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Готові списки джерел за темами / Friction force and leakage of lip-type seal

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Добірка наукової літератури з теми "Friction force and leakage of lip-type seal"

Автор: Grafiati

Опубліковано: 30 травня 2022

Оновлено: 19 липня 2025

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Статті в журналах з теми "Friction force and leakage of lip-type seal"

1

To̸nder, K. "Finely Striated Lip-Seal Surfaces: Part 1—General Effects." Journal of Tribology 115, no. 4 (1993): 620–24. http://dx.doi.org/10.1115/1.2921685.

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Анотація:

The work presented previously by To̸nder and Salant (1992) is extended and generalized. In that work it was shown that the fine, axially oriented striations found on some lip-seals, under certain conditions, could lead to the total suppression of leakage through a fully lubricated seal. In the present work the behavior of the lubricant annulus is studied, as are the conditions required for leakage suppression. If the latter are met, it is shown that when a certain parameter—here called the seal number—is increased, the lubricant annulus width will shrink. This will lead to a reduction of the f

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2

Bahi, Y., M. El Gadari, and M. Rahmoune. "The Grooved Lip Effect on Reciprocating Hydraulic Rod Seal Performances in Transient Condition: Elastohydrodynamic Lubrication." International Journal of Applied Mechanics and Engineering 25, no. 2 (2020): 11–21. http://dx.doi.org/10.2478/ijame-2020-0017.

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AbstractIt is commonly known that the sealing performance of dynamic seals is significantly influenced by the surface finish. To reduce friction effect and leakage ratio, new generations of grooved lip or shaft have emerged, but only two computational models were performed up to now with a textured elastomeric lip: spiral groove in the axial direction or micro-cavities according to the circumferential direction. However, if the numerical results have confirmed the slight effect of the grooved lip on the rotary lip seal performances, it seems relevant to investigate the influence of such groove

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3

Zhao, Yan, Zhihui Cai, Ziming Feng, Wenzheng Chen, and Heng Yuan. "Multi-Physical Field, Coupled, Mixed Lubrication Analysis of Hydraulic Reciprocating Vacuum Lip Seal." Machines 12, no. 10 (2024): 686. http://dx.doi.org/10.3390/machines12100686.

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Engineering practice has demonstrated that seal failure can result in severe leakage and wear, reducing the efficiency of hydraulic systems and even leading to major safety risks. Currently, analyses of the thermal aspect of seal interfaces are relatively limited, with most studies focusing on mechanical analysis. However, in actual applications, temperature has a significant impact on sealing performance. In this paper, nonlinear elastomechanics, viscous fluid mechanics, micro-contact mechanics, micro-deformation theory, and thermodynamics are coupled to establish a mixed lubrication model co

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4

Kim, Tae Hyung, Chang Gon Kim, Eun Min Park, Sok Choi, and Bo Ram Lee. "Optimal Design of Power Transfer Unit Oil Seal Considering Pressure Drop Generated during Water-Way Driving." Key Engineering Materials 739 (June 2017): 247–51. http://dx.doi.org/10.4028/www.scientific.net/kem.739.247.

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This study investigated the pressure drop generated in the power transfer unit (PTU). During water-way driving, this pressure drop could open the lips of an oil seal and caused critical problems, such as water intrusion into or oil leakage out of the PTU. Optimal design of oil seal shape was proposed in order to prevent the unexpected failure of oil seal. As the result of the test to check the effects of the vacuum pressure, it was found that outside water was flowed into inside at - 0.4 bar for dust lip without any interference, whereas, there was no intrusion of outside weater through the se

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5

Agarwal, Naresh Kumar, and Craig P. Lawson. "A practical method to account for seal friction in aircraft hydraulic actuator preliminary design." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 231, no. 5 (2016): 941–50. http://dx.doi.org/10.1177/0954410016645371.

