Bibliografías temáticas / Bearings (Machinery)

Literatura académica sobre el tema "Bearings (Machinery)"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 5 de marzo de 2023

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Artículos de revistas sobre el tema "Bearings (Machinery)"

1

Vekteris, Vladas, Andrius Trumpa, Vytautas Turla, Vadim Mokšin, Gintas Viselga y Eugenijus Jurkonis. "Diagnosing faults in rolling-element bearings of rotor systems equipped with vibration dampers". Advances in Mechanical Engineering 12, n.º 4 (abril de 2020): 168781402091541. http://dx.doi.org/10.1177/1687814020915417.

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This article considers problems arising from conventional techniques used to diagnose faults in the rolling-element bearings of rotor-bearing systems, with dampers used in centrifugal milk processing machinery. Such machines include milk separators and related processing machinery. The article asserts that where the rotor-bearing system is equipped with vibration dampers, conventional fault diagnostic measurements produce inadequate results. Hence, for rotor-bearing systems of this type, this article suggests a different way to diagnose faults in bearings and monitor conditions.
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2

Goodwin, M. J., P. J. Ogrodnik, M. P. Roach, L. K. Lim y Y. Fang. "Steady Load-Carrying Capacity of Recessed Hydrodynamic Bearings". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 209, n.º 4 (diciembre de 1995): 255–62. http://dx.doi.org/10.1243/pime_proc_1995_209_436_02.

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Oil-film hydrodynamic bearings are one of the most common forms of bearing used in rotating machinery. Because of their effect on system unbalance response and stability, care has to be exercised in the design of machines running in hydrodynamic bearings—for example they cannot usually be used in machines operating at high rotational speeds when the steady load on the bearing is low. A novel form of hydrodynamic bearing which incorporates recesses in the bearing surface has been proposed by the authors which improves the dynamic characteristics; however, earlier work has not fully assessed the steady load characteristics of such bearings vis-à-vis conventional bearings for example. The aim of this paper is to present the results of experimental work on several designs of the proposed novel bearings, to assess the bearing's performance and to compare it with that of conventional bearings. The results of the work show that the steady load-carrying capacity is adversely affected by the inclusion of recesses in the bearing surface, but that this is only a marginal effect provided that the number of recesses and their geometry are selected with care.
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Dewrance, John. "MACHINERY BEARINGS". Journal of the American Society for Naval Engineers 9, n.º 1 (18 de marzo de 2009): 104–17. http://dx.doi.org/10.1111/j.1559-3584.1897.tb00708.x.

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Ramos, Leandro Ito, Douglas Jhon Ramos y Gregory Bregion Daniel. "Evaluation of textured journal bearings under dynamic operating conditions in rotating machinery". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, n.º 6 (5 de noviembre de 2019): 842–57. http://dx.doi.org/10.1177/1350650119887568.

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In order to obtain rotating machinery with improved energy efficiency, the approach of surface texturing journal bearings has been adopted to reduce the viscous dissipation in the lubricant. A possible reduction in shear viscous forces in the bearings of rotating machines could reduce the amount of heat released along its operation, resulting in a lower operating temperature that tends to improve journal bearings performance and the machine’s energetic efficiency. Thus, this work aims to investigate the texturing of journal bearings under dynamic loading conditions, considering the application in rotating systems. For this, computational simulations are performed through a rotating system model constructed by means of the finite element method in which the hydrodynamic journal bearings that support the rotor are modeled by Reynolds’ equation using the finite volume method and the full multigrid technique. The numerical results show that textured journal bearings can be applied to rotating machines, providing reductions in shear viscous forces. However, the magnitude of this reduction should be carefully evaluated, as the Reynolds cavitation model was applied to ensure a lower computational spent time and thus enable the simulations involved in this study. The novelty of this study is related to determining the appropriate distributions and geometric parameters of the textures for the journal bearing under dynamic load condition considering its equivalent static load condition what tends to drastically reduce computational time to perform this procedure, representing an important alternative for industrial application.
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5

Ravikumar, R. N., K. J. Rathanraj y V. Arun Kumar. "Experimental Studies on Air Foil Thrust Bearing Load Capabilities Considering the Effect of Foil Configuration". Applied Mechanics and Materials 813-814 (noviembre de 2015): 1007–11. http://dx.doi.org/10.4028/www.scientific.net/amm.813-814.1007.

