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Relevant bibliographies by topics / Bearing Power Loss

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Academic literature on the topic 'Bearing Power Loss'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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Journal articles on the topic "Bearing Power Loss"

1

Zheng, De-Xing, W. F. Chen, Guanyun Xiao, and Dateng Zheng. "Effect of vibration on power loss of angular contact ball bearings." Industrial Lubrication and Tribology 72, no. 5 (2019): 657–64. http://dx.doi.org/10.1108/ilt-06-2019-0217.

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Purpose This paper aims to devote to the experimental analysis and modeling on the heat generation of angular contact ball bearings under vibration. Design/methodology/approach The experiments about vibration effect on bearing temperature are implemented. To explore the causes of bearing temperature rise, the shaft-bearing system is first simplified to a forced vibration model to analyze the bearing loads in vibration. Next, the vibratory-induced additional load is proposed and the spin power loss of balls is re-derived under vibration. The vibration-induced heat is integrated into a novel for

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Jiang, Shuyun, and Yujiang Qiu. "Reducing friction power losses of flywheel energy storage systems using PTFE composites: A technical note." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 10 (2019): 1616–21. http://dx.doi.org/10.1177/1350650119836817.

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This technical note aims to reduce friction power loss of flywheel energy storage system (FESS) supported by hydrodynamic spiral groove bearing and permanent magnetic bearing (PMB). An approach is proposed to fabricate the spiral groove bearing using polytetrafluoroethylene (PTFE) composite. A test rig is developed to test tribological properties of the spiral groove PTFE bearings. Also, two PTFE composites (C-PTFE: 80 vol.% PTFE filled with 20 vol.% graphite; C-Cu-PTFE 50 vol.% PTFE filled with 20 vol.% graphite and 30 vol.% copper powder) are tested. Results show that the friction power loss

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3

Li, Junning, Jiafan Xue, and Zhitao Ma. "Study on the Thermal Distribution Characteristics of High-Speed and Light-Load Rolling Bearing Considering Skidding." Applied Sciences 8, no. 9 (2018): 1593. http://dx.doi.org/10.3390/app8091593.

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Skidding, which frequently occurs in high-speed rolling bearings, has a significant effect on the thermal distribution and service reliability of the bearings. An improved theoretical model of friction power loss distribution in high-speed and light-load rolling bearings (HSLLRBs) considering skidding is established, and the effects of various operating parameters on the friction power loss are investigated. The results show that the friction power loss of the inner ring and outer ring as well as the total friction power loss of the bearing increase as the slip ratio increases, but that the fr

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Wasilczuk, Michal, and Grzegorz Rotta. "On the Possibilities of Decreasing Power Loss in Large Tilting Pad Thrust Bearings." ISRN Tribology 2013 (January 14, 2013): 1–9. http://dx.doi.org/10.5402/2013/732790.

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Different systems of direct oil supply have been developed in order to facilitate efficient introduction of fresh lubricant to the oil gap and reduction of churning power loss in tilting pad thrust bearings. Up to now there is no documented application of the supply groove in large thrust bearings used in water power plants. The results of modeling lubricant flow in the lubricating groove of a thrust bearing pad will be presented in the paper. CFD software was used to carry out fluid film calculations. Such analysis makes it possible to modify groove geometry and other parameters and to study

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Kasarda, M. E. F., P. E. Allaire, P. M. Norris, C. Mastrangelo, and E. H. Maslen. "Experimentally Determined Rotor Power Losses in Homopolar and Heteropolar Magnetic Bearings." Journal of Engineering for Gas Turbines and Power 121, no. 4 (1999): 697–702. http://dx.doi.org/10.1115/1.2818529.

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The identification of parameters that dictate the magnitude of rotor power losses in radial magnetic bearings is very important for many applications. Low loss performance of magnetic bearings in aerospace equipment such as jet engines and flywheel energy storage systems is especially critical. Two basic magnetic bearing designs are employed in industrial practice today: the homopolar design, where the flux paths are of a mixed radial/axial orientation, and the heteropolar design, where the flux paths are primarily radial in nature. The stator geometry and flux path of a specific bearing can h

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Patel, Dilip C., and Deepak P. Vakharia. "Determination of Friction Coefficient in Floating Bush Bearings by Strain Gauge Method." International Journal of Automation Technology 4, no. 4 (2010): 389–93. http://dx.doi.org/10.20965/ijat.2010.p0389.

