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Journal articles on the topic 'Hydrodynamic lubrication mode'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Албагачиев, Али, Ali Albagachiev, Владимир Данилов, and Vladimir Danilov. "MAGNETIC LIQUID IN HYDRODYNAMIC LUBRICATION MODE OF SPHERICAL SURFACES." Bulletin of Bryansk state technical university 2016, no. 3 (2016): 90–93. http://dx.doi.org/10.12737/22017.

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From the position of the hydrodynamic lubrication theory are considered the peculiarities of magnetoliquid lubrication in a point contact determined with a complicated character of the interaction of hydrodynamic and magnetic forces in a lubrication layer. The pressure distribution in a lubrication layer of magnetic liquid is considered as a superposition of the augend and addend pr and pm induced with hydrodynamic and magnetic forces. The contribution of the constituent pr is described by Reynolds equation in accordance with the classic hydrodynamic theory. At the saturation of magnetic liqui

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2

Mikosianchyk, O., O. Yakobchuk, R. Mnatsakanov, and A. Khimko. "Evaluation of operational properties of aviation oils by tribological parameters." Problems of tribology 99, no. 1 (2021): 43–50. http://dx.doi.org/10.31891/2079-1372-2021-99-1-43-50.

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The quality of aviation oils was evaluated online on the basis of their lubricating, antifriction, rheological and antiwear properties in the friction contact. The use of the software and hardware complex for evaluation of operational characteristics of triboelements is offered. Approbation of the proposed methodology was performed on aviation oils SM-9. The increase in antifriction properties of the “Bora B” SM-9 oil was established to be due to the formation of limiting adsorption layers of lubricant on friction-activated contact surfaces, which are characterized by low shear stresses of the

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AKHVERDIEV, K. S., E. A. BOLGOVA, E. O. LAGUNOVA, and S. V. KUMANIN. "HYDRODYNAMIC CALCULATION OF A WEDGE-SHAPED SYSTEM «SLIDER – GUIDE» OPERATING ON A COMPRESSIBLE LUBRICANT IN THE PRESENCE OF MELT ON THE SURFACE OF THE GUIDE." Fundamental and Applied Problems of Engineering and Technology 2 (2021): 109–17. http://dx.doi.org/10.33979/2073-7408-2021-346-2-109-117.

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Recently, various methods have been used to ensure the hydrodynamic mode of lubrication, one of the methods is devoted to this scientific article. In the article, on the basis of the equation of motion of a compressible, truly viscous liquid for a "thin layer", the equations of state, the continuity equation, as well as the equations describing the profile of the molten contour of the surface of the support ring, an asymptotic and self-similar solution is found for the zero (without taking into account the melt) and the first (taking into account the melt) approximation, for determining the ve

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Milanenko, O., and A. Bobro. "Multifactorial criterion evaluation of lubrication efficiency and wear resistance of friction units operating under extreme operating conditions." Problems of Tribology 30, no. 2/116 (2025): 6–13. https://doi.org/10.31891/2079-1372-2025-116-2-6-13.

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A new multifactor criterial approach to modifying lubricants by rheological properties and chemical composition is proposed in order to increase the lubricating ability of modified layers and wear resistance of friction units from the position of mixed lubrication conditions. Prevention of micro-EНD lubricating layer is achieved by a set of measures: implementation of stable micro-EHD lubrication by the criterion of lubrication mode; optimal viscosity class with an increase in the fraction of hydrodynamic pressure of modified layers relative to the contact pressure from micro-unevenness of rou

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Kaneko, Satoru, Hiroyuki Takabatake, and Kanya Ito. "Numerical Analysis of Static Characteristics at Start of Operation in Porous Journal Bearings With Sealed Ends." Journal of Tribology 121, no. 1 (1999): 62–68. http://dx.doi.org/10.1115/1.2833812.

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Static characteristics at the start of the operation are theoretically investigated in a porous journal bearing with sealed ends lubricated only by the oil initially provided within its pores. This is a preliminary study for estimating the variation of these characteristics with running time. A simple analytical model of the mixed lubrication regime is proposed on the basis of the assumption that the external forces acting on the journal, i.e., the applied static load, the oil-film force and the force at the boundary friction part, are balanced. Numerical results show that air penetrates into

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6

Tichy, J. "Rheological Behavior of Confined Fluids in Thin Lubricated Contacts." Journal of Applied Mechanics 68, no. 2 (1999): 278–83. http://dx.doi.org/10.1115/1.1354204.

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Continuum based methods are traditionally thought to be of little value in describing boundary lubrication, or the mode of lubrication in molecular scale films that may occur at asperity interactions during the sliding of nominally flat surfaces. There is considerable experimental evidence, which suggests that the classical theory may be valid with modification to films as thin as several nanometers. In addition, lubricants, which exhibit viscous liquid properties in bulk, may form attached solid-like elastic layers when confined between solid surfaces. In the present paper, the simple “elasti

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Леванов, Игорь, Igor Levanov, Елена Задорожная, Elena Zadorozhnaya, Артём Дудников, and Artem Dudnikov. "METHODOLOGY IN DEFINITION OF CONROD BEARINGS LIFE OF HEAT-ENGINE." Bulletin of Bryansk state technical university 2016, no. 3 (2016): 46–57. http://dx.doi.org/10.12737/22168.

