Дисертації з теми "Lubricating textured"
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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/.
Повний текст джерелаThis work was conducted by experimental tests in order to evaluate the effect of surface texture on fully formulated oil and base-oil performance. In these tests, the materials were related to the piston ring and cylinder, in which surfaces were sanded, grounded and textured by laser. In addition, the tests were carried out by reciprocating movement and boundary conditions. A coefficient of friction study in reciprocating tests was performed, showing that peak-to-peak methodology does not represent properly the tribosystem efficiency. Burr was generated around the dimples (made by laser surface texturing), in which were removed by sanded process. The results showed that sanded process increased the peak radius and decreased the peak height. The results considering the base oil showed oxide formation on the surface in all the cases, occurring low variation of friction coefficient in the system. On the other hand, in the fully formulated oil results, the dimples had no influence on MoS2 formation; however, it was possible to see a strong relation with the radius and average height of the asperities.
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.
Повний текст джерелаTitle 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).
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.
Повний текст джерелаAli, 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.
Повний текст джерелаLi, Wei. "EXPERIMENTAL BENCHMARKING OF SURFACE TEXTURED LIP SEAL MODELS." UKnowledge, 2012. http://uknowledge.uky.edu/me_etds/14.
Повний текст джерелаWu, 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.
Повний текст джерелаVyas, Prerit. "Effects of Stochastic (Random) Surface Roughness on Hydrodynamic Lubrication of Deterministic Asperity." UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_theses/344.
Повний текст джерелаHichri, Yosra. "Adhérence des chaussées contaminées par des particules." Thesis, Ecole centrale de Nantes, 2018. http://www.theses.fr/2018ECDN0024/document.
Повний текст джерелаThe thesis aims to predict the skid resistance of road surfaces contaminated by fine particles. These particles are deposited on the road during dry periods and act, alone or mixing with rainwater, as a lubricant at the tire / road interface. The research methodology is based on the third body approach by distinguishing the phases of deposit and washing of particles by rain. Particles are characterized by their size distribution and their chemical and mineralogical compositions. The study is conducted at three scales: global, by measurements of friction and third body masses (particles during the deposit phase and the water / particles mixture during the washing phase); in the contact area by analyses of third body flows; and at the particle level by SEM observations. Particle flows during the deposit phase are identified by visualizations with a high-speed camera. The interaction between the particles and the road surface texture is highlited by microscopic observations. Flow modeling is used to estimate the coverage rate of a surface that, in turn, is used as a weighting factor to calculate the coefficient of friction during the deposit phase. In the presence of water, the volume fraction of the particles is used to estimate the viscosity of the mixture. The coefficient of friction during the washing phase depends on this viscosity and the coverage rate of the surface. Results are discussed in terms of the influence of particle characteristics (concentration,size) and road surface texture
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.
Повний текст джерелаGodkänd; 2010; 20101115 (spencer); LICENTIATSEMINARIUM Ämnesområde: Maskinelement/Machine Elements Examinator: Professor Roland Larsson, Luleå tekniska universitet Diskutant: Professor Michel Cervantes, Luleå tekniska universitet Tid: Fredag den 17 december 2010 kl 13.00 Plats: E231, Luleå tekniska universitet
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.
Повний текст джерелаTamatam, 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.
Повний текст джерелаNoutary, 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.
Повний текст джерелаThe piston ring cylinder liner (PRCL) contact is essential in the CO2 and pollutant emission reduction in internal combustion engine. These two constraints being antagonistic, a compromise has to be found and it is necessary to study the microgeometry influence in order to find new PRCL contact architectures. As experimental study can be very expensive, modeling PRCL contact performance becomes crucial. Multigrid methods allow a huge reduction of the computational time. Unfortunately, in presence of texture, classical multigrid efficiency decays significantly and are not usable. A new algorithm based on an approach developed by Alcouffe et al. was designed that allows the study of the hydrodynamic lubrication of this contact even in the case of a highly varying geometry due to the texture. The obtained code was validated by comparison with a 1D analytical model, its performance was evaluated and a first study of an analytic cross hatched geometry parameter influence on the load carrying capacity was completed. The code was modified to include flow conservation. A relaxation process based closer to the physics phenomenon is used. The code efficiency is not the one that is expected from multigrid technics. However it convergence is sufficiently fast to study the dimple influence for the oil control ring and show the importance of partial texturing. Finally the transient term of the Reynolds equation is accounted for. In the case of a parabolic ring and for a cross hatched liner, the influence of the groove parameters ( depth, width, distance and groove angle) on the average minimum film thickness with respect to the smooth case is analyzed
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.