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Abstract. Foil bearings are self-acting hydrodynamics bearings used to support lightly loaded high speed rotating machinery. The advantages that they offer to process fluid lubricated machines usingworking fluid as a lubricant (ambient air) physically non-contacting high speed operation. Foil bearings have been considered as an alternative to conventional bearings with the capacity to cater for high-speeds and hostile environment (high temperature). However, the lack of load carrying capacity at relatively lower speeds limits their applications in heavy turbo machinery and as such are highly suitable in lightly loaded, high speed turbo machinery like small gas turbines.This paper discusses the design and assessment of dynamic characteristics in terms of load carrying capabilities as a function of speed, gap between the bearing and the runner as well as shape of foils for an air foil thrust bearing. The effects of various bearing parameters like foil thickness, number of foils fixed circumferentially and along the axis of rotation and with foil geometry configuration. Characteristics of performance defined essentially in terms of load carrying capabilities and static stiffness have been used for evaluation. Experiments were conducted both for angular foils (with inner edge height less than outer edge height) and square foils by varying number of foils. The experimental results shows that the effect of foil configuration enhances the load carrying capabilities of air foil thrust bearing.
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6

Tulupov, Viktor D., Mikhail A. Sleptsov y Aleksandrs A. Briedis. "Ways to Improve the Reliability of Bearings in Traction Induction Machines". Vestnik MEI 2, n.º 2 (2021): 60–70. http://dx.doi.org/10.24160/1993-6982-2021-2-60-70.

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The problem of electric rolling stock traction machinery failures caused by electrical erosion of bearings is addressed. Damages inflicted to traction machinery bearings as a result of electric current flowing through them have been known since long ago. In recent time, however, damages of this kind have become more frequent, because frequency and voltage converters for control of three-phase inductor motors are widely used in the electric rolling stock. An overview of factors causing the occurrence of stray currents generated in frequency converter driven traction motors and sources of these currents is presented. Electric current flows through rolling bearings in the area of the contact between the rolling elements with inner and outer rings, thus causing damage to the bearing metal components' rolling surfaces and degrading the quality of lubricants. To study and analyze the currents through bearings, the stray capacitances existing in traction machines are determined, and their calculation methods are defined, the necessity of which is stemming from the fact that these capacitances influence the generation of parasitic currents. The stray capacitances in traction machines include the capacitance between the stator windings and the stator core pack, the capacitance between the stator windings and the rotor, the capacitance between the rotor and the stator core pack, and the capacitances of the bearings. From the electrical point of view, bearings may also be regarded as capacitances. As long as there is a continuous lubricant film between the inner ring and outer rings and the rolling elements, the bearings behave as capacitors. A difference of potentials across the bearing elements may lead to electrostatic discharges and, hence, to discharge currents through the bearings. One of possible ways to enhance the reliability of traction machine bearing units is to use insulated bearings. The change in the impedance of bearings with ceramic coating and hybrid rolling elements depending on the applied voltage frequency and operating temperature is calculated and analyzed. Conclusions regarding the expediency of using hybrid bearings having rings made of bearing steel and rolling elements made of bearing silicon nitride (Si3N4) are drawn.
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7

Hou, Yu, Qi Zhao, Yu Guo, Xionghao Ren, Tianwei Lai y Shuangtao Chen. "Application of Gas Foil Bearings in China". Applied Sciences 11, n.º 13 (5 de julio de 2021): 6210. http://dx.doi.org/10.3390/app11136210.

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Gas foil bearing has been widely used in high-speed turbo machinery due to its oil-free, wide temperature range, low cost, high adaptability, high stability and environmental friendliness. In this paper, state-of-the-art investigations of gas foil bearings are reviewed, mainly on the development of the high-speed turbo machinery in China. After decades of development, progress has been achieved in the field of gas foil bearing in China. Small-scale applications of gas foil bearing have been realized in a variety of high-speed turbo machinery. The prospects and markets of high-speed turbo machinery are very broad. Various high-speed turbomachines with gas foil bearings have been developed. Due to the different application occasions, higher reliability requirements are imposed on the foil bearing technology. Therefore, its design principle, theory, and manufacturing technology should be adaptive to new application occasions before mass production. Thus, there are still a number of inherent challenges that must be addressed, for example, thermal management, rotor-dynamic stability and wear-resistant coatings.
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8

Deng, Linfeng, Aihua Zhang y Rongzhen Zhao. "Intelligent identification of incipient rolling bearing faults based on VMD and PCA-SVM". Advances in Mechanical Engineering 14, n.º 1 (enero de 2022): 168781402110729. http://dx.doi.org/10.1177/16878140211072990.

