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Dissertations / Theses on the topic 'Ball Bearings'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

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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2

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 assemb

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3

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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4

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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5

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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6

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 t

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7

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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8

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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9

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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10

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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11

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

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12

Tuomas, Roger. "Properties of oil and refrigerant mixtures : lubrication of ball bearings in refrigeration compressors /." Luleå : Division of Machine Elements, Luleå University of Technology, 2006. http://epubl.ltu.se/1402-1544/2006/70/.

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13

Sum, Wei Wern. "Dynamic analysis of angular-contact ball bearings and the influence of cage geometry." Thesis, University of Nottingham, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423977.

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14

Yin, Zidong. "Modeling and design of a miniature high precision linear stage on ball bearings." Compiègne, 2010. http://www.theses.fr/2010COMP1914.

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Aujourd'hui, la miniaturisation est une tendance forte dans le développement technologique des produits industriels, avec les exigences en composants microtechniques. Le micro / usinage conventionnel à l'outil est de plus en plus important, car il peut créer des pièces en 3-D avec des matériaux divers et il présente de nombreux avantages en efficacité, productivité, flexibilité et rentabilité, etc. Us guidages linéaires miniatures sont des composants clés des méso machines-outils. Cette thèse porte sur la conception d'une table linéaire miniature sur roulements à billes avec une raideur élévée

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15

Karlsson, Alexander, and Eric Marcus. "Evaluation of Strain and Temperature Measurements with Fiber Bragg Grating for Loss Verification and Heat Transfer of Ball Bearings." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86149.

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Volvo Cars is in a change of producing only electric and hybrid cars by 2025.Subcomponent testing is a crucial part to ensure the quality of the individual buildingblocks in an electric machine. Any way of making these tests more reliable and less timeconsuming is of great interest at Volvo. Force and temperature on bearings are especiallyhard to measure accurately, because of their placement and dynamic behavior. Accurateand reliable measurements is also a vital part in creating realistic Computer-AidedEngineering (CAE) models for simulation purposes. Simulations on bearings could lead tobett

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16

Huq, Fazul, and dpmeng@bigpond com. "Development of Life Prediction Models for Rolling Contact Wear in Ceramic and Steel Ball Bearings." RMIT University. Aerospace, Mechanical and Manufacturing Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080215.145624.

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The potential for significant performance increases, using ceramic materials in un-lubricated rolling element bearing applications, has been the subject of research over the past two decades. Practical advantages over steel include increased ability to withstand high loads, severe environments and high speeds. However, widespread acceptance has been limited by the inability to predict wear life for ceramic bearing applications. In this thesis, the rolling contact wear of 52100 bearing steel and Over-aged Magnesia-Partially-Stabilised Zirconia (OA-Mg-PSZ) ceramic are examined using a n

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17

Chen, Qi. "Benchmarking of temperature and friction in axial ball bearings lubricated by a novel polymer thickened grease." Thesis, KTH, Maskinkonstruktion (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-183007.

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This project concerns the benchmarking of a novel polymer thickened grease with a lithium thickened one. The new grease has shown low temperature property in the previous bearing tests on SKF-R2F. A DAQ interface was implemented using lab View for a modified four-ball machine. The result shows the temperature and friction torque profiles of the greases at different speeds. The raw data is attached with a suggested improvement for friction measurement.<br>Det här projektet avser att jämföra ett nytt polymerbaserat fett med ett lithiumbaserat fett. Det nya fettet har påvisat låga temperaturegens

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18

Kirchner, William Thomas. "Ultrasonic acoustic health monitoring of ball bearings using neural network pattern classification of power spectral density." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/36130.

