Gotowe bibliografie tematyczne / Ball Bearings

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Gotowa bibliografia na temat „Ball Bearings”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 30 lipca 2024

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Artykuły w czasopismach na temat "Ball Bearings"

Cross, Rod. "Ball bearings and bearing balls". American Journal of Physics 89, nr 1 (styczeń 2021): 10. http://dx.doi.org/10.1119/10.0002859.

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Zhou, Hui, Jun Zheng, Ji Xing Hu, Rui Peng Sang i Zhi Hua Wan. "Study of MoS₂-Ti Composite Coatings Applied in Precision Ball Bearings". Advanced Materials Research 538-541 (czerwiec 2012): 281–85. http://dx.doi.org/10.4028/www.scientific.net/amr.538-541.281.

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708C Ball bearings were made of 9Cr18 steel which had precision of class 4, MoS2-Ti composite coatings were deposited on inner and outer races of ball bearings by unbalanced magnetron sputtering system, and bearing cages were made of PTFE-based self-lubricating polymers. Bearing’s tribological torques as a function of storage time in high humidity environment were studied by using LHU-2 thermal & humidity test chamber and Bearing 2000 torque measurement device. Developing bearing vacuum performance test rig to research bearing’s torque as a function of running time, bearings were dismantled after test and using XPS to analyze the surfaces of bearing’s races and balls. The results show that storied in the environment of 30°C, 85% RH, bearing’s running torques increased proportionally as the storage time went on. When run-in the bearings which were storied for 440 days, the start and average running torques of bearings could come back to the level which was the same as the test start, but the fluctuation of bearing’s average running torque increased. Running in one direction at the speed of 650 r/min, in vacuum environment (~10-4Pa) and ambient temperature, tested bearings showed good running performance with low friction torque varied only between 1g·cm~2 g·cm until to the test ended at 1.872×108 revolutions. XPS analysis showed that a stable and sustainable solid lubrication system was established among bearing’s races, balls and cages.

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Zhao, Yanling, Gang Zhou i Qiyu Wang. "Discrete Dynamics of Balls in Cageless Ball Bearings". Symmetry 14, nr 11 (25.10.2022): 2242. http://dx.doi.org/10.3390/sym14112242.

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Cageless ball bearings are often preferred as a back-up bearing for active magnetic bearings to support a falling rotor, but the contact between the balls of the cageless ball bearing may lead to the deterioration of the bearing performance and affect the dynamic stability of the rotor system. Thus, we studied the discrete dynamics of cageless ball bearings. First, a model is proposed to change the groove curvature center of the local outer raceway to control the ball velocity to achieve dispersion. Combined with the spatial geometry theory, the mathematical model of the discrete raceway is established, the collision between the balls is considered as an abruptly added constraint, and the non-smooth dynamics equation of the cageless ball bearing with a local discrete raceway is established. Then, the fourth-order Adams prediction correction algorithm is used to numerically solve the dynamic discretization of the ball, and the structural parameters of the discrete raceway are preferably selected, according to the phase diagram of the ball and the change in the angular spacing. The results show that the structure of the discrete raceway has a strong influence on the discrete dynamics of the ball.

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Иванов, Яков Николаевич, Олег Петрович Бадун, Сергей Алексеевич Дешевых i Александр Юрьевич Стрельченко. "ПАРАМЕТРИЧНІ КОЛИВАННЯ РОТОРУ ТУРБОНАСОСНОГО АГРЕГАТУ НА ШАРИКОПІДШИПНИКАХ". Aerospace technic and technology, nr 7 (10.11.2018): 56–61. http://dx.doi.org/10.32620/aktt.2018.7.08.

