Relevant bibliographies by topics / Radial bearing

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Radial bearing'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Radial bearing"

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Koike, Hitonobu, Koshiro Mizobe, Shunsuke Oyama, Yuji Kashima, Kenji Kanemasu, and Katsuyuki Kida. "Observation of Wear on PEEK-PTFE Hybrid Radial Bearings." Advanced Materials Research 683 (April 2013): 385–90. http://dx.doi.org/10.4028/www.scientific.net/amr.683.385.

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In this paper, the wear performance of hybrid radial bearing (PEEK-PTFE and alumina ball) was investigated. For effective operation of equipment in clean energy facilities environment, the PEEK-PTFE hybrid bearings was developed. Radial PEEK-PTFE hybrid bearings were produced by machining and their rolling contact fatigue (RCF) behavior under non-lubricated condition was carried out. PEEK accumulation layer with PTFE and graphite appeared on the bearing's inner ring under 600-3000 rpm rotation speed. Due to the self-lubrication of PEEK layer, the wear loss of hybrid bearing cycles was lower than in the case of neat PEEK radial bearing. Moreover, It was found that the thin PEEK layer protected the raceway from the friction heat and wear.
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Koike, Hitonobu, Toshihiko Matsumura, Koshiro Mizobe, Yuji Kashima, and Katsuyuki Kida. "Evaluation of Tribological Thermal Failure on PEEK-PTFE Hybrid Alumina Ball Bearings." Materials Science Forum 878 (November 2016): 142–47. http://dx.doi.org/10.4028/www.scientific.net/msf.878.142.

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In this paper, the thermal failure (seizure or melting) of hybrid radial bearing (PEEK ring-PTFE composite retainer and alumina ball) under rolling contact fatigue test was investigated. For effective operation of equipment in various environments such as dirty, harmful or corrosion situations, the radial PEEK-PTFE hybrid bearings were produced by machining. The PEEK accumulation layer containing carbon graphite was formed on the raceway of bearing's inner ring at 1200-1500 rpm rotation speed. Due to the self-lubrication of the PEEK composite accumulation layer as solid lubricant, the operation temperature in the hybrid bearing was lower than that of all PEEK radial bearing, and the load capacity of the PEEK bearings could be improved. Moreover, it was found that the PEEK composite film which is formed from the PEEK composite layer protected the raceway from the friction heat.
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Koike, Hitonobu, Koshiro Mizobe, Shunsuke Oyama, Yuji Kashima, Kenji Kanemasu, and Katsuyuki Kida. "Comparison of Wear on PEEK-PTFE and PPS-PTFE Radial Bearings under Rolling Contact Fatigue." Applied Mechanics and Materials 372 (August 2013): 503–6. http://dx.doi.org/10.4028/www.scientific.net/amm.372.503.

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In this paper, the wear performance of polymer radial ball bearings (PEEK-PTFE and PPS-PTFE) were investigated. For effective operation of equipment in clean energy facilities environment, the polymer bearings were developed. These polymer bearings were produced by machining and their rolling contact fatigue (RCF) behavior under non-lubricated condition was carried out. PEEK accumulation layer with PTFE and graphite was formed on the bearing's inner ring under 3000 rpm high rotation speed. Due to the self-lubrication of PEEK layer, the wear loss of PEEK-PTFE bearing was lower than PPS-PTFE radial bearing. Moreover, it was found that the thin PEEK layer protected the raceway from the friction heat and wear. The wear durability of PEEK-PTFE bearing was superior to PPS-PTFE one.
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Dumont, C., V. Kluyskens, and B. Dehez. "Yokeless radial electrodynamic bearing." Mathematics and Computers in Simulation 130 (December 2016): 57–69. http://dx.doi.org/10.1016/j.matcom.2015.10.003.

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Zhou, Jian Hui, Ru Gang Chen, and De Zhi Li. "Design and Lubricating Property Research on Radial Supporting Bearing of Marine Main Thrust Bearing." Advanced Materials Research 314-316 (August 2011): 1396–400. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.1396.

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The radial supporting bearing of main thrust bearing is the key equipments of shafting on large-scale ships, whose working lubricating property has an important influence on the working condition of the shaft. By means of theoretical analysis and Matlab programming, investigations have done on the main working condition lubricating of the radial supporting bearings. And the distribution rules of oil film thickness and pressure under same vertical load and different rotate speed is given, which lays a foundation for the design of large marine’s thrust bearing.
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Wei, Yan Gang, Yan Kui Liu, and Xiu Juan Zhang. "The Effects of Hollow Ratio on the Radial Bearing Properties of Pre-Loaded Cylindrical Roller Bearings." Advanced Materials Research 299-300 (July 2011): 1078–82. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.1078.

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The finite element method is adopted to analyze the pre-loaded cylindrical roller bearings according to the theory of contact mechanics. The effects of hollow ratio on the radial stiffness of bearings, the maximum contact stress of rollers, and the maximum radial load of bearing are analyzed. The analysis results show that the smaller the hollowness is, the larger the radial stiffness of pre-loaded cylindrical roller bearings, the maximum contact stress of the rollers, and the maximum radial load of the bearing would be. Under different magnitude loads, the reasonable combination of interference magnitude with the hollowness can not only increase the stiffness of roller bearings, but also decrease the maximum stress of rollers, which provides a reference for the design and manufacture of pre-loaded cylindrical roller bearings.
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Silchenko, P. N., G. A. Timofeev, M. V. Mesnyankin, and E. S. Novikov. "Load Capacity of Eccentric Roller Bearings." Proceedings of Higher Educational Institutions. Маchine Building, no. 07 (724) (July 2020): 13–21. http://dx.doi.org/10.18698/0536-1044-2020-7-13-21.

