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static characteristics of a water lubricated hydrostatic Thrust Bearing using a membrane restrictor
Tribology International, 2014Co-Authors: Makoto Gohara, Kei Somaya, Masaaki Miyatake, Shigeka YoshimotoAbstract:Abstract It is well known that water does not pollute the environment as much as oil, but it has lower viscosity. We investigate the static characteristics of a water-lubricated hydrostatic Thrust Bearing using a membrane restrictor to achieve higher stiffness and lower power consumption at high speeds. The static characteristics of the proposed hydrostatic Thrust Bearing were studied numerically and experimentally for a nonrotating shaft. In the numerical calculations, the orifice effect was taken into account at the inlet of the viscous resistance area of the membrane restrictor. We found that the proposed water-lubricated hydrostatic Thrust Bearing could achieve a very high static stiffness by using the membrane restrictor, and the numerical and experimental results showed good agreement.
Wu Zhong-de - One of the best experts on this subject based on the ideXlab platform.
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Research of the Thrust Bearing with Balacing Plate Support
Large Electric Machine and Hydraulic Turbine, 2011Co-Authors: Wu Zhong-deAbstract:The Thrust Bearing with balacing plates support can be used in large rotated machine that support Thrust loads.Performance of the Thrust Bearing with balacing plate support was researched by theory calculation and test research.It's shown that the structure design is reasonable.Based on analysis of the test result,key factors for influence on Bearing performance were summarized.A new Bearing test device was designed,thus enriching the methods for researching Thrust Bearing.
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Temperature of Thrust Bearing Pad for Large Hydrogenerator
Large Electric Machine and Hydraulic Turbine, 2010Co-Authors: Wu Zhong-deAbstract:This paper presents the temperature of Thrust Bearing pad for hydrogenerator and characteristic of Thrust Bearing,and analyses it.Suggestions are given for the criterion of the temperature of Thrust Bearing.
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Analysis of Deformation of Double-disk Supported Thrust Bearing for Hydrogenerators
Large Electric Machine and Hydraulic Turbine, 2009Co-Authors: Wu Zhong-deAbstract:This paper presents a method for calculating heat conduction and thermo-elastic deformation of double-disk supported Thrust Bearing by means of ANSYS program.The three-dimension contact element and the three-dimension equivalent heat conduction element is located in space between sliding layer and load-carrying layer.The surface of sliding layer of Thrust Bearing with Babbitt layer is smaller convex.The surface of sliding layer of Thrust Bearing with Teflon layer is concave.
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Surface Shape of Thrust Bearing with Teflon Layer for Hydrogenerators
Large Electric Machine and Hydraulic Turbine, 2008Co-Authors: Wu Zhong-deAbstract:This paper presents a method for analyzing deformation of Thrust Bearing with Teflon layer for hydrogenerators and designing surface shape.Thermo-elastic-deformation of Thrust Bearing and runner(and Thrust head) are analyzed by means of the function of structural finite element program.The real thermo-elasto-hydrodynamic lubrication performance analysis of Thrust Bearings is achieved,and the surface shape design for the Thrust Bearing with Teflon layer is appropriate and working well.It is useful to the design of Thrust Bearing with Teflon layer.
Y. Henry - One of the best experts on this subject based on the ideXlab platform.
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An Experimental Hydrodynamic Thrust Bearing Device and Its Application to the Study of a Tapered-Land Thrust Bearing
Journal of Tribology-transactions of The Asme, 2014Co-Authors: Y. Henry, J. Bouyer, Michel FillonAbstract:An experimental study is presented with the main objective of understanding the hydrodynamic behavior of a tapered-land Thrust Bearing with fixed geometry. The experimental results were obtained using an original test rig designed at the “Institut Pprime.” Extensive instrumentation applied to the Thrust Bearing allows a precise evaluation of various characteristics such as the temperature, the film thickness and the friction torque. The results are in good agreement with the findings of other surveys in the literature. However, large differences between the measured parameters were observed from one pad to another. The authors demonstrate that this is due to the imperfections on the active surface, produced during machining. For a better understanding of the influence of irregularities in the flatness, the test was repeated with a Thrust Bearing manufactured using a high-precision surface polishing process. Experimental results with respect to the real geometry of the Bearings were presented with both processes being compared. Interesting features, such as hot spots and a pressure peak, were identified on the pad at different supply temperatures and inlet pressures. This experimental study significantly advances the comprehension of the hydrodynamic behavior of tapered-land Thrust Bearings.
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Experimental Investigation in a Hydrodynamic Taper Land Thrust Bearing
ASME STLE 2012 International Joint Tribology Conference, 2012Co-Authors: Y. Henry, J. Bouyer, Michel FillonAbstract:An experimental study is presented with the main objective of understanding the hydrodynamic behavior of a taper land Thrust Bearing with fixed geometry. The experimental results were obtained on an original test rig designed at the Pprime Institute. An extensive instrumentation of the Thrust Bearing allows a precise evaluation of various elements such as the temperature, the film thickness or the friction torque. The results are in good agreement with other literature surveys. However, an important difference of the measured parameters was found between the pads. The authors consider that this is most probably caused by the imperfections of the active surface produced during machining.Copyright © 2012 by ASME
Makoto Gohara - One of the best experts on this subject based on the ideXlab platform.
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static characteristics of a water lubricated hydrostatic Thrust Bearing using a membrane restrictor
Tribology International, 2014Co-Authors: Makoto Gohara, Kei Somaya, Masaaki Miyatake, Shigeka YoshimotoAbstract:Abstract It is well known that water does not pollute the environment as much as oil, but it has lower viscosity. We investigate the static characteristics of a water-lubricated hydrostatic Thrust Bearing using a membrane restrictor to achieve higher stiffness and lower power consumption at high speeds. The static characteristics of the proposed hydrostatic Thrust Bearing were studied numerically and experimentally for a nonrotating shaft. In the numerical calculations, the orifice effect was taken into account at the inlet of the viscous resistance area of the membrane restrictor. We found that the proposed water-lubricated hydrostatic Thrust Bearing could achieve a very high static stiffness by using the membrane restrictor, and the numerical and experimental results showed good agreement.
