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Dissertations / Theses on the topic 'Hydrodynamic bearing'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 June 2025

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1

Swanson, Erik Evan. "Design and Evaluation of an Automated Experimental Test Rig for Determination of the Dynamic Characteristics of Fluid-Film Bearings." Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30727.

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Hydrodynamic journal bearings are applied in a wide range of both old and new, advanced rotating machinery designs. To maintain existing machinery, as well as to design new, state of the art machines, validated analytical models for these bearings are needed. This work documents the development and evaluation of an automated test rig for the evaluation of hydrodynamic journal bearings to provide some of the needed experimental data. This work describes the test rig in detail, including the results of experimental characterization of many of the test rig subsystems. Experimental data for a t
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2

MEGGIOLARO, MARCO ANTONIO. "HYDRODYNAMIC BEARING MODELING FOR THE SIMULATION OF ROTATING SYSTEMS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1996. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=19287@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Neste trabalho a análise do comportamento de sistemas rotativos do tipo eixo-rotormancal é estendida para incluir os efeitos da presença de mancais hidrodinâmicos na resposta dinâmica. Estes efeitos estão associados à não-linearidade da força de reação exercida pelos suportes sobre o eixo e dependem dos deslocamentos, velocidades transversais e da rotação própia do rotor. A modelagem estrutural do sistema é obtida empregando-se o método dos elementos finitos. O eixo é representado pelo modelo de viga de Timoshenko com dois nós, q
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3

moles, nathaniel caleb. "Actively Controllable Hydrodynamic Journal Bearing Design Using Magnetorheological Fluids." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1444899327.

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4

Siripuram, Ravinder Babu. "ANALYSIS OF HYDRODYNAMIC EFFECTS OF MICROASPERITY SHAPES ON THRUST BEARING SURFACES." UKnowledge, 2003. http://uknowledge.uky.edu/gradschool_theses/309.

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The present thesis is a comparative study of the hydrodynamic effects of a few deterministic microasperity shapes in a thrust slider application. Numerical study based on finite difference methods is used to find the trend of important tribological properties such as friction and leakage. Also, this work utilizes a distinctive and practical approach for comparison by considering constant load conditions, instead of constant film thickness, as is expected in an operating thrust bearing. The results are encouraging and clearly reveal the existence of a transition point
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5

Guo, Zenglin. "Morton Effect Induced Instability in Mid-Span Rotorâ Hydrodynamic Bearing Systems." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/37923.

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The Morton Effect in the rotor - bearing systems may lead to an unstable operation. Up to the present, most of the established research efforts have been focused on the overhung rotor systems. In this dissertation, a systematic study on the Morton Effect induced instability in mid-span rotor systems is presented. First, the mechanism study is conducted. The simplified rotor models with isotropic linear bearing supports are adopted for the derivation of analytical expressions. The threshold speeds of instability in simple forms are obtained for the systems with the thermal imbalance acting co
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6

Mirhadizadeh, S. A. "Monitoring hydrodynamic bearings with acoustic emission and vibration analysis." Thesis, Cranfield University, 2012. http://dspace.lib.cranfield.ac.uk/handle/1826/7888.

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Acoustic emission (AE) is one of many available technologies for condition health monitoring and diagnosis of rotating machines such as bearings. In recent years there have been many developments in the use of Acoustic Emission technology (AET) and its analysis for monitoring the condition of rotating machinery whilst in operation, particularly on high speed machinery. Unlike conventional technologies such as oil analysis, motor current signature analysis (MCSA) and vibration analysis, AET has been introduced due to its increased sensitivity in detecting the earliest stages of loss of mechanic
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7

Bruckner, Robert Jack. "Simulation and Modeling of the Hydrodynamic, Thermal, and Structural Behavior of Foil Thrust Bearings." Case Western Reserve University School of Graduate Studies / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=case1089304186.

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8

Cheung, J. O. "Transient response to flexible rotor-bearing systems subjected to combined unbalance and ground excitations." Thesis, Cranfield University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233345.

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9

Gralde, Marcus, and Tómas Rúnar Sölvason. "Realisation and evaluation of a start-stop journal bearing test-rig." Thesis, KTH, Maskinkonstruktion (Inst.), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-156713.