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Eccentric roller bearings are commonly used in engineering and serve as actuating links in mechanical drives of various machines. Load capacity is one of the main parameters of such bearings. This paper presents possible kinematic schemes of an eccentric roller bearing and the specifics of the actual radial load distribution when it is applied to the driving ring between the rolling bodies. It is established that the load capacity of the eccentric roller bearing depends on the actual stress occurring when the rolling body of the minimal radius and the inner ring raceway are in contact. Equations are obtained for calculating the permissible radial load that the rolling body of the minimal radius with a raceway can bear. The limiting load is determined that satisfies the conditions of contact strength of the bearing’s assembly units and ensures performance of the bearing in a mechanical drive of a machine. The results of determining the limiting load of the eccentric roller bearing and the results’ analysis are presented using a specific example. To ensure the performance of the bearing, the optimal ratio of the inner ring radius to the minimum rolling body radius is determined.
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Baun, D. O., and R. D. Flack. "A Plexiglas Research Pump With Calibrated Magnetic Bearings/Load Cells for Radial and Axial Hydraulic Force Measurement." Journal of Fluids Engineering 121, no. 1 (March 1, 1999): 126–32. http://dx.doi.org/10.1115/1.2821992.

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A research pump intended for both flow visualization studies and direct measurement of hydrodynamic radial and axial forces has been developed. The impeller and the volute casing are constructed from Plexiglas which facilitates optical access for laser velocimetry measurements of the flow field both inside the impeller and in the volute casing. The pump housing is designed for flexibility allowing for each interchange of impellers and volute configurations. The pump rotor is supported by three radial magnetic bearings and one double acting magnetic thrust bearing. The magnetic bearings have been calibrated to characterize the force versus coil current and air gap relationship for each bearing type. Linear calibration functions valid for rotor eccentricities of up to 2/3 of the nominal bearing clearances and force level of ±58 N (13 lbf) and ±267 N (60 lbf) for the radial and axial bearings, respectively, were found. A detailed uncertainty analysis of the force calibration functions was conducted such that meaningful uncertainty bounds can be applied to in situ force measurements. Hysteresis and eddy current effects were quantified for each bearing such that their effect on the in situ force measurements could be assessed. By directly measuring the bearing reaction forces it is possible to determine the radial and axial hydraulic loads acting on the pump impeller. To demonstrate the capability of the magnetic bearings as active load cells representative hydraulic force measurements for a centered 4 vane 16 degree log spiral radial flow impeller operating in a single tongue spiral volute casing were made. At shut-off a nondimensional radial thrust of 0.084 was measured. A minimum nondimensional radial thrust of about 0.007 was observed at the nominal design flow. The nondimensional radial thrust increased to about 0.019 at 120 percent of design flow. The nondimensional axial thrust had a maximum at shut-off of 0.265 and decreased steadily to approximately 0.185 at 120 percent of design flow. Two regions of increasing axial thrust, in the flow range 75 to 100 percent of design flow, were observed. The measurements are compared to radial and axial force predictions using classical force models. The direct radial force measurements are compared to a representative set of radial force measurements from the literature. In addition, the directly measured radial force at design flow is compared to a single representative radial force measurement (obtained from the literature) calculated from the combination of static pressure and net momentum flux distribution at the impeller exit.
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Wang, Xiao Zeng, and Jiu Hong Yang. "Influence of Rolling Bearing Steel Ball Temperature Deformation on Radial Clearance." Applied Mechanics and Materials 275-277 (January 2013): 51–55. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.51.

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According to theory of thermoelasticity, the paper deduces the formulas of the rolling bearing steel ball transient temperature, radial stress, tangential stress, radial displacement, and radial clearance, analyzes the influence of the temperature deformation on the radial clearance. The result shows that the radial displacement changes slowly on the surface, reaches the maximum when temperature becomes stable. The reduction value of the radial clearance is the linear function of the temperature and position. Fitness formula is adopted to calculate the radial clearance in the different temperature and radius. The error is less than 0.2% and 0.18%. The radial clearance formula is used to calculate the bearing’s maximum working temperature when the radial clearance reaches the standard radial clearance to ensure the reliable work of the bearing.
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Murphy, B. T., and M. N. Wagner. "Measurement of Rotordynamic Coefficients for a Hydrostatic Radial Bearing." Journal of Tribology 113, no. 3 (July 1, 1991): 518–25. http://dx.doi.org/10.1115/1.2920654.

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Measurement of rotordynamic coefficients is presented for a pair of hydrostatic radial bearings, including direct and cross-coupled stiffness and damping. Two different hydrostatic configurations were tested: (1) an externally fed bearing 74.7 mm (2.95 in.) in diameter with a nominal direct stiffness of approximately 210 MN/m (1.2 million lb/in.) and (2) an internally fed bearing 54.6 mm (2.15 in.) in diameter with a nominal direct stiffness of approximately 88 MN/m (0.5 million lb/in.). Each bearing had 6 equally spaced hydrostatic pressure pockets, stationary for the externally fed bearing and rotating for the internally fed bearing. Also, both bearings had extended exit regions to provide additional damping. The top rotational speed was 22,700 rpm and the maximum axial Reynolds number was 50,000 using a freon derivative, Freon-113, as the working fluid. The test apparatus was a “synchronous rig” as an intentionally eccentric journal was used as the sole source of excitation. Data reduction was done by performing a matrix solution to separate damping from stiffness. Results show the internally fed bearing to be 20 percent less stiff than predicted, and to have a significant amount of damping which agrees well with predictions. The internally fed bearing was found to be approximately 60 percent less stiff than predicted, and to be roughly neutral in terms of damping, as predicted.
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Dissertations / Theses on the topic "Radial bearing"

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Viitala, R. (Risto). "Dynamic radial bearing force measurement of flexible rotor." Master's thesis, University of Oulu, 2018. http://urn.fi/URN:NBN:fi:oulu-201809062733.

