Gotowe bibliografie tematyczne / Lubricating textured

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Gotowa bibliografia na temat „Lubricating textured”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Lubricating textured"

Li, Chenchen, Xuefeng Yang, Shouren Wang, Yanjun Wang, Chongyang Lu i Jinlong Cao. "Study on Friction and Lubrication Characteristics of Surface with Unidirectional Convergence Texture". Coatings 9, nr 12 (21.11.2019): 780. http://dx.doi.org/10.3390/coatings9120780.

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In order to study the influence of texture on the wear and lubrication performance of the surface of the tools, three kinds of textures with unidirectional convergence morphology were processed on the surface of the samples, and each texture was designed with different area occupancy ratios. Simulation analysis shows that, owing to the reflow and convection effect of liquid in the texture, the lubricating film flowing through the textured surface has a high hydrodynamic pressure value, and the semicircular ring texture is the most prominent. By comparing the friction coefficient, when the area occupancy ratio of texture on the surface is 10%, the surface of the samples with different morphology has the lowest coefficient of friction; the friction coefficient of the semicircular ring textured surface is especially very low. Surface textures reduce the direct contact area between the friction pairs, and generate dynamic pressure lubrication and secondary lubrication, so that the surface friction coefficient of the samples is obviously reduced. The surfaces of the non-textured samples have abrasive wear and contact fatigue wear, and the surfaces of the textured samples have adhesive wear, abrasive wear, and cavitation.

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Yang, Fuqin, Dexing Hu, Qianhao Xiao i Shun Zhao. "Experimental study on line-contact elastohydrodynamic grease lubrication properties of surface-textured rollers". Industrial Lubrication and Tribology 73, nr 3 (25.01.2021): 477–84. http://dx.doi.org/10.1108/ilt-03-2020-0079.

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Purpose This paper aims to study line-contact elastohydrodynamic grease lubrication properties of surface-textured rollers as well as the effect of different crown widths (dw) on oil film thickness under textured conditions. Design/methodology/approach The laser processing method was used to make the micro-texture on the surface of GCr15 steel rollers; lithium grease was used as the lubricant, and line-contact elastohydrodynamic grease lubrication experiments under pure sliding conditions were performed on light interference elastohydrodynamic-lubricated experimental table. Findings The results show that the line-contact elastohydrodynamic grease lubrication is closely related to the textured crown width of steel rollers. At low speeds and light loads, texturing has an inevitable inhibitory effect on the formation of the lubricating oil film, and the smaller the width of the crown area, the more obvious the inhibitory effect, which is not conducive to the improvement of the lubrication condition. At high speeds and high loads, the textured roller with dw = 1 mm has the largest oil film thickness and shows better lubrication performance. Originality/value At present, there is little research on the surface texture of line-contact friction pairs. This work explores the effect of different textured crown width on the lubricating properties of line-contact elastohydrodynamic grease lubrication by experiment. It provides a new theoretical basis for the subsequent practical application of surface texture technology.

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Bhardwaj, Vivek, R. K. Pandey i V. K. Agarwal. "Performance studies of textured race ball bearing". Industrial Lubrication and Tribology 71, nr 9 (4.11.2019): 1116–23. http://dx.doi.org/10.1108/ilt-12-2018-0445.

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Purpose The purpose of this paper is to develop an energy-efficient and dynamically improved thrust ball bearing using textured race. A texture has been used on the stationary race of the test bearing to conduct the long-duration experiment for exploring its tribological and vibrational behaviours under starved lubricating condition using micro size MoS2 blended grease. The performance behaviours of the textured race bearing have been compared with conventional bearing (i.e. having both races without textures) under the identical operating conditions for demonstrating the advantages of textured race. Design/methodology/approach Texture was created on stationary race of the test ball bearing (51308) using nano-second pulsed Nd: YAG laser. Performance parameters (frictional torque, temperature rise and vibrations) of textured ball bearings were measured under severe starved lubricating conditions for understanding the critical role of texture in the long duration of the test. S-type load cell and miniature accelerometer were used for measuring the frictional torque and vibration, respectively. Bulk temperature at stationary races (at the back side) of test bearings was measured in operating conditions using a non-contact infrared thermometer. Findings Significant reduction in frictional torque and decrease in amplitude of vibration with textured ball bearing were found even under the severe starved lubricating condition in comparison to conventional bearing. Originality/value There is dearth of research pertaining to the performance behaviours of ball bearings using textures on the races. Therefore, an attempt has been made in this study to explore the tribo-dynamic performance behaviours of a thrust ball bearing using a texture on its stationary race under severe starved lubricating condition for the longer duration of the test.

