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Dissertations / Theses on the topic 'Lubricating textured'

Author: Grafiati
Published: 6 September 2023

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1

Tertuliano, Iramar da Silva. "Textura superficial: efeito sobre o desempenho de óleos aditivados e não aditivados em ensaios alternados." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-10082017-164633/.

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Neste trabalho foram conduzidos experimentos de laboratório no intuito de avaliar o efeito da textura superficial no desempenho de óleos lubrificantes aditivados e não aditivados. Os materiais envolvidos nos ensaios são referentes a materiais de anel e camisa de motores de combustão interna e as condições de superfície envolveram processamentos de lixamento e retífica, bem como texturização de microcavidades a laser. Os ensaios foram do tipo alternado, com regime limítrofe de lubrificação. Inicialmente foram feitas análises sobre a metodologia utilizada para o cálculo do coeficiente de atrito
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2

Venkatesan, Sriram. "SURFACE TEXTURES FOR ENHANCED LUBRICATION: FABRICATION AND CHARACTERIZATION TECHNIQUES." Lexington, Ky. : [University of Kentucky Libraries], 2005. http://lib.uky.edu/ETD/ukymeen2005t00274/Venkatesan%5FThesis.pdf.

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Thesis (M.S.)--University of Kentucky, 2005.<br>Title from document title page (viewed on November 9, 2005). Document formatted into pages; contains viii, 85 p. : ill. Includes abstract and vita. Includes bibliographical references (p. 83-84).
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3

Duvvuru, Ravi Shankar. "Novel self-adapting microscale surface textures for hydrodynamic lubrication." Auburn, Ala., 2007. http://repo.lib.auburn.edu/07M%20Theses/DUVVURU_RAVI_3.pdf.

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4

Ali, Fadi. "Effect of Surface Texturing on Friction and Film Thickness under Starved Lubrication Conditions." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-234247.

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Tato disertační práce se zabývá vlivem mělkých mikro-textur na tření a tloušťku filmu v mazaných nekonformních kontaktech za extrémních podmínek a za podmínek hladovění kontaktu. Měření byla realizována na tribometru v konfiguraci ball-on-disk. Kontakt byl pozorován pomocí vysokorychlostní kamery. Pro stanovení součinitele tření byl využit snímač krouticího momentu. V této studii byly popsány dva typy mikrotextur – mikrovtisky a příčné mikrodrážky. Výsledky naznačují, že za podmínek hladovění vedou mikrovtisky ke snížení tření a to díky nárůstu tloušťky mazacího filmu. Mechanismus doplňování m
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5

Li, Wei. "EXPERIMENTAL BENCHMARKING OF SURFACE TEXTURED LIP SEAL MODELS." UKnowledge, 2012. http://uknowledge.uky.edu/me_etds/14.

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A thorough investigation on the existing hydrodynamic lubrication theories and the reverse pumping theories for the conventional lip seal is conducted. On that basis, the algorithms and the methods used in the numerical modeling of the conventional lip seal are modified and applied to the study of the lip seal running against surface textured shafts. For each step of the study, the numerical model is benchmarked against the experimental results. Important physical mechanisms which explain the reverse pumping ability of the triangular surface structures are revealed. Meanwhile, the accuracy of
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6

Wu, Yuanjie. "Study Of Interface Friction Reduction Using Laser Micro-Textured Die Surfaces In Metal Forming." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1222022465.

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7

Vyas, Prerit. "Effects of Stochastic (Random) Surface Roughness on Hydrodynamic Lubrication of Deterministic Asperity." UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_theses/344.

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In order to achieve enhanced and cost-effective performance of engineering components, Surface Engineering embraces traditional and innovative surface technologies which modify the surface properties of metallic and non-metallic engineering components for specific and sometime unique engineering purposes. The surface roughness of an engineered surface may be classified as: the random surface roughness which is a product of surface finishing and the deterministic surface roughness which is engineered to increase the lubrication characteristics of the hydro dynamically lubricated thrust ring. Th
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8

Hichri, Yosra. "Adhérence des chaussées contaminées par des particules." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0024/document.

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La thèse vise à prédire l’adhérence des chaussées contaminées par des particules fines. Ces particules se déposent sur la chaussée pendant les périodes sèches et agissent, seules ou se mélangeant avec l’eau de pluie, comme un lubrifiant à l’interface pneu/chaussée. La démarche de recherche est basée sur l’approche du troisième corps en distinguant les phases de dépôt et de lessivage des particules par la pluie. Les particules sont caractérisées par leur distribution granulométrique et leurs compositions chimique et minéralogique. L’étude est menée à trois échelles : globale, par des mesures de
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9

Spencer, Andrew. "Optimizing surface texture for combustion engine cylinder liners." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17001.