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A floating bush bearing is a kind of journal bearing in which the bushing will float between the journal and bearing. Knowing the frictional coefficient is important for the determination of wear loss and power loss conditions; an appropriate test rig is used to determine friction of floating bush bearings. The frictional coefficient of bearings in dry and lubricated conditions has been examined in experiments.

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Turnbull, R., R. Rahmani, and H. Rahnejat. "The effect of outer ring elastodynamics on vibration and power loss of radial ball bearings." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 234, no. 4 (2020): 707–22. http://dx.doi.org/10.1177/1464419320951398.

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Ball bearings are an integral part of many machines and mechanisms and often determine their performance limits. Vibration, friction and power loss are some of the key measures of bearing performance. Therefore, there have been many predictive analyses of bearing performance with emphasis on various aspects. The current study presents a mathematical model, incorporating bearing dynamics, mechanics of rolling element-to-races contacts as well as the elastodynamics of the bearing outer ring as a focus of the study. It is shown that the bearing power loss in cage cycles increases by as much as 4%

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Kumar, Vivek, Satish C. Sharma, and Kuldeep Narwat. "Influence of micro-groove attributes on frictional power loss and load-carrying capacity of hybrid thrust bearing." Industrial Lubrication and Tribology 72, no. 5 (2019): 589–98. http://dx.doi.org/10.1108/ilt-07-2019-0278.

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Purpose Micro-surface texturing is emerging as a possible way to enhance the tribological performance of hydrodynamic fluid film bearings. In view of this, numerical simulations are carried out to examine the influence of surface texture on performance of hybrid thrust bearing system. This paper aims to determine optimum attributes of micro-grooves for thrust bearing operating in hybrid mode. Design/methodology/approach An iterative source code based on finite element formulation of Reynolds equation has been developed to numerically simulate flow of lubricant through the bearing. Mass-conserv

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Zong, Ming, Xiao Kang Wang, and Yang Cao. "Permanent Magnet Biased Bearing of Suspension System." Advanced Materials Research 383-390 (November 2011): 5529–35. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.5529.

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PM (Permanent Magnet) biased magnetic bearing with PM to replace the magnetic field produced by electromagnet an Active Magnetic Bearing generated static bias magnetic field, it can reduce the power consumption of power amplifier to reduce the number of turns of magnet safety, reduce the volume of magnetic bearings, reducing electromagnetic coil operating current, thereby reducing the power amplifier power control system and heat sink size, magnetic bearings significantly reduce power loss, and fundamentally reduce the cost of bearing. In this paper, a kind of PM biased magnetic bearings, desc

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Kwon, Hyun Sik. "Investigation of the Influences of Thrust Loads Resulted by Helix Angle Directions of Planetary Gear Sets on Bearing Power Losses in Automotive Planetary Gear Trains." Applied Sciences 11, no. 19 (2021): 8827. http://dx.doi.org/10.3390/app11198827.

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In the recent automotive industries, automotive technologies for improving fuel efficiency have focused on the developments of reducing power losses in a transmission. As a well-developed and conventional power transmitting system, an automatic transmission is still widely used in many automotive vehicles. The automatic transmission is co-axially designed with several planetary gear sets and other mechanical parts. The co-axial arrangements and gear helix angles make the transmission necessarily include bearings for supporting loads and allowing relative rotations. In this study, the influence

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Dissertations / Theses on the topic "Bearing Power Loss"

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Stilwell, Alex William. "An Experimental Study of Power Losses of Full-complement Needle Bearings of Planetary Gear Sets." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1337360042.

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Talbot, David C. "An Experimental and Theoretical Investigation of the Efficiency of Planetary Gear Sets." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1330630066.

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Sawadkosin, Paranee. "Optimalizace tvaru strojních součástí s vlivem variabililty vstupních údajů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401572.

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The objective of this Master’s thesis is to find shape optimal design based on min- imizing friction force of thrust bearing by using genetic algorithm(GA) which is one of an optimization toolbox in Matlab. Reducing the friction force of thrust bearing is one way of making shaft to decreasing friction losses. With four parameters of thrust bearing geometry number of segments(m), angle of running surface(), segment inner radius(R0), and segment outer radius(R1) substitute in Reynolds’ equation. In order to know friction force, it is necessary to generate a connecting variable, oil film thicknes

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Denni, Martin. "Dynamic behaviour of cylindrical roller bearing working in a centrifugal field for planetary gearbox applications." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI096.

