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Journal articles on the topic 'Central lubrication system'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Maláková, Silvia, and Samuel Sivák. "Practical Example of Modification of a Gearbox Lubrication System." Lubricants 10, no. 6 (2022): 110. http://dx.doi.org/10.3390/lubricants10060110.

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This paper presents the optimization of the lubrication method of a helical bevel gearbox, which is part of a pickling line. The first gear stage of this gearbox showed frequent failures. The bevel gearing and bearings were damaged. Damage analysis was performed, based on which a change in bevel gearing and bearing lubrication was proposed. In this case, the original transmission was lubricated by dip lubrication. The bevel gear wheel was insufficiently submerged below the lubricating oil level. Due to insufficient lubrication of the bevel gearing, both gear wheels, the bevel pinion, and the b

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2

Wu, Zhi Qiang, and Jun Fang Zhao. "The Design of Plate Mills Hydraulic Lubricating and Monitoring System." Advanced Materials Research 1006-1007 (August 2014): 643–49. http://dx.doi.org/10.4028/www.scientific.net/amr.1006-1007.643.

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Plate mills hydraulic system is made up of several hydraulic stations, lubrication stations and grease stations, these hydraulic stations and lubrication stations are distributed around the mills. Each hydraulic station possesses qualities of successive long working time, high reliability and signal complexity, and it can satisfy diverse demands of high grade pressure or temperature control, etc. This paper is based on these demands, assembling control missions of hydraulic and lubricating stations. Several PLC S7-300 were chosen to match the need of controlling mills hydraulic and lubricating

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Neville, A., A. Morina, T. Liskiewicz, and Y. Yan. "Synovial joint lubrication — does nature teach more effective engineering lubrication strategies?" Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 221, no. 10 (2007): 1223–30. http://dx.doi.org/10.1243/09544062jmes724.

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Nature shows numerous examples of systems which show energy efficiency, elegance in their design and optimum use of materials. Biomimetics is an emerging field of research in engineering and successes have been documented in the diverse fields of robotics, mechanics, materials engineering, and many more. To date little biomimetics research has been directed towards tribology in terms of transferring technologies from biological systems into engineering applications. The potential for biomimicry has been recognized in terms of replicating natural lubricants but this system reviews the potential

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Li, Feng, Feng Guo, Guan Gyuan Liu, and Zhang Gang. "Design and Experiment Study on a New Type of Lubrication Simulation System for Thrust-Ball Bearing in Confined Space." Applied Mechanics and Materials 873 (November 2017): 303–7. http://dx.doi.org/10.4028/www.scientific.net/amm.873.303.

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Many machine components work within an elastohydrodynamic lubrication (EHL) regime. Unconfined space is widely used in EHL formulas for to evaluate film thickness, which is related to operating conditions and material properties. In classical theoretical EHL studies, film pressure matches the loading balance and the location of the lubricated components can be adjusted. In the present study, the lubrication performance is analyzed based on a confined space. A thrust ball bearing lubrication simulation system is designed and used to examine the relationship between velocity and film thickness.

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CZARNY, Ryszard. "INFLUENCE OF FILLERS ON THE RHEOLOGICAL PROPERTIES OF THEIR COMPOSITIONS WITH LUBRICATING GREASES." Tribologia 273, no. 3 (2018): 47–55. http://dx.doi.org/10.5604/01.3001.0010.6120.

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The paper presents the results of studies on the influence of fillers, introduced into lubricating greases, on the rheological properties of resultant grease compositions. These fillers were graphite and PTFE powders. They are added to greases in order to improve their tribological properties. They also affect their rheological properties, and they mainly change the value of the shear stress in grease during its flow in a lubrication system. Knowledge of this value is important in designing automated central lubrication systems in which these compositions may be used. Measurements during exper

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Czarny, Ryszard. "THE EFFECT OF THE TYPE OF WALL MATERIAL AND GREASE COMPOSITION PAIRING ON SHEAR STRESSES IN BOUNDARY LAYER." Tribologia 284, no. 2 (2019): 27–36. http://dx.doi.org/10.5604/01.3001.0013.4146.

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The paper presents the results of research on the influence of fillers introduced into plastic greases on the rheological properties of the boundary layer of the resultant lubricant compositions. The fillers were PTFE and MoS2 powders. They are added to lubricants to improve their tribological properties; however, these fillers also affect the rheological properties of the composition. This affects the change of the shear stress value in the lubricant during its flow in the lubrication system. Knowledge of this value, especially during the flow of the lubricant composition in the boundary laye

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Wang, Yuechang, and Ying Liu. "Understanding the Influences of Multiscale Waviness on the Elastohydrodynamic Lubrication Performance, Part II: The Partial-Film Condition." Lubricants 12, no. 6 (2024): 190. http://dx.doi.org/10.3390/lubricants12060190.