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Анотація:

Seals are used in hydraulic actuators or any other hydraulic devices to prevent passing of hydraulic fluid from one chamber to another, or to prevent external leakage and entry of any foreign contaminants. The primary function of any hydraulic actuator is to efficiently use hydraulic power to drive a load experienced during movement of control surfaces or movable aircraft structure. Efficient sealing helps in achieving this, but with its own friction which should be as minimal as possible. Thus, the estimation of seal friction force has crucial significance in hydraulic actuators, especially i

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6

Zhang, Sai, Yinghou Jiao, Zhaobo Chen, and Enjie Zhang. "Static Characteristics of Finger Seal considering Contact between Fingers and Rotor." Shock and Vibration 2022 (March 14, 2022): 1–15. http://dx.doi.org/10.1155/2022/5801325.

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Finger seals are a new type of seal with good sealing performance and long service life. The noncontacting feature relies on the gas film force. However, when the seal works in an unsuitable environment or its design parameters are not reasonable, the lifting pad may not be able to generate sufficient air film force. This causes contact between the fingers and the rotor, resulting in a reduced service life of the seal. In view of this situation, this paper proposes a method that can quickly determine whether there is enough gas film force to lift the sealing finger at the design stage. The aer

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7

Qian, Pengfei, Chenwei Pu, Lei Liu, et al. "Development of a new high-precision friction test platform and experimental study of friction characteristics for pneumatic cylinders." Measurement Science and Technology 33, no. 6 (2022): 065001. http://dx.doi.org/10.1088/1361-6501/ac51a6.

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Abstract In order to achieve high-precision pneumatic cylinder friction test, this paper proposes a new direct measurement method based on electric cylinder in which the axially acting forces from the compressed air in the two facing pneumatic cylinders cancel each other out and the detected value of the force transducer is just friction. For the sake of the implementation of the method, a new low-cost test method for identifying deadband of proportional directional valve was proposed, and a set of fuzzy PI constant pressure control system was designed to cope with a certain degree of leakage

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8

Tang, Bing, Jianxin Liao, Zhuobin Zhao, Qinghua Deng, Jun Li, and Zhenping Feng. "Windage and Leakage Losses in Impeller Back Gap and Labyrinth Seal Cavities of Supercritical CO2 Centrifugal Compressors." Applied Sciences 15, no. 7 (2025): 3678. https://doi.org/10.3390/app15073678.

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The windage loss in impeller back gap and labyrinth seal cavities significantly impacts the aerodynamic performances of supercritical carbon dioxide (sCO2) compressors. To accurately calculate windage loss, essential factors affecting the skin friction coefficients Cf,d (disk-type gap) and Cf,s (shaft-type gap), including Reynolds number Re, pressure ratio π, and radius ratio η, are investigated in this paper. The flow characteristics of the gap are analyzed and prediction models are proposed. The results indicate that both Cf,d and Cf,s decrease with increasing Re and grow with π and η, attri

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9

van Leeuwen, H. J., and M. J. L. Stakenborg. "Visco-Elastohydrodynamic (VEHD) Lubrication in Radial Lip Seals: Part 2—Fluid Film Formation." Journal of Tribology 112, no. 4 (1990): 584–92. http://dx.doi.org/10.1115/1.2920302.

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Анотація:

It is shown in Part 1 of this work (Stakenborg et al., 1990) that dynamic excitation of a radial lip seal will result in nonuniform clearances, due to viscous and inertial seal material behavior. These clearances are filled with fluid. Due to entrainment effects in a converging part of the clearance, fluid pressures will develop, which are sufficiently high to overcome the radial preload. These fluid pressures are excellently described by short bearing theory. The viscous and inertial effects can lead to a type of full film lubrication which is designated visco-elastohydrodynamic (VEHD) lubric

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10

Tan, Guibin, Jinfu Li, Cheng Zhou, Ziwei Luo, Xing Huang, and Fei Guo. "Numerical simulation study of high-speed lip seal considering eccentricity." Industrial Lubrication and Tribology, January 25, 2024. http://dx.doi.org/10.1108/ilt-11-2023-0350.