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Ma, Zhen, Junjie Song, Hengzhong Fan, Tianchang Hu i Litian Hu. "Preparation and Study on Fretting Tribological Behavior of Composite Lubrication Structure on the Titanium Alloy Surface". Coatings 12, nr 3 (3.03.2022): 332. http://dx.doi.org/10.3390/coatings12030332.

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As an excellent light metal material, titanium alloy has an important application in high technology equipment. In this study, the composite lubrication structure was prepared on the titanium alloy surface by combining the surface texture, thermal oxidation layer, and polytetrafluoroethylene (PTFE)-based lubricating coating. The effect of texture parameters and thermal oxidation layer on the fretting wear behavior of the composite lubrication structure was evaluated under a load of 50 N. The results showed that the PTFE-based lubricating coating on the textured surface showed excellent friction-reduction and anti-wear effect compared with the coating on the single smooth surface and thermal oxidation surface. The introduction of a thermal oxidation layer on the textured surface further improved the fretting wear life of lubrication coating. The friction coefficient and wear rate can be as low as 0.242 and 2.3 × 10−5 mm3·N−1m−1, respectively, under dry fretting contact conditions. Compared with the untextured surface, the longevity of the composite lubrication structure is extended by more than 90%.

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Jiang, Jie, Dang Sheng Xiong, Jian Liang Li i Yan Shi. "Tribological Properties of Laser Surface Texturing and Coating Duplex-Treated Surface". Materials Science Forum 686 (czerwiec 2011): 706–10. http://dx.doi.org/10.4028/www.scientific.net/msf.686.706.

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Components of space machines often works at high temperature and vacuum, or on other rigour conditions, the traditional liquid lubricant cannot satisfy the requirement. The common solid lubricant is hard to supply between two friction surfaces continuously and it is easily decomposed and failure at high temperature. It is an urgent need to study a new type of lubrication technology. In this paper, the surface of 1Cr18Ni9Ti with high hardness and micro dimples was prepared through laser texturing and plasma molybdenizing/plasma nitriding duplex treatment. The textured surface was coated with MoS2 lubricating film and the friction and wear properties from room temperature to high temperature were evaluated. The results show that the laser surface textured dimples trap hard abrasive particles and reduce the damage to the lubricating film, and thus decrease the wear rate. The optimum dimple density of 7.1% is obtained. At elevated temperature, the wear rate of molybdenized texture or nitrided texture is lower than that of the matrix and single textured surface.

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Hua, Xijun, Xuan Xie, Bifeng Yin, Peiyun Zhang, Jinghu Ji, Hao Wang i Yonghong Fu. "Tribological performance and self-lubricating mechanism of the laser-textured surface filled with solid lubricant in rolling friction pair". Industrial Lubrication and Tribology 70, nr 2 (12.03.2018): 371–84. http://dx.doi.org/10.1108/ilt-07-2017-0210.

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Purpose This paper aims to find out the tribological performance and self-lubricating mechanism of the laser-textured surface filled with solid lubricant in rolling friction pair. Design/methodology/approach The textures on the surfaces of GCr15 bearing steel were produced by acousto-optic Q diode-pumped yttrium aluminum garnet laser with the technology of “single pulse one time, repeating at intervals” and filled with composite solid lubricant. The tribology tests were conducted on the MMW-1A universal friction and wear testing machine. Findings It was found that the solid-lubricated micro-textured surface can reduce the friction coefficient effectively. The MoS2/PI composite solid lubricant works better than the single MoS2 solid lubricant, and the ratio of PI/MoS2 + PI at 20 per cent is the best recipe. The friction coefficient of the sample surfaces decreases first and then increases with the increase in texture densities, and a texture density of 19.6 per cent has the best effect on friction reduction. The friction coefficient of the textured surfaces gradually decreases with the increase in both rational speed and load. For the same texture density, the friction coefficient of textured surfaces decreases slightly with the increase in diameter. Furthermore, the mechanism of “rolling-extrusion-accumulation” occurred on the textured surface can collect the solid lubricant, thereby, improve the effect of lubricating and anti-friction. Originality/value The results of the experimental studies demonstrated the application prospect of laser surfaces texturing combined with solid lubricant in rolling friction pair.