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While there has been substantial body of work in the field of journal bearing research, much of it is today theoretical or simulated due to today’s computing power. Scania produces experimental data from motor testing, but these are expensive and time consuming. Furthermore there is a difficulty in keeping a sufficiently controlled environment, which at times makes it hard to draw conclusions from testing results. They therefore wish to develop a test-rig which can evaluate friction and wear in journal bearings. This thesis is a continuation of a project in the course Advanced Machine Design g
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10

Mertz, David Hunter. "Lift-off performance in flexure pivot pad and hybrid bearings." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3197.

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11

Kasolang, Salmiah. "An ultrasonic investigation of various aspects of Hydrodynamic lubrication in a journal bearing." Thesis, University of Sheffield, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500198.

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12

Maršálek, Ondřej. "Advanced Methods for the Solution of Journal Bearing Dynamics." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-234268.

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Náplní této disertační práce je popis komplexní a obecně použitelné strategie výpočetního modelování chování kluzných ložisek, pracujících v režimu smíšeného mazání a uvažujících reálné struktury drsných povrchů obou členů kluzných ložisek – ložiskových pánví a ložiskových čepů. V práci jsou uvedeny a detailně popsány způsoby získání charakteristických popisných dat těchto drsných povrchů a její nedílnou součástí je i popis numerických algoritmů, sloužících k následnému zpracování těchto dat. Dále jsou zde rozebrány implementované výpočetní přístupy k modelování kontaktního tlaku. Ovlivnění hy
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13

Sharma, Subhash Chandra. "Wear reducing additives for lubricants containing solid contaminants." Queensland University of Technology, 2008. http://eprints.qut.edu.au/20661/.

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Machines operating in dusty environments, such as mining and civil works, are prone to premature failure, leading to production losses. To address this problem, this research project examines the interaction between solid contaminants and the bearing micro-geometry, in lubricated surface contacts. In particular, it seeks to identify anti-wear additives that are effective in reducing wear under abrasive conditions, making machine elements more dirt tolerant. In general, the influence of antiwear additive is so small that it is difficult to isolate it. Manufactures often make claims about thei
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14

Prase, Björn. "Characteristics of hydrodynamic plain bearings with bonded coating." Technische Universität Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A21228.

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Increasing ecological and economic pressures, as well as increased technical requirements, have given rise to the need for research into alternative wear layers for hydrodynamic plain bearings. Previous investigations have tested and researched the bonded coating GL92. It has been possible to demonstrate that the bonded coating (plastic base) is a viable alternative to a conventional white metal alloy. However, this coating was not able to address all the issues experienced by industrial users, for example the behaviour of the system (changes to operating properties) during penetration of part
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15

Suzuki, Hiroyuki. "Bearing surface optimisation on hydrodynamic lubrication film with vibration-assisted machining and ultrasound reflectometry." Thesis, University of Sheffield, 2016. http://etheses.whiterose.ac.uk/12303/.

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The collapse of full-film hydrodynamic lubrication in a journal bearing often leads to a significant failure of the whole machine. In order to delay such full-film lubrication collapse, surface optimisation by implementing bespoke surface texture has spurred industrial interest. This thesis aims to optimise the journal bearing surface for an automotive transmission, addressing the deficiency of understanding of the effects of bespoke surface texture on hydrodynamic lubricant film formation under real operation by developing an accurate, inexpensive and fast texturing technique to create bespok
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16

Ebermann, Marko. "Influence of geometric form deviations on operating parameters in hydrodynamic bearings." Technische Universität Chemnitz, 2018. https://monarch.qucosa.de/id/qucosa%3A21225.

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Hydrodynamic plain bearings are important machine elements. They are used in many areas of mechanical engineering, such as turbomachines, crankshaft bearings and gears. The geometry of the lubrication gap elemen-tarily influences the function as shown in several examples of abrupt failures in turbochargers. Due to toleranc-ing, the manufacturing requirements are very high. However, the question remains how large these deviations can be. ISO 12129-2 gives recommendations on form deviations depending on the minimum of plain bear-ing clearance (hmin). Nevertheless, there is no direct reference on
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17

Cubillo, Adrian. "Physics-based approach to detect metal-metal contact in the hydrodynamic bearing of a planetary transmission." Thesis, Cranfield University, 2016. http://dspace.lib.cranfield.ac.uk/handle/1826/11585.

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Health condition monitoring, commonly referred as Integrated Vehicle Health Management (IVHM) for fleets or vehicles, studies the current and future health state of a system. Health monitoring techniques based on data driven approaches have proven successful in several areas and are easily scalable; however they do not rely on the understating of the physics of failure; whereas Physics-based Model (PbM) approaches require expert knowledge of the failure modes and are based on the understanding of the component behaviour and degradation mechanisms. The development of IVHM is particularly challe
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18

Hilton, Andrew. "Proposal for a cost-effective centrifugal rotary blood pump : design of a hybrid magnetic/hydrodynamic bearing." Thesis, University of Nottingham, 2010. http://eprints.nottingham.ac.uk/13919/.

