Готові списки джерел за темами / High-speed bearings

Добірка наукової літератури з теми "High-speed bearings"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "High-speed bearings"

1

TSUMAKI, Nabuo, and Tomoaki INOUE. "High Speed Bearings." Journal of the Society of Mechanical Engineers 94, no. 867 (1991): 121–25. http://dx.doi.org/10.1299/jsmemag.94.867_121.

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2

BRECHER, CHRISTIAN, STEPHAN NEUS, MARCUS GAERTNER, LEONARDO CATANA, FELICIANO GRECO, GULLERMO MORALES-ESPEJEL, and DEFENG LANG. "NEW BEARING STEEL FOR HIGH-SPEED APPLICATIONS." MM Science Journal 2021, no. 6 (December 15, 2021): 5334–39. http://dx.doi.org/10.17973/mmsj.2021_12_2021129.

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The requirements for speed suitability and fatigue strength of motor spindle bearings are constantly increasing. These challenges can be met by further developing the spindle bearings, e.g. by using higher-performance bearing steels. In the following, the experimental investigation results of a spindle bearing made of a new raceway steel tested on a high-speed rolling bearing test rig are presented. Spindle bearings of the type 7008 (hybrid execution) were tested in an endurance run at a rotational speed of 46 krpm and 3 kN axial load. The operating behaviour was validated based on the bearing outer ring temperature and the vibration behaviour. Microscope analysis of the raceways after the test shows that the new steel has good resistance to micropitting and surface fatigue. The calculated contact pressures, wear parameter and lifetime for the bearings in the tests show that the performance limits of spindle bearings are significantly higher than initially assumed.
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3

Żywica, Grzegorz, Paweł Bagiński, and Artur Andrearczyk. "Analysis of Thermal Damage in the High-Speed Foil Bearing." Solid State Phenomena 260 (July 2017): 266–77. http://dx.doi.org/10.4028/www.scientific.net/ssp.260.266.

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The article discusses experimental research and simulation testing on prototypical foil bearings. All experimental tests were conducted on a special test rig which makes it possible to operate in various conditions and within a wide range of speeds. As a result of the study, it turned out that adverse operating conditions caused almost instant bearing damage, accompanied by a significant rise in temperature. The main factors affecting the durability of foil bearings were material covering mating surfaces, bearing geometry, way of assembling the bearing, rotational speed and load. To better understand the physical phenomena occurring in foil bearings, a numerical model has been developed which allowed carrying out thermal analyses. The analysis of heat flow in the bearing's structure showed that, because of the system geometry, significant problems with proper removal of large amounts of heat continued to be experienced, which may have led to an accelerated rate of fatigue damage and shorter bearing life. This phenomenon can occur in bearings operating under tough conditions (e.g. at low speeds or under heavy loads). The research showed that the development of a new foil bearing is a very difficult task and requires many aspects to be taken into account, including the aspects directly related to the operation of the bearing itself, as well as those related to the rotor's operation and characteristics of the machine.
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4

Franchek, N. M., and D. W. Childs. "Experimental Test Results for Four High-Speed, High-Pressure, Orifice-Compensated Hybrid Bearings." Journal of Tribology 116, no. 1 (January 1, 1994): 147–53. http://dx.doi.org/10.1115/1.2927031.

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In this study, four hybrid bearings having different geometric configurations were experimentally tested for their static and dynamic characteristics, including flowrate, load capacity, rotordynamic coefficients, and whirl frequency ratio. The four bearings included a square-recess, smooth-land, radial-orifice bearing (baseline), a circular-recess bearing, a triangular-recess bearing, and an angled-orifice bearing. Each bearing had the same orifice diameter rather than the same pressure ratio. Unique to these test results is the measurement of the added mass terms, which became significant in the present tests because of high operating Reynolds numbers. Comparisons of the results were made between bearings to determine which bearing had the best performance. Based on the parameters of interest, the angled-orifice bearing has the most favorable overall performance.
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5

Pettinato, B. C., and P. DeChoudhury. "Rotordynamic and Bearing Upgrade of a High-Speed Turbocharger." Journal of Engineering for Gas Turbines and Power 125, no. 1 (December 27, 2002): 95–101. http://dx.doi.org/10.1115/1.1519273.

