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Dissertations / Theses on the topic 'Tribology; Lubrication'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Björling, Marcus. "Friction in Elastohydrodynamic Lubrication." Doctoral thesis, Luleå tekniska universitet, Maskinelement, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17478.

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Today, with increasing demands on industry to reduce energy consumption and emissions, the strive to increase the efficiency of machine components is maybe bigger than ever. This PhD thesis focus on friction in elastohydrodynamic lubrication (EHL), found in, among others, gears, bearings and cam followers. Friction in such contacts is governed by a complex interaction of material, surface and lubricant parameters as well as operating conditions. In this work, experimental studies have been conducted that show how friction varies over a wide range of running conditions when changing parameters

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2

Shirzadegan, Mohammad. "Elastohydrodynamic Lubrication of Cam and Roller Follower Applications: : Fast and Reliable Predictions of Friction." Doctoral thesis, Luleå tekniska universitet, Maskinelement, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-60375.

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Modelling and simulation in tribology, and more specifically of friction in lubricated contacts, has gained increasing attention over the past years. In a lubricated contact, the dissipation of energy is due to the relative motion of the mating surfaces and arise due to direct contact as well as shearing of the lubricant film. The presence of a thin lubricant film is crucial for the operation of various machine elements, e.g., for the concentrated contact between the rolling element and the raceway in a bearing. The contact in this type of applications is typically exhibiting substantial elast

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3

Larsson, Roland. "Lubrication at impact loading." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 1994. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17267.

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4

Morales, Espejel Guillermo Enrique. "Elastohydrodynamic lubrication of smooth and rough surfaces." Thesis, University of Cambridge, 1993. https://www.repository.cam.ac.uk/handle/1810/260244.

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Different aspects of Elastohydrodynamic Lubrication (EHL) are studied. For smooth surfaces, a novel approach which solves separately the inlet and outlet regions by using the fracture mechanics equations, is proposed to solve EHL line contacts for shape and pressure. For rough surfaces, the full EHL geometry is reduced to an infinitely long contact with known mean film thickness and pressure; so real-roughness steady state analyses are carried out by considering the separate Fourier components of roughness and pressures, transient analysis by applying general finite difference methods. The sub

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5

Sahlin, Fredrik. "Hydrodynamic lubrication of rough surfaces." Licentiate thesis, Luleå : Luleå University of Technology, 2005. http://epubl.luth.se/1402-1757/2005/83.

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6

Baart, Pieter. "Grease lubrication in radial lip seals." Licentiate thesis, Luleå : Luleå University of Technology, 2009. http://pure.ltu.se/ws/fbspretrieve/2760890.

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7

Baart, Pieter. "Grease lubrication mechanisms in bearing seals." Doctoral thesis, Luleå, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26652.

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Rolling bearings contain seals to keep lubricant inside and contaminants outside the bearing system. These systems are often lubricated with grease; the grease acts as a lubricant for the bearing and seal and improves the sealing efficiency. In this thesis, the influence of lubricating grease on bearing seal performance is studied. Rheological properties of the grease, i.e. shear stress and normal stress difference, are evaluated and related to the lubricating and sealing performance of the sealing system. This includes the seal, grease and counterface. The grease velocity profile in the seal

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8

Smarajit, R. "The tribology of the overhead cam train in automobile." Thesis, Brunel University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383028.

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9

Ukonsaari, Jan. "Tribology of journal bearings under environmentally adapted lubrication with shaft oscillation." Doctoral thesis, Luleå, 2004. http://epubl.ltu.se/1402-1544/2004/22/index.html.

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10

Mofidi, Mohammad. "Tribology of elastomers." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-18278.

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In this work, the tribological behaviour of different sealing elastomers has been studied. The influence of aging of a sealing elastomer in different lubricants on its tribological behaviour has been investigated. Tribological behaviour of sealing elastomers in dry condition and the mechanisms occurring in run-in period have been studied. Further studies pertaining to the influence of lubrication on the abrasive wear of a sealing elastomer have also been carried out.<br><p>Godkänd; 2007; 20071128 (ysko)</p>

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11

Cupillard, Samuel. "Lubrication of conformal contacts with surface texturing." Licentiate thesis, Luleå : Luleå University of Technology, 2007. http://epubl.ltu.se/1402-1757/2007/13/.

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12

Almqvist, Andreas. "Rough surface elastohydrodynamic lubrication and contact mechanics." Licentiate thesis, Luleå, 2004. http://epubl.luth.se/1402-1757/2004/035.

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13

Shirzadegan, Mohammad. "Elastohydrodynamic Lubrication of Cam and Roller Follower." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26291.