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Dynamic characteristics of a paper machine roll have been widely investigated for decades. Vibration of the rolls decrease the paper quality and excites the structures of the paper machine. Therefore, vibration must be avoided and kept at its minimum. Vibration of a rotor develops periodic radial bearing forces, which are connected to the amplitude and the frequency of the vibration. Vibration based forces are unnecessary dynamic forces, which increase the bearing load in addition to unavoidable rotor mass and the external loads of the process. This experimental study presents the amplitudes of the dynamic bearing force caused by a vibrating rotor and enables further measurements and research about the correlation between the radial bearing force and e.g. acceleration data. During the research knowledge about the dynamic behavior of the rotor and developed forces can be increased. The improved knowledge leads to a lower bearing force level, which decreases the oversizing of the structures, enables the design of lighter and more cost-effective structures, extends the lifespan of the machine and improves the quality of the end product. The dynamic radial bearing force amplitudes of a paper machine roll are merely available through simulation models, since physical force sensors are not mounted on the paper machines. Typically, the monitoring of a paper machine is focused on the vibrations of the paper machine rolls, since it is more relevant for to the quality of the paper than the amplitudes of force. Vibration troubleshooting and monitoring tasks have typically been realized through the easy-installed accelerometer measurements. The force measurement of the paper machine roll can produce similar information about the behavior of the rotor and its vibrations as acceleration measurement in addition to the radial force amplitudes. However, utilization of force measurements in vibration monitoring was not found based on a literature survey. The radial bearing force measurement was accomplished by building a test rig and a measurement device for an industrial-size paper machine roll. The radial bearing forces were measured as close as possible to the action point of the load to produce reliable results. The results present the force measurement data, which were acquired with the calibrated and verified measurement device implemented during this study. The measured results revealed the forces affecting on both ends of the test roll. The data was analyzed with Fast Fourier Transform (FFT) to present the forces in the frequency domain and to investigate their harmonic components. The measured forces, which were divided into harmonic components, could be discovered and destabilizing excitations could be defined more efficiently. Based on the present study high harmonic components could be distinguished with the force measurement. The results were compared with two reference measurements, which utilize acceleration and position sensors. The results cannot be generalized, since the measuring results consider only the roll of this research. The roll, the bearings, the bearing support and the foundation form the rotating system, which is always individual. Parameters and excitations affecting to the behavior of the roll are different in every roll. However, the similar behavior can be assumed to be on other flexible rotors as well and those can be measured with similar methods as the present study. In further research additional knowledge about the behavior of the roll and correlations between force, position and acceleration can be achieved for both the scientific and practical engineering purposes with the dynamic bearing force measurement and a simultaneous acceleration or position measurement
Paperikoneen telan värähtelyominaisuuksia on tutkittu laajasti jo vuosikymmeniä. Värähtely heikentää paperin laatua ja aiheuttaa herätettä paperikoneen rakenteisiin. Tästä johtuen värähtely yritetään pitää minimaalisena. Roottorin värähtely aiheuttaa jaksollisia laakerivoimia, jotka ovat yhteydessä värähtelyyn. Värähtelyn aiheuttamat voimat ovat ei-toivottuja dynaamisia voimia, jotka lisäävät laakerivoimia välttämättömän roottorimassan ja muiden prosessista aiheutuvien rasitusten lisäksi. Tämä kokeellinen tutkimus keskittyy värähtelevän roottorin aiheuttamiin dynaamisiin voimiin ja mahdollistaa myöhemmän mittaamisen ja korrelaatioiden tutkimisen laakerivoimien ja esimerkiksi kiihtyvyysmittauksen välillä. Tietoa roottorin dynaamisesta käyttäytymisestä ja syntyvistä voimista voidaan parantaa tällä tutkimuksella. Paperikoneen telan dynaamisten ominaisuuksien parempi tunteminen vähentää rakenteiden ylimitoitusta, mikä mahdollistaa rakenteiden suunnittelun kevyemmäksi ja halvemmaksi, lisää koneen käyttöikää ja parantaa lopputuotteen laatua. Telan värähtelyn aiheuttamia dynaamisia laakerinvoimia on saatavilla vain simuloimalla, mikä tarkoittaa, että fyysisiä voima-antureita ei ole asennettuina paperikoneissa. Yleensä paperikoneen anturointi keskittyy paperikoneen telojen värähtelyyn, sillä se on isompi tekijä paperin laaduntarkkailussa kuin voimamittaus. Värähtelymittaukseen perustuvaa vianetsintää ja prosessivalvontaa on tehty tyypillisesti helposti kiinnitettävillä kiihtyvyysantureilla. Voimamittaus pystyy tuottamaan saman informaation roottorin käyttäytymisestä ja sen värähtelystä kuin kiihtyvyysmittaus laakerivoimien lisäksi. Kuitenkaan, voimamittausta ei käytetä värähtelymittauksiin kirjallisuusselvityksen mukaan. Laakerivoimamittaus suoritetaan rakentamalla koepenkki sekä mittalaite teollisuudessa käytettävälle paperikoneen telalle. Laakerivoimat pyritään mittaamaan mahdollisimman läheltä voimanvaikutuspistettä, että saavutettaisiin mahdollisimman luotettava tulos. Mittatulokset saatiin kalibroidulla ja verifioidulla mittalaitteella, joka oli rakennettu tämän työn aikana. Mittaustulokset paljastivat telan laakereihin syntyvät voimat kummassakin päässä telaa. Tulokset analysoitiin käyttäen nopeaa Fourierin muunnosta (FFT), jotta voimat saatiin taajuustasoon harmonisten komponenttien tutkimiseksi. Mitatut voimat ja niiden amplitudit, jotka olivat esitettyinä harmonisina komponentteina, voitiin löytää ja telan värähtelyä aiheuttavat herätteet voitiin rajata tehokkaammin. Tämän tutkimuksen perusteella voitiin huomata, että korkeat harmoniset taajuudet voitiin havaita voimamittauksella. Tuloksia verrattiin kahteen referenssimittaukseen, jotka oli toteutettu kiihtyvyys- ja paikka-antureilla. Tuloksia ei voitu yleistää, sillä mittaustulokset koskevat vain tämän tutkimuksen telaa. Tela, laakerit, laakerin tuenta ja perusta muodostivat pyörivän systeemin, mikä on aina yksilöllinen. Parametrit ja herätteet, jotka vaikuttavat telan käyttäytymiseen muuttuvat joka telassa. Kuitenkin samanlaista käyttäytymistä voidaan olettaa olevan myös toisissa joustavissa roottoreissa ja ne voidaan mitata samalla tavalla kuin tässä tutkimuksessa. Myöhemmässä tutkimuksessa voidaan saavuttaa lisäarvoa ja korrelaatioita laakerivoiman, siirtymämittauksen ja kiihtyvyysmittauksen välillä tieteellisiin ja käytännön tarkoituksiin dynaamisella laakerivoimamittauksella
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Nel, Johannes Daniel. "The development of a radial active magnetic bearing / J.D. Nel." Thesis, North-West University, 2004. http://hdl.handle.net/10394/542.