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The paper discusses the redesign of a high-speed turbocharger for improved bearing life and mechanical operation. The bearings were changed from a pair of combination journal/thrust bearings to a pair of redesigned journal bearings with double acting thrust bearing at the center of the unit. Internal oil passages, drain cavities, and seals were also revised. These modifications resulted in reduced oil leakage across end seals, reduced coke buildup at the turbine, increased thrust load capacity, and improved rotordynamics. Both the analytical and experimental results, which consisted of bearing performance and vibration data of original and modified systems are presented.
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6

Xiu, Shi Chao, Shi Qiang Gao, and Zhi Li Sun. "Study on Thermal Properties of Hybrid Journal Bearing for Super High Speed Grinding Machine." Advanced Materials Research 126-128 (August 2010): 808–13. http://dx.doi.org/10.4028/www.scientific.net/amr.126-128.808.

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As the high speed bearings, hybrid journal bearings are usually used in high and super high speed grinding machine spindle system. Since the bearing operates under high speed conditions, the excessive temperature rise of bearing is a key factor to lower the accuracy of the spindle system and limit the bearings working speed, so restrict the bearing applications. In this paper, the model of hybrid journal bearing is established to analyze the heat mechanism. In addition, the temperature field distribution for the certain hybrid journal bearing at high speed is studied by ANSYS considering the heat transfer characters between fluid and solid. The experiment of temperature for hybrid journal bearing system in super high speed grinding machine is also performed. The thermal properties and the measure for controlling temperature rise of such bearings are analyzed.
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7

KAKUTA, KAZUO. "Ultra high speed rolling bearings." Journal of the Japan Society for Precision Engineering 53, no. 7 (1987): 1005–8. http://dx.doi.org/10.2493/jjspe.53.1005.

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8

Li, He, Yu Wang, Deen Bai, Fuyan Lyu, Kuidong Gao, and Qingliang Zeng. "Suspending force modeling based on nonlinear acoustics and high-speed running experiments for an ultrasonic journal bearing." Advances in Mechanical Engineering 12, no. 7 (July 2020): 168781402094047. http://dx.doi.org/10.1177/1687814020940470.

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As a kind of promising noncontact bearings, ultrasonic bearings actuated by smart materials such as lead zirconate titanate ceramics show a good application prospect in high-speed machines and precision-measuring devices. The suspending force is one of the most important parameters that play a dominated role on the bearing’s static and dynamic performance. A suspending force model based on acoustic radiation theory for cylindrical object near sound source is built to predict the radial carrying capacity of an ultrasonic bearing actuated by three piezoelectric transducers. To validate the model, an ultrasonic bearing prototype is developed and a testing system is established. For observing the bearing’s dynamic running performance at high speeds, the bearing’s running experiment is carried out and the rotor center’s trajectory data and frequency spectrum are acquired to analyze the bearing’s dynamic characteristics at high speeds. The suspending force model and running performance experiments will contribute to the design, detection, and test of this type of bearings.
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Cui, Li. "A new fatigue damage accumulation rating life model of ball bearings under vibration load." Industrial Lubrication and Tribology 72, no. 10 (June 1, 2020): 1205–15. http://dx.doi.org/10.1108/ilt-05-2019-0180.

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Purpose Bearings in electric machines often work in high speed, light load and vibration load conditions. The purpose of this paper is to find a new fatigue damage accumulation rating life model of ball bearings, which is expected for calculating fatigue life of ball bearings more accurately under vibration load, especially in high speed and light load conditions. Design/methodology/approach A new fatigue damage accumulation rating life model of ball bearings considering time-varying vibration load is proposed. Vibration equations of rotor-bearing system are constructed and solved by Runge–Kutta method. The modified rating life and modified reference rating life model under vibration load is also proposed. Contrast of the three fatigue life models and the influence of dynamic balance level, rotating speed, preload of ball bearings on bearing’s fatigue life are analyzed. Findings To calculate fatigue rating life of ball bearings more accurately under vibration load, especially in high speed and light load conditions, the fatigue damage accumulation rating life model should be considered. The optimum preload has an obvious influence on fatigue rating life. Originality/value This paper used analytical method and model that is helpful for design of steel ball bearing in high speed, light load and vibration load conditions. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-05-2019-0180/
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10

Makino, T., S. Morohoshi, and S. Taniguchi. "Thermohydrodynamic Performance of High-Speed Journal Bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 210, no. 3 (September 1996): 179–87. http://dx.doi.org/10.1243/pime_proc_1996_210_497_02.