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Rolling bearings are the key components of rotating machinery. Incipient fault diagnosis of bearing plays an increasingly important role in guaranteeing normal and safe operation of rotating machinery. However, because of the high complexity of the fault feature extraction, the incipient faults of rolling bearings are difficult to diagnose. To solve this problem, this paper presents a new incipient fault intelligent identification method of rolling bearings based on variational mode decomposition (VMD), principal component analysis (PCA), and support vector machines (SVM). In the proposed method, the bearing vibration signals are decomposed by using VMD, and a series of intrinsic mode functions (IMFs) with different frequencies are obtained. Then, the energy and kurtosis values of each IMF are calculated to reveal the intrinsic characteristics of the vibration signals in different scales. Finally, all energy and kurtosis values of IMFs are processed via PCA and subsequently fed into SVM to achieve the bearing fault identification automatically. The effectiveness of this method is verified through the experimental bearing data. The verification results indicate that the proposed method can effectively extract the bearing fault features and accurately identify the bearing incipient faults, and outperform the two compared methods obviously in identification accuracy and computation time.
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9

Guo, Caiping. "Optimal Design of Sliding Bearings Based on Artificial Intelligence Algorithm and CFD Simulation". Wireless Communications and Mobile Computing 2022 (12 de abril de 2022): 1–11. http://dx.doi.org/10.1155/2022/5448332.

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Sliding bearings have a long history, simple manufacturing, and low cost. However, the function of sliding bearings is very large. As a key component of rotating machinery, thrust sliding bearing is directly related to the overall performance of the machine. The machines that can be seen in life, whether simple or complicated, have been used. However, with the development of science and technology and economy, all kinds of new things have been inoculated. One of the current issues is how sliding bearings can continue to keep machinery stable. CFD is the abbreviation of English computational fluid dynamics (computational fluid dynamics). It is developed with the development of computer technology and numerical computing technology. Simply put that CFD is equivalent to “virtually” doing experiments on the computer to simulate the actual fluid flow. The purpose of this article is to study the optimal design of sliding bearings by artificial intelligence algorithms and CFD simulation. This paper uses intelligent design methods to optimize the appearance, shape, and manufacturing process of sliding bearings and to carry the bearing capacity, friction coefficient and temperature rise of sliding bearings. Comprehensive research then establishes the objective function. The finite element algorithm, genetic algorithm, and matrix theory are used to calculate the stability of the sliding bearing under various conditions. The artificial intelligence algorithm is used to sort the calculated data. The CFD simulation is used to obtain the most reasonable result. Algorithm, as well as the appearance, shaft diameter, and material of the plain bearing, maintains stability under various conditions. The experimental data show that the classification using artificial intelligence algorithms and CFD simulation can significantly improve the performance of sliding bearings. It is found that the relationship between the sliding bearings is related to the speed, the diameter of the bearing, and other factors. Experimental data show that artificial intelligence algorithms and CFD simulation can provide reliable data references for the optimal design of sliding bearings, and the optimized sliding bearings can meet the stability under relevant conditions.
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10

Du, Fengming, Dawei Li, Xiaoxia Sa, Cong Li, Yang Yu, Chengdi Li, Jingsi Wang y Weiwei Wang. "Overview of Friction and Wear Performance of Sliding Bearings". Coatings 12, n.º 9 (5 de septiembre de 2022): 1303. http://dx.doi.org/10.3390/coatings12091303.

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Sliding bearings are critical components of the internal combustion engine. Friction and wear occur in the contact area between the shaft and the bearing. Significant wear can occur in poor working conditions or after a long service time, leading to the failure of the sliding bearing and affecting the reliability of the machinery. It is essential to investigate the wear performance of sliding bearings, understand their wear mechanism, predict their service life, and select wear-resistant materials and surface treatments. This paper reviews the current status and prospects of sliding bearing wear research, focusing on the classification of sliding bearing wear tests, wear testing machines, wear test research, wear prediction models, and future research prospects.
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Tesis sobre el tema "Bearings (Machinery)"

1

Li, Yawei. "Dynamic prognostics of rolling element bearing condition". Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/15847.

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Zhang, Cheng. "Defect detection and life prediction of rolling element bearings". Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17658.

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Frew, David Anthony. "The design, development and vibration analysis of a high-speed aerostatic bearing". Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/362.

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Jakeman, R. W. "Analysis of dynamically loaded hydrodynamic journal bearings with particular reference to misaligned marine sterntube bearings". Thesis, Nottingham Trent University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233019.