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This work is dedicated to the problem of ball bearings capacity on the turbopump assembly rotor. Many publications and books have been devoted to solve this problem. The result of research is benefit for designers, technologists and operatives. However, many important questions, which are concerning of ball bearings work, in engineering practice are not sufficiently disclosed. In favor of this is telling the statistic of development of high-speed rotor assemblies. In the total mass of turbopump assembly defects, which appear at the phase of developmental design, more the half of them are belong to the friction nodes, which are including the ball bearings too. The authors are present their own results of the experimental data, which were accumulated as result of the ball bearings tests on the special installation and as part of the turbopump assembly from a Liquid-Propellant Rocket Engine. The defects of ball bearings parts were described and analyzed. The main factors which are worsening the service life of ball bearings in consisting of the turbopump assembly were examined. The kinematics and force interaction of balls with bearing race were examined.In the final analysis was advanced the version of the cause of increased wear of ball bearings high-speed rotor, which consists of the assumption on that during the operation of the bearing, in the radial clearance mode, axial displacements of the balls occur, under the influence of the axial force generated by the flow of the cooling liquid. Also this article shows how these movements of the balls affect the load distribution between the bearing parts and their deterioration.It is assumed that in this mode of operation, in the system "rotor - ball bearing - body" may arise forced axial oscillations. These oscillations are suitable for the term perametric ocillations, since the energy is introduced to the oscillatory system by the periodically changing parameters of the system. In this case, this is the movement of balls, which is expended the energy of rotor rotation or the energy of the flow of cooling liquid.In support of the advanced version, the experimental data on the state of bearings №207Ю and №205Ю were given after the tests with different values of the flow of cooling liquid.

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Aktu¨rk, N., M. Uneeb i R. Gohar. "The Effects of Number of Balls and Preload on Vibrations Associated With Ball Bearings". Journal of Tribology 119, nr 4 (1.10.1997): 747–53. http://dx.doi.org/10.1115/1.2833880.

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In this paper, the radial and axial vibrations of a rigid shaft supported by a pair of angular contact ball bearings are studied. The effect on the shaft vibration of varying the preload and the number of balls in the bearings is investigated when the bearings are perfect. For perfect bearings the vibrations occur at the ball passage frequency. The amplitudes of these vibrations are shown to be considerably reduced if the preload and number of balls are correctly selected. All results show that the vibration characteristics of the shaft and its bearings change when the bearings operate in different regions of their nonlinear load-deflection characteristics. This implies that the preload and the number of balls in a ball bearing are two of the important governing parameters affecting its dynamic behavior and have to be considered at the design stage.

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Berrada, S., R. Serra, P. V. Dalen i C. Chastagner. "Impact of low inner ring waviness orders on hybrid ball bearing under high speeds". Proceedings of the International Conference on Condition Monitoring and Asset Management 2023, nr 1 (1.01.2023): 1–10. http://dx.doi.org/10.1784/cm2023.2f3.

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Deep groove ball bearings (DGBB) are widely used in rotating equipment in many fields among which we have electric vehicle Powerpack, so very demanding in terms of noise and vibration. Geometrical design, clearance, component material, and lubricant properties influence vibratory behavior and bearing life cycle. In rotating machines, bearings are acting as friction reducers to allow a smooth rotation but are also exciters inducing vibrations due to the rotation of ball set, even in the case of a theoretical perfect bearing. Bearing performance depends highly on contact surface quality (ring races and balls surface). In a ball bearing, contact surface quality results from several manufacturing processes (heat treatment, turning, grinding, honing and assembly) and directly affects the noise and vibration levels generated by the bearing in the application. Also, component materials and hardness will affect the contact forces between balls and rings path on rotating bearings. Hybrid bearings are known for their performance when operating under high rotation speeds. In this article, inner and outer ring low waviness orders are studied on Hybrid Deep Groove Ball Bearings (DGBB). Both numerical model and, experimental tests were carried out to study the effect of rings waviness on hybrid bearing under high rotation speed.

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Ohta, Hiroyuki, i Shinya Satake. "Vibrations of the All-Ceramic Ball Bearing". Journal of Tribology 124, nr 3 (31.05.2002): 448–60. http://dx.doi.org/10.1115/1.1456455.

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All-ceramic ball bearings with silicone nitride balls and silicone nitride rings were tested and the vibration characteristics were compared with those of hybrid ceramic ball bearings and conventional steel ball bearings. The vibration measurement results showed that the overall vibratory velocity levels of the all-ceramic ball bearings are influenced by rotational velocities, and do not change with axial loads. Under a given axial load and rotational velocity, the overall vibratory velocity level of the all-ceramic ball bearing is the lowest, and the hybrid ball bearing the highest. The frequencies of main peaks in the measured vibration spectra of the all-ceramic ball bearing are higher than the frequencies of the corresponding main peaks for the hybrid ceramic ball bearing and the steel ball bearing. To explain the main peaks, modal analysis was done and the relationship between peak and natural vibration was analyzed. The results of the analyses showed that the main peaks are caused by: (1) the mass-type natural vibration of the outer ring in the vertical direction, (2) the bending natural vibration of the outer ring in the radial direction, (3) the moment of inertia-type natural vibration of the outer ring in the angular direction, (4) the mass-type natural vibration of the outer ring in the axial direction, and (5) the bending natural vibration of the outer ring in the axial direction. We also discuss the generating mechanism of the vibration and present the calculation method of the vibration spectra. As a result, it is clear that the vibration spectra of the all-ceramic ball bearing are determined by the amplitude of the waviness of the raceways and ball surface, the mobility, and the non-linear spring constant associated with the contact between the raceways and balls.