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Qiang, Haowen, Guangming Gao, Sitong Ye, Linkai Cheng i Quandai Wang. "Effect of Characteristic Parameters and Distribution of Friction Pair Surface Texture on Lubrication Properties". Lubricants 11, nr 3 (14.03.2023): 139. http://dx.doi.org/10.3390/lubricants11030139.

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Based on the basic mechanism and bionics principle that texture affects the dynamic pressure effect of lubricating medium, a V-shaped texture that converges along the sliding direction is designed. Through numerical simulation, the optimal geometric parameters and distribution of the V-shaped and textures are obtained. A textured surface with various texture features is prepared using a nanosecond ultraviolet laser with bearing steel as substrate. Tribological experiments with friction and wear tester are performed to investigate the effect of characteristic parameters and distribution of surface texture on the lubrication performance and the lubrication properties are compared and analyzed with that of circular texture. Hence, this investigation provides a research direction to improve the lubrication performance between frictional pairs under fluid lubrication condition to reduce the frictional wear of mechanical systems. The results show that under the conditions of optimal parameters, due to the effect of convergence and extrusion on the flow of lubrication medium, the V-shape texture is better than the circular texture in improving the lubrication performance. The optimal characteristic parameters of V-shape texture are: 60° for the angle between the two wings, 0.53 for shape parameter, 25.9% for area ratio, 13 μm depth, 60% texture area coverage ratio, and the inlet of flow field of the texture distribution position.

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Zhang, Yu, Guoding Chen i Lin Wang. "Effects of thermal and elastic deformations on lubricating properties of the textured journal bearing". Advances in Mechanical Engineering 11, nr 10 (październik 2019): 168781401988379. http://dx.doi.org/10.1177/1687814019883790.

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Hydrodynamic journal bearing is an important part of rotary machine and faces many challenges such as high rotating speed, heavy specific pressure, and large temperature rise with the development of industry. These challenges lead to notable thermal and elastic deformations of the journal bearing. Surface texture has been proved to be a valid method to promote bearing lubricating properties. However, effects of thermal and elastic deformations on lubricating properties of the textured journal bearing have not been clearly analyzed. Based on this, the article presents a method to transform thermal–structural–fluid interaction into thermal–structural interaction and thermal–fluid interaction based on textured journal bearing model. Cavitation and temperature-viscosity effects are also considered. Based on this method, action mechanisms of surface texture on lubricating properties are discussed considering elastic and thermal deformations, and effects of elastic and thermal deformations on the textured journal bearing are also investigated. The results show that the load carrying capacity and the maximum oil film pressure of the textured journal bearing both increase when elastic and thermal deformations are considered. Optimal texture parameters can enhance the backflow effect in dimples and restraint cavitation phenomenon in the oil film rupture region. Meanwhile, inertial and cavitation effects caused by surface texture have significant effects on elastic and thermal deformations of the journal bearing.

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Wang, Hao, Xuan Xie, Xijun Hua, Bifeng Yin, Hang Du, Sheng Xu i Bai Jing Qiu. "The effect of laser surface texturing to inhibit stick-slip phenomenon in sliding contact". Advances in Mechanical Engineering 11, nr 9 (wrzesień 2019): 168781401987463. http://dx.doi.org/10.1177/1687814019874635.