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Modelling and simulation of friction is a research issue that still requires an extensive amount of input from the scientific community. In a lubricated system, the dissipation of energy is connected to the direct contact between the surfaces, or more precisely the tribofilms, as well as of the shearing of the lubricant film. Elastohydrodynamic lubrication (EHL) is a lubrication regime which is characteristic for contacts found in machine components such as in roller bearings, gears and cam mechanisms. These contacts have in common that they carry load on a very small/concentrated area and exh

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14

Waara, Patric. "Wear reduction performance of rail flange lubrication." Licentiate thesis, Luleå, 2000. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26422.

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Rail and rail wheel flange wear on the rail track has been a problem of attention for the last 30 years. The problems arise in curves and depend on increased traffic volume, heavier axle load and also higher speed. Axle loads of 22,5-25 ton is common nowadays and the trend is towards heavier axle loads where the next step is 30-35 ton. Flange wear includes both wheel and rail flanges and is therefore a problem for the operating company as well as the infrastructure owner. The flange wear depend mainly on the number of passed axles, type of traffic, speed and curve radius but also the axle load

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15

McCarthy, Donald. "Lubrication of sliding bearings for hydropower applications." Licentiate thesis, Luleå, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26457.

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The term "sliding bearing" refers to types of bearing where two conformal surfaces (usually the stationary bearing and a moving shaft) slide relative to one another with load distributed directly across the interface. A suitable lubricant may be employed to reduce the friction between these two surfaces. In "fluid film" bearings, this lubricant builds up a layer of sufficient thickness such that the two surfaces are completely separated. Examples include journal and thrust bearings and shaft bushings. Unlike ball or roller bearings which have a limited lifespan, sliding bearings have, at least

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16

Alliston-Greiner, Alexander Frank. "The role of zinc dialkyldithiophosphate additives in lubrication." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278357.

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17

Wu, Jiunn-Jong. "Surface roughness and its role in contact." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.363100.

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18

Nilsson, Daniel. "Tribology of hydraulic motor." Licentiate thesis, Luleå : Luleå University of Technology, 2009. http://pure.ltu.se/ws/fbspretrieve/2760914.

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19

Grimble, David. "Ultra-thin film tribology of elastomeric seals in pressurised metered dose inhalers." Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/6376.

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Within pressurised Metered Dose Inhalers (pMDIs) the contact between the valve components and elastomeric seals is of major significance, representing the main contributory factor to the overall system frictional characteristics. Therefore, the seal performance is extremely important and must be optimised to meet the contradictory requirements of preventing leakage and allowing smooth actuation. The environmentally driven trend to HFA formulations as opposed to CFC based ones has deteriorated this problem due to poor lubrication conditions and it has, consequently, increased the frictional los

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20

Gu, Jingjing. "Ternary Oxide Structures for High Temperature Lubrication." Thesis, University of North Texas, 2015. https://digital.library.unt.edu/ark:/67531/metadc804963/.

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In this research, a temperature dependent tribological investigation of selected ternary oxides was undertaken. Based on the promising results of previous studies on silver based ternary oxides, copper based ternary oxides were selected to conduct a comparative study since both copper and silver are located in the same group in the periodic table of the elements. Two methods were used to create ternary oxides: (i) solid chemical synthesis to create powders and (ii) sputtering to produce thin films. X-ray diffraction was used to explore the evolution of phases, chemical properties, and structur

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21

Almqvist, Torbjörn. "Computational fluid dynamics in theoretical simulations of elastohydrodynamic lubrication." Doctoral thesis, Luleå, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26754.

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The work presented in this thesis concerns computer simulations of lubrication processes, and the main part deals with simulations in the elastohydrodynamic lubrication (EHL) regime. The thesis summarises the work performed in the five papers referred to as Paper A, B, C, D and E. The aim is to give the reader a more explanatory description of the investigations performed in the papers and of the physical processes present in EHL. Lubrication is a sub-area of tribology, which is the science of interacting bodies in relative motion, two other sub-areas being wear and friction. Lubrication is co

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22

Rapetto, Marco. "Rough surfaces in contact : artificial intelligence and boundary lubrication." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25874.

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Interacting surfaces are found in mechanical systems and components. Since engineered surfaces are not perfectly smooth, only a fraction of the nominal surface area is actually in contact. This fraction is denoted as the real area of contact, Ar, and is formed by the sum of the contact spots between the two touching surfaces. If these contacting surfaces are sliding, then friction and wear occur in these actual contacts. Friction and wear may be controlled by lubrication: depending on the operating conditions different types of lubrication regime exist. When the surfaces are completely separat

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23

Dong, Sheng. "Friction and Wear Reduction via Ultrasonic Lubrication." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1437560338.