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Dans un objectif permanent de réduction de consommation des turboréacteurs, les constructeurs aéronautiques souhaitent atteindre de meilleurs rendements en augmentant la vitesse de l'ensemble compresseur-turbine. Afin de limiter la vitesse de la soufflante, un étage de réduction épicycloïdal doit être inséré entre la soufflante et le compresseur. Du fait de leur bonne tenue en cas de défaillance du circuit de lubrification, les roulements sont souvent privilégiés aux paliers hydrodynamiques pour les applications aéronautiques. Cependant, dans le cas des trains épicycloïdal, les roulements sont

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Vedera, Kevin G. "An Experimental Methodology for Evaluating Power Losses of Rolling Element Bearings Subjected to Combined Radial and Axial Loads." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1522933829712819.

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Brossier, Pierre. "Combined analytical and empirical modelling of power losses in rolling element bearings." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI081.

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Le développement de l’industrie du transport conduit la conception de transmissions mécaniques de puissance toujours plus légères et efficientes. Les composants de ces transmissions doivent supporter des efforts transmis dans des environnements de plus en plus restreints. Du fait que les carters soient devenus de plus en plus compacts, les systèmes de refroidissement se sont aussi complexifiés. C’est dans ce contexte que les paliers à roulement, plus communément appelés roulements, doivent produire moins de chaleur, opérer dans des espaces plus proches des engrènements, tout en ayant des durée

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Coimbra, António João Monteiro Paiva. "Power loss in cylindrical roller thrust bearings lubricated with automotive gear oils." Dissertação, 2015. https://repositorio-aberto.up.pt/handle/10216/79527.

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Coimbra, António João Monteiro Paiva. "Power loss in cylindrical roller thrust bearings lubricated with automotive gear oils." Master's thesis, 2015. https://repositorio-aberto.up.pt/handle/10216/79527.

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Fernandes, Carlos Miguel da Costa Gomes. "Power loss in rolling bearings and gears lubricated with wind turbine gear oils." Tese, 2015. https://repositorio-aberto.up.pt/handle/10216/78594.

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Fernandes, Carlos Miguel da Costa Gomes. "Power loss in rolling bearings and gears lubricated with wind turbine gear oils." Doctoral thesis, 2015. https://repositorio-aberto.up.pt/handle/10216/78594.

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Books on the topic "Bearing Power Loss"

1

Fire Evangelism: Reaching the Lost through Love and Power. Chosen, 2006.

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Clasen, Mathias. Vampire Apocalypse. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190666507.003.0007.

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Richard Matheson’s 1954 horror novel I Am Legend depicts the sole survivor of a vampire pandemic in his attempts to find companionship and meaning in a blasted apocalyptic world. Most literary critics engaging with the novel have interpreted the vampires as social or psychological symbols. They’ve overlooked their literal resonance as disease-bearing, unnatural predators well designed to activate evolved fears of predation and contagion. The chapter argues that the novel’s lasting power comes from the way Matheson taps into basic human anxieties—over predation, isolation, and a total loss of m

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Faiz, Asma. In Search of Lost Glory. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780197567135.001.0001.

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This book traces the trajectory of Sindhi nationalism in its quest for lost glory. It examines the Sindhi nationalist movement through its various stages, ranging from pre-partition identity construction in pursuit of the separation of Sindh from Bombay, to the post-partition travails of a community which lost its identity and its capital as a result of the arrival of millions of migrants from India (Muhajirs) and of the actions of an over-bearing central government. Going beyond the state and its power play, the book examines the long history of Sindhi-Muhajir contestation for resources in th

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Otis, Laura. Banned Emotions. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190698904.001.0001.

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Who benefits, and who loses, when emotions are described in particular ways? How can metaphors such as “hold on” and “let go” affect people’s emotional experiences? Banned Emotions draws on the latest research in neuroscience and psychology to challenge popular ideas about emotions that should supposedly be suppressed. This interdisciplinary book breaks taboos by exploring emotions in which people are said to “indulge”: self-pity, prolonged crying, chronic anger, grudge-bearing, bitterness, and spite. By focusing on metaphors for these emotions in classic novels, self-help books, and popular f

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Book chapters on the topic "Bearing Power Loss"

1

Zhang, Zh. "Power Loss Due to Bearing Frictions." In Pelton Turbines. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31909-4_14.

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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. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25734-6_12.

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Neisi, Neda, Eerik Sikanen, Janne E. Heikkinen, Teemu Sillanpää, and Jussi Sopanen. "Power Loss and Temperature Growth in the Backup Bearing of AMB-Supported High-Speed Electric Motor During a Dropdown." In Mechanisms and Machine Science. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99262-4_11.