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Pu, Guang. "Hybrid air bearings for high speed turbo machinery". Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7789/.

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This PhD project is set out to develop a type of hybrid journal air bearings with reduced reliance on the supply of compressed air for mobile turbomachinery applications. The research work covers hydrostatic and hybrid journal air bearings with non-compliant clearance boundaries. The approach adopted combined numerical analysis based on CFD and experimental verification of the designs. The research can be divided into three sections. In the first section, numerical approaches to model hydrostatic and hybrid journal air bearings with a fixed clearance boundary were developed based on finite difference method (FDM) and finite volume method (FVM) respectively. In the second and third section, theoretical and experimental studies were performed on hydrostatic and hybrid journal air bearings. Performance of the bearings was investigated in non-rotational and rotational conditions. The analysis on stability and natural frequencies of rotor bearing system was performed using the linear bearing model. The unbalance responses of the rotor in the test rig were predicted using non-linear transient analysis and measured experimentally from 50k rpm to 120k rpm in rotor speed. Through the theoretical and experimental investigations of the hybrid journal air bearings, the objectives of the project have been implemented and the aims have been met.
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6

Mur, Miranda José Oscar 1972. "Feasibility of electrostatic bearings for micro turbo machinery". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/9823.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.
Includes bibliographical references (p. 97-98).
by José Oscar Mur Miranda.
M.Eng.
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7

Roach, Christopher James. "Development of porous ceramic air bearings". Thesis, Cranfield University, 2001. http://dspace.lib.cranfield.ac.uk/handle/1826/3693.

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Porous air bearings enjoy some important advantages over conventional air bearing types such as increased load carrying capacity, higher stiffness and improved damping. However, these types of bearings have yet to find widespread acceptance due to problems with obtaining materials with consistent permeability, instability issues relating to the volume of gas trapped at the bearing surface in the pores, and manufacturing the bearing without altering the permeability. Using a series of fine grades of alumina powder to minimise surface pore volume it has been demonstrated that it is possible to consistently and reproducibly manufacture porous bearings by injection moulding and slip casting. The relationship between powder size, processing conditions, porosity, mechanical properties and fluid flow characteristics were experimentally determined. The temperature of processing and the green density were found to be the controlling parameters in the resulting fluid flow properties for a given powder size, Test bearings were produced from the range of processing conditions investigated. It was found that the fine powder size bearings were stable over the entire range of test conditions irrespective of their initial manufacturing route. The most important consideration for the bearing performance was the quality of manufacture. The bearings were found to be sensitive to the flatness of their working surface and quality of fit in their test holder. The bearings were compared with published theories for load capacity and stiffness. A reasonable agreement was found with load carrying capacity once a correction for surface roughness was incorporated. Stiffness predictions provided a useful tool for the analysis and prediction of properties such as optimum values of permeability for a given geometry, if certain allowances are made.
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Chong, F. S. "Variation analysis of hybrid bearings". Thesis, Liverpool John Moores University, 1985. http://researchonline.ljmu.ac.uk/5560/.

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Lin, Juhn-Shyue. "Experimental analysis of dynamic force transmissibility through bearings". Connect to resource, 1989. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1207597697.

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Stack, Jason R. "Fault signature detection for rolling element bearings in electric machines". Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/13276.

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Libros sobre el tema "Bearings (Machinery)"

1

I͡U︡, I͡U︡rkauskas A. y Rivin Eugene I, eds. Vibration of bearings. New York: Hemisphere Pub. Corp., 1989.

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J, Neale M. y Society of Automotive Engineers, eds. Bearings. Warrendale, PA: Society of Automotive Engineers, 1993.

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International Off-Highway & Powerplant Congress & Exposition (1985 Milwaukee, Wis.). Bearing technology: Analysis, development, and testing. Warrendale, PA: Society of Automotive Engineers, 1985.

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Jean, Frène, ed. Hydrodynamic lubrication: Bearings and thrust bearings. Amsterdam [Netherlands]: Elsevier, 1997.

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5

Niculae, Constantinescu Virgiliu, ed. Sliding bearings =: Lagăre cu alunecare. New York: Allerton Press, 1985.

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Wolfgang, Kauschke, ed. Structural bearings. Berlin: Ernst & Sohn, 2002.

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7

Kiciński, Jan. Teoria i badania hydrodynamicznych poprzecznych łożysk ślizgowych. Wrocław: Zakład Narodowy im. Ossolińskich, 1994.