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Ohta, Hiroyuki, i Takumi Nakagawa. "Using Ceramic Balls to Reduce Noise in a Linear Guideway Type Recirculating Linear Ball Bearing". Journal of Tribology 125, nr 3 (19.06.2003): 480–86. http://dx.doi.org/10.1115/1.1537264.

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A new method of reducing the noise of the linear guideway type recirculating linear ball bearing (linear bearing) was studied. In the experiments, the overall sound pressure levels of linear bearings with steel balls or ceramic Si3N4 balls were measured, and sound frequency analyses were carried out. Moreover, based on the assumption that the main cause of the noise may be the collision between the ball and the carriage, the overall sound pressure levels of the linear bearings were analyzed combining the Hertzian theory and the results of previous studies on collision sound. From the results of experiments and analyses, the conclusions were obtained as follows: (1) The overall sound pressure level of the linear bearing with steel balls can be reduced by about 4.5 dB by using Si3N4 balls having the same diameter; (2) The overall sound pressure levels of linear bearings with steel balls or ceramic Si3N4 balls were both increased by about 9.8 dB as the linear velocity increased an octave; and (3) The analytical results, based on the assumption that the main cause of the noise emitted from the linear bearings is the collision between the ball and the carriage, match the experimental results well.

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Zhao, Yang, Heng Liu i Bowen Fan. "Traction effects on the dynamics of ball bearings". Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 235, nr 4 (7.10.2021): 641–52. http://dx.doi.org/10.1177/14644193211047385.

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In the paper, a combined model of traction and ball bearings dynamics is established, considering the interaction among the cage, races, and balls. A curve-fitted traction model, which can be used to analyze the effect of the geometry of the bearing and parameters of the lubricant, is applied. The traction that is affected by certain parameters is analyzed; then, the effect of the traction on ball bearings is investigated. The displacements of balls and contact angles are different under different surface roughness. The changes in displacements of balls and contact angles are obtained with different roughness, load, and velocities. The amplitudes of axial displacement of balls are bigger with the roughness being higher. The amplitudes of ball-inner contact angles increase with greater roughness, and the amplitudes of ball-outer race contact angles decrease with greater roughness. The simulated vibration results of ball bearings under different levels agree with the actual by the model.

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Zhang, Ke, Xianchao Wu, Xiaotian Bai, Zinan Wang, Defang Zou i Jie Sun. "Effect of the Lubrication Parameters on the Ceramic Ball Bearing Vibration in Starved Conditions". Applied Sciences 10, nr 4 (12.02.2020): 1237. http://dx.doi.org/10.3390/app10041237.

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The thickness of the oil film in ceramic ball bearings varies greatly at starved lubrication conditions, thus leading to non-uniform contact between the balls and raceways in the circumference. The lubrication parameters have a direct impact on the thickness of the oil film and then affect the dynamic characteristics of the ceramic ball bearings. A nonlinear dynamic model of ceramic ball bearing with limited lubrication is presented in this paper, and parametric studies on the effect of lubrication parameters are conducted. In starved conditions, the uneven contact between the ball and ring leads to changes in vibration, and the inner ring vibration is applied to evaluate the degree of starved lubrication. The results show that as the oil quantity increases, the bearing stiffness increases and results in increased peak frequency. As the oil quantity decreases, the thickness of the oil film reduces, resulting in the bearing vibration increase. The research findings provide a theoretical reference for ceramic ball bearing design and have guided significance for improving the service performance of ceramic ball bearings.

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Rozprawy doktorskie na temat "Ball Bearings"

El-Tayeb, Nabil Said Mohamed. "The dynamic properties of ball bearings". Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366386.

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Holland, Michael L. "Assembly Optimization for Double Row Ball Bearings". Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/37009.

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This thesis is a treatise on optimal assembly methods for double row ball bearings. As with common single row bearings, double row ball bearings, consist of four general components, namely, an inner ring, an outer ring, a complement of balls and a cage or retainer to keep the balls separate. Unlike single row bearings, however, double row ball bearings have two complements of balls in two distinct parallel races. Although this double row configuration is desirable in a number of applications, it makes the bearings more difficult and expensive to assemble. In addition, current manual assembly procedures require a great deal of digital manipulation, leading to concern about carpal tunnel syndrome and other long-term repetitive motion injuries.