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This paper describes the performance characteristics of two types of journal bearings, tilting-pad and offset halves, operating under high-speed conditions where the journal peripheral speed is in excess of 100 m/s. Experimental investigations into bearing eccentricity, temperatures and dynamic coefficients were carried out with a specially designed test rig. These results are compared with theoretical data which are obtained from thermohydrodynamic lubrication theory. The agreement is satisfactory. However, further improvements are necessary to predict more accurate thermal performance of the unloaded pads.
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Дисертації з теми "High-speed bearings"

1

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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2

Karthikeyan, Bindu Kumar. "Tribo-dynamics of high speed precision spindle bearings." Thesis, Loughborough University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547399.

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3

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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4

Wasson, Kevin L. (Kevin Lee). "Hydrostatic radial bearings for high speed precision machine tool applications." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/12287.

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5

Wong, Chee Wei 1975. "Design, fabrication, experimentation and analysis of high-speed microscale gas bearings." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/8876.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2001.
Includes bibliographical references (p. [183]-190).
Microengine Program. The all-silicon device consist of a free-rotating microturbine, with 4.2 mm rotor diameter, enclosed within a five wafer fusion-bonded stack. Of note are the low aspect ratio journal bearing and large journal bearing clearances, primarily limited by microfabrication, from which stable bearing operation must first be demonstrated as viable. Theoretical modeling of the gas-lubricated hydrostatic journal bearing presents design charts, a comparative study of existing predictions and investigation into rotational effects to consider the bearing stiffness during operation. Continued experimental refinements and exploration with our microfabricated rotor achieved rotational speeds up to 1.4 million rpm and peripheral speeds in excess of 300 m/s. Extensive experimental data is presented with analysis, focusing on whirl motion and its harmonic resonances as candidates for instability. Causes of ultimate failure is suggested with recommendations for further improvements. Moreover, in an effort to accomplish self-sustained microbearings, the axial thrust bearing is redesigned for a self-acting spiral groove bearing. The chosen constraint is to incorporate the hydrodynamic thrust bearing with minimal changes to the current device, whilst providing the required load and stiffness. Stability analysis and rarefaction considerations on the optimized design suggests an operating range for the bearing, leading to a hybrid design for ample stiffness during initial operation. The design is then developed into a microfabrication process flow and implemented successfully into the MicroBearing test devices. Experiments on a hybrid bearing were performed to gage the spiral grooves characteristics. A purely hydrodynamic aft thrust bearing device is then tested for operation through low speeds, although the effects of the spiral grooves could not be accurately determined. Finally, transition to a hydrodynamic operating mode for a hybrid bearing is demonstrated.
by Chee Wei Wong.
S.M.
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6

Orr, Doyle Jay 1969. "Macro-scale investigation of high speed gas bearings for MEMS devices." Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/9268.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2000.
Includes bibliographical references (p. 309-315).
A macro-scale experimental test facility for investigating high-speed gas bearings for MEMS devices such as the MIT Micro-Engine is presented along with results from subsequent experiments. It is shown that the bearings required by such MEMS devices fall outside the usual range of design parameters for conventional gas lubrication systems. Due to the unorthodox design of the bearings, a new "hybrid" mode of operation is introduced along with the traditional hydrodynamic regime. The new hybrid mode is exploited to implement a novel in-situ rotor balancing scheme which enables hydrodynamic operation. Analysis for both modes of operation is presented along with experimental results. A high-order, efficient scheme for computing both the steady and unsteady hydrodynamic properties of the fully coupled, rotor/gas film dynamical system is presented along with comprehensive calculations for this class of plain, cylindrical, gas journal bearing. The scheme is then used to perform a generalized eigenvalue analysis on the compressible, unsteady system which reveals a new type a hydrodynamic instability. From a fundamental understanding of the bearing physics, strategies for operating MEMS devices with this class of bearing are deduced and minimum requirements for the accompanying measurement systems are established. Ancillary issues such as axial equilibrium of the rotor are discussed in detail.
by Doyle Jay Orr, Jr.
Ph.D.
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7

Martin, M. J. "Elastohydrodynamic films and scuffing behaviour in high speed angular contact ball bearings." Thesis, Cardiff University, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543267.