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This thesis presents a generic passive non-contact based acoustic health monitoring approach using ultrasonic acoustic emissions (UAE) to facilitate classification of bearing health via neural networks. This generic approach is applied to classifying the operating condition of conventional ball bearings. The acoustic emission signals used in this study are in the ultrasonic range (20-120 kHz), which is significantly higher than the majority of the research in this area thus far. A direct benefit of working in this frequency range is the inherent directionality of the microphones capable of me

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19

Perrelli, Valeria. "Six Sigma Approach to Halve the Cycle Time of a Grinding Process on Carbonitrided Parts : Case analysis and solution executed at SKF-Bari Factory, Italy." Thesis, KTH, Industriell produktion, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102794.

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The main purpose of this thesis work was to halve the cycle time of a grinding process of the groove of carbonitrided ball bearings rings. The study was conducted as a Six Sigma project at SKF in Bari, Italy. Reaching the goal was important for the company as it meant avoiding the purchase of another grinding machine. The groove grinding process on carbonitrided rings features double the cycle time than the same process on through hardened rings and halving it was required to fulfill the volumes demanded. The Six Sigma methodology was applied through the implementation of DMAIC. The analysis o

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20

Kucukyilmaz, Ali. "Experimental Investigation Of Residual Stresses Introduced Via Shot Peening And Their Effect On Fatigue Life Of Ball Bearings." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12611494/index.pdf.

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In this study, residual stresses introduced via application of shot peening on the raceways of bearing rings and their effect on the fatigue life was investigated experimentally. For improvement of residual compressive stress state, shot peening operation with different parameters was utilized. Residual stress measurements were conducted via X-ray diffraction technique. Optimization of residual stress state during the production of ball bearings is the main target of this study. Process parameters for shot peening and super-finishing were studied for determination of the parameters that induce

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21

Bainbridge, Emma. "'Ball-bearings all the way, and never a dull moment!' : an analysis of the writing of G.V. Desani." Thesis, University of Kent, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399648.

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22

CABRAL, Adriano de Sousa. "Estudo termográfico de auxílio à detecção de falhas por desgaste mecânico em rolamento autocompensador de esferas." Universidade Federal de Campina Grande, 2017. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1497.

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Submitted by Maria Medeiros (maria.dilva1@ufcg.edu.br) on 2018-08-20T12:32:16Z No. of bitstreams: 1 ADRIANO DE SOUSA CABRAL - DISSERTAÇÃO (PPGEM) 2017.pdf: 4297640 bytes, checksum: 947cc1f3c800182da45417aaab2b3861 (MD5)<br>Made available in DSpace on 2018-08-20T12:32:16Z (GMT). No. of bitstreams: 1 ADRIANO DE SOUSA CABRAL - DISSERTAÇÃO (PPGEM) 2017.pdf: 4297640 bytes, checksum: 947cc1f3c800182da45417aaab2b3861 (MD5) Previous issue date: 2017-07-26<br>O objetivo desta pesquisa foi analisar se a Termografia pode auxiliar na detecção de falhas em elementos de máquinas, notadamente rolamentos au

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23

Masotti, Paulo Henrique Ferraz. ""Metodologia de monitoração e diagnóstico automatizado de rolamentos utilizando lógica paraconsistente, transformada de wavelet e processamento de sinais digitais"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/85/85133/tde-28052007-165556/.

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A área de monitoração e diagnóstico vem apresentando um acentuado desenvolvimento nos últimos anos com a introdução de novas técnicas de diagnóstico bem como vem contando com a contribuição dos computadores no processamento das informações e das técnicas de diagnósticos. A contribuição da inteligência artificial na automatização do diagnóstico de defeito vem se desenvolvendo continuamente e a crescente automação na indústria vêm de encontro a estas novas técnicas. Na área nuclear, é crescente a preocupação com a segurança nas instalações, e têm sido procuradas técnicas mais eficazes para aumen

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24

Nelias, Daniel. "Contribution à l'étude des roulements." [S.l.] : [s.n.], 1999. http://csidoc.insa-lyon.fr/these/1999/nelias/index.html.

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25

Knauf, Stefan [Verfasser], and Rolf [Akademischer Betreuer] Rannacher. "Numerical simulations for ball bearings considering fluid-structure interaction problems and non-Newtonian fluids with a free boundary / Stefan Knauf ; Betreuer: Rolf Rannacher." Heidelberg : Universitätsbibliothek Heidelberg, 2011. http://d-nb.info/1179229290/34.