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This paper is the second part of a two-part report studying the responses of a typical point-contact elastohydrodynamic lubrication (EHL) system to multiscale roughness mimicked by wavy surfaces. The wavy surfaces are defined by three key parameters: amplitudes, frequencies, and directions. The previous Part I paper focuses on the full film lubrication condition, while the current paper focuses on the partial film regime where asperity contacts occur. A transient thermal EHL model simulates lubrication problems with different waviness parameters, loads, and speeds. The total number of simulati

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Huo, Junzhou, Jianjun Zhou, Tao Li, Zhichao Meng, and Wei Sun. "Thermal EHL Characteristics Investigation on Axle Box Bearings of Railway Vehicle Based on Slicing Method." Shock and Vibration 2019 (April 2, 2019): 1–14. http://dx.doi.org/10.1155/2019/6981482.

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Lubrication failures of axle box bearings can lead to accidents, such as bearing burnout and hot axle cutting. Presently, the modeling of the vehicle-track system dynamics rarely considers the nonlinear contact load of axle box bearings, and this leads to imperfection in the vehicle-track system dynamics calculation. And then, the load distribution and lubrication characteristics of axle box bearings are difficult to obtain. Therefore, in this paper, we fully consider the time-varying nonlinear contact load of bearings and track irregularity in establishing the bearing-wheel-rail system coupli

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Zhai, Liming, Zhengwei Wang, Yongyao Luo, and Zhongjie Li. "TEHD analysis of a bidirectional thrust bearing in a pumped storage unit." Industrial Lubrication and Tribology 68, no. 3 (2016): 315–24. http://dx.doi.org/10.1108/ilt-07-2015-0092.

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Purpose The purpose of this paper is to analyze lubrication characteristics of a bidirectional thrust bearing in a pumped storage, considering the effect of the thermal elastic deformation of the pad and collar. Design/methodology/approach This study used the fluid–solid interaction (FSI) technique to investigate the lubrication characteristics of a bidirectional thrust bearing for several typical operating conditions. The influences of the operating conditions and the thrust load on the lubrication characteristics were analyzed. Then, various pivot eccentricities were investigated to analyze

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Glazunov, D. V. "Development of the lubricant for side-mounted rail flange lubricators for traction rolling stock." Vestnik of the Railway Research Institute 78, no. 1 (2019): 59–64. http://dx.doi.org/10.21780/2223-9731-2019-78-1-59-64.

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Specificity of operating conditions of the rolling stock defines a number of requirements for lubricants intended for the wheel-rail tribosystem. Lubricants are used for “wheel — rail” contact, the aggregate state of which varies from liquid to solid. When evaluating the lubrication properties of these materials, a significant number of factors must be taken into account, in particular, influence of the environment, method of application, condition of the rail surface. The paper discusses the main operational requirements for lubricants operating in a wheel-rail tribosystem. Temperature ranges

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Lu, Junjie. "Theoretical optimization and experiment on lubrication of floating microgroove cylindrical seal." Industrial Lubrication and Tribology 72, no. 10 (2020): 1217–26. http://dx.doi.org/10.1108/ilt-02-2020-0048.

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Purpose The purpose of this paper is to analyze and improve the lubrication performance of a floating cylindrical seal by investigating micro spiral groove. Design/methodology/approach The lubrication model of is solved by finite difference, considering the influence of convergence eccentricity and Rayleigh step on the gas film period. A lubrication model, which is a gas film of floating microgroove cylindrical seal, is solved under high-precision central difference (finite-difference method-center) for the critical problems of convergence eccentricity and Rayleigh step. And then, an idea on t

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Buczek, Bronislaw, and Anna Zajezierska. "Biodegradable lubricating greases containing used frying oil as additives." Industrial Lubrication and Tribology 67, no. 4 (2015): 315–19. http://dx.doi.org/10.1108/ilt-07-2013-0082.

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Purpose – The aim of this paper was to investigate the possibility of reusing frying oil, obtained during thermal treatment of food in fast-food restaurants for production of plastic greases. Design/methodology/approach – In accordance with the proposed research concept, the used frying oil was to be the base oil of biodegradable plastic greases thickened with calcium 12-hydroxystearate and lithium 12-hydroxystearate. These studies included the determination of the effect of variable amounts of used oil component in the base oil on the properties of the resultant plastic greases. Findings – It

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Kozdrach, Rafał. "The influence of base oil type on the rheological properties of ecological lubricating greases." Nafta-Gaz 77, no. 2 (2021): 127–35. http://dx.doi.org/10.18668/ng.2021.02.07.

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The article presents the results of research on the influence the type of base oil in lubricating compositions has on the rheological parameters of selected lubricants. Vegetable, mineral, and synthetic dispersion phases were used to produce lubricating greases. The modified amorphous silica was used as the dispersed phase. However, as a modifying additive was used a substance containing the antioxidants, corrosion inhibitors, and EP/AW additives. The experiments on rheological properties were carried out using a Physica MCR 101 rotational rheometer (manufactured by Anton Paar), equipped with

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Kennedy, Francis E., Douglas W. Van Citters, Khanittha Wongseedakaew, and Mongkol Mongkolwongrojn. "Lubrication and Wear of Artificial Knee Joint Materials in a Rolling∕Sliding Tribotester." Journal of Tribology 129, no. 2 (2006): 326–35. http://dx.doi.org/10.1115/1.2464130.