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8

Commission, United States International Trade. Antifriction bearings (other than tapered roller bearings) and parts therefor from the Federal Republic of Germany, France, Italy, Japan, Romania, Singapore, Sweden, Thailand, and the United Kingdom: Determinations of the Commission in investigations nos. 303-TA-19 and 20 (preliminary) under the Tariff Act of 1930, together with the information obtained in the investigations; determinations of the Commission in investigations nos. 731-TA-391-399 (preliminary) under the Tariff Act of 1930, together with the information obtained in the investigations. Washington, DC: U.S. International Trade Commission, 1988.

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Radin, Alexander. Miniature bearings research and development in the Soviet Union. Falls Church, VA (7700 Leesburg Pike, Falls Church 22043): Delphic Associates, 1986.

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Tapered roller bearings and parts thereof, and certain housings incorporating tapered rollers from Hungary, Italy, Japan, the People's Republic of China, Romania, and Yugoslavia: Determinations of the Commission in investigations nos. 731-TA-341 through 346 (preliminary) under the Tariff Act of 1930, together with the information obtained in the investigations. Washington, DC: U.S. International Trade Commission, 1986.

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Capítulos de libros sobre el tema "Bearings (Machinery)"

1

Matsushita, Osami, Masato Tanaka, Masao Kobayashi, Patrick Keogh y Hiroshi Kanki. "Basics of Plain Bearings". En Vibrations of Rotating Machinery, 19–40. Tokyo: Springer Japan, 2019. http://dx.doi.org/10.1007/978-4-431-55453-0_2.

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Matsushita, Osami, Masato Tanaka, Masao Kobayashi, Patrick Keogh y Hiroshi Kanki. "Vibration of Rolling Element Bearings". En Vibrations of Rotating Machinery, 87–114. Tokyo: Springer Japan, 2019. http://dx.doi.org/10.1007/978-4-431-55453-0_5.

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Matsushita, Osami, Masato Tanaka, Masao Kobayashi, Patrick Keogh y Hiroshi Kanki. "Stability of a Rotor in Plain Bearings". En Vibrations of Rotating Machinery, 59–86. Tokyo: Springer Japan, 2019. http://dx.doi.org/10.1007/978-4-431-55453-0_4.

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Matsushita, Osami, Masato Tanaka, Masao Kobayashi, Patrick Keogh y Hiroshi Kanki. "Unbalance Vibration of a Rotor in Plain Bearings". En Vibrations of Rotating Machinery, 41–57. Tokyo: Springer Japan, 2019. http://dx.doi.org/10.1007/978-4-431-55453-0_3.

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Adams, Maurice L. "Water-Lubricated High-Speed Bearings". En Rotating Machinery Research and Development Test Rigs, 137–43. Boca Raton : Taylor & Francis, CRC Press, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315116723-14.

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Holmes, R. "On Bearing Deformation and Temperature Distribution in Dynamically-Loaded Engine Bearings". En Vibration and Wear in High Speed Rotating Machinery, 385–98. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1914-3_22.

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Vermeulen, M. "Dynamic Behaviour of Hydrostatic Radial Bearings". En Vibration and Wear in High Speed Rotating Machinery, 455–70. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1914-3_26.

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Diana, G., F. Cheli, A. Manenti y F. Petrone. "Non Linear Effects in Lubricated Bearings". En Vibration and Wear in High Speed Rotating Machinery, 567–79. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1914-3_33.

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Lund, J. W. "Dynamic Coefficients for Fluid Film Journal Bearings". En Vibration and Wear in High Speed Rotating Machinery, 605–16. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1914-3_36.

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Kaneko, Masahiro, Yoichi Nakamura, Koji Miyazaki y Hiroshi Tsukamoto. "Multi-Objective Optimization of Blood-Pump with Conical Spiral Groove Bearings". En Fluid Machinery and Fluid Mechanics, 285–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89749-1_43.

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Actas de conferencias sobre el tema "Bearings (Machinery)"

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Bently, Donald E., John W. Grant y Phillip C. Hanifan. "Active Controlled Hydrostatic Bearings for a New Generation of Machines". En ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0354.