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Stick-slip phenomenon in some mechanical structures, especially in machine tools, should be eliminated or inhibited, otherwise the vibration will occur and the position error will inevitably be obtained. In this study, different kinds of surface textures were carried out on the lower samples of the pin-on-disk contact. The starting process of the machine tools was simulated on an Rtec-Multi-Function Tribometer. The stick-slip phenomenon was observed in each kind of samples. However, the stick-slip phenomenon of smooth sample is larger than that of the textured samples. The bulge-textured surface shows excellent anti-stick-slip effect, and the critical stick-slip speed of bulge-textured surface is 95.9% lower than that of the smooth surface. Simultaneously, the anti-stick-slip effect of bulge-textured surface is superior to that of the dent-shaped texturing surface. What’s more, when the amount of lubricating oil is 15 mL, the standard deviation values of friction coefficient and critical speed of stick-slip phenomena (rotational speed when the standard deviation of friction coefficient is abrupt) are the lowest at different rotational speeds. It can be predicted that the bulge textures and adequate amount of lubricating oil (15 mL) can eliminate stick-slip phenomenon when processed in the surface of the machine tool because the bulge textures and adequate amount of lubricating oil can improve frictional state effectively and avoid the slip of the contact surface.

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Tang, Jie, Jie Zeng i Xin Lu. "Experimental Study on Texture Coupling Mechanism and Antifriction Performance of Piston Rod Seal Pair". Micromachines 13, nr 5 (30.04.2022): 722. http://dx.doi.org/10.3390/mi13050722.

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The effect of the coupling texture on the friction and wear of a piston rod-rubber seal pair under lubricating conditions is studied in this paper. Crescentiform textures with different area densities were fabricated on high carbon chromium bearing steel (GCr15) and ethylene propylene diene monomer (EPDM) materials by using a laser marking machine. We compare and analyze the effects of untextured, single-textured, and coupling-textured surfaces on the friction characteristics of the piston rod-rubber seal pair by conducting tests on the reciprocating module of the UMT-2 friction and wear testing machine. The results showed that the coupling-textured surface had the lowest coefficient of friction and wear compared to the untextured and single-textured surfaces. When the normal load was 10 N under the optimal coupling texture area density (6.4%), the friction and wear of the sealing pair decreased the most. Compared with the untextured surface, the friction coefficient was reduced by 27.9% and the wear amount was reduced by 30.0%; compared with the single-textured surface, the friction coefficient was reduced by 18.9%, and the wear amount was reduced by 23.8%. The coupling effect generated by the coupling texture effectively enhanced the formation and stabilization of the oil lubricant film and effectively captured wear debris, preventing it from continuously scratching the surface and reducing wear and roughness.

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Rozprawy doktorskie na temat "Lubricating textured"

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 em ensaios alternados, mostrando que os valores fornecidos diretamente pelo equipamento (aqui chamados de coeficiente de atrito pico a pico) não foram efetivos para este estudo, pois apresentam alta dispersão entre as réplicas dos ensaios e não é representativo em termos de eficiência do tribossistema. Foram geradas microcavidades nas superfícies de alguns blocos de ferro-fundido mediante texturização a laser. Esta texturização gerou rebarbas que foram retiradas por um processo de lixamento. Com isso, uma parte dos resultados avaliou o efeito do lixamento nos parâmetros de rugosidade, no entanto que o processo acaba por aumentar os valores de raio de aspereza e reduzir a altura média dos picos. Por fim, ensaios com óleo sem aditivo tiveram formação de óxido em todas as condições de superfície, com pouca variação do coeficiente de atrito. Já nos ensaios com óleo aditivado, os resultados mostraram pouca influência das microcavidades e maior contribuição das características de picos (raio e altura) na formação de tribofilmes redutores de atrito (neste caso MoS2).
This 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.

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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.
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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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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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 mikrovtisků čerstvým mazivem je pravděpodobně způsoben kapilárními jevy ve vstupní oblasti. Třecí plochy s příčnými mikrodrážkami, jejichž délka byla menší než průměr Hertzova kontaktu, potom obecně vykazovaly lepší tribologické parametry ve srovnání s hladkými povrchy. Příčné mikrodrážky vedly k výraznému nárůstu tloušťky mazacího filmu za podmínek hladovění i za extrémních provozních podmínek (protisměrný pohyb). Numerické simulace přechodových jevů příčných mikrodrážek ukázaly dobrou shodu s experimentálními výsledky.

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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 the numerical model is tested. In general, the numerical simulation results match the experimental observation well. However, there are several important discrepancies. For each discrepancy the possible causes are discussed, which benefits the further attempts of the modeling work on the lip seal running against surface textured shafts. The conclusions of this study themselves can be used as a guidance to the design of the surface textured shafts for the lip seal applications. Finally the limitation of the current theories and the modeling methods are discussed and reasonable improvements which can be done are proposed for the future work.