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This paper describes the influence of lubrication on wear during testing of materials for artificial knee joints in a rolling∕sliding tribotester built to simulate contact conditions in a total knee replacement. The test configuration consists of parallel cylinders (pucks) of ultrahigh molecular weight polyethylene (UHMWPE) and polished cobalt-chrome alloy in oscillatory rolling∕sliding contact in a bath of dilute (25%) bovine serum. Wear tests of three different UHMWPE materials were run under constant load at 40% sliding for 1.5 million oscillation cycles at 1.5cycles∕s. Wear of the UHMWPE w

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Rahmani, Faisal, Emad Makki, and Jayant Giri. "Influence of Bearing Wear on the Stability and Modal Characteristics of a Flexible Rotor Supported on Powder-Lubricated Journal Bearings." Lubricants 11, no. 9 (2023): 355. http://dx.doi.org/10.3390/lubricants11090355.

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This study has investigated the influence of journal bearing wear on the dynamic behaviour of a flexible rotor with a central disc. Rotors supported on journal bearings are susceptible to self-excited whirling, leading to unstable conditions. Prior knowledge of the stability limit speed is important to avoid the excessive vibration of rotating machines. For the study in this paper, journal bearings were lubricated with powder owing to high-temperature applications where conventional oil lubricants would fail to perform. The governing equations for lubrication were derived using a simplified gr

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16

Trynov, A. V., and D. G. Sivykh. "DEVELOPMENT OF MEASURES TO INCREASE RELIABILITY TURBOCHARGER BEARING UNIT AUTOTRACTOR DIESEL ENGINE." Internal Combustion Engines, no. 1 (September 7, 2022): 12–21. http://dx.doi.org/10.20998/0419-8719.2022.1.02.

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To increase the reliability of small turbochargers, in particular the bearing unit, it is proposed to use in the automatic mode of local cooling of the bearing with compressed air. The design of the turbocharger with the central case which houses the bearing and to which engine oil from the engine lubrication system is brought under excess pressure is considered. This design is the most common among turbochargers of tractor engines. Forced engine modes can be critical for the bearing, accompanied by fluctuations in the exhaust gas temperature, for example, due to an uncontrolled increase in cy

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KOWALEWSKI, Piotr, Anna BROŃCZYK, and Wojciech WIELEBA. "A TRIBOLOGICAL TEST RIG FOR FIBRES, CABLES, AND PLAITINGS." Tribologia 271, no. 1 (2018): 51–55. http://dx.doi.org/10.5604/01.3001.0010.6363.

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The paper presents a description of the mechanical construction, measuring and control systems and the possibilities of a new type tribological testing device. The design was developed and built at the Department of Fundamentals of Machine Design and Tribology of Wroclaw University of Science and Technology. Described tester allows the investigate a friction and wear of components such as fibrous tapes, ropes, plaitings or fibers themselves in contact with solid materials. The paper describes in detail the construction of drive and the load pneumatic system. The innovative system of the device

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Babin, Alexander, Alexey Kornaev, Alexey Rodichev, and Leonid Savin. "Active thrust fluid-film bearings: Theoretical and experimental studies." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 2 (2019): 261–73. http://dx.doi.org/10.1177/1350650119862074.

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Research in the field of active fluid-film bearing has been recently getting more and more attention, integration of control systems becoming one of the most promising means of enhancement of rotor-bearing nodes' characteristics. It has been determined that the vast majority of papers published on active fluid-film bearing only consider radial bearings, and very few focus on thrust bearings. This lack of attention along with the obvious necessity to fill the said gap has triggered the present research. In cases of rotor machines that experience extensive axial loading due to various reasons, e

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Kruszewska, Natalia, Piotr Bełdowski, Piotr Weber, Steven Yuvan, Marcin Drechny, and Marcin Kośmieja. "Formation of Protein Networks between Mucins: Molecular Dynamics Study Based on the Interaction Energy of the System." Energies 12, no. 18 (2019): 3448. http://dx.doi.org/10.3390/en12183448.

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Molecular dynamics simulations have been performed for a model aqueous solution of mucin. As mucin is a central part of lubricin, a key component of synovial fluid, we investigate its ability to form cross-linked networks. Such network formation could be of major importance for the viscoelastic properties of the soft-matter system and crucial for understanding the lubrication mechanism in articular cartilage. Thus, the inter- and intra-molecular interaction energies between the residues of mucin are analyzed. The results indicate that the mucin concentration significantly impacts its cross-lin

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Polycarpou, Andreas A., and Andres Soom. "Two-Dimensional Models of Boundary and Mixed Friction at a Line Contact." Journal of Tribology 117, no. 1 (1995): 178–84. http://dx.doi.org/10.1115/1.2830597.