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26

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

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Dans un système de machines rotatives comme un moteur à turbine, les paliers d'éléments roulants à grande vitesse jouent un rôle important dans le support de l'arbre ou du rotor rotatif, et ont besoin d'une lubrification pour assurer leur fonction. Sauf qu'une petite quantité d'huile est nécessaire pour former le film lubrifiant élastohydrodynamique dans la zone de contact, la plus grande partie du lubrifiant reste en suspension dans l'air, formant un mélange huile/air. Ce phénomène entraîne des pertes hydrauliques parasitaires excessives lorsque les éléments roulants se translatent et tournen

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27

Carvalho, Rafael Vischi. "Análise dinâmica de rolamentos de esfera." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263050.

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Orientador: Katia Lucchesi Cavalca Dedini<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-16T18:19:16Z (GMT). No. of bitstreams: 1 Carvalho_RafaelVischi_M.pdf: 7127919 bytes, checksum: 2c7a6895f35098e4e4f46ed38b158980 (MD5) Previous issue date: 2010<br>Resumo: Rolamentos de esfera são elementos de máquinas de forma simples mas utilizados em aplicações envolvendo altas velocidades, altas temperaturas e diferentes carregamentos. O modelo para o carregamento é fundamental para análise dinâmica do mancal e por

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28

Radaelli, Gustavo Zarpelon 1989. "Determinação do carregamento dinâmico em mancais de esfera de contato angular." [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264178.

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Orientador: Kátia Lucchesi Cavalca Dedini<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica<br>Made available in DSpace on 2018-08-22T11:25:08Z (GMT). No. of bitstreams: 1 Radaelli_GustavoZarpelon_M.pdf: 6785468 bytes, checksum: 07019edf34b966c552330056d686bd33 (MD5) Previous issue date: 2013<br>Resumo: Os mancais possuem um papel expressivo dentre os componentes de um sistema rotativo, tendo o suporte de um elemento rotativo como sua principal função. Por trabalharem na interface entre elementos fixos e rotativos, os mancais constituem a origem

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29

Ivan, Knežević. "Analiza dinamičkog ponašanja kugličnih ležaja primenom veštačkih neuronskih mreža." Phd thesis, Univerzitet u Novom Sadu, Fakultet tehničkih nauka u Novom Sadu, 2020. https://www.cris.uns.ac.rs/record.jsf?recordId=114949&source=NDLTD&language=en.

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Predmet ove doktorske disertacije je analiza dinamičkog ponašanjakotrljajnih ležaja primenom veštačkih neuronskih mreža. Na bazirezultata eksperimentalnog ispitivanja obučene su veštačkeneuronske mreže koje su sposobne da predvide amplitude brzinevibracija ležaja. Vibracije koje ležaj generiše zavise od nizauticajnih parametara koji se mogu podeliti na konstrukcione,tehnološke i eksploatacione. Modeli dobijeni primenom veštačkihneuronskih mreža određuju zavisnosti između uticajnih parametara iamplituda brzine vibracija koje ležaj generiše. Validacijaneuronskih modela izvršena je na osnovu eksp

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30

Hjalmarsson, Joel, and Anes Memic. "FE Analysis of axial-bearing in large fans : FE analys av axialkullager i stora fläktar." Thesis, Linnaeus University, School of Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-6663.

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<p>Detta examensarbete har utförts på Fläktwoods AB i Växjö, som producerar stora axialfläktar för olika industriapplikationer. Syftet är att öka kunskapen om fettsmorda axiella kullager genom FE analyser.</p><p>Projektet har genomförts i fem delsteg för att avgöra påverkan av en eller några få parametrar i taget. De studerade parametrarna är: elementstorlek, kontaktstyvhet, last, lagergeometri (dvs. oskulation), ickelinjär geometri och ickelinjära materialegenskaper (dvs. plasticitet).</p><p>Slutsatsen är att elementstorleken bör väljas fint nog för att ge ett jämnt resultat men grovt nog för

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31

Niel, Dimitri. "Etude du comportement thermomécanique de paliers à roulements pour une application hautes vitesses." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI007/document.