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This paper presents a revolutionary approach of using a fluid-lubricated bearing for both traditional functions (load support, damping, and heat removal) and to actively control the rotor dynamics of rotating machinery. We will discuss how its use in the design of next generation turbomachinery can yield dramatic benefits. This includes an increase in efficiency, operational life, fault diagnostic, and reductions in machine size, weight, and cost. With the use of hydrostatic instead of hydrodynamic lubrication, traditional lubricants can be replaced by fluids more friendly to the process and environment. In this paper a comparison between the new hydrostatic bearing (Bently ServoFluid™ Control Bearing) and active magnetic bearings (AMB) will be presented. The Bently ServoFluid™ Control Bearing is an active controlled externally pressurized (a hybrid hydrostatic) bearing using fluid restoring force to compensate for rotor-related forces. It has the positive features of rolling element, fluid film and magnetic bearings with fewer negative attributes. The fluid restoring forces provide static and dynamic motion control similar to magnetic bearings, but with significantly larger compensation forces and with higher stiffness control. This revolutionary approach enables machinery owners to identify, understand and compensate for rotor system forces, an improvement over simply using vibration (motion) information for machinery diagnostics. This allows more complete diagnostics and prognostics of machine health. The bearing can be used to apply known perturbation forces to the rotor. Perturbation forces enable the determination of rotor system stiffness, and subsequent changes, thus improving machinery diagnostics. It can also provide information, such as the mechanical parameters governing the motion, system linearity, and stability margins for more accurate modeling of machines. Test results will be included to show experimentally determined transfer functions of each of the control loop elements, and predicted rotor forces. A typical root locus plot will be shown demonstrating how the characteristics change with bearing stiffness. Prototype machines, with both low viscosity fluid (water) and typical viscous fluid (T-10 turbine oil), have been built, tested, and successfully operated.
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Kirk, R. G., E. J. Gunter y W. J. Chen. "Rotor Drop Transient Analysis of AMB Machinery". En ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84272.

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A major limitation of AMB supported machinery is their dependence on auxiliary or backup bearings in the event that the magnetic bearings lose power due to control system failure. These backup bearings should be designed to withstand the severe loads encountered after the AMB failure when the rotor drops onto them. This has prompted the development of general purpose finite element based, non-linear transient analysis programs capable of evaluating shock loading, blade loss and rotor drop phenomena experienced in rotors supported by AMBs. Previous testing and results have been made for a single AMB drop or both AMBs of a two bearing rotor. The current interest also includes the multiple AMB supported machinery systems, i.e., systems with more than two AMB or auxiliary bearings. This paper reviews the method of rotor drop analysis for AMB bearing systems. A commercially available program, DyRoBeS, is then applied to four different rotor designs to evaluate their rotor drop transient response. The total power loss rotor drop results of four different rotor systems will be discussed for assumed backup bearing conditions.
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Ghalamchi, Behnam, Jussi T. Sopanen y Aki M. Mikkola. "Dynamic Model of Spherical Roller Bearing". En ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12102.

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Rolling element bearings are essential machine elements in the rotating machinery. Extensive research has been conducted to study the dynamics of ball bearings, while studies related to spherical roller bearings are short-shrifted. On the other hand, the number of industrial applications that utilize spherical roller bearings has been increasing constantly. This is due to self-aligning nature and high-load capacity of spherical roller bearings. Typical applications are paper machines, steel rolling, marine equipment, geared transmissions and modern high power wind turbines. This study introduces a three-degree-of-freedom spherical roller bearing model that is computationally efficient, and it is designed to be used in the transient simulations of complete rotor-bearing systems. In the proposed model, the bearing forces are calculated as a function of contact deformation and bearing geometry parameters according to the non-linear Hertzian contact theory. In the numerical results, the important bearing design parameters such as diametral clearance, number of rollers and osculation are studied. Existence of varying compliance (VC) vibrations and the capability of the proposed model in the transient simulations of rotor-bearing systems are demonstrated. The bearing model is verified by using commercial bearing analysis software. Future improvements and model extension possibilities are also discussed.
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Ochiai, Masayuki y Hiromu Hashimoto. "Experimental Study of Stabilisation of Small Size Journal Bearing With Oil Supply Groove by Using Starved Lubrication and Bearing Orientation Angle Change". En ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44070.

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Journal bearings are widely used for supporting high speed rotating machinery such as turbine, compressor and HDD spindle etc, because of their high load carrying capacity, stability and durability. Recently, the engineering trend is oriented to higher speed and smaller sizes of rotating machinery, and then it is important to enhance stabilities for the journal bearings. Tilting pad journal bearing is generally used for high-speed rotating machineries because of their advantages of stabilization. However, there are some problems using for compact size rotating machineries for their high manufacturing cost and complicated structure. Therefore, it is necessary to enhance the stability of more simple bearings compared with tilting pad bearing in order to use for small size rotating machinery. This paper describes the stabilization method of journal bearing based on the combination mechanism with starved lubrication and orientation angle change. From the results of stability experimental study of journal bearings, it is clarified that the stabilization of bearings is improved drastically by using above techniques.
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Srinivasan, Sriram, Eric H. Maslen y Lloyd E. Barrett. "Optimization of Bearing Locations for Rotor Systems With Magnetic Bearings". En ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-217.