Повний текст джерелаSurface texturing is a recent topic which has raised a great interest in contact dynamics. For many years, engineers have favored smooth surfaces with low roughness in order to minimize friction losses. Inspired by textured surfaces which can be commonly found in nature, the research in surface topography is now focused on texturing and roughness characterization. Considering the great potential of surface texturing, many research studies analyze this subject, most commonly theoretically, while experimental works are often performed with inadequate equipment which does not allow a proper evaluation of the involved physical phenomena. This study uses an experimental approach in order to analyze the behavior of hydrodynamic thrust bearings with parallel textured pads. The experimental device is equipped with 80 sensors which allow a proper assessment of the phenomenology at the film/pad interface. This analysis focuses on the capability of this textured component to be integrated in an industrial environment. To objectify the results, the tests are conducted on ten hydrodynamic thrust bearings, among which four are textured. The comparison between the performances of these bearings facilitates their classification in terms of load-carrying capacity, friction loss and wears resistance during the start-up period. Results show that for the studied configurations, the textured thrust bearings cannot compete with pocketed or tapered land thrust bearings in terms of load-carrying capacity. In the case of parallel thrust bearings, surface texturing can help to reduce friction up to 30% at low loads while for heavy loads, their performance is equivalent or even lower than that of
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.
Повний текст джерелаThe main objective of this thesis is to lead, through a theoretical and experimental study, to a better understanding of the various effects induced by surface texturing in lubricated contacts. The ultimate goal is to provide a texture pattern that reduces friction and leakage of a mechanical seal. The literature review identified different theoretical and experimental works performed on lubrication in the presence of textures, physical phenomena interacting with textures and the different methods used for their manufacturing. A theoretical study using a conservative model based on Reynolds equation is then presented. In the first part of this study, the friction surfaces are assumed perfectly parallel and thermoelastic effects are neglected. ln the second part, heat transfer to the rings and thermoelastic deformations are taken into account. A parametric study then allows bettering our understanding of the influence of geometrical parameters of textures, defects and thermoelastic deformations of the faces on the performance of a mechanical seal. In addition, this study has identified a texture capable of significantly improving the performance of a mechanical seal. Experimental tests were then carried out with bath textured and untextured mechanical seals. Friction torque measurements and temperature measurements achieved by means of infrared thermography have shown that the use of textures allows to significantly reduce heat and friction torque compared with a seal with smooth surfaces. Finally, a comparison theory/experiment validated the developed model that predicts correctly the behavior of the textured mechanical seal
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.
Повний текст джерелаPettersson, 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.
Повний текст джерелаTzu-ChunChang and 張子峻. "Homogenization of Hydrodynamic Lubrication Problems with Textured Surfaces." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/49920932932506098812.
Повний текст джерела國立成功大學
材料科學及工程學系碩博士班
101
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 factor used to be a well-known method because of its characteristic to deal with random surface that cannot be dealt by homogenization. Compared to the flow factor, homogenization is based on much rigorous theories mainly deduced from reasonable boundary setting. Thus, homogenization is much more reliable than flow factor. In order to make homogenization easier to use, this paper modified the original homogenized Reynolds Equation by using curve fitting techniques and Mohr’s circle theory, which simplifies the solution process significantly. It should be noted that this is the first time curve fitting techniques have been used in homogenization. Also, some discussions about the relationship between load and several parameters of texture such as orientation, aspect ratio and density are included in this article.
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.
Повний текст джерела國立中興大學
機械工程學系所
105
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, CAE software is employed to construct the lubrication and friction model for sliding surface with simple texture. First, the half-Sommerfeld boundary condition is used to simulate the cavitation effect. The effective thickness of lubricant and the corresponding friction are then computed based on the load and the bearing capacity of the oil pocket. Experiments to measure the friction forces are then conducted for comparisons. It showed that there exists an offset between theoretical results and experimental data, though both results showed the same tendency. Considering the lubricant induces an angle of attack during sliding, the friction model with an attack angle is constructed for exploring the loading capacity, which means the load is supported by both oil pocket and sliding surface. Results showed that the hydrodynamic pressure caused by the angle of attack at 1.4×10^-5 rad under 4.141 KPa surface pressure and at 8×10^-6 rad under 9.886 KPa surface pressure are close to experimental results. This research work provided a method to solve the problem in analyzing the loading and friction of sliding surfaces with textures due to tiny aspect ratio of lubricant film. The friction model for sliding surface with textures is constructed and verified its reasonability through experiments.