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This dissertation presents the development of a radial active magnetic bearing (AMB). With AMBs the rotor of a machine can be suspended in the air without any direct contact between the stator and the rotor. This makes it a frictionless bearing and eliminates the need for lubrication. The AMB system implements a feedback control system to control the position of the rotor. The aim of this project is to develop a radial AMB with an air gap of 1 mm and a rotation speed of 3000 rpm. Through this project basic knowledge of magnetic suspension is gained and expertise is established at the Engineering Faculty. The model can be used for further studies and as a demonstration model to illustrate the concept of AMBs. The model constitutes one radial AMB and one conventional ball bearing supporting a rigid shaft. The AMB system constitutes 1) electromagnets, 2) power amplifiers, 3) position sensors and 4) a control system. Inductive sensors measure the air gap between the shaft and the stator in the vertical and horizontal axis. The sensor signal is fed back to a controller that provides a control signal to the power amplifiers. The power amplifiers control the current through the electromagnets that apply a force on the shaft. The shaft is then suspended in the air. An air pressure turbine is used to propel the shaft up to 3000 rpm. A homopolar AMB configuration is implemented using mild steel for the electromagnets. The four electromagnets used in the system are designed in terms of a required force. Linear power amplifiers are designed to activate the electromagnets and to eliminate possible noise problems on the sensors. Inductive position sensors are implemented producing a dc voltage proportional to the size of the air gap. dSpace® software is used to implement the controller. A position sensor value is read in through an analog-to-digital converter channel and subtracted from a reference signal for the position. The error signal is then the input of the controller. The controller sends a control signal via the digital-to- analog converter to the power amplifiers. A PID controller is created in sirnulink®. With the aid of dSpace® software the controller is downloaded onto the dSpace card. Different tests are performed to characterise the system. The step responses in both axes are measured and the percentage overshoots and settling times are determined. Impulse disturbance tests at different speeds are used to calculate the dynamic stiffness and damping of the system. Stable suspension was achieved with the final AMB system at rotation speeds of 3000 rpm. The maximum deviation was found to be less than 0.11 mm from the centre position. The settling time was less than 0.4 s and with no steady state error. The developed AMB system has a relatively low dynamic stiffness. Future studies can be done to find the effect that each PID parameter has on the dynamic stiffness. It is recommended that the controller be implemented on an embedded microcontroller to eliminate the computer and the dSpace® card.
Thesis (M.Ing. (Electrical and Electronic Engineering))--North-West University, Potchefstroom Campus, 2005.
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Farkhondeh, Shahrbanoo. "Smart Journal Bearing with Controllable Radial Clearance, Design and Analysis." Cleveland State University / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=csu1497976252551497.

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Hossain, Mohammad Ahsan. "High temperature, permanent magnet biased, homopolar magnetic bearing actuator." Thesis, Texas A&M University, 2006. http://hdl.handle.net/1969.1/4174.

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The EEC (Electron Energy Corporation) in conjunction with the National Aeronautics and Space Administration is researching the magnetic bearings for an alternative to conventional journal or ball bearings. The purpose of this research was to design and develop a high-temperature (1000ºF) hybrid Magnetic Bearing using High Temperature Permanent Magnets (HTPM), developed by the EEC for high performance jet engines at high speeds that supply loads of 500 lbf. Another objective is to design and build a test rig fixture to measure the load capacity of the designed bearing. The permanent magnet bias of the Homopolar radial magnetic bearing reduces the amount of current required for magnetic bearing operation. This reduces the power loss due to the coil current resistance and improves the system efficiency because the magnetic field of the HTPM can suspend the major portion of the static load on bearing. A high temperature radial magnetic bearing was designed via an iterative search employing 3D finite element based electromagnetic field simulations. The bearing was designed to produce 500 lbf of force at 1000ºF and the design weight is 48 lbs. The bias flux of the Homopolar radial bearing is produced by EEC HTPM to reduce the related ohmic losses of an electromagnetic circuit significantly. An experimental procedure was developed to measure actual load capacity of the designed bearing at the test rig. All the results obtained from the experiment were compiled and analyzed to determine the relation between bearing force, applied current and temperature.
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Kern, Colin. "Betriebsverhalten von thermisch und mechanisch hoch beanspruchten kunststoffbeschichteten Radial-Mehrflächengleitlagern." Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-71977.