This thesis attempts to develop an improved assembly process for all types of double row bearings. Although the work is intended to be general, the Torrington 5203 double row ball bearing is adopted as a specific application example. This bearing's assembly difficulties and additional cost are a result of its manual Conrad assembly method and a rubber O-ring and groove used solely for bearing assembly. In the assembly process, the O-ring supports the upper balls temporarily until the two rings can be aligned concentrically, thus snapping the balls into the bearing races. This thesis addresses the replacement of the rubber O-ring and explores opportunities for bearing assembly automation.

Design synthesis of a retractable or reusable assembly component to replace the rubber O-ring supporting the upper balls during assembly is presented. A large group of design concepts are developed and evaluated, resulting in a small group of feasible designs. These feasible solutions are then tested, and a design that has the potential immediate implementation in an improved manual assembly process is proposed. In addition, two design concepts are presented as candidates for possible implementation in an automated assembly process.
Master of Science

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Ribadeneira, M. Xavier. "Ball bearing diagnostics with multiple sensors". Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/18963.

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Levesque, George. "Critical flaw size in silicon nitride ball bearings". [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0041089.

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Shakya, Piyush. "Data fusion based diagnosis and prognosis of ball bearings". Thesis, IIT Delhi, 2015. http://eprint.iitd.ac.in:80//handle/2074/8174.

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Sandström, Tobias. "Condition Monitoring of Ceramic Ball Bearings in an Engine Testing Dynamometer". Thesis, KTH, Maskinkonstruktion (Inst.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-183126.

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The choice of the topic addressed in this thesis aims to improve the service and maintenance on ceramic ball bearings in a specific test dynamometer and through an engineering approach develop tools for condition monitoring. The company connected to this thesis, AVL, is the world's largest privately owned company for development, simulation and testing technology of powertrains for passenger cars, trucks and large engines. Engine testing is a critical part of the business at AVL Sweden and unexpected bearing failure can result in long repair times and great economic losses due to loss of the testing time. In short terms, the methodological approach followed the following steps; first a thorough information retrieval regarding bearings and analysis was conducted. The search was deepened around areas such as hybrid ball bearings, bearing failure mechanisms, bearing defect frequencies, signal analysis and condition monitoring. After this a table for bearing damage detection was developed and a “step by step” guidance for condition monitoring. The tools where afterwards verified by simple testing to detect complications within the chosen system. The existing condition monitoring system that is used today revealed weaknesses as it lacked the feature of taking preventive measures. The system that is based on temperature measurements isn’t satisfactory enough, especially when it’s missing visual clarity. Service and maintenance according to specifications from the manufacturer should be scheduled to ensure operational and guarantees. Currently mounted accelerometers on the housing of the Dynas3 engine should be connected for collecting data and the total sum of energy should be calculated for simple monitoring of historical progression. This should be done by following the guidance in order to ensure proper data acquisition. The best way to implement condition monitoring showed to be by performing multi-parameter monitoring. The design of the condition monitoring system is highly connected to what to monitor and at what stage. One main consideration to keep in mind is that it’s very rare that manufacturing defects are the reason for bearing failure. Instead it derives from improper storage, transport, handling or dimensional errors and even in some cases by improperly implemented force analysis prior to bearing selection.
Huvudämnet som behandlas i detta examensarbete syftar till att förbättra service och underhåll på keramiska kullager i en viss testdynamometer och genom ett ingenjörsmässigt tillvägagångsätt utveckla verktyg för tillståndsövervakning. Företaget som är ansluten till detta examensarbete är AVL som är världens största privatägda företag för utveckling, simulering och testteknik för drivlinor för personbilar, lastbilar och stora motorer. Motorprovning är en viktig del av verksamheten vid AVL Sverige, och ett oväntat lagerhaveri kan leda till långa reparationstider och stora ekonomiska förluster på grund av utebliven test tid. I korta termer följde den metod som använts följande steg, först genomfördes en grundlig informationssökning om lager och tillhörande analyser. Efter det fördjupades sökande kring områden som hybrida kullager, lagerskademekanismer, frekvenser kopplade till lagerskador, signalanalys och tillståndsövervakning. Efter detta framställdes en tabell för detektering av lagerskador, samt en ”steg för steg” guide för tillståndsövervakning. Verktygen för tillståndsövervakning kontrolleras efteråt, genom att enkla tester genomfördes för att upptäcka komplikationer inom det valda systemet. Det övervakningssystem som används idag avslöjade svagheter genom att sakna funktionen att vidta förebyggande åtgärder. System som är baserat på temperaturmätningar är inte tillräckligt tillfredsställande, speciellt när det saknar en visuell tydlighet. Den service och underhåll som enligt tillverkarens föreskrifter påvisas bör planeras för att säkerställa drift och garantier. Nuvarande monterade accelerometrar fästa vid motorhöljet bör anslutas för att insamla data, och den totala summan av energin bör beräknas för en enkel övervakning av det historiska utvecklingsförloppet. Detta bör göras genom att följa de riktlinjer som framställts för att säkerställa korrekt datainsamling. Det bäst passande sättet att genomföra tillståndsövervakning på i detta fall visade sig vara att utföra multiparameterövervakning. Framställningen av tillståndsövervakningssystemet är starkt förknippat med vad som skall övervakas och i vilket skede. En huvudsaklig bidragande faktor att komma ihåg är att det är mycket ovanligt att fabrikationsfel är orsaken till lagerhaveri. Istället härstammar haveriet från felaktig förvaring, transportering, hantering eller dimensioneringsfel och i vissa fall av felaktigt genomförd kraftanalys inför lagerval.