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8

Gao, Wenjun. "Modelling of windage and churning losses in high speed rolling element bearings." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI048/document.

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Dans un système de machines rotatives comme un moteur à turbine, les paliers d'éléments roulants à grande vitesse jouent un rôle important dans le support de l'arbre ou du rotor rotatif, et ont besoin d'une lubrification pour assurer leur fonction. Sauf qu'une petite quantité d'huile est nécessaire pour former le film lubrifiant élastohydrodynamique dans la zone de contact, la plus grande partie du lubrifiant reste en suspension dans l'air, formant un mélange huile/air. Ce phénomène entraîne des pertes hydrauliques parasitaires excessives lorsque les éléments roulants se translatent et tournent dans l'environnement fluide, ce qui peut constituer une partie relativement importante de la perte de puissance totale du roulement, appelée traînée d'enroulement et pertes de barattage. Pour une vitesse de rotation jusqu'à 3× 106 Ndm, la contribution de la traînée/dérive au total peut atteindre 50%. Cependant, jusqu'à présent, il existe peu d'approches utilisées directement pour l'estimation des pertes par traînage, qui ne pouvait fournir qu'une approximation plutôt grossière. Dans cette thèse, la méthode CFD est utilisée pour analyser d'abord l'écoulement autour d'un cylindre circulaire de longueur finie avec deux extrémités libres dans un espace ouvert. Ensuite, le modèle est remplacé par plusieurs cylindres circulaires en ligne pris en sandwich par deux parois plates, ce qui représente une approche simplifiée. Le fluide est ici considéré comme incompressible, représentant un fluide monophasé équivalent pour l'écoulement diphasique huile/air à l'intérieur de la cavité de palier avec des propriétés de fluide spécifiées. Les résultats indiquent que l'écoulement autour de l'élément de rouleau de longueur finie est perturbé par ses deux extrémités libres, les anneaux environnants, la cage et d'autres éléments roulants. Il est proposé une relation entre le coefficient de traînée et le nombre de Reynolds approprié pour un cylindre circulaire dans les roulements à rouleaux (1
In a rotating machinery system like turbine engine, high speed rolling element bearings play an important role in supporting the rotating shaft or rotor, and need lubrication to insure their function. Except a small quantity of oil is needed to form the elastohydrodynamic lubricant film in the contact zone, most of lubricant remains in suspension in air, forming an oil/air mixture. This phenomenon leads to excessive parasitic hydraulic losses when rolling elements translate and rotate into the fluid environment, which may constitute a relatively large portion of the bearing's total power loss, named windage drag and churning losses. For high speed applications, i.e. for rotational speed up to 3× 10^6 Ndm, the contribution of drag/windage loss to the total one may reach up to 50%. However, so far there are few approaches used directly for drag and churning losses estimation, which could only provide a rather gross approximation. In this thesis, the Computational Fluid Dynamics (CFD) method is employed to analyze first the flow around one finite-length circular cylinder with two free ends in an open space. Then the model is changed to several in-line circular cylinders sandwiched by two flat walls, which represents a simplified approach. The fluid here is regarded as incompressible, representing an equivalent one-phase fluid for the oil/air two-phase flow inside the bearing cavity with specified fluid properties. The results indicate that the flow around the finite length roller element is perturbed by its two free ends, the surrounding rings, the cage and other rolling elements. A relationship between the drag coefficient and the Reynolds number suitable for circular cylinder in roller bearings (1
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9

Kim, Tae Hyun. "Fatigue of surface engineered steel in rolling-sliding contact." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325019.