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Die vorliegende Arbeit verfolgte die Zielstellung der Substitution des etablierten Weißmetalls als Laufschicht von hydrodynamischen Mehrflächengleitlagern durch neuartige Kunststoffschichten. Dazu wurden vergleichende Bauteilversuche an Mehrflächengleitlagern mit verschiedenen Laufschichten und Bohrungsformen vorgenommen. Eine Zinnbasislegierung als Laufflächenbeschichtung diente dabei als Referenzwerkstoff. Zur Durchführung des Versuchsprogrammes kam ein vorhandener, messtechnisch neu konditionierter Turbinenlagerprüfstand zum Einsatz. Die Versuchsreihen haben durchweg positive Beurteilungen der Lagerkennwerte im untersuchten Betriebsbereich der neuen Lagervarianten ergeben. Die neuartigen Laufschichtvarianten erfüllten die hohen tribologischen und thermischen Anforderungen. Einzelne Abweichungen der ermittelten Kennwerte wurden zahlenmäßig dokumentiert und können mit bereits verfügbaren physikalischen Modellen beschrieben werden. Die Ergebnisse erwiesen sich als unabhängig von der Lagerbauform aber abhängig von der gewählten Schichtvariante. Die Untersuchungen zum Betriebsverhalten unter hydrodynamischer Dauerbelastung sowie im Mischreibungsgebiet und im Notlaufbetrieb führten zu teilweise unterschiedlichen Ergebnissen. Im Mischreibungsgebiet wiesen die untersuchten Lager kaum Unterschiede im Betriebsverhalten auf. Im Dauerversuch zeigten die Lager mit Weißmetall, Gleitlack und Keramikschicht hervorragende Eigenschaften. Die Variante Klüberplast besaß eine ungenügende Bindefestigkeit und führte zu plastischen Verformungen der Schicht infolge der hydrodynamischen Drücke. Im Notlaufbetrieb übertrafen die untersuchten Kunststoffvarianten die Standzeiten des Referenzwerkstoffs Weißmetall
The aim of this study was to identify and test an alternative liner material instead of common liner materials such as white alloy for multi-lobe radial bearings. For this purpose comparative tests with different radial bearings were carried out. The white alloy material was taken as a reference. In preparation for these test series, the measurement system of the turbine bearing test rig was upgraded. Experiments showed beneficial performances of the bearings with a plastic liner by evaluating the static and dynamic properties of different bearing geometries and liner thicknesses under a wide range of operating conditions. The new bearings fulfilled the high tribological and thermal requirements. Observed deviations of the determined parameters were documented in number and can be described with available physical models. The results were independent of the bearing type and depending on the selected liner material variant. The studies on operating performance in continuous operation in the mixed friction area and in dry running operation led to partially different results. The mixed friction tests showed little difference in the examined stock performance. The bearings with white alloy, ceramic layer and bonded coating showed excellent fatigue properties of long-term experiment. On Klüberplast insufficient bonding strength and plastic deformation of the layer due to the hydrodynamic pressure was found. In the dry running operation the investigated polymers exceeded the lifetime of the referencematerial white alloy
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Zhu, Xiangzhen. "Design of radial displacement sensor and control of a switched reluctance machine with one bearing." Thesis, University of Leicester, 2006. http://hdl.handle.net/2381/30238.

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This project is focused on two objectives: X-Y displacement sensor design and design of switched reluctance motor with a magnetic bearing instead of mechanic bearings to support the rotor at one end. At the other end, a mechanical bearing is still used. Two types of design of low cost sensor for rotor displacement detection are presented. Both of them have very simple structure, which gives very low cost. The first presented sensor has the rotor with 12 poles permanent magnets on its surface. The experimental performance shows this sensor can detect the displacement, but it is not suitable for bearingless control because it doesn't have smooth output and can't work when motor stops. The second sensor design has a solid steel rotor and the experimental performance shows it can detect the displacement for bearingless control in terms of quick response and low cost. A magnetic bearing is realized in a single phase switched reluctance motor. The basic principle is that besides main winding, a radial force winding is employed on each stator tooth, which can generate the flux to balance the radial force in the airgaps so that the rotor can be self-supported. Mathematic analysis and simulation are pretend. The experimental results show that magnetic bearing can support the rotor in the central position regardless of the external force (within 12 N) acting on the rotor shaft. Bearingless control on a two phase switched reluctance motor with only one bearing is also designed. In the experiment, a proper switching point is chosen, which is for the control switching between two phases. Experimental results show that rotor can run with only one magnetic bearing support at 250 rpm. Although the running speed is very low, it is an important step for further research on bearingless control design.
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Choudhry, Vivek Vaibhav. "Experimental evaluation of wire mesh for design as a bearing damper." Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/1233.