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This paper presents a method for quickly evaluating the effect of changes in bearing location on bearing design for stability of rotating machinery. This method is intended for use by rotating machinery designers to select the “best” bearing locations prior to the bearing design process. The purpose of the method is to improve the design process by separating the problem of determining the “best” bearing locations from that of determining the actual bearing design. The method is independent of the type of bearing employed. For each candidate bearing configuration, the method provides a scalar measure of the relative ability of bearings to meet stability specifications. Within certain limits, the stability specifications are defined by the designer. The scalar measure is used to rank the candidate bearing locations and thereby select the best one. The scalar measure is compared to a practical measure of magnetic bearing design such as the infinity norm of the controller for an example design of a multi-stage centrifugal compressor.
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Swanson, E. E. y H. Heshmat. "Oil-Free Foil Bearings as a Reliable, High Performance Backup Bearing for Active Magnetic Bearings". En ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30291.

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Gas turbine engines and other high speed rotating machinery supported by magnetic bearings require some form of backup bearing to ensure reliable and safe operation. To date, this backup capability has been provided by either rolling element bearings or solid lubricated bushings. Both of these solutions have drawbacks — must notably limited life and uncertain dynamic performance. In many cases, the backup bearing system requires substantial maintenance following an activation event. An alternative approach investigated in this work is the use of a compliant foil bearing as a backup bearing. This work discusses tests of this concept on a test rig with a 63 kg rotor. In this application, the foil bearing demonstrated smooth, stable operation during a variety of simulated magnetic bearing failure events, and allowed for continued operation of the rotor following the simulated failures.
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Tian, Jiale, Baisong Yang, Lie Yu y Jian Zhou. "Study on Dynamic Performance of the Non-Circular Bearings Using Fourier Analysis". En ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88420.

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Journal bearing is one of the most important components for supporting high speed rotating machinery such as compressors and turbo machines. In recent trends, non-circular journal bearings (lemon bearing, three-lobe bearing, four-lobe bearing, etc.), for their greater load capacity and better stability, have become a superior choice and found wide spread application. In this paper, the nonlinear oil film force is expressed using the dynamic stiffness and damping of 1st-3rd order. And the film thickness and pressure are analyzed using Fourier method, so that the corresponding harmonic components and their deeper connection can be further explored. The paper shows that the nonlinear dynamic performances are connected closely with the bearings’ profile, and lays the foundation for expressing the precise nonlinear oil film force.
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Choy, F. K., J. Zhou, M. J. Braun y L. Wang. "Vibration Monitoring and Damage Quantification of Faulty Ball Bearings". En ASME/STLE 2004 International Joint Tribology Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/trib2004-64142.

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More often then not, the rolling element bearings of rotating machinery are the mechanical components that are first prone to premature failure. Early warning of an impending bearing failure is vital to the safety and reliability of high-speed turbo-machinery. Presently, vibration monitoring is one of the most applied procedures in on-line damage and failure monitoring of rolling element bearings. This paper presents results from an experimental rotor-bearing test rig where quantified damage was induced in the supporting tapered ball bearings. Subsequently the vibration signature due to damage at the inner race of the bearing is examined. Four on-line vibration signature analyzing schemes are used concomitantly: (i) time averaging, (ii) frequency domain analysis, (iii) joint time-frequency analysis (Wigner-Ville and wavelet transforms) and (iv) chaotic vibration analysis (modified Poincare diagrams). The size/level of the damage is corroborated with the vibration amplitude and the resulting relationships are linearized to provide quantification criteria for bearing progressive failure prediction. The results from the above mentioned methodologies are compared for accuracy and redundancy, thus increasing the reliability for early detection of bearing damage and failure. It is shown that the use of the modified Poincare map can provide an effective way for identification and quantification of bearing damage in rolling element bearings.
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Schmied, Joachim, Marco Perucchi y Jean-Claude Pradetto. "Application of MADYN 2000 to Rotordynamic Problems of Industrial Machinery". En ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27302.