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Gunduz, Aydin. "Multi-Dimensional Stiffness Characteristics of Double Row Angular Contact Ball Bearings and Their Role in Influencing Vibration Modes". The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1326397623.

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Akturk, Nizami. "Dynamics of a rigid shaft supported by angular contact ball bearings". Thesis, Imperial College London, 1993. http://hdl.handle.net/10044/1/7359.

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Khanam, Sidra. "Vibration analysis and feature extraction of ball bearings with local defect". Thesis, IIT Delhi, 2016. http://localhost:8080/xmlui/handle/12345678/7033.

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Pinckney, Francis Douglas. "Air-oil mist lubrication of small bore ball bearings at high speeds". Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/104537.

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Książki na temat "Ball Bearings"

Society of Tribologists and Lubrication Engineers. Technical Committee on Bearings and Bearing Lubrication. Interpreting service damage in rolling type bearings: A manual on ball & roller bearing damage. Park Ridge, Ill: American Society of Tribologists and Lubrication Engineers, 1993.

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Eschmann, P. Ball and roller bearings: Theory, design, and application. Wyd. 2. München: Oldenbourg, 1985.

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Changsen, Wan. Analysis of rolling element bearings. London: Mechanical Engineering Publications, 1991.

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Albert, M. Wälzlager: Theorie und Praxis. Wien: Springer-Verlag, 1987.

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M, Barnsby Roger, i American Society of Mechanical Engineers. Tribology Division. Technical Committee., red. Life ratings for modern rolling bearings: A design guide for the application of international standard ISO 281/2. New York: ASME International, 2003.

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V, Zaretsky Erwin, i Society of Tribologists and Lubrication Engineers., red. STLE life factors for rolling bearings. Park Ridge, IL (840 Busse Hwy., Park Ridge 60068): Society of Tribologists and Lubrication Engineers, 1992.

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United States International Trade Commission. Antifriction bearings (other than tapered roller bearings) and parts thereof from the Federal Republic of Germany, France, Italy, Japan, Romania, Singapore, Sweden, Thailand, and the United Kingdom: Determinations of the Commission in investigations nos. 303-TA-19 and 20 (final) under the Tariff Act of 1930, together with the information obtained in the investigations : determinations of the Commission in investigations nos. 731-TA-391-399 (final) under the Tariff Act of 1930, together with the information obtained in the investigations. Washington, DC: U.S. International Trade Commission, 1989.

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Koshelʹ, V. M. Podshipniki kachenii͡a︡. Minsk: "Navuka i tėkhnika", 1993.

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V, Chernevskiĭ L., i Naryshkin V. N, red. Issledovanie dolgovechnosti i momentov trenii͡a︡ podshipnikov kachenii͡a︡. Moskva: Nauchno-proizvodstvennoe obʺedinenie podshipnikovoĭ promyshl., 1990.

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Części książek na temat "Ball Bearings"

Sachs, Neville W. "Ball and Roller Bearings". W Practical Plant Failure Analysis, 231–79. Second edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, 2019.: CRC Press, 2019. http://dx.doi.org/10.1201/9780429451041-10.