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Wire mesh vibration dampers have been the subject of some very encouraging experiments at the Texas A&M Turbomachinery laboratories for the past several years and have emerged as an excellent replacement for squeeze film dampers. Their capability to provide damping for a wide range of temperatures (even cryogenic), fluid free operation and ability to perform even when soaked with lubricants makes them a suitable option as a bearing damper. Experiments were conducted to investigate the effect of design parameters like axial thickness and axial compression that influence the characteristics of wire mesh as a bearing damper. Two groups of wire mesh were tested to show that the stiffness and damping are directly proportional to the axial thickness, if all the other parameters are kept constant. Tests on four wire mesh donuts of different radial thickness showed that stiffness and damping vary inversely with radial thickness. Rigorous tests were also conducted to quantify the effects of axial compression, radial interference and displacement amplitude on stiffness and damping of the wire mesh. Another novel kind of mesh damper tested was comprised of two small segments instead of a whole donut. The results showed that wire mesh exhibited good damping characteristics even when used in small segments. Empirical expressions were developed using MathCADTM worksheets, and an existing ExcelTM design worksheet was modified to include these factors. The effect of frequency variation was also included to give a comprehensive design tool for wire mesh. A new design worksheet was developed that can predict rotordynamic coefficients for a wire mesh bearing damper having a different size as well as different installation and operational conditions.
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Chatzisavvas, Ioannis [Verfasser], Bernhard [Akademischer Betreuer] Schweizer, and Wolfgang [Akademischer Betreuer] Seemann. "Efficient Thermohydrodynamic Radial and Thrust Bearing Modeling for Transient Rotor Simulations / Ioannis Chatzisavvas ; Bernhard Schweizer, Wolfgang Seemann." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2018. http://d-nb.info/116838088X/34.

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Pavani, Renan Augusto. "Mancal magnético passivo radial por atração combinado com mancal de escora." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-19072016-115451/.

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Mancais são elementos importantes para o funcionamento adequado de muitos conjuntos mecânicos. Sendo assim, o contínuo desenvolvimento de novos tipos de mancais permite melhorar as condições atuais de funcionamento de dispositivos com necessidades específicas. Além disso, novos mancais proporcionam novos recursos para novos projetos. Este trabalho visa investigar a funcionalidade de um novo tipo de mancal rotativo híbrido resultante da combinação de um par de mancais magnéticos radiais passivos com um par de mancais de escora. Na direção radial, o eixo é mantido em posição central graças a dois mancais magnéticos compostos por imãs permanentes. Na direção axial, a restrição do movimento é devido a um par de mancais de escora localizados nas extremidades do eixo. Pelo ajuste do entreferro de cada par magnético é possível minimizar a carga axial que age em cada mancal de escora. Por meio de estudos baseados no método dos elementos finitos e experimentações, pretende-se esclarecer a relação entre os parâmetros construtivos e o desempenho do mancal. Os experimentos envolvem a verificação do desempenho do mancal por meio de um conjunto para testes, bem como um estudo de caso. O conjunto para testes possibilitou um ensaio de desgaste acelerado, onde uma esfera de aço, utilizada como pivô, manteve contato com uma superfície de PVC rígido. Tal ensaio resultou em um desgaste desprezível da superfície de contato devido à aplicação do novo conceito proposto, validando o mancal híbrido. Em relação ao estudo de caso, o mancal proposto foi empregado em uma bomba centrífuga representando um dispositivo de assistência ventricular, sendo seu desempenho discutido. Através da comparação entre algumas configurações possíveis para este tipo mancal, a rigidez radial é apresentada e discutida. Embora não constitua objeto principal deste trabalho, são discutidos os aspectos ligados ao desgaste causado pelo contato decorrente do uso dos mancais de escora, analisando o benefício do uso conjunto do mancal magnético com o mancal de escora. A expectativa é a de que este tipo de mancal possa ser utilizado em aplicações onde a existência de uma força resultante na direção radial seja muito pequena se comparada com os esforços presentes na direção axial.
Bearings are important elements for the proper working of many mechanical assemblies. Thus, the continuous development of new types of bearings improves the current operating conditions of devices with specific needs. In addition, new bearings provide new resources for new projects. This research aims to investigate the functionality of a new type of hybrid rotational bearing that combines a pair of radial magnetic bearing with a pair of thrust bearings. In the radial direction, the central axis is kept in position due to two magnetic bearings comprising permanent magnets. In the axial direction, the movement is constrained due to a pair of thrust bearings located at the shaft ends. By adjusting the air gap of each magnetic pair, it is possible to minimize the axial load that acts on each thrust bearing. Through studies based on finite elements methods and experiments, the relationship between the constructive parameters and the performance of the bearing are clarified. The experiments involve the performance checking of the proposed bearing through a test bed and a case study. The test bed allows an accelerated wear test, using a steel sphere as pivot against a rigid PVC surface. This test showed that the wear of PVC contact surface was negligible due to the applications of the proposed bearing concept, validating the hybrid bearing. Regarding the case study, the bearing was used in a centrifugal pump representing a ventricular assist device, and so the performance was discussed. By comparing some possible settings for this bearing type, the radial stiffness is presented and discussed. Although it is not the main goal of this paper, it was discussed the aspects related to the wear caused by contact from the use of thrust bearings in order to analyze the benefits of using magnetic bearing with the thrust bearing. The expectation is that this type of bearing can be used in applications where there is a very small net force acting in the radial direction compared with forces acting in the axial direction.
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Vincenc, Jan. "Laboratorní simulátor pro studium radiálních kluzných ložisek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-319274.

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The master’s thesis deals with a design of a radial journal bearing simulator, which is ready to implement a transparent sapphire journal bearing to an optical observation of the oil film. The first part of this thesis contains a short review of a few currently used journal bearing test rigs. The next part of the work deals with a discussion of concept variants and a definition of important parameters. The last part contains a detailed description of the designed radial journal bearing simulator. Limitations of the designed simulator and recommendations for future improvements are also discussed. The result of the presented work is the designed journal bearing simulator which will allow observing of the oil film. The work also consists a complete design documentation.
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Books on the topic "Radial bearing"

1

Radil, Kevin. The role of radial clearance on the performance of foil air bearings. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2002.

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Institute, American National Standards. Shaft and housing fits for metric radial ball and roller bearings (except tapered roller bearings) conforming to basic boundary plans. Washington, D.C: Anti-Friction Bearing Manufacturers Association, 1988.