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Two-dimensional dynamic friction models at a lubricated line contact, operating in boundary and mixed lubrication regimes, are developed. The friction coefficient is shown to be a function of the sliding velocity and the instantaneous separation of the sliding bodies, normal to the sliding direction. The models are based on unsteady friction experiments carried out under constant normal loads and under time-varying sliding velocities. The normal motions at the sliding contact were detected indirectly by contact resistance measurements. The contact resistance is related to the theoretical centr

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Liu, Yuchuan, Q. Jane Wang, Wenzhong Wang, Yuanzhong Hu, and Dong Zhu. "Effects of Differential Scheme and Mesh Density on EHL Film Thickness in Point Contacts." Journal of Tribology 128, no. 3 (2006): 641–53. http://dx.doi.org/10.1115/1.2194916.

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This paper investigates the effects of differential scheme and mesh density on elastohydrodynamic lubrication (EHL) film thickness based on a full numerical solution with a semi-system approach. The solution variation with different schemes and mesh sizes is revealed based on a set of numerical cases in a wide range of central film thickness from several hundred nanometers down to a few nanometers. It is observed that when the film is thick, the effects of differential schemes and mesh density are not significant. However, if the film becomes ultra-thin, e.g., below 10–20 nanometers, the influ

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Wei, Biao, Yi Zhuo, Chaobin Li, and Menggang Yang. "Parameter Optimization of a Vertical Spring-Viscous Damper-Coulomb Friction System." Shock and Vibration 2019 (April 14, 2019): 1–19. http://dx.doi.org/10.1155/2019/5764946.

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A vertical spring-viscous damper-concave Coulomb friction isolation system was firstly proposed, and their parameters were firstly optimized to achieve the best performance under earthquakes. An incremental dynamic analysis method (IDA) and a performance-based assessment framework were used to calculate the system and assess its seismic vulnerability, respectively. Results show that both the friction force and the horizontal component of spring force gradually increase when an earthquake enforce the isolator to slide from its central location. Although other papers propose that an increase of

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Gil, Antonio, Andrés Omar Tiseira, Luis Miguel García-Cuevas, Tatiana Rodríguez Usaquén, and Guillaume Mijotte. "Fast three-dimensional heat transfer model for computing internal temperatures in the bearing housing of automotive turbochargers." International Journal of Engine Research 21, no. 8 (2018): 1286–97. http://dx.doi.org/10.1177/1468087418804949.

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Each of the elements that make up the turbocharger has been gradually improved. In order to ensure that the system does not experience any mechanical failures or loss of efficiency, it is important to study which engine-operating conditions could produce the highest failing rate. Common failing conditions in turbochargers are mostly achieved due to oil contamination and high temperatures in the bearing system. Thermal management becomes increasingly important for the required engine performance. Therefore, it has become necessary to have accurate temperature and heat transfer models. Most ther

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Moshirfar, Majid, Stephanie Zhang, Shreya Pandya, et al. "Central corneal distortion after small-incision lenticule extraction." Journal of Cataract and Refractive Surgery 49, no. 11 (2023): 1183–86. http://dx.doi.org/10.1097/j.jcrs.0000000000001311.

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A 33-year-old woman with a prior history of small-incision lenticule extraction (SMILE) presented with gradual deterioration of vision in her right eye since the surgery. She had undergone bilateral SMILE for myopic correction (−7.00 diopters [D] in the right eye and −6.00 D in the left eye) 3 weeks prior. SMILE was performed with a Zeiss VisuMax femtosecond laser system, with a cap thickness of 120 µm, a cap diameter of 7.50 mm, and a lenticule diameter of 6.50 mm. At the completion of the surgery, loose epithelium was noted at the SMILE incision bilaterally, and bandage contact lenses were p

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Nikolenko, V. N., M. V. Oganesyan, K. I. Urazmetova, et al. "Structure of the subarachnoid lymphatic-like membrane as a meningeal selective barrier and immunological regulator." Neurology, Neuropsychiatry, Psychosomatics 17, no. 3 (2025): 112–19. https://doi.org/10.14412/2074-27112025-3-112-119.

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The subarachnoid lymphatic-like membrane (SLYM), identified through neuroimaging and molecular biology, is an extremely thin fourth subarachnoid meningeal layer that envelops blood vessels within the subarachnoid space. It performs critical functions including immune cell regulation, cerebrospinal fluid (CSF) flow modulation, brain protection, and lubrication. All components of the central nervous system (CNS) drainage system – interstitial fluid, perivascular spaces, CSF, meningeal lymphatic vessels, and cervical lymph nodes – operate in close coordination, providing not only waste and toxin

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Akpan, Umoren, Aniefiok, Eyo, Emmanuel Okon, and Akpan, Sunday Brownson. "Investigating the nexus between Non-Performing Loans in the Nigerian Banking System and Lending to Micro-Small Medium Enterprises." International Journal of Contemporary Research and Review 9, no. 06 (2018): 20778–91. http://dx.doi.org/10.15520/ijcrr/2018/9/06/516.