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The paper reports the sequence of the definition of bearings resource in a crank gear of heatengines. A brief description is given regarding the procedure for the computation of bearing hydromechanical properties in terms of hydrodynamic theory of lubrication and that of the procedure for the definition of an area of contact interaction. The input equations for the computation of dynamics and lubrication are: the equation for the field of hydrodynamic pressures in a lubrication layer separating random loaded surfaces (Reynolds equation); the equations set of plane motion of a shaft journal cen

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Korchagina, M. V., V. N. Stepanov, S. O. Kireev, and A. R. Lebedev. "Investigation of Parameters Influencing the Establishment of Hydrostatic Mode in the Crosshead-Guide Assembly of High-Pressure Plunger Pump." Advanced Engineering Research (Rostov-on-Don) 24, no. 4 (2024): 316–27. https://doi.org/10.23947/2687-1653-2024-24-4-316-327.

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Introduction. When applying hydraulic fracturing technology to increase the efficiency of formation fluids, high-pressure pumps with a crosshead drive assembly are used. The major problem in the operation of these pumps is the wear of the crosshead guides. The crosshead is a flat sliding friction pair, leading to wear of the plunger seals and a decrease in the basic pump performance indicators. To solve this problem, it was previously proposed to use new materials and antifriction coatings, original designs of friction units, etc. However, a detailed description and solution to the problem und

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9

Wang, Yan Qing, Hai Feng Yang, Qing Gong Han, Liang Fang, and Shi Rong Ge. "Tribological and Lubrication Properties of Sandblast-Textured Surfaces with Varied Roughness." Advanced Materials Research 154-155 (October 2010): 1019–22. http://dx.doi.org/10.4028/www.scientific.net/amr.154-155.1019.

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Surface roughening, with certain roughness topography, is thought to be as an effective tribological method of decreasing friction coefficient of kinematic pairs. Friction and wear of AISI1045 steel surface roughened by convenient and economical way of sandblasting was investigated under lubrication conditions. Roughened and polished samples run against Φ4mm GCr15 pin lubricated by engine oil were tested in reciprocating mode with different load and speed on UMT- testing machine. It is found that there exists the optima surface roughness (Ra is about 3.92μm) roughened by sandblasting in which

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10

Oh, Kong Ping. "The Formulation of the Mixed Lubrication Problem as a Generalized Nonlinear Complementarity Problem." Journal of Tribology 108, no. 4 (1986): 598–603. http://dx.doi.org/10.1115/1.3261274.

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The mixed-lubrication problem is formulated as a nonlinear generalized complementarity problem in which the pressure acting on the load-bearing surface is taken as the unknown, and the lubricant flow and the gap between the surfaces are taken as its complements. An iterative method was developed to find the solution, which satisfies the complementarity condition that at each point on the load-bearing surface, the pressure or at least one of its complements, is zero at all times. Moreover, the pressure and its complements satisfy non-negativity constraints. The solution intrinsically decomposes

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Ilina, O. A., O. O. Mikosianchyk, O. P. Yashchuk, R. H. Mnatsakanov, and N. M. Berezivskyi. "Tribomonitoring of the quality of aviation hydraulic oils according to lubricity and rheological indicators." Problems of Tribology 28, no. 1/107 (2023): 34–40. http://dx.doi.org/10.31891/2079-1372-2023-107-1-34-40.

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The study proposes a diagnostic control method for assessing the quality of commercial batches of hydraulic oils based on the kinetics of changes in the thickness of lubricating layers, shear stresses of the lubricating material, and effective viscosity in tribotechnical contact. Timely and high-quality tribomonitoring of lubricants provides a perspective on their rational use and reduced wear of equipment parts. The developed methodology simulates the operation of gears in rolling conditions with a slip of 30% using a roller analogy. Samples of AMG-10 oil from two manufacturers were analyzed.

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Hou, Ya Li, and Chang He Li. "Numerical Simulation of Hydrodynamic Fluid Pressure in Grinding Zone with Resin-Bonded Diamond Grinding Wheel." Key Engineering Materials 426-427 (January 2010): 668–73. http://dx.doi.org/10.4028/www.scientific.net/kem.426-427.668.

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In the grinding process, grinding fluid is delivered for the purposes of chip flushing, cooling, lubrication and chemical protection of work surface. Lubrication and cooling are the most important roles provided by a grinding fluid. Hence, the conventional method of flood delivering coolant fluid by a nozzle in order to achieve high process performance purposivelly. However, hydrodynamic fluid pressure can be generated ahead of the grinding zone due to the wedge effect between wheel peripheral surface and part surface. In the paper, a theoretical hydrodynamic pressure modeling is presented for

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Chen, Juan, Jie Zhou, Binbin Ji, Liangcai Zeng, Yang Mao, and Jun Wei. "Experimental Investigation of Lubrication Performance of Rhombic-Textured TiN-Coated Surfaces Under Lubricated Conditions." Coatings 15, no. 5 (2025): 594. https://doi.org/10.3390/coatings15050594.