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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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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. The effect of stochastic/random roughness can not be ignored when the roughness is of the same amplitude as that of fluid film thickness. Average flow model derived in terms of flow factors which are functions of the roughness characteristics is used to study the random surface roughness effects on hydrodynamic lubrication of deterministic asperity. In addition, the effect of boundary conditions on flow factors is studied by calculating the pressure and shear flow factor using two different new boundary conditions. The results are obtained for random surface roughness having a Gaussian distribution of roughness heights.

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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 frottement et de masses du troisième corps (particules pendant le dépôt et le mélange eau/particules pendant le lessivage) ; dans l’aire de contact par des analyses de flux du troisième corps ;et au niveau des particules par des observations au MEB. Les flux de particules pendant la phase de dépôt sont identifiés par des visualisations avec une caméra rapide. L’interaction entre les particules et la texture de la chaussée est mise en évidence par des observations microscopiques. La modélisation des flux permet d’estimer le taux de recouvrement d’une surface qui, à son tour, est utilisé comme un facteur de pondération pour calculer le coefficient de frottement pendant la phase de dépôt. En présence d’eau, la fraction volumique des particules est utilisée pour estimer la viscosité du mélange. Le coefficient de frottement pendant la phase de lessivage dépend de cette viscosité et du taux de recouvrement de la surface. Les résultats sont discutés en termes d’influence des caractéristiques des particules(concentration, taille) et de la texture de la chaussée
The 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

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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 cylinder liners in this work means the cross-hatch grooves left by the honing process.This work focuses on simulation techniques that can be used to help optimize cylinder liner surface texture to reduce friction while at the same time minimizing oil consumption and wear. Cylinder liner surface topography is investigated with a range of measurement techniques in order to reveal all the important features of the existing surface. Different ways of characterizing surface topography based on both traditional height averaging parametersand functional parameters calculated for a range of different surface measurements are discussed. The different characterization techniques are compared to find the most appropriate way of quantitatively describing surface topographies.A full engine cycle simulation of the PRCL contact has been developed. A homogenization technique was implemented for solving the Reynolds equation. This is a two scale approach where surface roughness is treated on the local scale and surface texture plus global geometry on the global scale. A method for generating artificial surface topography based on real surface measurement data was developed. This allows for the possibility of simulating a wide range of new surface topographies in order to investigate their potential for reducing friction and minimising oil consumption and wear.
Godkänd; 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

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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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Części książek na temat "Lubricating textured"

Hongbin, Liu, Li Lun, Xue Yujun, Li JiShun i Ma Wei. "Effect of Different Textured Surfaces on Lubricating Characteristics of Area Contact Friction Pairs". W Advances in Intelligent and Soft Computing, 597–606. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10430-5_46.

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Gajrani, Kishor Kumar, Y. Bishal Singha, Mamilla Ravi Sankar i Uday S. Dixit. "Tribological and Machining Performance of Graphite-, CaF2- and MoS2-Coated Mechanical Micro-textured Self-lubricating Cutting Tool". W Lecture Notes on Multidisciplinary Industrial Engineering, 151–65. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6287-3_11.

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Kato, Koji. "Surface Texture for Water Lubrication". W Encyclopedia of Tribology, 3489–93. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-0-387-92897-5_6.

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Franco-Martínez, Francisco, Jorge Juan García Moltó, Javier Echávarri Otero, Enrique Chacón Tanarro i Andrés Díaz-Lantada. "Using Artificial Intelligence to Predict Lubricated Friction in Microtextured Mechanical Contacts". W Proceedings of the XV Ibero-American Congress of Mechanical Engineering, 432–38. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-38563-6_63.

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AbstractIt has been shown that surface microtexturing is useful for improving lubrication. It offers strong reductions in the friction coefficient under operation conditions which compromise the maintenance of full film lubrication. To study the influence of texturing in the reduction of the friction coefficient, an Artificial Intelligence algorithm will be used. Its performance will be optimized. Afterwards, the algorithm will be applied to a new set of textured surfaces with the objective of finding the optimal one, that is, the one capable of reducing friction under different operating conditions. The selection of the optimal texturing will be based on the Weighted Mean Value of the friction coefficient (WMPT), a metric that was specifically created for this purpose.