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Micro-Small and Medium Enterprises (MSMEs) constitute vital ingredients for the lubrication of the development process of any economy. Therefore, Micro-Small and Medium Enterprises are bedrocks of emerging economies as they exact vital roles in promoting and sustaining growth and development. However, in Nigeria MSMEs are facing myriad of challenges and difficulties in funding their activities. Rising trends in Non-performing loans (NPLs) adversely affected availability of loans and advances to economic agents in the Nigerian economy thereby constraining financial intermediation and economic a

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Khan, Aqib Mashood, Muhammad Jamil, Mozammel Mia, et al. "Multi-Objective Optimization for Grinding of AISI D2 Steel with Al2O3 Wheel under MQL." Materials 11, no. 11 (2018): 2269. http://dx.doi.org/10.3390/ma11112269.

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In the present study, the machinability indices of surface grinding of AISI D2 steel under dry, flood cooling, and minimum quantity lubrication (MQL) conditions are compared. The comparison was confined within three responses, namely, the surface quality, surface temperature, and normal force. For deeper insight, the surface topography of MQL-assisted ground surface was analyzed too. Furthermore, the statistical analysis of variance (ANOVA) was employed to extract the major influencing factors on the above-mentioned responses. Apart from this, the multi-objective optimization by Grey–Taguchi m

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Raymond, C. F. "Energy balance of ice streams." Journal of Glaciology 46, no. 155 (2000): 665–74. http://dx.doi.org/10.3189/172756500781832701.

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AbstractAnalysis of the cross-flow transmission of force from the central parts of a well-lubricated ice stream to its margins shows that there is a corresponding shift in the lateral location of motion-induced heat generation. The rate of basal heat generation in the center can be substantially smaller than the local rate of potential energy loss given by driving stress times the speed of downslope motion. The basal heating is a maximum for an intermediate level of lubrication for which speed is about 40% of the speed over a friction-less bed and base stress is about 25% of the driving stress

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Armeni, Anastasia K., Konstantinos Assimakopoulos, Dimitra Marioli та ін. "Impact of estrogen receptor α gene and oxytocin receptor gene polymorphisms on female sexuality". Endocrine Connections 6, № 1 (2017): 44–52. http://dx.doi.org/10.1530/ec-16-0090.

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Over the past decades, research attention has increasingly been paid to the neurobiological component of sexual behavior. The aim of the present study was to investigate the correlation of estrogen receptor α (ERA) gene polymorphism (rs2234693-PvuII) (T→C substitution) and oxytocin receptor gene polymorphism (rs53576) (G→A substitution) with sexuality parameters of young, healthy women. One hundred thirty-three Greek heterosexual women, students in higher education institutions, 20–25 years of age, sexually active, with normal menstrual cycles (28–35 days), were recruited in the study. Exclusi

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Arsovski, Denis. "Assessment of sexual life and social life in people with multiple sclerosis." Health Promotion & Physical Activity 21, no. 4 (2023): 38–45. http://dx.doi.org/10.55225/hppa.476.

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Introduction: Multiple sclerosis is a debilitating condition that affects the central nervous system and is most common in young people. Over time, the relapses associated with the disease can cause damage, and within ten years of onset, half of patients may experience progressive symptoms. Unfortunately, once a patient enters a progressive stage, there is no longer any improvement or remission, though some patients may experience a longer period of stability.Objectives: The goal of this study is to examine the relationship between social and sexual life in patients with multiple sclerosis, co

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Kodnyanko, Vladimir, Stanislav Shatokhin, Andrey Kurzakov, et al. "Numerical Modeling on the Compliance and Load Capacity of a Two-Row Aerostatic Journal Bearing with Longitudinal Microgrooves in the Inter-Row Zone." Applied Sciences 11, no. 12 (2021): 5714. http://dx.doi.org/10.3390/app11125714.

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Aerostatic bearings are attractive, with minimal friction losses, high durability, and environmental friendliness. However, such designs have a number of disadvantages, including low load-bearing capacity and high compliance due to high air compressibility and limited injection pressure. The article proposes a double-row aerostatic journal bearing with an external combined throttling system and longitudinal microgrooves in the inter-row zone. It is hypothesized that the use of microgrooves will reduce the circumferential flows of compressed air, as a result of which the compliance should decre

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Molokov, Nikolai Sergeevich, Gennadiy Petrovich Kicha, and Andrei Veniaminovich Nadezkin. "Influence of lubricating oil centrifugal separation intensity in combined cleaning systems on marine diesel engine." Vestnik of Astrakhan State Technical University. Series: Marine engineering and technologies 2020, no. 3 (2020): 23–32. http://dx.doi.org/10.24143/2073-1574-2020-3-23-32.

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The article considers the rationality of combined lubricating oil cleaning system in the automatically operated marine diesel engines. The system includes a self-recovering filter and  a self-cleaning centrifugal purifier. This combination is found to obtain resource-saving oil using coupled with minimum engine wear and increased reliability. The full-flow filtration of oil in a die-sel engine lubricating system is necessary to protect its friction couples (bearings) from abrasive wear. Centrifugal separation contributes deep oil purification i.e. removal of insoluble impurities reducing

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Chappie, P. J. "Modelling of a Radial-Piston Hydraulic Motor." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 206, no. 3 (1992): 171–80. http://dx.doi.org/10.1243/pime_proc_1992_206_328_02.