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Surface texture and titanium nitride (TiN) coating have been established as effective methods for enhancing the tribological properties of mechanical friction pairs. This work aims to investigate the lubrication performance of rhombic-textured TiN-coated surfaces under oil-lubricated conditions using a pin-on-disk test mode. A total of 17 sets of samples were designed, including a control sample (with no rhombic texture and no TiN coating), a TiN-coated sample and rhombic-textured TiN-coated samples. The rhombic surface texture was fabricated using the end surface of a brass bar. TiN coating d

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14

Ouyang, Wu, Bin Wang, and Jian Huang. "Regional Characteristics and Control Method of the Mixing Flow Pattern for Water-Lubricated Tilting Pad Thrust Bearings." Applied Sciences 12, no. 14 (2022): 6999. http://dx.doi.org/10.3390/app12146999.

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The water-lubricated tilting pad thrust bearings (WTTBs) of the reactor coolant main pump and high-power RDT operate at a large linear velocity, heavy load, and low viscosity. On the basis of the performance prediction of WTTBs in the mixing flow pattern, a hypothesis of the regional flow pattern is proposed. To compare the lubrication performance under four kinds of flow pattern modes, a thermo-elasto-hydrodynamic lubrication model of the WTTB considering the flow pattern is established, and a partition iteration algorithm for the mixing flow pattern is provided. Moreover, a method for contro

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Yin, Bifeng, Bo Xu, Hekun Jia, Huiqin Zhou, Yonghong Fu, and Xijun Hua. "Effects of the array modes of laser-textured micro-dimples on the tribological performance of cylinder liner–piston ring." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 232, no. 7 (2017): 871–81. http://dx.doi.org/10.1177/1350650117732718.

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A mixed lubrication model of textured cylinder liner–piston ring was built to investigate the effects of four array modes namely, square array, stagger array, stretching, and shortening along liner axis array of micro-dimples on the tribological properties of cylinder liner–piston ring pair. The simulation results indicate that micro-dimples can enhance the hydrodynamic effects of lube oil, improving the film bearing capability. However, the effects differ significantly under the four dimple array modes: for square array, the cylinder liner–piston ring pair is well lubricated due to the synerg

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16

Yu, Zhaosheng, Yutian Yang, and Jianzhong Lin. "Lubrication Force Saturation Matters for the Critical Separation Size of the Non-Colloidal Spherical Particle in the Deterministic Lateral Displacement Device." Applied Sciences 12, no. 5 (2022): 2733. http://dx.doi.org/10.3390/app12052733.

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Deterministic lateral displacement (DLD) is a popular technique for separating micro-scale and nano-scale particles continuously. In this paper, an efficient three-dimensional fictitious domain method is developed for the direct numerical simulation of the motion of a non-colloidal spherical particle in the DLD device (i.e., cylinder array), based on substantial modification of our previous FD method. A combination of the fast Fourier transformation (FFT) and a tri-diagonal solver is developed to efficiently solve the pressure Poisson equation for a DLD unit with a shifted periodic boundary co

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Chen, Zhi Lan, and Jun Zhu. "Comparison with Thermo Hydrodynamic Lubrication between 2D and 3D Model in Thrust Bearing by Computing Simulation." Advanced Materials Research 129-131 (August 2010): 1336–40. http://dx.doi.org/10.4028/www.scientific.net/amr.129-131.1336.

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As the interface problem of discontinuity boundary condition between the oil film and the pad in thrust bearing, a conjugated solution method by using the temperature continuity and the heat flux continue is proposed. The three-dimensional calculated model of thrust bearing is constructed and solved by using finite difference method. Comparing with 2D model, the characteristics of the lubrication performance of 3D model are more different. The results show that the three-dimensional calculated model not only revealed the relation of temperature variation between the oil film layer and the pad

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18

Qin, Zhaoju, Chenheng Yuan, Yanpeng Yuan, and Yuanyuan Huang. "Tribological characteristics of piston rings in a single-piston hydraulic free-piston engine." Industrial Lubrication and Tribology 69, no. 2 (2017): 131–41. http://dx.doi.org/10.1108/ilt-01-2015-0011.

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Purpose A free-piston engine (FPE) is an unconventional engine that abandons the crank system. This paper aims to focus on a numerical simulation for the lubricating characteristics of piston rings in a single-piston hydraulic free-piston engine (HFPE). Design/methodology/approach A time-based numerical simulation program was built using Matlab to define the piston motion of the new engine. And a lubrication mode of piston rings was built which is based on the gas flow equation, hydrodynamic lubrication equation and the asperity contact equation. The piston motion and the lubrication model are

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EROKHIN, MIKHAIL N. "USE OF THE SELECTIVE TRANSFER MECHANISM IN MOVABLE COUPLINGS USED IN POWER TRANSMISSIONS OF AGRICULTURAL MACHINES." Agricultural engineering, no. 2 (2022): 52–58. http://dx.doi.org/10.26897/2687-1149-2022-2-52-58.