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The growing worldwide prevalence of cardiovascular diseases (CVD) such as chronic heart failure (CHF) highlights the need for an effective treatment method. Annually, there are an estimated 17.5 million deaths caused by cardiovascular diseases worldwide, representing 30% of all global deaths; of these deaths approximately 50% are due to CHF [1] and about 80% occur in low- and middle-income countries [2]. If current trends are allowed to continue, by 2015 an estimated 20 million people annually will die from CVD [3]. Each year, only about 3,000 people receive a heart transplant as the only curr
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19

Knowles, Sean William. "An Investigation of Foil Thickness on Performance for Oil – Free Bearings." Cleveland, Ohio : Case Western Reserve University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=case1237480316.

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20

Briggs, Maxwell H. "High Pressure Performance of Foil Journal Bearings in Various Gases." Case Western Reserve University School of Graduate Studies / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=case1344447241.

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21

Vincenc, Jan. "Laboratorní simulátor pro studium radiálních kluzných ložisek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-319274.

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The master’s thesis deals with a design of a radial journal bearing simulator, which is ready to implement a transparent sapphire journal bearing to an optical observation of the oil film. The first part of this thesis contains a short review of a few currently used journal bearing test rigs. The next part of the work deals with a discussion of concept variants and a definition of important parameters. The last part contains a detailed description of the designed radial journal bearing simulator. Limitations of the designed simulator and recommendations for future improvements are also discuss
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22

Krček, Aleš. "Simulace rozběhu Lavalova rotoru uloženého v nelineárních vazbách." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443768.

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The presented diploma thesis deals with simulation of Laval rotor supported by nonlinear bearings. The first part of thesis deals with research, which is focused on description of Laval rotor and motion equations for case of rigid and flexible rotor, also on description and modeling of hydrodynamic and magnetic bearing, which is considered in thesis. The second part of thesis deals with simulation of rotor for different approaches to modeling hydrodynamic and magnetic bearings. Using simulations performer in time domain, the dynamic behavior of Laval rotor is evaluated and compared. Simulation
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23

Langer, Zdeněk. "Hnací ústrojí řadového tříválcového vznětového motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227888.

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Increasing requirements on products quality e.g. internal combustion engines, and growing demand on producing major parts lead to the giant development of the engines. With the engine development also great progress in the software tools has come. By decreasing costs on production of the prototypes and by support of the measured data the verification of the computational models is possible. This development has connection with using CAE tools like CAD systems, FEM programs and multi-body systems. The subject of this thesis is about using these systems to solve cranktrain dynamic. Also cranktra
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24

Daniel, Gregory Bregion 1984. "Analise dinamica de um sistema pino-pistão com lubrificação hidrodinamica." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263907.

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Orientador: Katia Lucchesi Cavalca<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica<br>Made available in DSpace on 2018-08-12T19:28:08Z (GMT). No. of bitstreams: 1 Daniel_GregoryBregion_M.pdf: 2663262 bytes, checksum: f7c1b338ec3a0dad168c82dc8c8d2fc2 (MD5) Previous issue date: 2008<br>Resumo: Este trabalho visa analisar o comportamento dinâmico do sistema pino pistão. Por esse motivo, foi desenvolvido um modelo matemático para o mecanismo biela-manivela, considerando a influência do mancal hidrodinâmico da junção biela-pistão. As análises dinâmi
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25

Fang, Yuefa. "Calculation and measurement of the eight oil film stiffness and damping coefficients for a variable impedance hydrodynamic bearing." Thesis, Staffordshire University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359621.

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26

Brittenden, Ashley Edward. "Critical Speeds of an HJ364 Water Jet Assembly." Thesis, University of Canterbury. Mechanical Engineering, 2012. http://hdl.handle.net/10092/7551.

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With a new range of water jet assemblies under development, CWF Hamilton & Co. Ltd. highlighted the need to establish a validated model for predicting critical speeds. A review of the relevant literature revealed a significant lack of information concerning the operating properties of a lightly loaded, water lubricated marine bearing. Therefore, an instrumented test rig based on a CWF Hamilton & Co. Ltd. ‘HJ364’ water jet assembly was established to evaluate critical speeds and validate the predictive models. A number of analytical and numerical models for predicting critical speeds were in
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27

Salomon, Johan. "New materials in sliding bearings." Thesis, KTH, Maskinkonstruktion (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-175891.