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10

Rodriguez, Colmenares Luis Emigdio. "Experimental frequency-dependent rotordynamic coefficients for a load-on-pad, high-speed, flexible-pivot tilting-pad bearing." Texas A&M University, 2003. http://hdl.handle.net/1969.1/138.

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This thesis provides experimental frequency dependent stiffness and damping coefficient results for a high-speed, lightly loaded, flexible-pivot tilting-pad bearing, with a load-on-pad configuration. Test conditions include four shaft speeds (6000, 9000, 13000 and 16000 rpm), and bearing unit loads from 172 kPa to 690 kPa. The results show that the bearing stiffness is a quadratic function of the frequency of vibration; hence their frequency dependency can be modeled by added-mass terms. The additional degrees of freedom introduced by the pads and the influence of the inertial forces generated in the fluid film account for this frequency dependency. The conventional frequency-dependent stiffness and damping model for tilting-pad bearings is extended with an added-mass matrix to account for the frequency dependency. This approach allows the description of the bearing dynamic characteristics with frequency-independent stiffness, damping and added-mass matrices. Experimental results are compared with predictions from the Reynolds equation and from a bulk-flow Navier-Stokes model. Both models produce good predictions of the stiffness and damping coefficients. However, results show that the bulk-flow model is more adequate for predicting the direct added-mass terms because it accounts for the fluid inertial forces. A bulk-flow solution of the Navier-Stokes equations that includes the effects of fluid inertia should be used to calculate the rotordynamic coefficients of a flexible-pivot tilting-bearing. Static performance measurement results are also detailed. Results include pad metal temperatures, eccentricity-ratios and attitude-angle as a function of bearing load, and estimated power losses.
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Книги з теми "High-speed bearings"

1

Arnold, Walter. Beitrag zu Entwicklung und Einsatz aktiv magnetgelagerter Hochgeschwindigkeits-Frässpindeln. München: Hanser, 1985.

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2

Pinel, Stanley I. Comparison between oil-mist and oil-jet lubrication of high-speed, small-bore, angular-contact ball bearings. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.

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3

Ashman, David. High-speed performance of a hydrostatic thrust bearing. Wolverhampton: The Polytechnic, Wolverhampton, 1987.

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4

United States. National Transportation Safety Board. Railroad accident report: Head-on collision of Burlington Northern Railroad Company freight trains Extra 6311 West and Extra 6575 East near Westminster, Colorado, August 2, 1985. Washington, D.C: The Board, 1986.

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5

United States. National Transportation Safety Board. Railroad accident report: Rear end collision between Conrail trains OIPI-6 and ENPI-6X near Saltsburg, Pennsylvania, February 26, 1984. Washington, D.C: National Transportation Safety Board, 1985.

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6

Board, United States National Transportation Safety. Railroad accident report: Rear end collision and derailment of two Union Pacific freight trains near North Platte, Nebraska on July 10, 1986. Washington, D.C: The Board, 1987.

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7

United States. National Transportation Safety Board. Railroad accident report: Rear end collision of two Chicago Transit Authority trains near the Montrose Avenue Station, Chicago, Illinois, August 17, 1984. Washington, D.C: The Board, 1985.

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8

United States. National Transportation Safety Board. Railroad accident report: Derailment of Seaboard System Railroad train no. F-690 with hazardous material release, Jackson, South Carolina, February 23, 1985 and collision of Seaboard System Railroad train no. F-481 with standing cars, Robbins, South Carolina, February 25, 1985. Washington, D.C: The Board, 1985.

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9

United States. National Transportation Safety Board. Railroad accident report: Seaboard System Railroad freight train FERHL derailment and fire, Marshville, North Carolina, April 10, 1984. Washington, D.C: The Board, 1985.

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10

United States. National Transportation Safety Board. Railroad accident report: Rear-end collision of two Greater Cleveland Regional Transit Authority Red Line rapid transit trains near the 98th Street Station, Cleveland, Ohio, July 10, 1985. Washington, D.C: The Board, 1987.

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Частини книг з теми "High-speed bearings"

1

Maslen, E. H., P. E. Allaire, M. A. Scott, and P. Hermann. "Magnetic Bearing Design for a High Speed Rotor." In Magnetic Bearings, 137–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-51724-2_14.