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Chatterton, Steven, Paolo Pennacchi, and Andrea Vania. "Optimized Tribo-Design of Lubricants for Power Loss Reduction in Journal Bearings Used in Process Industry." In Mechanisms and Machine Science. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99262-4_32.

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"Kinematic Speeds, Friction Torque, and Power Loss." In Essential Concepts of Bearing Technology. CRC Press, 2006. http://dx.doi.org/10.1201/9781420006599-13.

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"Kinematic Speeds, Friction Torque, and Power Loss." In Rolling Bearing Analysis - 2 Volume Set. CRC Press, 2006. http://dx.doi.org/10.1201/9781482275148-32.

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Gardner, Willis W. "Tilting Pad Thrust Bearing Tests - Influence of Oil Flow Rate on Power Loss and Temperatures." In Tribology Series. Elsevier, 1998. http://dx.doi.org/10.1016/s0167-8922(98)80076-x.

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Chittenden, R. J., D. Dowson, and C. M. Taylor. "Power loss prediction in ball bearings." In Tribological Design of Machine Elements, Proceedings of the 15th Leeds-Lyon Symposium on Tribology held at Bodington Hall, The University of Leeds. Elsevier, 1989. http://dx.doi.org/10.1016/s0167-8922(08)70204-9.

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Rano, Ruma. "Characterization of Magnetic and Non-Magnetic Components From a Low Carbon Fly Ash." In Global Perspectives on Air Pollution Prevention and Control System Design. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7289-3.ch002.

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Low carbon coal ash—a solid air pollutant from super thermal power plant using pulverized fuel combustor—has been characterized in respect of its physico-chemical, mineralogical, and morphological features. Size-classified fractions with their magnetic and non-magnetic components have also been characterized. Low loss on ignition and particle size distribution profile shows fly ash has high utility. The magic number,10 µm, is attained by greater % of particles. The particles with diameter 50 µm occupy population density of 93%. SEM-EDS reveals that particles are mostly globular with high surface enrichment of Al/Si indicating that it will act as un-reactive inert fillers. In magnetic components, various types of Fe bearing phase are present with less porous and more regular shape than non-magnetic components. Finer fractions have high content of magnetite which is expected to help in coal beneficiation. The finer non-magnetic fraction is a source of alumino-siliceous material for synthesizing a novel solid acid or base catalyst for catalyzing industrially important organic reactions.

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Nelias, D., J. Seabra, L. Flamand, and G. Dalmaz. "Power Loss Prediction in High-Speed Roller Bearings." In Tribology Series. Elsevier, 1994. http://dx.doi.org/10.1016/s0167-8922(08)70332-8.

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Conference papers on the topic "Bearing Power Loss"

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Bruckner, R. J., and C. DellaCorte. "Gas Foil Journal Bearing Power Loss at High Ambient Pressure." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63543.

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The National Aeronautics and Space Administration’s (NASA) Exploration Initiative requires the reliable availability of electrical power, on the order of hundreds of kilowatts, for operating spacecraft electric ion engines, on-board instruments, and communications. Foil gas bearing performance in Helium-Xenon (He-Xe) gas mixtures at high ambient pressures is a critical issue in the design of these power conversion systems. The work describe herein is a combined experimental and analytic approach to predicting bearing power loss at these conditions. A high pressure test chamber is used to test

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Damian, Ioan, Ion Oancea, and Spiridon Cretu. "The Effect of Misalignment on Power Loss in Ball Bearings." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59113.

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A vectorial method has been developed to solve the quasi-static equilibrium in angular contact ball bearings. In the quai-static model the effects induced by the centrifugal forces, gyroscopic moments and misalignments between bearing’s rings were considered. The lubricant parameters, traction forces and fluid drag action on balls and raceways were further included in a quasi-dynamic model. An experimental study has been further carried out to validate the quasi-dynamic model when a certain degree of misalignment exists between the inner and outer rings of the bearing. Both numerical simulatio

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Strzelecki, S. "Power Loss of Tilting 5-Pad Journal Bearing Operating With Turbulent Oil Film." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63826.

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Journal bearings of high speed turbocompressors, compressors and heavy duty high speed turbine gearboxes operate at journal peripheral speeds like 150 m/s. The flow of lubricant in such bearings is not laminar but super laminar or turbulent. It results in the increase in power loss and in the decrease of the bearing stability. The ground for the safe operation of high speed journal bearings at proper oil film temperature and with less power loss is the full knowledge of bearing performances at the turbulent oil film.

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Cao, Jianming, Timothy Dimond, and Paul Allaire. "Reduction of Vibration and Power Loss in Industrial Turbochargers With Improved Tilting Pad Bearing Design." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42862.