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The radical prayer: Will you respond to the appeal of Jesus? Hagerstown, MD: Autumn House Pub., 2008.

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Bauld, Nathan L. Radicals, ion radicals, and triplets: The spin-bearing intermediates of organic chemistry. New York: Wiley-VCH, 1997.

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21st century faith: Radical mission in a new millennium. London: Marshall Pickering, 2000.

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Duigon, Mark T. Formation geochemistry at two boreholes and its bearing on radium content of ground water, Anne Arundel County, Maryland. Baltimore, Md: Maryland Dept. of Natural Resources, Maryland Geological Survey, 2003.

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United States. National Transportation Safety Board. Special investigation report: Emergency fire apparatus. Washington, D.C: National Transportation Safety Board, 1991.

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United States. National Transportation Safety Board. Special investigation report: Medium/heavy truck wheel separations. Washington, D.C: National Transportation Safety Board, 1992.

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Board, United States National Transportation Safety. Special investigation report: Runway incursions at controlled airports in the United States. Washington, D.C: The Board, 1986.

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United States. National Transportation Safety Board. Special investigation report: Railroad yard safety -- hazardous materials and emergency preparedness. Washington, D.C: The Board, 1985.

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Book chapters on the topic "Radial bearing"

1

Chen, Y. X., and S. N. Yang. "Dynamic Measurement of Bearing Radial Clearances." In Key Engineering Materials, 361–66. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-977-6.361.

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Betancor, Javier, M. Necip Sahinkaya, and Yahya H. Zweiri. "Radial Active Magnetic Bearing Design Optimization." In Mechanisms and Machine Science, 321–34. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99262-4_23.

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Boden, Karl. "Wide-Gap, Electro-Permanentmagnetic Bearing System with Radial Transmission of Radial and Axial Forces." In Magnetic Bearings, 41–52. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-51724-2_5.

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Fremerey, Johan K. "Radial Shear Force Permanent Magnet Bearing System with Zero-Power Axial Control and Passive Radial Damping." In Magnetic Bearings, 25–31. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-51724-2_3.

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Adams, Maurice L. "Journal Bearing and Radial Seal Rotor Dynamics." In Rotating Machinery Research and Development Test Rigs, 49–63. Boca Raton : Taylor & Francis, CRC Press, [2017]: CRC Press, 2017. http://dx.doi.org/10.1201/9781315116723-4.

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Novotný, Pavel, and Jozef Dlugoš. "Innovative Model of Radial Fluid Bearing for Simulations of Turbocharger Rotordynamics." In Advances in Intelligent Systems and Computing, 356–63. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-65960-2_44.

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Huang, Meifa, Zhiyong Liu, Guozhen Ding, and Yanyan Jiang. "Intelligent Design of Radial Clearance of Rolling Bearing Based on Ontology." In Lecture Notes in Electrical Engineering, 686–98. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9441-7_72.

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Shelke, Santosh N., and R. V. Chalam. "Optimum Power Loss in Eight Pole Radial Magnetic Bearing: Multi Objective Genetic Algorithm." In Communications in Computer and Information Science, 72–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25734-6_12.

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Zapoměl, Jaroslav, Petr Ferfecki, Jan Kozánek, Jan Košina, and Jan Cibulka. "Vibration of a Rigid Vertical Rotor Supported by a Shear Radial Magnetic Bearing." In Advances in Mechanism Design III, 183–90. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-83594-1_19.

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Atanasovska, Ivana D., Dejan B. Momcilovic, Radivoje M. Mitrovic, Natasa D. Soldat, and Nikola Nesic. "Nonlinear Dynamics as a Tool in Selection of Working Conditions for Radial Ball Bearing." In IUTAM Symposium on Exploiting Nonlinear Dynamics for Engineering Systems, 49–58. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23692-2_5.

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Conference papers on the topic "Radial bearing"

1

Farkhondeh Biabnavi, Shahrbanoo, and Majid Rashidi. "Journal Bearing With Controllable Radial Clearance." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86748.

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This work presents the novel design of a smart hydrodynamic journal bearing with adjustable radial clearance. The dynamic behavior of this bearing was mathematically modeled and examined. Finite Element Analyses were conducted to determine the effort needed to change and maintain a desired value for the radial clearance. First, the bearing set was modelled as a two-degrees-of-freedom dynamic system. For an initial value of a radial clearance of c = 0.0508 mm, the bearing set exhibited an unstable behavior under its postulated operating condition. A Generic Algorithm (GA) was used to define an objective function so that an optimum value of c could be determined in order to ring the bearing into a stable operating condition. The GA determined the value of radial clearance of c = 0.0051 mm for this purpose. Second, a Jeffcott rotor was modeled as an eight-degrees-of-freedom vibratory stem supported by two identical smart bearings. For an initial value of c = 0.025 mm, the disk’s peak-to-peak vibrations amplitude was determined to be 8 × 10−5 meter and 8.5 × 10−5 m along two orthogonal axes of a reference frame respectively. The GA was used to determine a new value for the radial clearance of the supporting bearings in order to reduce the disk’s vibration level. A new value of radial clearance c was determined to be 0.095 mm which in turn reduced the vibrations of the dick from 8 × 10−5 and 8.5 × 10−5 meter to 3.5 × 10−5 and 2.5 × 10−5 m respectively.
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Honavara Prasad, Srikanth, and Daejong Kim. "Scaling Laws of Radial Clearance and Bump Stiffness of Radial Foil Bearings." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-56704.