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Polcar, T. "Smart Surfaces for Lubrication: Solid Lubricants and Adaptive Texture". W Coating Technology for Vehicle Applications, 203–14. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14771-0_12.

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Sulaiman, Mohd Hafis, Norhuda Hidayah Nordin, N. A. Sukindar i M. J. M. Ridzuan. "Textured Tool Surfaces for Improved Lubrication and Friction in Sheet Metal Forming". W Green Tribology, 201–22. Boca Raton: CRC Press, 2021. http://dx.doi.org/10.1201/9781003139386-9.

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Sharma, Sanjay. "Lubrication Characteristics of Newtonian-Lubricated Hydrodynamic Bearing with Partial and Fully Textured Surface". W Lecture Notes in Mechanical Engineering, 1635–43. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0550-5_158.

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He, Xia, Wenling Liao, Guorong Wang i Mengyuan Li. "Impact Evaluation Approach of a Texture Cross Section Shape on Hydrodynamic Lubrication Performance". W Advances in Mechanical Design, 1593–611. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6553-8_105.

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Rajesh, Ramesh, M. Prem Ananth, Sangam Harish, Sakthivel Balaji i R. Sivaguru. "Tribological Study on Sliding Contact Between Laser Surface Textured Titanium and Aluminium Alloy Under Lubrication". W Lecture Notes in Mechanical Engineering, 855–68. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-4488-0_72.

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He, Xia, Wenling Liao, Guorong Wang, Mengyuan Li i Jiang Shikai. "Simulation Analysis of Influences of Protrusion in Precision Machined Texture on Hydrodynamic Lubrication Performance". W Advances in Mechanical Design, 1621–34. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6553-8_107.

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Streszczenia konferencji na temat "Lubricating textured"

Sharma, Varun, i Pulak Mohan Pandey. "Study of Ultrasonic Assisted Turning of 4340 Steel With Plane and Self-Lubricating Cutting Inserts". W ASME 2016 11th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/msec2016-8565.

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The machining of intractable materials result in several problems that are required to be addressed for industry. The conventional turning of such materials is characterized by low material removal rate, which ultimately hampers the productivity. The present research work focuses on enhancing the machinability of Ultrasonic Assisted Turning (UAT) using self-lubricating cutting inserts. The formation of a thin lubricating layer combined with the aerodynamic lubrication is found to be responsible for decrease in the frictional force. A comparative study has been presented between plane and self-lubricating cutting insert over a range of cutting speed. The study of cutting force, surface roughness, shear angle and coefficient of friction demonstrate the better machining regime using textured cutting inserts during UAT. The chip analysis has been provided to indicate chip coiling due to the superimposition of ultrasonic vibration on the cutting insert.

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Hao, Xiuqing, Xiaolu Song, Liang Li i Ning He. "Tribological Properties of Textured Cemented Carbide Surfaces of Different Wettability Produced by Pulse Laser". W ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-3072.

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The micro/nano textured cemented carbide surface of different wettability was produced by laser scanning and fluorinated treatment. The tribological properties of the un-textured, oleophobic and oleophilic micro/nano textured surface were investigated experimentally including the effects of crank speed and contact pressure by a reciprocating friction and a wear tester. For all tested surfaces, the friction coefficient of the surface decreased as both the increasing crank speed and contact pressure increased. Compared to the un-textured surface, the friction coefficient of the micro/nano textured surface was significantly decreased, being sensitive to the wettability of the surface. Besides, the tribological properties of the oleophobic micro/nano textured surface were superior to the oleophilic micro/nano textured surface under the same experimental conditions. The improvement in tribological properties of the oleophobic micro/nano textured surface could be attributed to the low wettability, which was beneficial to rapid accumulation of the lubricating oil on the surface.

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Lee, Yong Hoon, Jonathon Schuh, Randy H. Ewoldt i James T. Allison. "Shape Parameterization Comparison for Full-Film Lubrication Texture Design". W ASME 2016 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/detc2016-60168.