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Purpose This paper aims to focus on the high-speed rotary lip seal in aircraft engines, combining its service parameters, its own structure and application conditions, to study the influence of different eccentric forms, eccentricity, rotational speed and other factors on the performance of the rotary lip seal. Design/methodology/approach A numerical simulation model for high-speed eccentric rotary lip seals has been developed based on the theory of elastic hydrodynamic lubrication. This model comprehensively considers the coupling of multiple physical fields, including interface hydrodynamics

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Дисертації з теми "Friction force and leakage of lip-type seal"

1

Шевченко, Сергій Андрійович. "Удосконалення пневмосистеми запуску ракетних двигунів шляхом стабілізації тиску робочого тіла та поліпшення її динамічних характеристик". Thesis, НТУ "ХПІ", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/29030.

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Анотація:

Дисертація на здобуття наукового ступеня кандидата технічних наук зі спеціальності 05.05.17 – гідравлічні машини та гідропневмоагрегати. – Національний технічний університет "Харківський політехнічний інститут". – Харків, 2017. Дисертація присвячена дослідженню вдосконаленої пневмосистеми багаторазового запуску маршового рідинного ракетного двигуна верхнього ступеня ракети-носія. Система запуску, яка містить частину пневмоблока двигуна, здійснює розкручування турбонасосного агрегату за рахунок подачі стисненого гелію на його турбіну. Особливістю системи є використання регулятора тиску гелію і

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2

Шевченко, Сергей Андреевич. "Усовершенствование пневмосистемы запуска ракетных двигателей путём стабилизации давления рабочего тела и улучшения её динамических характеристик". Thesis, Государственное предприятие "Конструкторское бюро "Южное" им. М. К. Янгеля", 2017. http://repository.kpi.kharkov.ua/handle/KhPI-Press/29036.

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Анотація:

Диссертация на соискание ученой степени кандидата технических наук по специальности 05.05.17 – гидравлические машины и гидропневмоагрегаты. – Национальный технический университет "Харьковский политехнический институт". – Харьков, 2017. Диссертация посвящена исследованию усовершенствованной пневмосистемы многократного запуска маршевого жидкостного ракетного двигателя верхней ступени ракеты-носителя с насосной подачей компонентов топлива в камеру сгорания. Система запуска, в состав которой входит часть пневмоблока двигателя, осуществляет раскрутку турбонасосного агрегата за счет подачи сжатого

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Тези доповідей конференцій з теми "Friction force and leakage of lip-type seal"

1

Kerr, Thomas, and Jordan Nielson. "Dynamic Seal Test Rig: O-Ring Leakage and Sliding Friction Measurements." In ASME Turbo Expo 2022: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/gt2022-82221.

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Abstract Sliding seals play a critical role in the dynamic sealing of a wide-variety of machinery applications. There are many type of sliding seals, such as segmented carbon ring, O-ring, or bellows; and are used as sealing elements in hydraulic rod and piston seals, as well as secondary sealing elements in mechanical and dry-gas seals. Motion between the dynamic and static parts of the machine is most often lubricated by the process fluid, and therefore has leakage. This paper presents a new test rig capable of measuring leakage and friction force of annular sliding seals for a range of seal

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2

Qiu, Bo, Jun Li, and Zhenping Feng. "Investigation of Conjugate Heat Transfer in Brush Seals Using Porous Media Approach Under Local Thermal Non-Equilibrium Conditions." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42550.

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As a type of contacting seal technology, brush seals provide superior sealing performance and flexible behavior. Brush seals have found increasing application in more challenging high-temperature locations in recent years. Thus, the frictional heat generation between the seal bristles and mating surfaces is becoming another major concern for stable operation of brush seals. This study presents detailed investigations on the conjugate heat transfer behavior of brush seals using Computational Fluid Dynamics (CFD) and Finite Element Method (FEM) approaches. A dual-energy equation was proposed to

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3

San Andrés, Luis, Tingcheng Wu, Hideaki Maeda, and Ono Tomoki. "A Computational Fluid Dynamics Modified Bulk Flow Analysis for Circumferentially Shallow Grooved Liquid Seals." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63492.