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Design and analysis of foil bearings involve consideration to various physical aspects such as fluid pressure, structural deformation and heat generation due to viscous effects within the bearing. These complex physical interactions are mathematically governed by highly nonlinear partial differential equations. Therefore, foil bearing design involves detailed calculations of flow fields (velocities, pressures), bump deflections (structural compliance) and heat transfer phenomena (viscous dissipation in the fluid, frictional heating, temperature profile etc.). The computational effort in terms of time and hardware requirements make high level engineering analyses tedious which presents an opportunity for development of rule of thumb laws for design guidelines. Scaling laws for bearing clearance and bump stiffness of radial foil bearings of various sizes are presented in this paper. The scaling laws are developed from first principles using the scale invariant Reynolds equation and bump deflection equation. Power law relationships are established between the 1) radial clearance and bearing radius and 2) bump stiffness and bearing radius. Simulation results of static and dynamic performance of various bearing sizes following the proposed scaling laws are presented.
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Shuai, Lv, Li Dongming, and Shen Wenqiang. "Research on Bearing Capacity Parameters of Radial Enveloping Ultrasonic Levitation Bearing." In 2020 3rd World Conference on Mechanical Engineering and Intelligent Manufacturing (WCMEIM). IEEE, 2020. http://dx.doi.org/10.1109/wcmeim52463.2020.00174.

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Swanson, Erik E., and P. Shawn O’Meara. "The Wing Foil: A Novel Compliant Radial Foil Bearing Design." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63185.

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To meet the challenging demands for high performance, affordable compliant foil bearings, a novel compliant support element has been developed. This recently patented, novel support element uses a multidimensional array of multiple, formed, cantilever “wing foil” tabs. The wing foil bearing has all the features required to achieve state of the art performance (Gen III for radial bearings). This paper describes two radial foil beings using the wing foil and the unique design features. Test data for a 31.75 mm diameter bearing operating in air and in steam up to 42 krpm are presented to demonstrate the performance of this bearing. It is shown to have low subsynchronous vibration and reasonable damping through rigid shaft critical speeds.
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Klit, Peder, and Anders Volund. "Shaft Center Orbit in Dynamically Loaded Radial Bearings." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64036.

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The bearing damping coefficients may be utilized to estimate the orbit for a dynamically loaded journal bearing. The classical method for this analysis was developed by Booker [1] in 1965. Several authors have refined this method over the years. In 1966 Jorgen W. Lund [2] published an approach to find the dynamic coefficients of a journal bearing by a first order perturbation of the Reynold’s equation. These coefficients made it possible to perform a rotor-bearing stability analysis for a statically loaded bearing. In the mid seventies Jorgen W. Lund pointed out in lecture notes that the dynamic damping coefficients of the bearing could be used to find the shaft orbit for dynamically loaded bearings. The connection between the “Booker Mobility Method” and the “Lund Damping Coefficient Method” will be explained.
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Yamamoto, R. I., and O. Horikawa. "Magnetic bearing with uniaxial control using radial layers repulsive type magnetic bearing." In 2017 IEEE International Magnetics Conference (INTERMAG). IEEE, 2017. http://dx.doi.org/10.1109/intmag.2017.8007868.

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Estupinan, Edgar A., and Ilmar F. Santos. "Controllable Radial Oil Injection Applied to Main Engine Bearings: Hybrid Bearing Configurations and Control Pressure Rules." In STLE/ASME 2010 International Joint Tribology Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ijtc2010-41170.

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In order to reduce friction losses and vibrations in main engine bearings, fluid film lubrication is combined to controllable radial oil injection. This work evaluates different geometric hybrid bearing configurations and control pressure rules for applying radial oil injection in main engine bearings of internal combustion engines. The conventional hydrodynamic lubrication (CHL) is combined with hydrostatic lubrication which is actively modified by radially injecting oil at controllable pressures, through orifices circumferentially located around the bearing surface. The behaviour of a main bearing of a medium size combustion engine, operating with radial oil injection and with four different control strategies is analyzed, giving some insights into the minimum fluid film thickness (OFT) and reduction of viscous friction losses. The behaviour of such parameters is compared to the case when the bearing operates with conventional hydrodynamic lubrication.
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De Choudhury, Pranabesh. "Rotor Bearing System Design on Magnetic Bearings." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0506.

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Abstract The rotordynamic analysis of a high speed multistage centrifugal compressor supported on radial magnetic bearings, which has been running successfully in the field for 9000 hours to date, is presented. Iterations required to achieve an acceptable rotor configuration using magnetic bearings are discussed. The results of the rotor-bearing system on standard fluid film five shoe tilting pad journal bearings are compared to the dynamics of the rotor on magnetic bearings. Correlation of the observed peak responses with those predicted on magnetic bearings is presented. The actual orbit plots and frequency plots during the coastdown of the rotor-bearing system on auxiliary ball bearings are discussed.
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Hemenway, Nicholas R., and Eric L. Severson. "Analysis of the Three Pole Radial Magnetic Bearing." In 2019 IEEE International Electric Machines & Drives Conference (IEMDC). IEEE, 2019. http://dx.doi.org/10.1109/iemdc.2019.8785382.

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Salles, Bruno, Marco Lúcio Bittencourt, Robson Cruz, Luiz Antonio Galli, and Durval Duarte. "Radial Surface Bearing Optimization for Internal Combustion Engines." In SAE Brasil 2009 Congress and Exhibit. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2009. http://dx.doi.org/10.4271/2009-36-0191.

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Reports on the topic "Radial bearing"

1

Brown, Richard S., Thomas J. Carlson, Abigail E. Welch, John R. Stephenson, Cary S. Abernethy, Craig A. McKinstry, and Marie-Helene Theriault. Assessment of Barotrauma Resulting from Rapid Decompression of Depth Acclimated Juvenile Chinook Salmon Bearing Radio Telemetry Transmitters. Office of Scientific and Technical Information (OSTI), September 2007. http://dx.doi.org/10.2172/914683.

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