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Searching for new effective ways of increasing the wear resistance of power transmissions and improving their durability, the authors propose a device for enriching the lubrication system of power transmissions with copper-alloying elements. The tribochemical processes have been studied and the components of the lubricating composition have been selected to provide for the self-organized selective transfer in the “steel-steel” friction couples accompanied by the formation of a servovit film. The authors developed a utility model for enriching the lubricating system oil with copper-alloying ele

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EROKHIN, MIKHAIL N. "USE OF THE SELECTIVE TRANSFER MECHANISM IN MOVABLE COUPLINGS USED IN POWER TRANSMISSIONS OF AGRICULTURAL MACHINES." Agricultural engineering, no. 2 (2022): 52–58. http://dx.doi.org/10.26897/2687-1149-2022-2-52-58.

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Searching for new effective ways of increasing the wear resistance of power transmissions and improving their durability, the authors propose a device for enriching the lubrication system of power transmissions with copper-alloying elements. The tribochemical processes have been studied and the components of the lubricating composition have been selected to provide for the self-organized selective transfer in the “steel-steel” friction couples accompanied by the formation of a servovit film. The authors developed a utility model for enriching the lubricating system oil with copper-alloying ele

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21

Wei, Lidui, Haijun Wei, Shulin Duan, and Yu Zhang. "An EHD-mixed lubrication analysis of main bearings for diesel engine based on coupling between flexible whole engine block and crankshaft." Industrial Lubrication and Tribology 67, no. 2 (2015): 150–58. http://dx.doi.org/10.1108/ilt-08-2013-0088.

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Purpose – The purpose of this paper is to develop a good calculation model to accurately predict the lubrication characteristic of main bearings of diesel engine and improve the service life. Design/methodology/approach – Based on the coupling of the whole flexible engine block and the flexible crankshaft reduced by the Component Mode Synthesis (CMS) method, considering mass-conserving boundary conditions, the average flow model equation and Greenwood/Tripp asperity contact theory, an elastohydrodynamic (EHD)-mixed lubrication model of the main bearings for the diesel engine is developed and r

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Задорожная, Елена, Elena Zadorozhnaya, Игорь Мухортов, Igor Mukhortov, Ксения Почкайло, and Kseniya Pochkaylo. "Anti-wear additives influence upon hydrodynamic friction mode parameters in bearings of internal-combustion engines." Bulletin of Bryansk state technical university 2016, no. 3 (2016): 29–36. http://dx.doi.org/10.12737/22007.

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An essential condition to ensure an engine life having 300,000 – 1 000,000 km according to race consists in assurance of a minimum wear rate of crankshaft bearings. For such units as connectingrod bearings a maximum allowable value of bearing brass wear makes 100 mkm which corresponds to an integral linear wear intensity of 10-14 …10-13 that is possible only at a hydrodynamic mode of friction actually at all modes of engines operations. Ensuring liquid friction in all range of contact pressures is achieved both through design methods, and technological ones. To the latter belongs first of all

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Chanchikov, Vasiliy Aleksandrovich, Ivan Nikolaevich Guzhvenko, Nina Vladimirovna Pryamuhina, Mariya Sergeevna Pryamukhina, Elena Prokofievna Karlina, and Vladimir Grigorievich Bukin. "The research of a tribotechnical efficiency of modified lubricants in crankshaft sliding bearings of a marine diesel engine." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2024, no. 4 (2024): 65–74. https://doi.org/10.24143/2073-1574-2024-4-65-74.

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The conditions of friction and lubrication of sliding bearings in a marine diesel engine are considered. In conditions of transient conditions, heavy loads or contamination of the lubricant used in bearings of marine diesel engines, the lubricating film becomes quite thin with a thickness in the range of 0.25-2.5 microns, and the local pressure is large enough – about 15-20 MPa. At the same time, for the operation of sliding bearings in hydrodynamic mode, the minimum pressure in the lubrication system is P = 0.05 MPa, otherwise, a zone of boundary friction is formed between the neck of the cra

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Akhverdiev, K. S., E. A. Bolgovа, E. O. Lagunova, and S. V. Kumanin. "Hydrodynamic calculation of wedge-shaped system «slider-guide» operating on compressible lubricant in presence of melt on surface of guide." Omsk Scientific Bulletin, no. 176 (2021): 10–14. http://dx.doi.org/10.25206/1813-8225-2021-176-10-14.

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In the article on the basis of the equation of motion of the compressible lubricant for the «thin layer», continuity, state, and the equation describing the profile of the molten contour taking into account the formula of mechanical energy dissipation the asymptotic and self-similar solution is found for the extreme (when the speed tends to infinity) and non-extreme case. As a result of solving the problem, a refined mathematical calculation model of a wedgeshaped sliding support with a low-melting metal coating on a movable contact surface is obtained, which compensates for an emergency lack

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Kirishchieva, Victoria, and Murman Mukutadze. "INCREASING THE WEAR RESISTANCE OF RADIAL BEARINGS WITH NON-CIRCULAR PROFILE AND COMPOSITE FLUOROPLASTIC POLYMER COATING." Transport engineering 2022, no. 11 (2022): 10–17. http://dx.doi.org/10.30987/2782-5957-2022-11-10-17.