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Takeuchi, Yoshimi R., Sean E. Davis i Matthew A. Eby. "Steel and Hybrid Spacecraft Ball-Bearing Thermal Conductance Comparisons". W Rolling Element Bearings, 118–42. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2012. http://dx.doi.org/10.1520/stp104234.

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Takeuchi, Yoshimi R., Sean E. Davis i Matthew A. Eby. "Steel and Hybrid Spacecraft Ball-Bearing Thermal Conductance Comparisons". W Rolling Element Bearings, 1–25. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2012. http://dx.doi.org/10.1520/stp104234t.

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Leveille, Alan, Peter Frantz i Garry Rosene. "A Model to Estimate Separator Forces during Ball Speed Variations". W Rolling Element Bearings, 71–91. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2012. http://dx.doi.org/10.1520/stp104209.

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Brecher, C., i G. Gerlach. "Performance of DLC-coated Spindle Ball Bearings". W Friction, Wear and Wear Protection, 560–67. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527628513.ch72.

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Farhat, Mohamed Habib, Xavier Chiementin, Fakher Chaari, Taissir Hentati i Mohamed Haddar. "Rotor-Ball Bearings System Under Variable Regime". W Applied Condition Monitoring, 19–26. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76517-0_3.

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Henequim, Clayton, Ricardo Kondo, Eduardo de Freitas Rocha Loures i Gilberto Reynoso-Meza. "Multi-objective Fault Detection in Ball Bearings". W Proceedings of the 11th International Conference on Production Research – Americas, 430–36. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-36121-0_54.

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Vegter, R. H., T. Buslaps, Y. Kadin i H. A. Verschoor. "Measurement of Residual Stresses in Ball Bearings by Synchrotron Radiation". W Bearing Steel Technologies: 10th Volume, Advances in Steel Technologies for Rolling Bearings, 1–12. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2014. http://dx.doi.org/10.1520/stp158020140041.

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Bizarre, Letícia, Fábio Nonato de Paula i Katia L. Cavalca. "EHD Modeling of Angular Contact Ball Element Bearings". W Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 1741–51. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_143.

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Krstic, Vladislav, Dragan Milcic i Miodrag Milcic. "Experimental Investigations on Bound Frequency of Axial Ball Bearings for Fixing the Ball Screws". W Computational and Experimental Approaches in Materials Science and Engineering, 323–39. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30853-7_19.

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Streszczenia konferencji na temat "Ball Bearings"

Pandey, Ashutosh, Mingyuan Tao, Yuchuan Liu, Ran Wu, Anand Shandilya i Chengjie Wang. "Multiphase Flow in Roller/Ball Bearings". W WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2024. http://dx.doi.org/10.4271/2024-01-2437.

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<div class="section abstract"><div class="htmlview paragraph">Churning loss is an important energy loss term for rolling bearings at high-speed condition. However, it is quite challenging to accurately calculate the churning loss. A CFD study based on unsteady Reynolds-Averaged-Navier-Stokes that resolves the gas-liquid interface was performed to examine the unsteady multiphase flow in a roller/ball bearing. In this study, the rotating motion of the cage, races, rollers/balls about the shaft as well as self-rotation of rollers/balls about their own axis were accounted to accurately predict the oil distribution in various parts of the bearings. A novel meshing strategy is presented to resolve thin gaps between the roller/balls and the races/cage while preserving the shape of balls/rollers, races and cage. Five rotational speeds of the shaft have been examined for roller bearing and ball bearing respectively. Additionally, effect of clearance between roller/balls and races is investigated. Of particular interest is to examine the mechanisms governing the process of oil feed and oil splash in the bearings and their effect on the churning power loss that the bearing incurs. The oil distributions near all components of interest have also been investigated to understand the overall oil churning process. Results show that the feeding of oil from the inlet section into the bearings is strongly dependent on the oil feed rate, rotational speed of the shaft, and the bearing design itself. Results are presented to show how the rotational speed of the shaft affects the nature of multiphase flow inside the bearings and its influence on the overall oil distribution in the bearings. The computational study was validated by comparing the computed churning power loss of the roller bearing at quasi steady operation with the experimental measurements and good agreements with experiments were found. Since the study is validated, the CFD strategy presented in this study to simulate the oil churning process in the bearings can be most useful in guiding the design and development of bearings and increase the efficiency of the electrification driving systems.</div></div>

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Lin, Bo, Molong Duan, Chinedum E. Okwudire i Jason S. Wou. "An Improved Analytical Model of Friction and Ball Motion in Linear Ball Bearings With Application to Ball-to-Ball Contact Prediction". W ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88033.