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Avec l’apparition de moteur électrique dans le secteur automobile, les réducteurs mécaniques fonctionnent à des vitesses de rotation de plus en plus élevées. Pour ce type de réducteur, les pertes de puissance au niveau des paliers à roulements peuvent être prédominantes pour des vitesses de rotation élevées. Ces pertes sont fortement dépendantes du comportement thermique du palier à roulement. D’où l’intérêt de développer des outils numériques permettant d’estimer les puissances générées au sein d’un palier à roulement. Cette estimation permettra en phase de pré-étude de développer un disposit

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32

Alegranzi, Selvino Bork. "Construção e adequação de uma bancada de ensaios para investigações de técnicas não destrutivas de detecção de falhas incipientes em rolamentos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2012. http://hdl.handle.net/10183/60683.

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O monitoramento de vibração de máquinas rotativas é de grande interesse da indústria, uma vez que se tem a possibilidade de detectar, com certa antecedência, problemas relacionados à condição de funcionamento do equipamento, possibilitando reparos, ajustes ou consertos e, assim, minimizando custos no caso de falhas graves ou paradas inesperadas. Neste trabalho é feita a adequação de uma bancada de testes para estudo de técnicas de detecção de falhas em rolamentos de esferas por análise de vibração. O objetivo é o de localizar falhas em rolamentos utilizando o monitoramento dos sinais das vibra

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33

Xin, Ge. "Sparse representations in vibration-based rolling element bearing diagnostics." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI051/document.

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Bien que le diagnostic des roulements par analyse vibratoire soit un domaine très développé, la recherche sur les représentations parcimonieuses des signaux de vibration est encore nouvelle et difficile pour le diagnostic des machines tournantes. Dans cette thèse, de méthodes nouvelles ont été développées, au moyen de différents modèles stochastiques, associées à des algorithmes efficaces afin de servir l’industrie dans le diagnostic des roulements. Tout d’abord, les modèles parcimonieux présentés dans la littérature sont revus. Les principales publications concernant le diagnostic des machine

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34

Bezerra, Roberto de Araujo. "Detecção de falhas em rolamentos por analise de vibração." [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/265232.

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Orientador: Robson Pederiva<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-04T03:26:01Z (GMT). No. of bitstreams: 1 Bezerra_RobertodeAraujo_D.pdf: 3842898 bytes, checksum: 23a6bdd65c87be47fe4cfa856795bab0 (MD5) Previous issue date: 2004<br>Resumo: Neste trabalho, é feito um estudo comparativo entre diversas técnicas de detecção de falhas em rolamentos por análise de vibração. Inicialmente, as técnicas foram aplicadas a modelos matemáticos de falhas nas pistas interna, externa e nas esferas dos rolamentos; sendo

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35

Rommelaere, Simon. "Ball Bearing Design Tool Evaluation." Thesis, KTH, Rymdteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-219425.

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This report has been written during my internship/master thesis at Thales Alenia Space, Cannes, FRANCE. The subject of the thesis is ball bearing design, and is focused on the software RBSDyn. This software has been developed by CNES, the French Center for Space Studies, and is used to simulate bearings behaviors under various conditions. My mission was to verify, test and implement this software for the company. In order to do so, the first step was to understand the bearing theory, which is the first part of this report. The second step was to use the software and verify its results, which i

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Rullich, Markus [Verfasser], Thomas [Akademischer Betreuer] Frauenheim, and Ciacchi Lucio [Akademischer Betreuer] Colombi. "Experimental and Computational Investigation of the Influence of a Plasma-Enhanced Chemical Vapor Deposition Amorphous Carbon Fluorine Coating on Sliding Friction in Hybrid Ball Bearings / Markus Rullich. Gutachter: Thomas Frauenheim ; Lucio Colombi Ciacchi. Betreuer: Thomas Frauenheim." Bremen : Staats- und Universitätsbibliothek Bremen, 2012. http://d-nb.info/107204658X/34.