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Increasing demands for lower emissions from heavy trucks and buses creates new demands on the components in the engine. One such component is the journal bearing which is used at many positions in the engine. Implementing a start-stop system in a truck engine leads to that the crankshaft journal bearing gets worn out too quickly. A journal bearing is a sliding bearing with a constant flow of oil. When the journal starts rotating an oil film is formed between the bearing and the journal, separating the journal from the bearing surface when the rotational speed is high enough. When this happens
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28

Miranda, Gregorio do Couto. "The Detection of Journal Bearing Cavitation with Use of Ultrasound Technology." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1459969270.

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29

Snyder, Troy Alan. "On Hydrodynamic Lubrication using Perturbed Reynolds equation and CFD-FSI: Static and Dynamic Characteristics of Compliant Marine Bearings." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron157552061871739.

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30

Lábus, Jiří. "Chování kluzných ložisek řadového pětiválcového motoru při různých provozních podmínkách." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-227894.

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This diploma thesis is devoted to problems of crankshaft plain bearings at five-cylinder in-line engine. Document body describes behaviour of plain bearings under various working conditions. To needs of the hydrodynamic bearings simulations is created the cranktrain virtual model. Next part of hereof document deals with problems of bearing shell design. Is created survey of the bearing materials and shortly described technological processing of shell bearing. To understand complicated problems hydrodynamic lubrication is derived Reynolds differential equation and foreshadowed succession calcul
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31

Medeiros, Everton Coelho de [UNESP]. "Projeto e avaliação do comportamento dinâmico de um conjunto de mancais hidrodinâmicos aplicados a um rotor Jeffcott." Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/151475.

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Submitted by Everton Coelho de Medeiros null (everton.medeiros@feg.unesp.br) on 2017-08-29T19:01:48Z No. of bitstreams: 1 Dissertação_final.pdf: 4345654 bytes, checksum: 76773f0a6cc1d17c5e1162955ff8879a (MD5)<br>Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-08-29T19:06:26Z (GMT) No. of bitstreams: 1 medeiros_ec_me_guara.pdf: 4345654 bytes, checksum: 76773f0a6cc1d17c5e1162955ff8879a (MD5)<br>Made available in DSpace on 2017-08-29T19:06:26Z (GMT). No. of bitstreams: 1 medeiros_ec_me_guara.pdf: 4345654 bytes, checksum: 76773f0a6cc1d17c5e1162955ff8879a (MD5)
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32

Henry, Yann. "Analyse expérimentale de l'effet de la texturation des patins sur le comportement des butées hydrodynamiques à géométrie fixe." Thesis, Poitiers, 2013. http://www.theses.fr/2013POIT2321/document.

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La texturation de surface est une thématique récente qui suscite un certain engouement pour les contacts dynamiques. Pendant de nombreuses années, les tribologues ont privilégié les surfaces lisses aux faibles rugosités pour limiter le frottement. Inspiré des rugosités de surface organisées observées dans la nature, les topologies de surfaces sont désormais axées sur la texturation et la structuration des rugosités. Fort de ce potentiel, de nombreuses études traitent, par une approche numérique, la modélisation de ces surfaces et les études expérimentales sont rares, avec une instrumentation s
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33

Ganga, Dharan Deepak. "Numerical Analysis of End-Sealed Squeeze-Film Damper Bearings using Moving Reference Frame Formulation." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1470741953.

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34

Charitopoulos, Anastasios. "Computational Fluid Dynamics study of heavily loaded fixed-pad thrust bearings operating under thermoelastohydrodynamic regime." Thesis, Poitiers, 2020. http://www.theses.fr/2020POIT2285.

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Dans la présente thèse sont étudiés les effets des déformations thermiques sur les performances des butées à patin fixe fonctionnant sous des charges et des températures élevées. Le travail présenté se compose de deux parties principales. Dans une première étape, afin d'identifier les mécanismes de génération de pression dans les butées à surfaces parallèles, les différentes théories proposées dans la littérature scientifique ont été évaluées. À cette fin, un modèle thermoélastohydrodynamique (TEHD) basé sur la Dynamique de Fluides Numérique (CFD) a été généré, en tenant compte tous les phénom
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35

Denis, Sébastien. "Analyse dynamique d'une ligne d'arbre verticale supportée par une butée à patins oscillants." Thesis, Poitiers, 2014. http://www.theses.fr/2014POIT2335/document.