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The study objective is to find out the regularities of a stable hydrodynamic regime. The paper is devoted to the analysis of a model of a radial sliding bearing with a profile adapted to friction conditions, which also has a polymer coating with a groove on the support. Research methods: there are proposed new models describing the movement of the lubricant in the approximation of a "thin layer", the continuity equation taking into account the dependence of viscosity on pressure. The novelty of the work is in the development of a methodology for engineering calculations of th

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Putintsev, Sergey V., Sergey A. Anikin, Sofia P. Demenkova, and Sofya S. Strelnikova. "Calculation of the required minimum of a motor oil level on cylinder-piston group moving surfaces of the automotive diesel." Traktory i sel hozmashiny 89, no. 1 (2022): 53–65. http://dx.doi.org/10.17816/0321-4443-100063.

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BACKGROUND: Theme of this article is actual because issues of the reliable and cost-effective opera-tion of augmented automotive piston engines are still not solved. An important aspect of solving the problem is rational oil supply of the cylinder-piston group. AIMS: The purpose of this work is the required minimum motor oil level estimation for the hydrodynamic lubrication of the cylinder-piston skirt pair. There were set and solved the tasks of determining the volume of motor oil capable of filling: 1) cavities of the flat-topped surface of the cylinder; 2) a raised surface of the pist

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Vasilenko, V. V., V. I. Kirishchieva, M. A. Mukutadze, and V. E. Shvedova. "Investigation of the Wear Resistance of a Journal Bearing with Polymer-Coated Grooved Support Ring." Advanced Engineering Research 22, no. 4 (2023): 365–72. http://dx.doi.org/10.23947/2687-1653-2022-22-4-365-372.

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Introduction. In modern heavy-loaded friction units, metallopolymer coated bearings operating in the boundary friction mode are widely used. Their successful application is provided by the viscoelastic deformation of these coatings under load. To pass from boundary friction to liquid friction, it is required to create a bearing hydrodynamic wedge. Currently, the use of journal bearings with polymer-coated grooved support ring is hindered by the lack of a methodology for their calculation. This work analyzes a model of movement of a micropolar lubricant in the operating clearance of a journalbe

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Andreeva, O. B., V. I. Kirishcheva, and M. A. Mukutadze. "Increasing the Wear Resistance of a Polymer-Coated Radial Bearing Running on a Micropolar Lubricant." Vestnik IzhGTU imeni M.T. Kalashnikova 25, no. 3 (2022): 23–31. http://dx.doi.org/10.22213/2413-1172-2022-3-23-31.

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The article is devoted to the analysis of a mathematical model of a lubricant mootion in the working gap of a radial sliding bearing with a support profile having a fluoroplast-containing composite polymer coating with a groove on the support surface, which has micro-polar properties. New mathematical models describing the motion of the bearing material in the working gap of a radial bearing with a support profile having a polymer coating with a groove, which has micropolar rheological properties in the laminar mode of motion, in the approximation for a “thin layer”, are proposed. A comparativ

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Pradeep, Shravan, Alan Wessel, and Lilian C. Hsiao. "Hydrodynamic origin for the suspension viscoelasticity of rough colloids." Journal of Rheology 66, no. 5 (2022): 895–906. http://dx.doi.org/10.1122/8.0000424.

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We report the linear rheology for dense suspensions of sterically stabilized smooth and mesoscopically rough colloids interacting as hard particles. Small amplitude oscillatory measurements reveal that rough colloids at high volume fractions exhibit storage and loss moduli that are orders of magnitude greater than smooth colloids. Frequency-concentration superposition is used to collapse the viscoelasticity data onto a master curve, where shift factors suggest a more elastic microstructure and reduced cage volume for rough particles. A combination of the mode-coupling theory, hydrodynamic mode

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Yamashita, Minoru, Toshio Hattori, and Koji Kuwahara. "Circular Cup Drawing of Magnesium Alloy Sheet under Cold Condition Using Rubber Tool and Improvement of Surface Appearance." Materials Science Forum 773-774 (November 2013): 646–52. http://dx.doi.org/10.4028/www.scientific.net/msf.773-774.646.

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In order to accomplish the circular cup drawing of the sheet material whose ductility is extremely poor under the cold forming condition, the Maslennikov's technique was applied. A deformable rubber ring was used instead of the hard punch. Test material was magnesium alloy AZ31-O sheet. Small die profile radius was applied, which was twice or 4 times of the sheet thickness. A semisolid lubricant was used for the lubrication of the blank - die interface, on the other hand, the rubber - blank interface was degreased to increase friction. The limiting drawing ratio of 1.31 was attained. A peculia

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Kireev, Sergey, Valentin Stepanov, and Marina Korchagina. "Study of crosshead-guided lubrication systems for hydraulic fracturing plunger pumps." E3S Web of Conferences 592 (2024): 05010. http://dx.doi.org/10.1051/e3sconf/202459205010.