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24

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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25

Scholes, Susan Claire. "The tribology of hard bearing surfaces for use in hip prostheses." Thesis, Durham University, 1999. http://etheses.dur.ac.uk/1475/.

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26

Philip, Croné. "Thermo-Elasto-Hydrodynamic lubrication modeling of Tilting Pad Journal Bearings." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-71105.

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The journal bearing is a critical machine element typically used to support rotating motion in high speed machinery. Through the generation of a hydrodynamic pressure in its thin lubricant film,which is usually in the order of 10-100μmthick depending on the diameter of the journal itself, the bearing is able to withstand large loads, both statically and dynamically, while having a very low rate of wear. It is of course essential that these components provide for a safe operation with as little wear and frictional losses as possible and it is therefore of great interest to develop simulation mo

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27

Chitta, Sudeendra. "Elastohydrodynamic lubrication in spur gear and helical gear contacts." Thesis, KTH, Maskinkonstruktion (Avd.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-151246.

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The gears in a transmission are lubricated to prevent their premature failure as a result of pitting and wear on the tooth surfaces. Furthermore, the lubricant also limits the rise in surface temperature of the gears, which could otherwise lead to failure as a result of scuffing. The purpose of this thesis was to construct a fairly realistic theoretical lubrication model for spur and helical gears, the primary output parameters of this model being film thickness and flash temperatures, which would help in the identification of areas on the gear tooth surface prone to the aforementioned modes o

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28

Kollia, Vasiliki. "Compatibility of surface treatments and oil/additive systems under boundary lubrication." Thesis, Heriot-Watt University, 2001. http://hdl.handle.net/10399/543.

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29

Cioc, Carmen. "An elastohydrodynamic lubrication model for helicopter high-speed transmission components /." SeeFull Text at OhioLINK ETD Center (Requires Adobe Acrobat Reader for viewing), 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=toledo1100618919.

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Dissertation (Ph.D.)--University of Toledo, 2004.<br>Typescript. "A dissertation [submitted] as partial fulfillment of the requirements of the Doctor of Philosophy degree in Engineering." Bibliography: leaves 220-247.

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30

Isaksson, Patrik. "Simulation of tribology in hydraulic motors." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26381.

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Tribology is the science of friction, lubrication and wear. A tribological interface is composed of two contacting surfaces in relative motion. The radial piston hydraulic motor includes a lot of tribological interfaces. The interfaces are made up of the contacts between the moving parts in the motor that transform energy in the form of hydraulic flow into motion of the output shaft. Many of them are highly loaded due to the large forces that must be transmitted to produce the required torque. The performance in view of efficiency of the hydraulic motor depends strongly on the tribological pro

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31

Roselin, Fredrik. "Simulation of Tribological Contacts in Hydraulic Machines." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-69049.

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Axial piston machines are operating at high pressure and varying speeds, which requires high reliability of the components. The machine components are separated by a fluid film, but sometimes this film gets penetrated by the surface asperities causing the machine to operate with metal-to-metal contact. In order to improve the design and predict the operating conditions might numerical tools be used. The goal with this thesis was to describe how the tribological contacts in Parkers machines can be modelled, considering oil and surface roughness. The so called Luleå Mixed Lubrication Model have

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32

Jackson, Robert Lee III. "The wear and thermo-elastohydrodynamic behavior of thrust washer bearings under non-axisymmetric loads." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5230.

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The goal of this work is to investigate the physical mechanisms that distress thrust washer bearings through physical modeling and numerical techniques. The thrust washer bearing is subjected to non-axisymmetric loads within the planetary gear sets of automatic transmissions in automobiles. In practice the thrust washer bearing often distresses severely and unpredictably, causing transmission breakdown and liability issues. A specially designed thrust washer bearing test rig allows for controlled variation of the operational parameters (speed, load, lubrication flow rate, etc.) governing th

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33

Hasan, Abdullah Mohammed. "Quantitative Laser-based Assessment of Top of Rail Friction Modifiers for Railroad Application." Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/70916.

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The primary purpose of this study is to assess the effectiveness and utility of laser-based sensors for measuring, quantitatively, the presence and extent of top-of-rail (TOR) friction modifiers that are commonly used in the railroad industry for reducing friction between railcar wheels and rail. Modifying the friction between the wheel and rail is not only important for significantly reducing rolling resistance, but it also contributes to reducing wheel and rail wear, lowering rolling contact fatigue, and potentially curving resistance. It is common to monitor rail lubrication empirically by

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34

Almqvist, Torbjörn. "Numerical simulation of elastohydrodynamic and hydrodynamic lubrication using the Navier-Stokes and Reynolds equations." Licentiate thesis, Luleå, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17230.