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Les problèmes vibratoires sont l'une des principales causes des maintenances effectuées sur les turbines de barrages hydroélectrique en France. Dans cette thèse CIFRE, subventionnée par la Division Technique Générale d’Électricité de France à Grenoble, nous voulons étudier numériquement les phénomènes physiques en jeu.Pour cela, chaque partie composant ce type de machine tournante est modélisée : la ligne d'arbre, les accouplements rigides, les paliers hydrodynamiques, la butée hydrodynamique à patins oscillants, les étanchéités et les efforts électromagnétiques. Celui du rotor est basé sur un
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36

Maršálek, Ondřej. "Návrh ojnice vznětového leteckého motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229990.

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The thesis deals with complex connecting rod design of two stroke diesel engine with regard to minimising its weight. Three versions of design are suggested and for each of them the stress analyses are implemented and the fatigue safety factors are determined. On the basis of results of implemented analyses and evaluation of all the aspects the most appropriate design is chosen and the production drawing is drawn according to it. In the conclusion, hydrodynamic lubrication plain bearings, which are the integral part of every connecting rod, are designed.
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37

Hruška, Miroslav. "Hydrodynamická ložiska šestiválcového vznětového motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229930.

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This master’s thesis focuses on hydrodynamic plain bearing drivetrain in-line sixcylinder diesel tractor engine. In the first part is used as reported in contemporary bearing materials and design solutions bearing basins. Furthermore, given the general Reynolds equation of hydrodynamic lubrication. The main part of the thesis is devoted to creating a virtual model of the crank mechanism in MBS system ADAMS/Engine. Rigid crankshaft in this model is replaced by the flexible crankshaft, which is prepared in the FEM software ANSYS and then exported. The final section presents the results of simula
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38

Salles, Bruno Barbosa de Oliveira Ferreira. "Otimização da superfície de deslizamento em mancais hidrodinâmicos radiais com carregamento estático." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/263511.

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Orientador: Marco Lúcio Bittencourt<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecânica<br>Made available in DSpace on 2018-08-18T00:20:19Z (GMT). No. of bitstreams: 1 Salles_BrunoBarbosadeOliveiraFerreira_M.pdf: 1743784 bytes, checksum: 438a0b9981dbede83c23bbafd7f95964 (MD5) Previous issue date: 2011<br>Resumo: Este trabalho tem por objetivo desenvolver um algoritmo computacional para otimização de forma da superfície de mancais hidrodinâmicos. O algoritmo usa a teoria de lubrificação elastohidrodinâmica que leva em conta a deformação elástica do
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39

Fowell, Mark Thomas. "Hydrodynamic Modelling of Textured Bearings." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519607.

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40

Kunik, Serguei. "Étude numérique et expérimentale du mécanisme de lubrification eX-Poro-HydroDynamique (XPHD)." Thesis, Poitiers, 2018. http://www.theses.fr/2018POIT2264/document.

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La lubrification eX-Poro-HydroDynamique (XPHD) est un mécanisme de lubrification d’inspiration biomimétique. Il s’agit principalement d’un écoulement dans un milieu poreux, dont la phase solide représentée par des fibres, induit des forces élastiques de compression considérées comme négligeables par rapport aux forces hydrodynamiques générées à l’intérieur du milieu poreux. L’idée essentielle de la lubrification XPHD consiste en remplacement du matériau antifriction et du film de fluide mince, traditionnellement utilisé dans les solutions classiques, par une couche poreuse imbibée d’un fluide
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41

Pokorný, Jan. "Výpočtové modelování radiálních hydrodynamických ložisek pro vodní stroje." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382572.

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The aim of this thesis is to calculate the stiffness and damping coefficients for radial hydrodynamic bearings. Cylindrical and lemon hydrodynamic bearings are considered. The solution to this problem mainly depends on the hydrodynamic pressure in the bearing. The numerical solution of the Reynolds equation is used to calculate the pressure. The effect of variable viscosity and density of the lubricant due to temperature changes is considered. The static equilibrium position of the journal centre is also solved. The stiffness and damping coefficients are determined using small amplitude journa
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42

Giraudeau, Célia. "Influence des discontinuités géométriques sur les performances des paliers en régime thermoélastohydrodynamique (TEHD)." Thesis, Poitiers, 2016. http://www.theses.fr/2016POIT2298/document.