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Efficient extraction of hard-to-recover hydrocarbon reserves requires impressive expenditures on the use of advanced technologies and energy-intensive equipment. Hydraulic fracturing technologies require the use of high-pressure pumps (105 and 138 MPa), and this determines the use of plunger pumps in these conditions. To relieve the radial load on the plunger seals, a crosshead layout of the drive part is used. The goal is to investigate crosshead (guide) load distribution throughout the crankcase and also the oil distribution in the crosshead-guide gap to find the most efficient design. The m

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Liang, Wen Hong, Kai Liu, Xiao Lin Liu, and Ya Hui Cui. "Research on Influence of Intertooth Space Confriction to Transmission Efficiency under EHL." Advanced Materials Research 605-607 (December 2012): 1158–63. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.1158.

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Engagement between gear teeth with confriction has been analyzed aim at low speed and heavy transmission mode of spur gear in aerogenerator gearbox. Nonlinear relation between parameters such as confriction, normal pressure, number of teeth, ratio of transmission, and thickness of fluid film has been deduced by using the theory of elasto-hydrodynamic lubrication (EHL) and gear mesh. Numerical calculation of these equations has been made progress by using MATLAB software under the premise of no analytical solution. The efficiency of each point on line of action has been received. And then the i

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Tian, Dong, Yanjun Feng, Hongbo Su, et al. "Research on the Accumulative Damage of Flywheels Due to In-Space Charging Effects." Aerospace 12, no. 2 (2025): 98. https://doi.org/10.3390/aerospace12020098.

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High-speed rotating flywheel bearings, designed for space applications, generate a high-resistance hydrodynamic lubrication film, which isolates the rotor, transforming it into a conductor. This phenomenon introduces a novel failure mode—flywheel bearing electrical damage caused by space charging effects. This paper first reviews the sources of common shaft voltages in flywheels and the mechanisms of electrical damage and improves the principle of deep charge causing shaft voltages in flywheel bearings, proposing that surface charge is another source of shaft voltages. The quantified analysis

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Nicoletti, Rodrigo, and Ilmar Ferreira Santos. "Frequency Response Analysis of an Actively Lubricated Rotor/Tilting-Pad Bearing System." Journal of Engineering for Gas Turbines and Power 127, no. 3 (2005): 638–45. http://dx.doi.org/10.1115/1.1850940.

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In the present paper, the dynamic response of a rotor supported by an active lubricated tilting-pad bearing is investigated in the frequency domain. The theoretical part of the investigation is based on a mathematical model obtained by means of rigid body dynamics. The oil film forces are inserted into the model by using two different approaches: (a) linearized active oil film forces and the assumption that the hydrodynamic forces and the active hydraulic forces can be decoupled, and (b) equivalent dynamic coefficients of the active oil film and the solution of the modified Reynolds equation f

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35

Wang, Xiaolei, Koji Kato, Koshi Adachi, and Kohji Aizawa. "The effect of laser texturing of SiC surface on the critical load for the transition of water lubrication mode from hydrodynamic to mixed." Tribology International 34, no. 10 (2001): 703–11. http://dx.doi.org/10.1016/s0301-679x(01)00063-9.

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36

Stelmakh, Oleksandr, Hongyu Fu, Yiqiao Guo, Xinbo Wang, Hao Zhang, and Oleksandr Dykha. "Adhesion-Deformation-Hydrodynamic model of friction and wear." Problems of Tribology 27, no. 3/105 (2022): 49–54. http://dx.doi.org/10.31891/2079-1372-2022-105-3-49-54.

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The proposed Adhesion-Deformation-Hydrodynamic model of friction and wear is based on the relationship of elastic-deformation processes in the surfaces of curvilinear contacts with hydrodynamic regular processes of extrusion and rarefaction in lubricating layers in tribocontacts, as well as with the processes of primary adhesion of friction surfaces and subsequent acts of adhesive wear. The proposed Adhesion-Deformation-Hydrodynamic model of friction and wear and its main provisions on the relationship between extrusion, rarefaction in lubricating layers and primary adhesion of friction surfac

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37

Czaban, Adam, and Andrzej Miszczak. "Influence of Pressure Changes on the Viscosity of Lubricating Oil in CFD Simulations of Conical Bearing Hydrodynamic Lubrication." Journal of KONBiN 52, no. 3 (2022): 259–78. http://dx.doi.org/10.2478/jok-2022-0036.

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Abstract The aim of this study is to consider the effect of pressure on the viscosity of lubricating oil in the adopted model of hydrodynamic lubrication and on the calculated flow parameters and operating parameters of a conical slide bearing. The numerical analysis consisted in solving the Reynolds type equation for the process of stationary hydrodynamic lubrication.