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The paper is concerned with the theoretical modelling of the torque-producing mechanism in a radial-piston, eccentric-type, hydraulic motor for low-speed operation. The major difficulty in such an analysis is the description of the frictional losses which, at low speeds, principally result from boundary lubrication conditions. The level of friction is also dependent on the distribution of the transferred forces and the amount of distortion in the bearings These forces vary during the pressure cycle, and squeeze-film effects are introduced between the bearing faces during the period of time fol

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Khudyakov, I. V., I. V. Gritsuk, D. S. Pohorletskyi, M. P. Bulgakov, V. V. Chernenko, and M. E. Litvinov. "Peculiarities of ship power plant diagnostics using the ERS-500 TechSim TRANSAS MIP LTD simulator complex in the process of ship engineers' training." Reporter of the Priazovskyi State Technical University. Section: Technical sciences, no. 47 (December 28, 2023): 273–80. http://dx.doi.org/10.31498/2225-6733.47.2023.300113.

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This paper presents an analysis of the results obtained using the ERS 5000 TechSim Engine Room Simulator software. The software simulates remote control from the ship's central control station using virtual equipment panels, which are dedicated hardware combined into a separate console. The simulator covers the main areas of training in accordance with the International Convention on Standards of Training, Certification and Watchkeeping for Seafarers with the Manila Amendments of 2010 and meets the requirements of IMO Conventions and Resolutions and IEC standards. The simulator is certified by

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Радченко, Андрій Миколайович, Анатолій Анатолійович Зубарєв, Сергій Георгійович Фордуй, Володимир Володимирович Бойчук та Віталій Васильович Цуцман. "АНАЛІЗ ЕФЕКТИВНОСТІ ОХОЛОДЖЕННЯ ПОВІТРЯ КОГЕНЕРАЦІЙНОГО ГАЗОПОРШНЕВОГО МОДУЛЯ УСТАНОВКИ АВТОНОМНОГО ЕНЕРГОЗАБЕЗПЕЧЕННЯ". Aerospace technic and technology, № 7 (31 серпня 2019): 76–80. http://dx.doi.org/10.32620/aktt.2019.7.10.

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The analysis of the efficiency of cooling air of cogeneration gas-piston module of installations for combined production of electric energy, heat, and cold is performed. The installation for energy supply includes two JMS 420 GS-N.LC GE Jenbacher cogeneration gas-piston engines manufactured as cogeneration modules with heat exchangers for removing the heat of exhaust gases, scavenge gas-air mixture, cooling water of engine and lubricating oil. The heat of hot water is transformed by the absorption lithium-bromide chiller AR-D500L2 Century into the cold, which is spent on technological needs an

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Glennie, Simon, Tom Leeson, Ian Rowson, and Bevan Morrison. "Rigless well intervention and trees on wire from a DPII vessel: a case study." APPEA Journal 49, no. 2 (2009): 564. http://dx.doi.org/10.1071/aj08037.

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The Vincent field development is typical subsea development with 11 subsea wells required to be tied back to a central production facility. In 350–400 m of water all subsea operations would be diver-less and the well costs associated with using a semi-submersible rig would be a major element of the total field cost. Sequencing construction vessel and drill rig activities, and aligning this sequence with availability of suitable vessels is often a major challenge on such projects. This was accentuated on this development by the shortage of suitable vessels. In addition to this, multiple mobilis

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Радченко, Андрій Миколайович, Анатолій Анатолійович Зубарєв, Сергій Георгійович Фордуй, Володимир Володимирович Бойчук та Андрій Вікторович Коновалов. "АНАЛІЗ ЕФЕКТИВНОСТІ ОХОЛОДЖЕННЯ ПОВІТРЯ НА ВХОДІ КОГЕНЕРАЦІЙНОГО ГАЗОПОРШНЕВОГО МОДУЛЯ НА ЧАСТКОВИХ НАВАНТАЖЕННЯХ". Aerospace technic and technology, № 8 (31 серпня 2019): 54–58. http://dx.doi.org/10.32620/aktt.2019.8.08.

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The fuel efficiency of the reciprocating gas engine deteriorates with the increase of ambient air temperatures at the inlet to the radiator of the recirculating cooling water system for cooling the scavenge gas/air mixture at the inlet of the working cylinders and the air at the inlet of the scavenge air turbocharger. The peculiarity of cogeneration reciprocating gas modules of plants for combined production of electricity, heat, and cold is the operation mainly at partial loads according to the schedules of consumption of electricity, heat, and cold. The efficiency of cooling air of cogenerat

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Фордуй, Сергій Георгійович, Андрій Миколайович Радченко, Анатолій Анатолійович Зубарєв, Володимир Володимирович Бойчук та Олексій Валерійович Остапенко. "РЕЗЕРВИ ПІДВИЩЕННЯ ЕФЕКТИВНОСТІ ТРАНСФОРМАЦІЇ ТЕПЛОТИ УСТАНОВКИ АВТОНОМНОГО ЕНЕРГОЗАБЕЗПЕЧЕННЯ". Aerospace technic and technology, № 4 (31 серпня 2019): 25–30. http://dx.doi.org/10.32620/aktt.2019.4.05.