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2

Borisavljevic, Aleksandar. "Bearings for High-Speed Machines." In Limits, Modeling and Design of High-Speed Permanent Magnet Machines, 117–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33457-3_6.

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3

Adams, Maurice L. "Water-Lubricated High-Speed Bearings." In 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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4

Spakovszky, Zoltán S. "High-Speed Gas Bearings for Micro-Turbomachinery." In Multi-Wafer Rotating MEMS Machines, 191–278. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-0-387-77747-4_6.

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5

Holmes, R. "On Bearing Deformation and Temperature Distribution in Dynamically-Loaded Engine Bearings." In 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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6

Vermeulen, M. "Dynamic Behaviour of Hydrostatic Radial Bearings." In 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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7

Diana, G., F. Cheli, A. Manenti, and F. Petrone. "Non Linear Effects in Lubricated Bearings." In 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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8

Allison, Bryan D., Jean-Baptiste Coudert, Gaël Guétard, Alexandre Mondelin, Renaud Vermoere, Johanna André, Jacques Bellus, and Yves Maheo. "New Class of High-Speed Steels for Aero Rolling Bearings." In Bearing Steel Technologies: 11th Volume, Advances in Steel Technologies for Rolling Bearings, 260–74. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2017. http://dx.doi.org/10.1520/stp160020160131.

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9

Lund, J. W. "Dynamic Coefficients for Fluid Film Journal Bearings." In 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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10

Kaya, Faris. "Stability of Flexible Rotor Supported on Journal Bearings." In Vibration and Wear in High Speed Rotating Machinery, 559–65. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-1914-3_32.

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Тези доповідей конференцій з теми "High-speed bearings"

1

Donaldson, J. "High speed fans." In IEE Colloquium on High Speed Bearings for Electrical Machines. IEE, 1997. http://dx.doi.org/10.1049/ic:19970889.

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2

Hofmann, D. A. "Gearing for high speed motors." In IEE Colloquium on High Speed Bearings for Electrical Machines. IEE, 1997. http://dx.doi.org/10.1049/ic:19970890.

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3

Crane, R. "Magnetic bearings for high speed turbo molecular pumps." In IEE Colloquium on High Speed Bearings for Electrical Machines. IEE, 1997. http://dx.doi.org/10.1049/ic:19970891.

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4

Jayawant, R. "Electrical machines fitted with Glacier magnetic bearings." In IEE Colloquium on High Speed Bearings for Electrical Machines. IEE, 1997. http://dx.doi.org/10.1049/ic:19970888.

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5

Strzelecki, S., and J. Piechna. "Calculation of High Speed Multilobe Journal Bearings." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63829.

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Анотація:
The bearing systems of turbocompressors, compressors and turbine gear trains consist the multilobe journal bearings. In these bearings, high speed of journal causes, that the oil film of bearing is not laminar but turbulent one. Turbulent oil film affects the bearing operating characteristics. Calculations in this case can not be carried-out on the condition of laminar oil film but on the assumption of turbulent one. The paper introduces theoretical calculations of the high speed multilobe journal bearing affected by turbulent oil film. For the 4-lobe journal bearing the different values of lobe clearance ratio and relative length of the bearing were assumed. The Reynolds, energy and viscosity equations were solved numerically on the assumption of incompressible lubricant and the turbulent adiabatic flow of oil in the bearing gap.
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6

Reddy, D. Sudheer Kumar, S. Swarnamani, and B. S. Prabhu. "Tribology of High Speed Aerodynamic Foil Journal Bearings." In ASME 1997 Turbo Asia Conference. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-aa-082.