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Lors de diverses opérations de maintenance, des dégradations au niveau des rotors et des organes de supportage du groupe turbo-alternateur ont pu être constatées. Celles-ci se traduisent souvent par la présence de rayures au niveau des paliers hydrodynamiques, synonymes de fortes discontinuités dans le film d'huile. C'est dans ce contexte que s'inscrivent ces travaux de thèse. L'objectif est d'avoir une meilleure compréhension et prédiction de leur impact sur le fonctionnement du palier. Pour cela, les paliers à géométrie fixe sont étudiés théoriquement et expérimentalement. L'étude théorique
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43

Fitzgerald, Michael Kevin. "Heat transfer effects in hydrodynamic journal bearings." Thesis, University of Sheffield, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.722175.

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44

Kern, Colin. "Betriebsverhalten von thermisch und mechanisch hoch beanspruchten kunststoffbeschichteten Radial-Mehrflächengleitlagern." Doctoral thesis, Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-71977.

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Die vorliegende Arbeit verfolgte die Zielstellung der Substitution des etablierten Weißmetalls als Laufschicht von hydrodynamischen Mehrflächengleitlagern durch neuartige Kunststoffschichten. Dazu wurden vergleichende Bauteilversuche an Mehrflächengleitlagern mit verschiedenen Laufschichten und Bohrungsformen vorgenommen. Eine Zinnbasislegierung als Laufflächenbeschichtung diente dabei als Referenzwerkstoff. Zur Durchführung des Versuchsprogrammes kam ein vorhandener, messtechnisch neu konditionierter Turbinenlagerprüfstand zum Einsatz. Die Versuchsreihen haben durchweg positive Beurteilungen
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45

Garcia, Mathieu. "Refrigerant-lubricated gas foil bearings : A thermo-hydrodynamic study (application to rigid bearings)." Thesis, Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0133/document.

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Des études internes à Liebherr-Aerospace France, concernant la conception de nouveaux compresseurs lubrifiés par gaz réfrigérant, ont montré que dans des conditions de fonctionnement spécifiques, un mélange de vapeur et de liquide apparaît au sein du compresseur, au lieu d'une phase vapeur seule. De ce fait, le comportement des paliers à feuilles lubrifiés au gaz réfrigérant est étudié, y compris la possibilité d'un écoulement diphasique du lubrifiant. L'étude porte sur le comportement du lubrifiant uniquement, dans des conditions de fonctionnement qui sont celles des paliers à feuilles. L'app
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46

Glavatskikh, Sergei B. "On the hydrodynamic lubrication in tilting pad thrust bearings /." Luleå, 2000. http://epubl.luth.se/1402-1544/2000/34/index.html.

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47

Jintanawan, Thitima. "Vibration of rotating disk-spindle systems with hydrodynamic bearings /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/7149.

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48

Dakel, Zaki. "Stabilité et dynamique non linéaire de rotors embarqués." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0087/document.

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Les rotors sont excités non seulement par le balourd tournant mais aussi par les différents mouvements de leur support : turbocompresseurs de véhicules, turbomoteurs aéronautiques, pompes à vide portées en sont des exemples industriels. Ainsi la conception de rotors robustes capables de bien fonctionner sous de telles conditions (excitations extrêmes) est nécessaire pour éviter des instabilités, source de défaillance catastrophique. Le présent travail a pour objectif de prévoir le comportement dynamique d’un rotor embarqué monté sur des paliers rigides ou élastiques hydrodynamiques et soumis à
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49

Lavie, Thomas. "Optimisation de la lubrification des paliers de tête de bielle : démarche méthodologique." Thesis, Poitiers, 2012. http://www.theses.fr/2012POIT2298/document.

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Le but de ce travail est de proposer une démarche structurée pour l'étude des liaisons lubrifiées bielle/vilebrequin. Bien que cette source de déperdition énergétique ne soit pas primordiale, il n'en est pas moins vrai que la maîtriser est un enjeu pour les motoristes. Les normes anti-pollution imposées aux constructeurs automobiles étant de plus en plus strictes, un effort doit être réalisé sur l’ensemble des composants afin de réduire de façon significative les pertes d’énergie dans les moteurs. La tendanceactuelle est à la diminution de la viscosité du lubrifiant, toutefois ce n'est pas san
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50

Jakeman, R. W. "Analysis of dynamically loaded hydrodynamic journal bearings with particular reference to misaligned marine sterntube bearings." Thesis, Nottingham Trent University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233019.

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