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Turbochargers are commonly used in reciprocating compressors and internal combustion engines to improve overall efficiency, thereby reducing fuel requirements. In reciprocating compressor applications, turbochargers typically operate in the range of 15,000 rpm to 30,000 rpm. These turbomachines operate at higher rotational speed in automotive applications, often exceeding 100,000 rpm. These high speeds result in bearings that are often highly non-linear, with large limit cycle shaft orbits and high subsynchronous vibration levels. These large orbits also result in much higher power losses than

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Feng, N. S., and E. J. Hahn. "Rolling Element Bearing Non-Linearity Effects." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0391.

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Non-linearity effects in rolling element bearings arise from two sources, viz. the Hertzian force deformation relationship and the presence of clearance between the rolling elements and the bearing races. Assuming that centrifugal effects may be neglected and that the presence of axial preload is appropriately reflected in a corresponding change in the radial clearance, this paper analyses a simple test rig to illustrate that non-linear phenomena such as synchronous multistable and nonsynchronous motions are possible in simple rigid and flexible rotor systems subjected to unbalance excitation.

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Vedera, Kevin, Isaac Hong, David Talbot, Ahmet Kahraman, and Sen Zhou. "Power Loss Measurements of Rolling Element Bearings Subject to Combined Radial and Axial Loads." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97438.

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Abstract Power losses of load carrying gear and bearing components of automotive transmissions have become a major research area in recent years. Measurement of power loss of a gearbox is a routine task where losses from rolling element bearings, gear meshes and seals collectively define the total loss. However, separating bearing and gear mesh losses is not possible, as a gear mesh cannot be operated without support bearings. This study aims at developing a methodology for measuring power losses of rolling element bearings of different types operated under realistic load, speed and temperatur

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Walton, James F., Hooshang Heshmat, and Michael Tomaszewski. "Power Loss in High-Speed Micro Turbomachinery: An Experimental Study." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69558.

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In the paper the authors present the results of a study to investigate the windage and foil bearing losses in modern high-speed micro-turbomachinery such as motors, turboexpanders and turbogenerator rotor systems. Areas investigated include clearance between rotor and static structure; surface roughness; and ambient pressure conditions. Comparisons between experiments and theoretical windage loss models show excellent correlation at high speeds. Testing also indicated that some optimum rotor stator gaps are possible to minimize windage loss and that surface roughness can significantly impact w

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Wu, Peicai, Xingnan Liu, Guojun Yang, and Zhengang Shi. "The FEM Calculation of Iron Loss in the Active Magnetic Bearing." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30085.

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The active magnetic bearing (AMB) is a new kind of high-performance bearing which suspends the rotor with controlled electromagnetic force. It was chosen to support the rotor of the helium blower in HTR-PM instead of conventional bearings. The power losses in the active magnetic bearings compose of three components: copper loss, iron loss and windage loss. In this paper, the iron loss, which composes of the eddy current loss and the hysteresis loss, is researched. The power loss of silicon steel lamination (35H300) was measured. Experimental data was taken over a range of 50Hz to 25,000Hz (sin

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Goldman, Paul, Alex Petchenev, Donald E. Bently, and Agnes Muszynska. "Torque and Power Loss in a Cylindrical Fluid-Lubricated Bearing/Rotor System." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-408.

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The paper contains the study of the lubricant fluid forces applied to the journal in a cylindrical, externally-pressurized bearing. The analytical expressions take into account the appearance of fluid cavitation at high eccentricity level. The obtained expressions for fluid forces and torque are used for numerical simulation of a simple, one-mode rotor system. The system exhibits typical fluid whirl/whip instability which results in high fluid resistance torque values. The latter is considered as one of the causes of turbomachinery efficiency deterioration due to fluid-induced instabilities. T

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Cuesta, E. N., V. R. Rastelli, L. U. Medina, N. I. Montbrun, and S. E. Diaz. "Non-Linear Behaviors in the Motion of a Magnetically Supported Rotor on the Catcher Bearing During Levitation Loss: An Experimental Description." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30293.

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Recent developments improving load capacity foretell the practical implementation of Active Magnetic Bearings (AMB) on industrial level, pushed by the advantages of reduced wear and higher speeds that they make available. However, the possibility of an eventual power failure forces the use of back-up (catcher) bearings, which usually are of the ball bearing type. The back-up bearings present a clearance between the shaft and the inner race, such that there is not contact during normal operation. On a power failure or an emergency stop, the rotor is only supported by the catcher bearings. Thus,

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