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The Piston Ring - Cylinder Liner (PRCL) contact is the single largest contributor to frictional losses in an internal combustion (IC) engine, causing 20-40% of all mechanical losses. If these mechanical losses can be reduced by 10% then vehicle fuel efficiency could be increased by approximately 1.5-2.5%. In todays automotive industry fuel efficiency is one of the most important factors in vehicle design due to increasing concerns about energy security, increasing fuel prices and climate change. The objective of this project is to optimise the cylinder surface texture, which when referring to
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10

Parmar, Utsav Kamleshbhai. "The Effects of Micro-dimple Texture on the Friction and Thermal Behavior of a Point Contact." Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1462365682.

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11

Tamatam, Lakshminarayana Reddy. "Tribological performance of different crankshaft bearings in conjunction with textured shaft surfaces." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65511.

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Improving vehicle efficiency and complying to stricter exhaust emission legislations are some of the driving factors to advancement in technology of engine components. The main bearings in an internal combustion engine contribute significant amount of friction. These bearings support engine loads and allow free rotation of the crankshaft. The bearings consist of a steel backing, a lining material and an optional overlay. The overlays help to minimize friction and enhance seizure resistance during adverse operating conditions. The aim of the thesis is to study the friction and wear performance
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12

Noutary, Marie-Pierre. "A robust Reynolds solver for textured surfaces in the piston ring cylinder liner contact." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI105/document.

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Le contact Segment-Piston-Chemise (SPC) est essentiel pour la réduction des émissions de CO2 et de polluants dans les moteurs automobile. Pour optimiser ces deux contraintes antagonistes, il est nécessaire d’étudier l’influence de la microgéométrie afin de trouver de nouvelles architectures de ce contact. L’étude expérimentale étant très coûteuse, il est impératif de pouvoir modéliser les performances du contact SPC. Les méthodes multigrilles permettent de réduire considérablement les temps de calcul. Pour le contact SPC, les méthodes multigrilles classiques perdent leur efficacité en présence
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13

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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14

Adjemout, Mohand. "Étude théorique et expérimentale de la lubrification entre surfaces texturées. Application aux garnitures mécaniques." Thesis, Poitiers, 2015. http://www.theses.fr/2015POIT2259/document.

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L'objectif principal de cette thèse est de conduire, à travers une étude théorique et expérimentale, vers une meilleure compréhension des différents effets induits par la texturation de surface dans un contact lubrifié. Le but ultime est de proposer un motif de texture qui permette de réduire le frottement et le niveau de fuite d'une garniture mécanique. L'étude bibliographique a permis d'identifier les différents travaux théoriques et expérimentaux réalisés sur la lubrification en présence de textures, les phénomènes physiques interagissant avec les textures et les différentes méthodes utilis
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15

Gherca, Andrei. "Modélisation de la lubrification des surfaces texturées - Application à la butée en régime hydrodynamique." Phd thesis, Université de Poitiers, 2013. http://tel.archives-ouvertes.fr/tel-00943143.

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La compréhension et la modélisation d'un contact lubrifié en présence de texturation nécessitent une description physique très fine pour comprendre les analyses contradictoires et pour expliquer les résultats très différents en terme de performance présentés dans la littérature internationale. De nombreuses études théoriques et expérimentales ont montré que la texturation des surfaces pourrait améliorer les caractéristiques tribologiques des contacts. La capacité de charge, le coefficient de frottement et la résistance à l'usure sont les principales caractéristiques susceptibles d'être amélior
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16

Pettersson, Ulrika. "Surfaces Designed for High and Low Friction." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Univ.-bibl. [distributör], 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-5835.

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17

Tzu-ChunChang and 張子峻. "Homogenization of Hydrodynamic Lubrication Problems with Textured Surfaces." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/49920932932506098812.

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碩士<br>國立成功大學<br>材料科學及工程學系碩博士班<br>101<br>With the development of the micro-machining process technology, manufacturing regular micro structures on surface with a high precision is feasible. While analyzing hydrodynamic lubrication effects induced by surface roughness, it requires enormous calculation time and tremendous memory space, in order to build extremely dense meshes. In some worse situations, the meshes cannot even be built. To solve the problem, averaging techniques have been developed recently. Flow factor and homogenization are the most famous averaging techniques in Tribology. Flow
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18

Lai, Chao-Ju, and 賴昭如. "Construction and Analysis of Lubrication and Friction Model for Sliding Surface with Textures." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/69543249354035676367.

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碩士<br>國立中興大學<br>機械工程學系所<br>105<br>The function of the guideway is to carry the load and guide the direction of motion. The hard rail, a surface-to-surface contact guideway, is particularly employed in the situation of motion at high loading. In such a guideway, lubrication between contacted surfaces is important. Although literatures showed texture patterns, serving as lubricant reservoir, are design and fabricated based on empirical methods, it is necessary to develop a theoretical model for analyzing lubrication and friction characteristics of sliding surface with textures. In this paper, CA
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