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Minimizing energy loss and improving system load capacity and compactness are important objectives for fluid power applications. Recent studies have revealed that a micro-textured surface can reduce friction in full-film lubrication, and an asymmetric textured surface can further improve the performance by reducing friction and increasing normal force simultaneously. As an extension of these previous discoveries, we explore how enhanced texture design can maximize these objectives together. We design the surface texture using a set of distinct parameterizations, ranging from simple to complex (including very general geometries), to improve friction and normal force properties beyond what is possible for limited texture geometries. Here we use a rotational visco-rheometer configuration with a fixed bottom disc, a periodic textured surface, and a rotating top flat disc. The Reynolds equation is formulated in a cylindrical coordinate system and solved using a pseudo-spectral method to model Newtonian fluid flow within the gap between discs. Model assumptions include incompressibility, steady flow, constant viscosity, and a small gap height to texture radius ratio. Multiobjective optimization problems are solved using the epsilon-constraint method with an interior-point algorithm. The trade-off between competing objectives is quantified, revealing important insights. Arbitrary continuous texture geometries are represented using two dimensional cubic spline interpolation. Shifting to more general texture geometries resulted in significant simultaneous improvement in both performance metrics for full-film lubrication texture design. An important qualitative result is that textures resembling a helical blade tend to improve performance for rotating contacts in fluid power systems.

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Venkatesan, Sriram, i Lyndon Scott Stephens. "Surface Textures for Enhanced Lubrication: Fabrication and Characterization Techniques". W World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64291.

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In hydrodynamic lubricated thrust load bearing contacts, commonly found in mechanical seals and bearings, ‘engineered’ surface textures have the potential to enhance lubrication in terms of reduction in friction, leakage and increasing load support. These surface textures or features are in the form of micron scaled posts or cavities having arbitrarily definable geometries. The height/depth of these features is of the same order of magnitude as the film thickness of the lubricated contact. This paper presents an overview of a photolithographic process for fabricating the deterministic asperities on a ‘flat’ stainless steel surface. The textured surface is then characterized using an optical profiler to evaluate the surface form error and edge rounding error in surface texture features. It was found that the circumferential waviness of the substrate was sinusoidal with amplitude of 0.2μm. When the micro features are lapped for height control, slight rounding around the edges of the features having an average radius of about 10% of asperity length is observed.

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Panigrahi, Dillip Kumar, i Mihir Sarangi. "Fabrication of Deterministic Micro-Asperities on Thrust Surfaces Using Photo Chemical Machining". W ASME 2019 14th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/msec2019-2955.

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Abstract The present invention relates to characterization and the sequence of operations in photo chemical machining as a means to fabricate positive deterministic micro-textures on mild steel thrust pad surfaces. Fabrication of surface micro-texture by current technique is conceived in two-stages: where photographic emulsion process is used to pattern the microstructure, and chemical etching method is employed to fabricate the textures on mild steel surface by dissolving exposed metal surface. The texture fabricated by present invention is having slightly rough etched bottom surface with sharp edge and least amount of burrs around the texture rim and the process is also cost effective. Several aspects regarding sequence of operations in manufacturing process and the characterization of fabricated textured surfaces are discussed. The physical significance of micro-asperities on hydrodynamic lubrication is presented experimentally under constant flow system. The variation of hydrodynamic performance parameters such as frictional torque, fluid film thickness and recess pressure with different operating conditions such as varying speed and supply pressure are outlined.

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Ngaile, Gracious, Mark Gariety i Taylan Altan. "Enhancing Tribological Conditions in Tube Hydroforming by Using Textured Tubes". W ASME/STLE 2004 International Joint Tribology Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/trib2004-64020.

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The effects of textured tubes on the tribological performance in Tube Hydroforming (THF) are discussed. Textured surfaces, namely sand blasted, knurled, and as rolled surfaces were tested under various interface pressure and sliding velocity conditions. Sand blasted textured tubes were found to have the best tribological performance. It was also found that the interface pressure has a great influence on the attainment of Micro-Plasto HydroDynamic Lubrication (MPHDL) and Micro-Plasto HydroStatic Lubrication (MPHSL) conditions at the tool-workpiece interface. Preliminary finite element simulations on the deformation behavior of tube surface shows that surface textures can be optimized to enhance tribological performance.

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Qiu, Mingfeng, Brian Bailey, Rob Stoll i Bart Raeymaekers. "The Validity of the Compressible Reynolds Equation for Gas Lubricated Textured Parallel Slider Bearings". W ASME/STLE 2012 International Joint Tribology Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ijtc2012-61051.