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In straight-through centrifugal pumps, a grooved seal acts as a balance piston to equilibrate the full pressure rise across the pump. As the groove pattern breaks the development of fluid swirl, this seal type offers lesser leakage and lower cross-coupled stiffnesses than a similar size and clearance annular seal. Bulk-flow models predict expediently the static and dynamic force characteristics of annular seals; however they lack accuracy for grooved seals. Computational fluid dynamics (CFD) methods give more accurate results, but are not computationally efficient. This paper presents a modifi

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4

Prueter, Phillip E., Robert C. Davis, Clay D. Rodery, et al. "Case Studies on the Use of Thermal-Mechanical Finite Element Analysis to Evaluate Weld Ring Gasket and Diaphragm Seal Designs." In ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/pvp2018-84910.

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Анотація:

Weld ring type gaskets are relatively common in the refining and petrochemical industries. These gasket configurations usually consist of two steel rings, fillet-welded to each of the mating flanges with another seal weld between the lips of the two rings. These seal welds or lip seals are sometimes prone to in-service cracking that can eventually lead to leakage and costly equipment downtime. One particular design feature that can significantly influence the propensity for leakage is the shape of the weld rings; flat-lip weld rings or hollow-lip (Omega-seal) weld rings are the two most common

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5

Manabe, Hiroki, Shota Yabui, Hideyuki Inoue, and Tsuyoshi Inoue. "Development of Experimental Active Magnetic Bearing Device for Measurement of Mechanical Seal Reaction Force Acting on Rotor." In ASME 2018 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/detc2018-85883.

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Анотація:

In turbomachinery, seals are used to prevent fluid leakage. At seal part, rotordynamic fluid force (RD fluid force), which causes whirling motion of rotor, is generated. Under certain conditions, the RD fluid force may contribute to instability of the machine. There are several cases that the whirling is accompanied by eccentricity due to the influence of gravity, or the whirling orbit becomes elliptical due to the influence of the bearing support anisotropy. In these cases, mathematical modeling of the RD fluid forces becomes increasingly complex. As a result, the RD fluid force measurement i

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6

Martinez, Fabian C., Aaron J. Knobloch, and Albert P. Pisano. "Apex Seal Design for the MEMS Rotary Engine Power System." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-42071.

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Анотація:

Design, modeling, and analysis of a novel in-plane cantilever apex seal for maintaining high compression ratios in a MEMS-based rotary internal combustion engine are presented. This work is part of an effort to create a portable, MEMS-based Rotary Engine Power System (MEMS REPS) capable of producing power on the order of tens of milliwatts and with an energy density better than that of a conventional battery. A Wankel-type rotary engine is advantageous for a MEMS-based internal combustion engine due to its planar geometry, self-valving operation, and few moving parts. Large scale rotary engine

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7

San Andre´s, Luis, Thomas Soulas, Florence Challier, and Patrice Fayolle. "A Bulk-Flow Model of Angled Injection Lomakin Bearings." In ASME Turbo Expo 2002: Power for Land, Sea, and Air. ASMEDC, 2002. http://dx.doi.org/10.1115/gt2002-30287.

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Анотація:

The paper introduces a bulk-flow model for prediction of the static and dynamic force coefficients of angled injection Lomakin bearings. The analysis accounts for the flow interaction between the injection orifices, the supply circumferential groove, and the thin film lands. A one control-volume model in the groove is coupled to a bulk-flow model within the film lands of the bearing. Bernoulli-type relationships provide closure at the flow interfaces. Flow turbulence is accounted for with shear stress parameters and Moody’s friction factors. The flow equations are solved numerically using a ro

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