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The friction behavior of rolling ball machine components like linear ball bearings is very important to their functionality. For instance, differences in linear velocity of balls induces ball-to-ball contact in certain circumstances, resulting in significant increases and variations in friction. In this paper, an improved analytical formula for determining the linear velocity of balls in four-point-contact linear ball bearings is derived as a function of contact angle deviations and contact forces. The analytical formula is validated against a comprehensive friction model in the literature and shown to be in good agreement, while an oversimplified analytical model proposed by the authors in prior work is shown to be inaccurate. A case study is presented where insights gained from the derived analytical formula are used to mitigate velocity difference of balls in a linear ball bearing which otherwise would experience ball-to-ball contact.

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Ghafari, Shahab H., Eihab M. Abdel-Rahman, Farid Golnaraghi i Fathy Ismail. "Chaos in Healthy Ball Bearings". W ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43076.

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This paper explores the effect of internal clearance on vibration characteristics of ball bearings. It is found that a fault-free bearing exhibits periodic vibration within a small range of internal clearance. However for larger values of internal clearance and large amplitude excitations, fault-free bearings exhibit chaotic behavior.

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Miner, J. R., J. Dell, A. T. Galbato i M. A. Ragen. "F117–PW–100 Hybrid Ball Bearing Ceramic Technology Insertion". W ASME 1995 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/95-gt-390.

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Results of an Advanced Research Projects Agency (ARPA) sponsored project to demonstrate the operational benefits of incorporating advanced structural ceramic ball elements into the F117–PW–100 aircraft gas turbine engine high rotor thrust bearings is described. This program consists of design, fabrication and experimental evaluation of candidate hybrid ball bearing designs in Pratt & Whitney and MRC Bearings test facilities. The bearing design criteria and development test conditions utilized for the project are compatible with the requirements of the F117–PW–100 engine system application. Two hybrid bearing designs were produced by analytically varying internal geometry features such as M–50 race curvatures and contact angles to optimize for the modulus of elasticity of the ceramic balls. One–and–one–eighth inch size CERBEC grade NBD 200 silicon nitride ceramic balls demonstrated integrity and a quadruple rolling contact fatigue life improvement versus state–of–the–art M–50 steel balls in single ball test rigs. Thermal performance data obtained in full scale bearing rig performance testing with one–hundred–seventy–eight millimeter size hybrid and all–steel baseline bearings shows comparable characteristics. The hybrid bearing displayed a distinct survivability benefit in bearing liquid lubricant starvation testing. Two dozen hybrid bearings will be fabricated for full–scale bearing rig endurance tests to be conducted in 1995–1996 as a prerequisite to validation in operating F117–PW–100 engines in 1996–1997.

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Damian, Ioan, Ion Oancea i Spiridon Cretu. "The Effect of Misalignment on Power Loss in Ball Bearings". W 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 simulation and experimental measurements emphasized the major contribution of the rings misalignment upon the bearing power loss.

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Itoigawa, F., T. Nakamura i K. Funabashi. "Bearing Vibration and Oil Film Thickness in Relation to Sphericity of Bearing Steel Balls". W ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0078.

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Abstract The relationship between the bearing vibration and the sphericity of the steel balls used for ball bearings is experimentally investigated in consideration of the oil film in between the steel balls and raceways. The experiments are carried out on angular contact ball bearings (7208C and 7010C) under only thrust load. First, it is confirmed that the oil film thickness, which is measured on this bearing, virtually agrees with the value calculated by EHL theory. And even if there exists a considerably large error in the ball shape, it does not always necessarily rupture the oil film if it is sufficiently thick. Second, in a simple two-bearing-shaft system, the even-order undulation of form error of ball, especially, second-order undulation, can cause bearing vibration. Furthermore, when the ball has a three-dimensional shape like a rugby ball, with elliptical cross-sections, the ball determines its own rotational axis.

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Kosco, John C. "P/M Bearings With Ball Bearing Like Properties". W SAE 2004 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2004. http://dx.doi.org/10.4271/2004-01-0495.