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The Navier-Stokes and compressible Reynolds equations are solved for gas lubricated textured parallel slider bearings under hydrodynamic lubrication for a range of realistic texture geometry parameters and operating conditions. The simplifying assumptions inherent in the Reynolds equation are validated by comparing simulation results to the solution of the Navier-Stokes equations. Using the Reynolds equation to describe shear driven gas flow in textured parallel slider bearings is justified for the range of parameters considered.

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Fang, Hsu-Wei, i Yu-Chih Su. "Effects of Biological Lubrication on the Morphology of UHMWPE Wear Particles Generated With Surface Textures". W World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63501.

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Osteolysis induced by ultra-high molecular weight polyethylene (UHMWPE) wear particles has emerged as a critical failure mechanism of artificial joints. Many researchers have performed cell culture studies or animal tests to investigate the UHMWPE particles induced immunological responses. However, the effect of size and shape remains elusive. This is partly because of the difficulty in obtaining UHMWPE wear particles with specific sizes and shapes for bioactivity tests. Previously, we have shown the feasibility of producing narrowly distributed UHMWPE particle sizes and shapes by rubbing UHMWPE pins against textured surfaces [1]. The correlations between the surface texture dimensions and the size and shape of wear particles generated in water have been obtained [2]. In addition, this novel technique of UHMWPE particle generation enables the investigation of the effects of UHMWPE particle size and shape on bioactivity. It is concluded that the elongated particles and the particles which can be engulfed by macrophage cells induced stronger immunological responses [3]. Thus, it is possible to enhance the life of total joint replacements by reducing the production of the most toxic particle populations in terms of size and shape. Our idea is to apply surface textures on the articulating surface of joint implant in order to control the size and shape of UHMWPE wear particles. While maintaining a low wear rate of UHMWPE parts, further reduction of the most “toxic” particles released into human body shall prevent particle-induced osteolysis.

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Tock, Andrew, Rahul Gandhi, Christopher Saldana i Patricia Iglesias. "Wear Performance of New Textured Surfaces Created by Modulation Machining". W ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-70721.

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Methods for scalable surface texturing continues to receive significant attention due to the importance of micro-textured surfaces toward improving friction, wear and lubrication ability of mechanical devices. Controlled textures on surfaces act as fluid reservoirs and receptacles for debris and wear particles, reducing friction and wear of mating components. There are numerous fabrication techniques that can be used to create micro-sized depressions on surfaces, but each has limitations in terms of control and scalability. In the present study, modulation-assisted machining (MAM) is demonstrated as a viable approach to produce such textures, offering a potentially cost-effective approach for scalable production of these features on component surfaces. In this work, the wear behavior of several textured surfaces created by MAM was studied using a ball-on-flat reciprocating tribometer. Textured and untextured alloy 360 brass disks were mated with stainless steel AISI 440C balls under lubricated conditions and variable sliding distance. The textured surfaces exhibited noticeably reduced wear under the longer sliding distances and the tribological performance of the surfaces depended on the size of the micro-dimples. Wear mechanisms are elucidated from the optical microscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) observations and the implications for using such surfaces in practice are briefly discussed.

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Mazzonetto, M. "Surface micro – texturing of tapping tools with complex geometry". W Italian Manufacturing Association Conference. Materials Research Forum LLC, 2023. http://dx.doi.org/10.21741/9781644902714-43.

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Abstract. Lubrication control and tribological aspects affect all the machining operations: minimizing the friction coefficient, reducing the heat generated during machining or decreasing stresses during cutting operations are just some sought goals during machining. A fundamental aspect is also related to the drop of the amount of cutting fluid required during manufacturing processes. In fact, this can respond to issues related to the process sustainability thus allowing machining under MQL (Minimum Quantity Lubrication) conditions. The aim of this work is to propose an effective methodological procedure to texture cutting tools with complex geometry. A picosecond laser system operating at infrared frequency was used to structure the whole cutting tool surface. Rectangular dimples were selected as texture pattern to ensure the evaluation of the dimensions achieved by the dimples. Textured surfaces topography will allow the evaluation of the effectiveness of the developed process.

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