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It is analyzed the efficiency of heat conversion in the integrated electricity, heat and cooling supply of the enterprise. The installation for energy supply includes two JMS 420 GS-N.LC GE Jenbacher cogeneration gas engines manufactured as cogeneration modules with heat exchangers for removing the heat of exhaust gases, scavenge gas-air mixture, cooling water of engine and lubricating oil. The heat of hot water is transformed by the absorption lithium-bromide chiller AR-D500L2 Century into the cold, which is spent on technological needs and for the operation of the central air conditioner for

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39

Aziukovskyi, Oleksand, Andrii Ihnatov, and Yevhen Stavychnyi. "IMPROVING THE PROPERTIES OF SPECIAL DOWNHOLE FLUIDS IN FIELD DEVELOPMENT." SCIENTIFIC PAPERS OF DONNTU Series: “The Mining and Geology”, no. 1(27)-2(28)2022 (2022): 96–106. http://dx.doi.org/10.31474/2073-9575-2022-1(27)-2(28)-96-106.

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Purpose. Analytical, laboratory and industrial study, as well as analysis of the basic factors of rationalization of the use of special process fluids in the processes of cleaning, casing and cementing of boreholes drilled in difficult geological and lithological conditions, through the development and implementation of innovative technical and technological techniques and methods. Methodology. The study of borehole circulation, rock cutting and regime-technological processes was carried out using modern methods of physical bench modeling, instrumentation and related materials, as well as proc

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Вержбицкий, А. Н., and М. Г. Лахтюхов. "Lubrication system of central gearboxes of the axle drive gear." Engineering Journal: Science and Innovation, no. 25 (December 2013). http://dx.doi.org/10.18698/2308-6033-2013-12-1126.

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Chu, Li-Ming, Chi-Chen Yu, Qie-Da Chen, and Wang-Long Li. "Elastohydrodynamic Lubrication Analysis of Pure Squeeze Motion on an Elastic Coating/Elastic Substrate System." Journal of Tribology 137, no. 1 (2015). http://dx.doi.org/10.1115/1.4028916.

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A rigid sphere approaching a lubricated flat surface with a layer of elastic coating on the elastic substrate is explored under constant load conditions. The transient pressure profiles, film shapes, elastic deformation, von Mises stress (σvon) during the pure squeeze process under various operating conditions in the elastohydrodynamic lubrication (EHL) regime are discussed. The simulation results reveal that the greater the Young's modulus of coating is, the greater the pressure distribution is, the smaller the contact area is, and the greater the maximum stress (σvon) value is. As the Young’

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Abd Alsamieh, Mohamed. "Behavior of elastohydrodynamic lubricating film point contact problems in the unsteady state of reciprocating motion." World Journal of Engineering, January 16, 2024. http://dx.doi.org/10.1108/wje-09-2023-0321.

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Purpose In this study a numerical analysis of the elastohydrodynamic lubrication point contact problem in the unsteady state of reciprocating motion is presented. The effects of frequency, stroke length and load on film thickness and pressure variation during one operating cycle are discussed. The general tribological behavior of elastohydrodynamic lubrication during reciprocating motion is explained. Design/methodology/approach The system of equations of Reynolds, film thickness considering surface deformation and load balance equations are solved using the Newton-Raphson technique with the G

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Ahmed, B., S. U. Khan, S. Ahmad, S. A. Shehzad, and Wathek Chammam. "Galerkin finite element analysis for peristaltic flow of micropolar fluid through porous soaked inclined tube independent of wavelength." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, November 25, 2021, 095440892110562. http://dx.doi.org/10.1177/09544089211056236.

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In this novel numerical investigation, the application of well-renowned numerical technique known as Galerkin finite element method on full form of Navier-Stokes equations presented peristaltic flow of non-Newtonian fluid confined by a uniformly saturated porous medium. The rheological aspects of non-Newtonian material are discussed by considering micropolar fluid. The flow model consists of system of nonlinear partial differential equations with mixed boundary condition. The flow also experienced an externally applied magnetic field. The effects of inertial forces and the results independent

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Awati, Vishwanath B., Parashuram M. Obannavar, and Mahesh Kumar Nanjaiah. "Multigrid method for the solution of thermal elastohydrodynamic lubrication point contact problem with surface asperities." Mechanical Engineering Advances 1, no. 1 (2023). http://dx.doi.org/10.59400/mea.v1i1.94.

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The paper presents, the numerical investigation of point contact thermal elasto-hydrodynamic lubrication (EHL) with surface asperities are analyzed. The effect of temperature and surface roughness on fluid film thickness is studied in detail. The governing equations comprises Reynolds, film thickness, load balance and energy equations with appropriate boundary conditions. The second order finite difference approximation is used to discretize the governing equations and the resultant nonlinear system of algebraic equations is solved using Multigrid V-cycle with full approximation scheme (FAS) t

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Boettcher, Konrad E. R., and Peter Ehrhard. "Spreading of rotating liquid annular ring with hysteresis effects." Journal of Engineering Mathematics 148, no. 1 (2024). http://dx.doi.org/10.1007/s10665-024-10399-3.