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37

Amami, Lassad. "Analyse expérimentale de la réponse dynamique d'un rotor vertical guidée par desroulements avec jeu." Thesis, Poitiers, 2016. http://www.theses.fr/2016POIT2254.

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L'objectif de cette thèse est l’étude expérimentale d’un rotor vertical, complexe supporté par deux paliers à roulements et deux paliers aérostatiques. Le fort comportement non-linéaire du rotor est dû aux jeux fonctionnels existants entre les bagues extérieures des roulements et les pièces du carter en vis-à-vis.Les paliers aérostatiques sont destinés à simuler la présence des joints d’étanchéité annulaires et d’apporter de l’amortissement au rotor.Le boitier d’essai est composé d'un rotor représentatif en termes de dimensions, de masse et de répartitions des inerties d’une machine réelle. Il

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Hergert, Robert J. "Rotary micro-ball bearing designs for MEMS applications." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/40060.

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Micro-electro-mechanical systems (MEMS) technology allows the fabrication of small mechanical systems in silicon using standard micro-fabrication pro- cesses. MEMS techniques have found wide acceptance in such devices as ac- celerometers, micro-mirrors, resonators, probes, and micro-tweezers to name a few. Though small linear motions are common in MEMS applications, few devices exhibit reliable rotary motion. This work explores several methods of fabricating rotary bearings using micro-balls as the support mechanism. Micro-ball bearings have several advantages over other MEMS bearing tech- nol

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Adolfsson, Erik. "Simplified finite element bearing modeling : with NX Nastran." Thesis, Uppsala universitet, Tillämpad mekanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-255398.

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This report was produced at the request of ABB Robotics and the work was conducted at their facilities in Västerås, Sweden. In the development of industrial robots the structures are slimmed to increase the accuracy and speed. When conducting finite element analysis on the robots the accuracy of the component modelling and definitions of the boundary conditions becomes more important. One such component is the ball bearing which consist of several parts and has a nonlinear behavior where the balls are in contact with the rings. The task given was to develop new methods to model roller bearings

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40

Omar, Farah Samatar. "Modélisation multiphysique des roulements à billes par la Méthode des Éléments Discrets en régime Élasto-Hydro-Dynamique." Electronic Thesis or Diss., Amiens, 2022. http://www.theses.fr/2022AMIE0059.

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Le travail réalisé dans le cadre de cette thèse a contribué au développement d'un outil numérique dédié à la simulation des roulements à billes en conditions de service Elasto-Hydro-Dynamiques (EHD). Une modélisation originale, adaptée à ces organes de guidage en rotation, est donc mise en œuvre dans le cas des roulements à billes à contact radial SKF 6208 et à contact oblique SKF 7208. De par leur caractère multi-contact, les deux roulements sont modélisés par la Méthode des Eléments Discrets, avec une formulation hertzienne du contact elliptique pour déterminer les interactions billes/pistes

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41

Westsson, David. "Simulation of torque caused by the lubrication fluid in a ball bearing." Thesis, Umeå universitet, Institutionen för matematik och matematisk statistik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-126563.

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Mutyala, Kalyan Chakravarthi. "Influence of Metallic, Dichalcogenide, and Nanocomposite Tribological Thin Films on The Rolling Contact Performance of Spherical Rolling Elements." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1447751680.

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Bovet, Christophe. "Contribution à la modélisation du comportement dynamique des paliers à roulements de réducteurs aéronautiques." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4022.