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The special requirements of rotordynamics engineering are illustrated by means of different examples of turbomachines. The differences between the properties of magnetic bearings and the more common fluid film bearings are pointed out in the examples of two turbocompressors. The importance of the bearing support properties are shown for a turbine generator train. The impact of seal forces are demonstrated for the turbocompressor supported on fluid film bearings. Two of the considered seals are honeycomb seals with frequency dependent characteristics. The consequences of the coupling of lateral and torsional vibrations in gears are illustrated for a gear compressor with three pinions. All examples have a practical background from troubleshooting and engineering work although they do not exactly correspond to real cases.
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Okabe, Eduardo Paiva, Jaime Izuka y Pierangelo Masarati. "Modeling and Simulation of a Wind Turbine Gear Set With Hydrodynamic Bearings Attached to an Induction Generator". En ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-59132.

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This work presents the numerical modeling and simulation of a wind turbine gearset with hydrodynamic bearings and an induction generator. Transmissions based on epicyclic gear trains applied to wind turbines have some advantages, i.e., compactness, robustness and low maintenance requirement. The early stages of the development of such mechanism need numerical results in order to design it properly. The complexity of this machine requires a multidisciplinary approach to model and simulate a system comprising of mechanical, fluid and electrical components. The bearing model is integrated to the kinetics of the gearbox, allowing a precise evaluation of the journal bearing’s movements. Through a multidisciplinary multibody dynamics software, the gearbox dynamics, the bearing behavior and the induction generator are calculated in a single system. The numerical solution of the hydrodynamic lubrication problem of a finite bearing is achieved using the finite element method. The hydrodynamic bearing and the induction generator are implemented as a user module in MBDyn software, which makes them available to model and simulate other types of rotating machinery. Simulations of two different conditions showed a better damping property when compared to rolling bearings, in this gearset.
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Informes sobre el tema "Bearings (Machinery)"

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Wiggins, John S. Active Control of Rotating Machinery Noise Through Use of Magnetic Bearings. Fort Belvoir, VA: Defense Technical Information Center, enero de 1998. http://dx.doi.org/10.21236/ada359086.

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Jenkins, Cody David. Bearing Fault Detection and Wear Estimation Using Machine Learning. Office of Scientific and Technical Information (OSTI), agosto de 2019. http://dx.doi.org/10.2172/1557163.

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Ozeki, Hiroshi. The Technology About Lubrication and Cooling of a Bearing for Machine Tool Spindle. Warrendale, PA: SAE International, mayo de 2005. http://dx.doi.org/10.4271/2005-08-0135.

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Cooley, Craig, H., Michael,, M. Khonsari y Brent Lingwall. The Development of Open Water-lubricated Polycrystalline Diamond (PCD) Thrust Bearings for Use in Marine Hydrokinetic (MHK) Energy Machines. Office of Scientific and Technical Information (OSTI), noviembre de 2012. http://dx.doi.org/10.2172/1056274.

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Lyu, Yi-Fan, Yan-Bo Wang y Guo-Qiang Li. INVESTIGATION ON LOCAL BEARING BEHAVIOR IN HIGH STRENGTH STEEL SINGLE-BOLT CONNECTION WITH MACHINE LEARNING TECHNIQUES. The Hong Kong Institute of Steel Construction, diciembre de 2018. http://dx.doi.org/10.18057/icass2018.p.072.

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Mascagni, Giulia, Roel Dom y Fabrizio Santoro. The VAT in Practice: Equity, Enforcement and Complexity. Institute of Development Studies (IDS), enero de 2021. http://dx.doi.org/10.19088/ictd.2021.002.

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The value added tax (VAT) is supposed to be a tax on consumption that achieves greater economic efficiency than alternative indirect taxes. It is also meant to facilitate enforcement through the ‘self-enforcing mechanism’ – based on opposed incentives for buyers and sellers, and because of the paper trail it creates. Being a rather sophisticated tax, however, the VAT is complex to administer and costly to comply with, especially in lower-income countries. This paper takes a closer look at how the VAT system functions in practice in Rwanda. Using a mixed-methods approach, which combines qualitative information from focus group discussions with the analysis of administrative and survey data, we document and explain a number of surprising inconsistencies in the filing behaviour of VAT-remitting firms, which lead to suboptimal usage of electronic billing machines, as well as failure to claim legitimate VAT credits. The consequence of these inconsistencies is twofold. It makes it difficult for the Rwanda Revenue Authority to exploit its VAT data to the fullest, and leads to firms, particularly smaller ones, bearing a higher VAT burden than larger ones. There are several explanations for these inconsistencies. They appear to lie in a combination of taxpayer confusion, fear of audit, and constraints in administrative capacity.
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