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Chikazawa, Yoshitaka, Shinichi Usui, Mamoru Konomura, Daisuke Sadahiro, Katsuhiro Tozawa, Toru Hori, Mikio Toda i Shoji Kotake. "Development of a Slim Manipulator Type Fuel Handling Machine for a Commercialized Fast Reactor". W 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89266.

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A seismic analysis has been performed showing that the seismic interaction between the UIS and the FHM can be avoided eliminating the internal clearance of bearing at the FHM arm joint. An angular contact ball bearing is suitable for the new FHM since it can eliminate gaps by preload pressure. A major problem of the FHM bearings is lubrication since the contact pressure between the steel rings and ball of the ball bearing is larger than that of the roller bearing used in the previous design. Additionally, FHM operating temperature is about 200deg-C and normal grease is not applicable under argon gas with sodium vapor to prevent contamination of grease in the primary sodium coolant. An endurance test with 1/10 scale bearings in the air has been performed to show applicability of angular contact ball bearings to the FHM arm joint. The results with 20,000cycle showed that bearings with combination of MoS2 coating steel rings and ceramics balls can be tolerable as the FHM operating condition. A full-scale bearing test in argon gas with sodium vapor has also been demonstrated to reveal bearing size and sodium vapor effects.

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Zhang, Zhiyong, Xiaoting Rui, Yushu Chen, Wenkai Dong i Lei Li. "Hysteretic Resonances and Intermittency Chaos in Ball Bearings". W ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-86411.

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Ball bearings are essential parts of mechanical systems to support the rotors or constitute the revolute joints. The time-varying compliance (VC), bearing clearance and the Hertzian contact between the rolling elements and raceways are three fundamental nonlinear factors in a ball bearing, hence the ball bearing can be considered as a nonlinear system. The hysteresis and jumps induced by the nonlinearities of rolling bearings are typical phenomena of nonlinear vibrations in the rolling bearing-rotor systems. And the corresponding hysteretic impacts have direct effects on the cleavage derivative and fatigue life of the system components. Therefore, the behaviors of hysteresis and jumps are given full attentions and continued studies in the theoretical and engineering fields. Besides, many researchers have done a lot of calculations to depict the various characteristics of bifurcations and chaos in the rolling bearings and their rotor systems, but few researches have been addressed on the inherent mechanism of the typical intermittency vibrations in rolling bearings. With the aid of the HB-AFT (the harmonic balance method and the alternating frequency/time domain technique) method and Floquet theory, this paper will investigate deeply the resonant hysteresis and intermittency chaos in ball bearings.

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Carvalho, Rafael Vischi, Katia Lucchesi Cavalca i Fabio Nonato. "Dynamic Analysis of Ball Bearings". W SAE Brasil 2009 Congress and Exhibit. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2009. http://dx.doi.org/10.4271/2009-36-0057.

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Raporty organizacyjne na temat "Ball Bearings"

Gass, Robert F. Theory, Doctrine, and Ball Bearings: Adapting Future Technology to Warfare. Fort Belvoir, VA: Defense Technical Information Center, styczeń 1996. http://dx.doi.org/10.21236/ada324294.

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Williams, J. M., i J. Miner. Performance improvement of silicon nitride ball bearings by ion implantation. CRADA final report. Office of Scientific and Technical Information (OSTI), marzec 1998. http://dx.doi.org/10.2172/597640.

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Lykins, Chris, i Lewis Rosado. Angular-Contact Ball Bearing Optimization Study. Fort Belvoir, VA: Defense Technical Information Center, wrzesień 1995. http://dx.doi.org/10.21236/ada306270.

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Tom, Kwok F. A Primer on Vibrational Ball Bearing Feature Generation for Prognostics and Diagnostics Algorithms. Fort Belvoir, VA: Defense Technical Information Center, marzec 2015. http://dx.doi.org/10.21236/ada614145.

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Bertrand, P. A. Friction at the Contact Between Bearing Balls and Cotton-Phenolic Cage Material. Fort Belvoir, VA: Defense Technical Information Center, czerwiec 2004. http://dx.doi.org/10.21236/ada423792.

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Health hazard evaluation report: HETA-91-251-2218, New Hampshire Ball Bearing, Laconia, New Hampshire. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control, National Institute for Occupational Safety and Health, maj 1992. http://dx.doi.org/10.26616/nioshheta912512218.

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Health hazard evaluation report: HETA-95-0207-2592, New Hampshire Ball Bearing, Astro Division, Laconia, New Hampshire. U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, sierpień 1996. http://dx.doi.org/10.26616/nioshheta9502072592.

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