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38

Bolgova, E. A., M. A. Mukutadze, and V. M. Prihod'ko. "Modified Radial Bearing Wear Resistance Assessment with Respect to Compressibility." Vestnik IzhGTU imeni M.T. Kalashnikova 27, no. 4 (2024): 14–21. https://doi.org/10.22213/2413-1172-2024-4-14-21.

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Polymer composite materials in the form of antifriction coatings arewidely used nowadays in heavily loaded low-speed tribosystems of various machines, providing significant resources for friction units. The use of liquid lubricants makes it possible to expand the speed range of their applicability since it provides a transition from self-lubrication boundary friction to liquid friction under hydrodynamic conditions. Then, coatings will be active during starts and runouts, and lubricant will work during stationary mode. Liquid lubricant moving in the working gap inevitably contains atmospheric

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Ilina, O. A., O. O. Mikosianchyk, R. H. Mnatsakanov, R. E. Kostyunik, O. P. Yashchuk, and M. A. Shteinyk. "Mechanisms of formation of wear-resistant dissipative structures in non-stationary lubrication conditions." Problems of Tribology 28, no. 3/109 (2023): 49–55. http://dx.doi.org/10.31891/2079-1372-2023-109-3-49-55.

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The work aimed to determine the influence of the processes of supramolecular self-organization in the lubricating layer on the patterns of wear of friction pairs. The mechanisms of structural adaptability of tribocoupler elements were analyzed, and the regularities of the manifestation of a large-scale and energy jump, which characterizes the transition of the tribosystem to a metastable state, were determined. An evaluation of the tribotechnical characteristics of commercial transmission oils was carried out on a software-hardware complex that, using a roller analogy, simulates the operation

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Burstein, Leonid. "Surfaces with pores: hydrodynamic lubrication." Industrial Lubrication and Tribology 69, no. 4 (2017): 471–83. http://dx.doi.org/10.1108/ilt-05-2016-0108.

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Purpose This paper aims to assess the hydrodynamic lubrication of two opposing surfaces with identical pores having a semicircular profile. The surfaces are treated with more than one pore that allows clarification of whether there exists interaction between the pores. Design/methodology/approach A transient, spatial, one-dimensional model of surfaces with regular pores was developed and applied in the context of fluid lubrication. MATLAB software has been used. Findings Calculations show that a lubricating film between two surfaces with pores provides better hydrodynamic conditions in compari

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Pasco, Corentin, Muhammad Khan, Jaipal Gupta, and Kenneth Kendall. "Experimental investigation on interply friction properties of thermoset prepreg systems." Journal of Composite Materials 53, no. 2 (2018): 227–43. http://dx.doi.org/10.1177/0021998318781706.

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A comprehensive novel investigation into the characterisation of interply friction behaviour of thermoset prepregs for high-volume manufacturing was conducted. High interply slipping rate and normal pressure typically used for high-volume manufacturing present challenges when preforming carbon fibre reinforced plastics. The study involved multiple reinforcement architectures (woven and unidirectional with the same rapid-cure resin system) which were characterised using a bespoke interply friction test rig used to simulate processing conditions representative to press forming and double diaphra

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Xiang, Chang Zheng, Yu Juan Wang, and Yun Fei Chen. "Hydrodynamic Lubrication in a Nanoscale Bearing." Advanced Materials Research 60-61 (January 2009): 1–5. http://dx.doi.org/10.4028/www.scientific.net/amr.60-61.1.

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Nonequilibrium molecular dynamics simulation is used to simulate the hydrodynamics lubrication in the nanoscale bearing. A physical model of the nanascale bearing that the thin liquid water film confined between two solid walls has been set up. The simulation results indicate that the hydrodynamic pressure profiles as the macroscopic state are formed in nanoscale bearings. The hydrodynamic pressure increases with increasing shear velocity, and corresponding load capacity also increases with increasing sliding velocity of the upper driven wall. These results are in accordance with classical Rey

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Engao, Peng, Xiong Zhihong, Luo Zhenkun, Zhang Yongyang, and Yin Zhansong. "Analysis on Lubrication Performance of Piston Ring-Cylinder Liner based on Numerical Simulation." Journal of Physics: Conference Series 2510, no. 1 (2023): 012017. http://dx.doi.org/10.1088/1742-6596/2510/1/012017.

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Abstract This paper mainly studies the tribological performance of friction pairs and poor lubrication during piston movement. Based on the average Reynolds equation and comprehensively considering the variable viscosity and variable density characteristics of lubricating oil, a transient hydrodynamic lubrication model of the piston ring-cylinder liner friction pair is established. By solving the established lubrication model, the lubricating oil film thickness value, friction value and other parameters that can characterize the lubrication performance of the friction pair throughout the cycle

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Dykha, O., O. Babak, O. Makovkin, and S. Posonskiy. "Tribological properties of anode-spark coatings on aluminum alloys." Problems of Tribology 27, no. 2/104 (2022): 28–34. http://dx.doi.org/10.31891/2079-1372-2022-104-2-28-34.