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AbstractThe spreading of a liquid, subjected to centrifugal forces or an air jet, leads to a lowering of the liquid height at the center. If the system is partially wetting, experiments show a break up of the liquid and the appearance of a dry patch at the center. In this article, the spreading of a liquid droplet or a liquid film, featuring a dry patch at the center, is investigated. Via a generalized Tanner’s law, we allow for a contact-angle hysteresis in partially wetting systems. By means of the lubrication approximation, an analytical quasi-steady solution can be derived in the limit of

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Arya, Ujjawal, Farshid Sadeghi, and Andreas Meinel. "Modeling of Aerodynamic Leidenfrost Effect of Oil Droplets." Journal of Tribology, March 18, 2025, 1–32. https://doi.org/10.1115/1.4068246.

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Abstract The objective of this study was to develop a numerical model for Aerodynamic Leidenfrost Effect (ALE) to simulate the levitation of a lubricant drop near a surface with high speed. In this model, the oil droplet is treated as a deformable soft elastic body, whose weight is supported by the air-film lubrication pressure. The Young's Modulus of the oil droplet is represented by its internal pressure and surface tension. In this modeling approach, the two-dimensional compressible Reynolds equation for air and elasticity equations were discretized using the finite difference approach. The

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Shang, Yu Feng, Yi Yang Shen, Meng Chen Zhang, et al. "Progress in salivary glands: Endocrine glands with immune functions." Frontiers in Endocrinology 14 (February 3, 2023). http://dx.doi.org/10.3389/fendo.2023.1061235.

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The production and secretion of saliva is an essential function of the salivary glands. Saliva is a complicated liquid with different functions, including moistening, digestion, mineralization, lubrication, and mucosal protection. This review focuses on the mechanism and neural regulation of salivary secretion, and saliva is secreted in response to various stimuli, including odor, taste, vision, and mastication. The chemical and physical properties of saliva change dynamically during physiological and pathophysiological processes. Moreover, the central nervous system modulates salivary secreti

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Balveer Singh, Jitesh Bansal, Ashok Kumar, Narinder Singh, Sona Goyal, and P. Hemantha Kumar. "An Observational Study for the Clinical Correlation of Sama-Snayugata Vata (Non-Specific Chronic Synovitis) with the Analysis of the Synovial Fluid." AYUSHDHARA, November 5, 2023, 58–65. http://dx.doi.org/10.47070/ayushdhara.v10i5.1401.

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This study delves into the intricate interplay between the Ayurvedic concept of Sama-Snayugata Vata, characterized by the vitiation of Vata dosha affecting the musculoskeletal system, and the analysis of synovial fluid in the context of knee effusion. Synovial fluid, a crucial component within diarthrodial joints, serves to nourish, lubricate, and protect the joint structures. Under normal circumstances, its biochemical composition closely mirrors that of plasma. However, pathological conditions, such as arthritis, can lead to alterations in its constituents, offering insights into underlying

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Park, K., A. Tixier, A. H. Christensen, S. F. Arnbjerg-Nielsen, M. A. Zwieniecki, and K. H. Jensen. "Viscous flow in a soft valve." Journal of Fluid Mechanics 836 (December 11, 2017). http://dx.doi.org/10.1017/jfm.2017.805.

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Fluid–structure interactions are ubiquitous in nature and technology. However, the systems are often so complex that numerical simulations or ad hoc assumptions must be used to gain insight into the details of the complex interactions between the fluid and solid mechanics. In this paper, we present experiments and theory on viscous flow in a simple bioinspired soft valve which illustrate essential features of interactions between hydrodynamic and elastic forces at low Reynolds numbers. The set-up comprises a sphere connected to a spring located inside a tapering cylindrical channel. The spring

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Kümpers, F., and T. Krüger. "REGISTRY STUDY ON PERSISTENT GENITAL AROUSAL DISORDER (PGAD)/GENITOPELVIC DYSESTHESIA (GPD): CLINICAL FEATURES, COMORBIDITIES, DIAGNOSTIC AND THERAPEUTIC APPROACHES." Journal of Sexual Medicine 22, Supplement_2 (2025). https://doi.org/10.1093/jsxmed/qdaf077.035.

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Abstract Objectives Persistent genital arousal disorder (PGAD)/genitopelvic dysesthesia (GPD) is a disabling disease, where patients perceive prolonged genital arousal without any sexual desire. The arousal does not subside after one or more orgasms. Additionaly, there may be an unpleasant sensation in the genito-pelvic area including sensory disturbances in the lower extremities. The condition mainly occurs in women, but also men and children can be affected. Etiopathological considerations reach from peripheral to central nervous system mechanisms. Methods This study comprises a detailed des

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