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La quête de minimisation du ratio poids-puissance, omniprésente dans l'industrie aéronautique, conduit à une plus grande souplesse structurelle des boîtes de transmission de puissance d'hélicoptères.Cette souplesse structurelle, associée aux sollicitations sévères mises en jeu, entraîne des déformations non négligeables des arbres et carters, et nuit naturellement à la tenue en service des roulements.S'il n’est pas maîtrisé, le désalignement des portées de roulements accroît fortement les efforts vus par la cage et peut conduire à sa rupture en fatigue.Le travail proposé s'intéresse à la modél

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Hirst, Derek John. "Failure of the elastohydrodynamic lubrication of ball bearing components at very high speeds." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.676730.

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Zhang, Qingning. "Experimental and analytical investigation into the two stage turbocharging systems for diesel engines." Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.707566.

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The work described in this thesis aims to conduct a systematic study of the two stage turbocharging system to improve the Diesel engine transient performance as well as NOX and CO2 emissions with a focus on the improved turbocharger matching and the control of the charging system, through the use of high fidelity engine models backed by experimental results. To perform the analytical study, commercial 1D simulation software has been used in the process of system characterisation and control strategy design. To validate the analytical results, a two stage turbocharging system was installed on a

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Dyson, John Edwin. "Aspects of the behaviour and design of dental high speed ball bearing air turbine handpieces." Thesis, University of London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324587.

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Endicott, Roger A. "Immunoregulation of T-lymphocyte proliferative activity by alveolar macrophages from mice bearing Lewis lung carcinoma tumors." Virtual Press, 1986. http://liblink.bsu.edu/uhtbin/catkey/458971.

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The immune regulatory abilities of alveolar macrophages from C57B1/6 mice bearing a metastatic variant of Lewis lung carcinoma were determined. During early stages of tumor development, or before tumors metastasized to the lungs, alveolar macrophages did not affect or slightly enhanced T-lymphocyte proliferation; as tumor growth progressed, or following tumor metastasis, alveolar macrophages suppressed the T-cell response. Macrophage suppressor activity was probably not mediated by their production of PGE, since macrophages of tumor-bearing mice secreted less 2 PGE than did macrophages of norm

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Liao, Xin-Wei, and 廖信瑋. "Radial passive magnetic bearing in ball bearings supporting rotor system applications." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/yvcpxc.

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碩士<br>中原大學<br>機械工程研究所<br>102<br>Nowadays, magnetic systems have been applied in the industry systems widely due to the frictionless property of magnetic systems. Magnetic systems have two kinds: passive and active magnetic systems. Active magnetic systems use electronic magnet to control the subjects, such as rotors or platforms, by controlling the current to adjust the size of magnetic force. The advantage is the system stability can be confirm via tuning the magnetic force by the feedback signals, but the disadvantage is the magnetic system need additional control system and will consume the

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Chih-Ming, Lin, and 林志明. "Analysis for the Stiffness of Ball Bearings." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/39170709352485704249.

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碩士<br>中原大學<br>機械工程研究所<br>90<br>SKF deep groove bearing and angular contact bearing are analyzedfor displacement and stiffness coefficient. According to Hertz contact theory, Jones-Harris build the method for analyzing the displacement and stiffness coefficient of bearings under load. This investigation programs Jones-Harris Method (JHM) in Borland C++ to do trial and error repeatedly and accurately. Results from Finite Element Method (FEM) which fits the reality almost are compared to JHM and Palmgren’s empirical function. Palmgren’s method over evaluates the stiffness due to reduced assumptio

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Liu, Zhen-Gang, and 劉鎮綱. "Contact Stress Analysis of Hybrid Ceramic Ball Bearings." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/12293815737286854706.

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碩士<br>國立聯合大學<br>機械工程學系碩士班<br>101<br>The hybrid ceramic ball bearing has low density, high hardness, low friction coefficient, non-magnetic, high wear resistance, good self-lubricating and rigidity characteristics, especially suitable for high speed, high precision and long life of the rolling elements. This study focuses on contact stress analysis of the hybrid ceramic ball bearing with inner and outer ring for various bearing materials. The segmented regression equations are derived by bearing parameters regression analysis. It can provide more convenient computing and applications for bearin

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