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The work presented in this thesis concerns computer simulations of the lubrication process. The main subject of interest is elastohydrodynamic lubrication (EHL) and, to some extent, hydrodynamic lubrication (HD). The thesis comprises an introductory section and three papers; referred to as A, B and C. Simulation of EHL is an inter-disciplinary task, incorporating the fields of fluid mechanics, solid mechanics, thermodynamics and rheology. In almost all numerical simulations of lubrication performed today, the hydrodynamics are modelled using the Reynolds equation. This equation is derived from

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35

Miller, Bradley A. "New numercial and semi-analytical formulations for the dynamic analysis of gas lubricated triboelements." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/16102.

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36

Kalle, Kalliorinne. "Automated Design Analysis and Lubrication Optimisation for a Heavy-Duty Piston." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-74386.

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37

Profito, Francisco José. "Modelagem unidimensional do regime misto de lubrificação aplicada a superfícies texturizadas." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-29112010-155407/.

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O presente trabalho aborda a modelagem unidimensional do regime misto de lubrificação para problemas caracterizados por condições genéricas de carga, velocidade e geometria. Tal modelagem foi desenvolvida a partir de modelos clássicos, tais como a equação de Reynolds relacionada com os fenômenos hidrodinâmicos, e as formulações de Greenwood & Williamson e Greenwood & Tripp utilizadas na descrição do contato de asperezas entre superfícies rugosas. A cavitação do fluido lubrificante foi considerada através dos modelos tradicionais de half-Sommerfeld e Swift-Steiber (Reynolds). Com relação à reol

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38

Nyberg, Erik. "Lubrication mechanism of hydrocarbon-mimicking ionic liquids." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65505.

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Lubrication is critical in order to achieve high efficiency and reliability of machine elements such as gears, bearings, and other moving mechanical assemblies (MMA). In space applications, tribological properties of lubricants are quickly growing more important. Traditional space systems such as satellites imply MMA such as gyroscopes, antenna pointing mechanisms, and solar array drives. These MMA operate in high vacuum (<10-5 Pa) under lightly loaded conditions. Modern space missions on the other hand, such as remotely operated vehicles used for in-situ Mars exploration relies on differen

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39

Pelcastre, Leonardo. "Hot forming tribology : galling of tools and associated problems." Licentiate thesis, Luleå tekniska universitet, Maskinelement, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-25915.

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In recent years, the use of ultra high-strength steels (UHSS) as structural reinforcements and in energy-absorbing systems in automobiles has increased rapidly; mainly in view of their favourable strength to weight ratios. However, due to their high strength, the formability of UHSS is poor, thus complex-shaped UHSS components are invariably produced through hot-metal forming processes. The use of hot stamping or press hardening, which was developed during the 1970’s in northern Sweden, has become increasingly popular for the production of ultra high strength steels. In hot stamping, different

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40

Mäki, Rikard. "Wet clutch tribology : friction characteristics in limited slip differentials." Doctoral thesis, Luleå, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26662.

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In recent years, electronically controlled automotive transmission systems, where wet clutches are used as intelligent differentials, have appeared in the market. These applications impose great demands on the transmission fluids and friction materials used as well as on controllability and vibration preventive (anti-shudder) properties of the clutch systems. This thesis focuses on transmission fluids used in wet clutches in all- wheel drive systems. The investigated all-wheel drive system, featuring a wet multi-plate clutch with a sintered brass based friction material, is described.

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41

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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42

Owellen, Michael C. "Biotribology: The Effect of Lubricant and Load on Articular Cartilage Wear and Friction." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36872.

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This paper presents a biotribological study on cartilage wear and friction, using a system of cartilage-on-stainless steel. This study is a part of the ongoing biotribology research by Dr. Furey at the Virginia Polytechnic Institute and State University.<p> Two loads (65 N and 20 N) and three lubricants (saline reference, reference + hyaluronic acid, and bovine synovial fluid) were tested and evaluated using several analysis techniques. These techniques included wear analysis by hydroxyproline measurement, scanning electron microscopy (SEM), histologic sectioning and staining, nume

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Lagleize, Jeanne Marie. "Morphologie et propriétés mécaniques de films lubrifiants auto-assemblés réticulés en milieu aqueux." Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14175/document.