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It is established that at present the technology of anode-spark coatings in general is well studied. However, the lack of recommendations for the choice of modes of technological processes and tribological characteristics in different operating conditions limit the widespread introduction of this technology. The task of this work was to analyze the processes of anode-spark coatings, improve technology and study the wear resistance of samples processed by this and traditional anode technology. The development of technology for the application of protective coatings on valve metals in the condit

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Meyer,, Donna M., and John A. Tichy,. "3-D Model of a Total Hip Replacement In Vivo Providing Hydrodynamic Pressure and Film Thickness for Walking and Bicycling." Journal of Biomechanical Engineering 125, no. 6 (2003): 777–84. http://dx.doi.org/10.1115/1.1631585.

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Formulation of a 3-D lubrication simulation of a total hip replacement in vivo is presented using a finite difference approach. The goal is to determine if hydrodynamic lubrication is taking place, how thick the joint fluid film is and over what percentage of two gait cycles, (walking and bicycling), the hydrodynamic lubricating action is occurring, if at all. The assumption of rigid surfaces is made, which is conservative in the sense that pure hydrodynamic lubrication is well known to predict thinner films than elastohydrodynamic lubrication (EHL) for the same loading. The simulation method

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Meng, Guang Yao, Ji Wen Tan, and Yi Cui. "Grinding Fluid Flow Field Modeling and Multi-Parameter Numerical Analysis Based on Smooth Model." Advanced Materials Research 156-157 (October 2010): 948–55. http://dx.doi.org/10.4028/www.scientific.net/amr.156-157.948.

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Relative motion between grinding wheel and workpiece makes the lubricant film pressure formed by grinding fluid in the grinding area increase, consequently, dynamic pressure lubrication forms. The grinding fluid flow field mathematical model in smooth grinding area is established based on lubrication theory. The dynamic pressure of grinding fluid field, flow velocity and carrying capacity of lubricating film are calculated by the numerical analysis method. An analysis of effect of grinding fluid hydrodynamic on the total lifting force is performed, and the results are obtained.

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47

Czaban, Adam, and Andrzej Miszczak. "Simulations of the Influence of the Heat Flux at the Shaft Surface of the Conical Slide Bearing on Its Hydrodynamic Lubrication and Operating Parameters." Journal of KONES 26, no. 4 (2019): 29–37. http://dx.doi.org/10.2478/kones-2019-0086.

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AbstractThe aim of this work is to investigate, how in the adopted model of hydrodynamic lubrication of a conical slide bearing, the change of the heat flux value at the bearing shaft, affects bearing operating parameters. In this research, the authors use, the known from the literature, Reynolds type equation, describing the stationary hydrodynamic lubrication process of a conical slide bearing. The analytical, solutions, that determine the components of the lubricating oil velocity vector and the equation (analytical solution of energy equation) determining the three-dimensional temperature

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48

Wang, Leizhen, Wen Wang, Shangjun Chen, and Yujian Bai. "Study on Lubricating Performance of Soft Slider Bearing in Conformal Contact." Journal of Physics: Conference Series 2355, no. 1 (2022): 012074. http://dx.doi.org/10.1088/1742-6596/2355/1/012074.

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ABSTRACT In this paper, the lubricating performance of soft slider bearing in conformal contact is analyzed. Compared with the hard slider, the soft slider will have greater elastic deformation under low pressure. Three kinds of sliders with different elastic modulus are used for comparative study in this paper. The materials of the three sliders are: steel, glass and PMMA. A hydrodynamic lubrication model of conformal contact considering elastic deformation is established according to the theory of fluid lubrication. A program for calculating dynamic pressure lubrication performance of confor

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Li, Kaiyue, Guoding Chen, and Deng Liu. "Study of the influence of lubrication parameters on gear lubrication properties and efficiency." Industrial Lubrication and Tribology 68, no. 6 (2016): 647–57. http://dx.doi.org/10.1108/ilt-06-2015-0089.

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Purpose The analysis of lubricating properties and efficiency is important for aviation high-speed gear. So far, the project of lubricating properties and efficiency are processing under the condition of a given lubricating state, which is still depending on practical experience. This paper aims to mostly focus on the analysis of given lubricating state but lost sight of the relevance of lubrication parameters and lubricating state, which not only makes the analysis of aviation high-speed gear transmission and efficiency fail to trace to practical situation but also has an adverse effect on th

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Gulwadi, S. D. "A Mixed Lubrication and Oil Transport Model for Piston Rings Using a Mass-Conserving Algorithm." Journal of Engineering for Gas Turbines and Power 120, no. 1 (1998): 199–208. http://dx.doi.org/10.1115/1.2818076.

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A numerical study of the interactions between hydrodynamic/boundary lubrication, oil transport, and radial dynamics of a piston ring using a mass-conserving (cavitation) algorithm is presented. The scheme outlined in this investigation facilitates the calculation of the volume of oil accumulating at the leading and trailing edges of the piston ring as it scrapes against the line. The calculation of this oil accumulation is important in the estimation of lubricating oil consumption in engines. The numerical procedure employed in this study is capable of depicting the transition between the vari

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