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Foil journal bearings come under the category of air lubricated journal bearings where the lubricant is atmospheric air. In this type of bearings the pressure developed is due to the aerodynamic wedge developed between the rotating shaft and the foil bearing surface. This paper is concerned with the analysis of the bending dominated type foil bearing, in which the compliance is effected mainly through the bending of foils. The nonlinear Reynolds equation has been used for the aerodynamic pressure solution. Effect of elastohydrodynamics on foil journal bearing has been studied. The problem has been formulated using incremental finite element method. Two types of bending dominated foil bearings have been considered for analysis, namely straight foil type and curved foil type bearings. The equations for the dynamic coefficients were obtained by a perturbation technique and the results were computed using the finite element method. The effect of bearing compliance and the bearing number on performance parameters has been studied, the results were compared with the available literature.
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7

Dowers, A. T. "The pursuit of higher rotational speeds; developments in bearing design and materials." In IEE Colloquium on High Speed Bearings for Electrical Machines. IEE, 1997. http://dx.doi.org/10.1049/ic:19970892.

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8

Reuter, K. "Integrated machinery systems for cryogenic processes consisting of turboexpander, compressor, high-frequency motor and generator with magnetic bearings." In IEE Colloquium on High Speed Bearings for Electrical Machines. IEE, 1997. http://dx.doi.org/10.1049/ic:19970893.

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9

Grum, N. "Active magnetic bearing requirements for turbomachinery." In IEE Colloquium on High Speed Bearings for Electrical Machines. IEE, 1997. http://dx.doi.org/10.1049/ic:19970894.

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10

Kilian, Matthias R. "Rolling Bearings in High Speed Passenger Traffic." In 2010 Joint Rail Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/jrc2010-36016.

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Анотація:
Passenger transport today runs significantly faster than some decades ago and often operates on separate tracks especially constructed for high speed trains. As rolling bearings are very important components in the bogies of trains they have to be suitably designed for high speed. The maximum train speeds reach up to 380 km/h (236 mph) for the latest high speed applications which are 80% higher than in the earlier days of high speed traffic. The paper presents a couple of application examples of modern high speed traffic together with some typical bearing arrangements and housings. It gives some insight into measures taken in the bearing industry to meet the requirements of contemporary high speed traffic and it mentions important standards and regulations applicable for, but not restricted to European applications. The main focus is on journal bearings. Information on traction motor bearings, transmission bearings and housings is included but described in less detail.
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Звіти організацій з теми "High-speed bearings"

1

Vaes, David, Yi Guo, Pietro Tesini, and Jonathan A. Keller. Investigation of Roller Sliding in Wind Turbine Gearbox High-Speed-Shaft Bearings. Office of Scientific and Technical Information (OSTI), May 2019. http://dx.doi.org/10.2172/1524765.

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2

Forster, Nelson H., Jeffrey R. Brown, and David T. Gerardi. Carbon-Phenolic Cages for High-Speed Bearings. Part II - Bearing Evaluation with a Multiply-Alkylated Cyclopentane (MAC) Lubricant. Fort Belvoir, VA: Defense Technical Information Center, January 2003. http://dx.doi.org/10.21236/ada416136.

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3

Forster, Nelson H. Carbon-Phenolic Cages for High-Speed Bearings. Part 1 - Friction and Wear Response of Phenolic Composite Impregnated with a Multiply-Alkylated Cyclopentane (MAC) Lubricant and MoS2 Solid Lubricant. Fort Belvoir, VA: Defense Technical Information Center, January 2003. http://dx.doi.org/10.21236/ada416130.

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4

Keller, J., Y. Guo, and B. McNiff. Gearbox Reliability Collaborative High Speed Shaft Tapered Roller Bearing Calibration. Office of Scientific and Technical Information (OSTI), October 2013. http://dx.doi.org/10.2172/1107454.

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5

Keller, Jonathan, and Yi Guo. Gearbox Reliability Collaborative Investigation of High-Speed-Shaft Bearing Loads. Office of Scientific and Technical Information (OSTI), June 2016. http://dx.doi.org/10.2172/1260343.

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6

Keller, Jonathan A., Yi Guo, and Latha Sethuraman. Uptower Investigation of Main and High-Speed-Shaft Bearing Reliability. Office of Scientific and Technical Information (OSTI), May 2019. http://dx.doi.org/10.2172/1513196.

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7

Sun, D. C., and D. E. Brewe. A High-Speed Photography Study of Cavitation in a Dynamically Loaded Journal Bearing. Fort Belvoir, VA: Defense Technical Information Center, October 1990. http://dx.doi.org/10.21236/ada225679.

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