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Ce travail s’intéresse au renforcement mécanique de films lubrifiants auto-assemblés en milieu aqueux par réticulation. Deux stratégies ont été suivies. La première consiste à réticuler physiquement un film de tensioactifs cationiques par coadsorption d’un copolymère associatif anionique. La deuxième est de réticuler chimiquement un film de copolymères triblocs par la création de liaisons covalentes entre les différentes macromolécules. Nous étudions l’auto-assemblage des films par microbalance à cristal de quartz et microscopie à force atomique (AFM). Nous discutons ensuite les effets de la r

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Kurnia, Evan. "High Temperature Tribology in Hot Stamping." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-75695.

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Many automotive components are made of Al-Si coated ultra-high strength boron steel (UHSS) and are produced by hot stamping process. In this process, the workpiece is heated to an austenitizing temperature and is then formed and quenched simultaneously between the tools to achieve the desired shape and high strength. During hot stamping process, friction and wear occur which affect formability and maintenance intervals for tool replacement and repair. To repair worn tools, metal is deposited by fusion welding technique. The tribological behaviour of repair welded tool steel sliding against Al-

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45

Figueiredo, Tiago Petermann. "Effect of lubricant propertieson the friction coefficient under different temperatures, speeds and loads using a ball-on-disc test." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3151/tde-16032017-102949/.

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The present study has the objective of evaluating the effect of lubricant features on the friction coefficient by using three different lubricants (two synthetics and one mineral), which are used in automotive transmissions. In order to perform experiments, it was used a ball-on-disc system. The disc was manufactured with the same mechanical properties as transmission gears and the ball was made of 52100 SAE steel. The test parameters were defined based on a dynamic analysis conducted using \"ISOCAD\" which takes into account the geometry of the gear and vehicle dynamics (applied force and spe

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46

Lindquist, Mattias. "Self Lubrication on the Atomic Scale : Design, Synthesis and Evaluation of Coatings." Doctoral thesis, Uppsala universitet, Institutionen för teknikvetenskaper, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8443.

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In this thesis a new design concept of tribologically active coatings aimed for low friction applications, have been explored. Materials modeled by ab initio DFT calculations were realized through deposition of carbide and nanocomposite coatings by DC-magnetron sputtering. The design concept employs destabilization of a carbide material by alloying with a weak carbide-forming element, which refines the structure into a nanocomposite. The destabilization creates a driving force for superficial ejection of carbon in a tribological contact, forming a lubricious graphitic carbon layer. The otherwi

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47

Hardell, Jens. "High temperature tribology of high strength boron steel and tool steels." Licentiate thesis, Luleå : Luleå University of Technology, 2007. http://epubl.ltu.se/1402-1757/2007/36/index.html.

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48

Talluri, Srikrishna. "Pretreatment of Small Four-Stroke Engine Components for No-Oil Hot Tests." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/36058.

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"Hot-tests" form a vital facet towards the end of the production line of modern automotive plants, where the condition of the engine is checked by running it for a short period of time, to ensure its performance under standard operating conditions. The duration of hot-tests for small engines varies from 20-75 seconds. In the conventional procedure, about 10-30 grams of lubricant (for pre-coating) is used with about 650ml of standard oil for engine testing. However, about 1-3 oz. of oil is lost per engine, as it cannot be sucked out of the crankcase after the hot tests. The loss of 1-3 oz.

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Samak, Mihir. "Role of Serum Albumin Aggregation in Lubrication and Wear Protection of Shearing Surfaces." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39403.

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Abstract:

Healthy articular joints exhibit remarkable lubrication due in large part to the complex rheological and tribological behavior of the synovial fluid (SF) that lubricates the joints. Current approaches that seek to elucidate such remarkable lubrication usually focus on the roles of high molecular weight SF components such as lubricin and hyaluronic acid but frequently overlook the role of serum albumin (SA), although it represents 90% of the protein content of SF. In this thesis, we used the Surface Forces Apparatus to investigate in detail the structural and tribological response of SA thin fi

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Hamouda, Karim. "Bronze-Steel Friction Characteristics under the Lubrication of Modified Water/Glycerol Mixtures." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65217.

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Increasing environmental awareness has driven a lot of research to look into various environmentally friendly lubricants which can replace more conventional mineral oil based lubricants. This is true in particular for marine and hydropower applications where the risk of lubricant leakage can be damaging to the local environment. Glycerol is an organic compound produced as a byproduct when producing Biodiesel. It is environmentally friendly and has been used by the pharmaceutical and food industries for a long time. Recent research has shown that glycerol has very good tribological properties a

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