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Gotowa bibliografia na temat „Lubricated journal bearings”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Lubricated journal bearings"

1

Gao, Geng Yuan, Zhong Wei Yin, Dan Jiang i Xiu Li Zhang. "Researches on Friction Performance of Water-Lubricated Polymer Composite Journal Bearings Based on Experiments". Applied Mechanics and Materials 711 (grudzień 2014): 57–60. http://dx.doi.org/10.4028/www.scientific.net/amm.711.57.

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A composite which is PTFE as a matrix with PEEK and carbon fiber as fillers is developed to fabricate the bush of water-lubricated journal bearings. The bush is fabricated with a new structure that a relatively large straight groove is opened in its upper part. A water-lubricated journal bearing made up of the bush and a steel sleeve is studied using purposed-built test rig. It is shown that the test bearing operates under hydrodynamic lubrication for almost all of the given conditions. The composite developed in the work is a promising material for water-lubricated journal bearings, and the new structure can be well used in water-lubricated journal bearings.

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Lv, Fangrui, Chunxiao Jiao, Qian Jia i Kang Xia. "Influence of Structural and Operating Parameters on Lubrication Performance of Water-Lubricated Polymer Bearing with Journal Misalignment". Lubricants 10, nr 12 (28.11.2022): 336. http://dx.doi.org/10.3390/lubricants10120336.

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Marine water-lubricated polymer bearings support the propeller shaft that stretches out of the ship. The bending deformation of propeller shaft often leads to journal misalignment, significantly impacting the bearing performance. In this paper, a mixed lubrication model for water-lubricated polymer bearing is established considering the effect of journal misalignment, liner elastic deformation, and local turbulence. The influence of key structural and operating parameters on the performance of water-lubricated bearing with journal misalignment is investigated. The results show that the journal misalignment significantly reduces the load-carrying capacity, deteriorates the bearing tribological characteristics, and may cause different axial sections of the bearing to be in different lubrication regimes. Compared with aligned bearings, increasing the length–diameter ratio to improve the load-carrying capacity is significantly weakened for misaligned bearings. Increasing the liner thickness and the load improves axial uniformity of pressure distribution of misaligned bearings. A relatively large clearance ratio decreases the load-carrying capacity and increases the friction coefficient of bearings in the mixed lubrication regime.

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Chen, Pingwei, Tong Wang, Wensheng Ma, Jie Chen i Rui Cao. "Rotordynamic characteristic of water lubricated plain journal bearing under transient load". Journal of Physics: Conference Series 2280, nr 1 (1.06.2022): 012046. http://dx.doi.org/10.1088/1742-6596/2280/1/012046.

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Abstract Transient startup operating parameter has a serious influence on the stability of water-lubricated bearings. In this study, CFD method was used to predict the rotordynamic coefficients of water lubricated bearings under transient loads. The stiffness and damping coefficients versus transient time for water-lubricated bearings are given. The stiffness and damping coefficients versus different transient loads for water-lubricated bearings are also given. The results show that the stiffness and damping coefficients will increase rapidly in a very short time. With the increase of impact time, both of them come to a steady value. With the increase of impact load, the direct stiffness and the direct damping coefficients of water lubricated bearing will increase. The value of cross-coupling stiffness and the cross-coupling damping coefficients will decrease.

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Rho, B.-H., D.-G. Kim i K.-W. Kim. "Noise analysis of oil-lubricated journal bearings". Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 217, nr 3 (1.03.2003): 365–71. http://dx.doi.org/10.1243/095440603762870027.

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The objective of the paper is to provide a procedure for calculating the noise of oil-lubricated journal bearings. In order to obtain acoustical properties of the bearing, a non-linear analysis including rotor imbalance is performed for a rotor-bearing system. Sound pressure levels of the bearing are obtained through frequency analysis of pressure fluctuations calculated from the non-linear analysis using a transmission theory of plane waves. Results show that the sound pressure level of the bearing increases with the rotational speed of the rotor, although the whirl amplitude of the rotor is decreased at high speed. The noise-estimating procedure presented in the paper could be an aid in the evaluation and understanding of acoustical properties of oil-lubricated journal bearings.

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Ma, Can, Qichao Yang, Xiaohang Sun, Kelong Zhang i Liansheng Li. "Performance Analysis of Externally Pressurized Gas Journal Bearing Lubricated with Vapor of R134a in Centrifugal Compressor". Processes 10, nr 10 (13.10.2022): 2067. http://dx.doi.org/10.3390/pr10102067.

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The performance of an externally pressurized gas journal bearing lubricated with R134a vapor used in an oil-free refrigeration centrifugal compressor is calculated by solving Reynold equations with the finite difference method (CFD). The load capacity, stiffness and mass flow rate of refrigerant vapor under conditions of various operational parameters are obtained and compared with that in air gas bearings. In addition, the influences of the average clearance, eccentricity ratios and supply vapor pressure on the static characteristics of journal bearings are investigated and discussed in detail. It concluded that the optimal operation parameters of gas journal bearings lubricated with R134a vapor are different with air journal bearings. These factors should be considered in the design process of R134a refrigerant vapor gas journal bearings.

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Chetti, B. "Elastohydrodynamic Analysis of an Offset Journal Bearing Lubricated with Couple Stress Fluid". International Journal of Engineering Research in Africa 2 (czerwiec 2010): 53–62. http://dx.doi.org/10.4028/www.scientific.net/jera.2.53.

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This work is an investigation of the performance characteristics of an offset journal bearing lubricated with a fluid with couple stresses taking into consideration the elastic deformation of the liner. The couple stresses might be expected to appear in noticeable magnitudes in liquids containing additives with large molecules. The modified Reynolds equation has been solved using the finite difference method. Load carrying capacity, attitude angle, side leakage and friction coefficients are determined for various values of couple stress parameter of a rigid and deformable bearing. It is found that, the static characteristics of journal bearings lubricated with couple stress fluids are improved compared to journal bearings lubricated with Newtonian fluids. It is concluded that, the elastic deformation of the bearing has significant influence on the bearing characteristics.

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Wang, Yanzhen, Zhongwei Yin, Dan Jiang, Gengyuan Gao i Xiuli Zhang. "Study of the lubrication performance of water-lubricated journal bearings with CFD and FSI method". Industrial Lubrication and Tribology 68, nr 3 (11.04.2016): 341–48. http://dx.doi.org/10.1108/ilt-04-2015-0053.

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Purpose Water lubrication is significant for its environmental friendliness. Composite journal bearing is liable to deform for the huge pressure of water film. This paper aims to study the influence of elastic deformation on how lubrication functions in water-lubricated journal bearings and to provide references for designing composite journal bearings. Design/methodology/approach The combination of computational fluid dynamics and fluid-structure interaction is adopted in this paper to study the lubrication performance of water-lubricated compliant journal bearings. The influences of elasticity modulus and Poisson’s ratio on load-carrying capacity and elastic deformation are studied for different rotational speeds. Predictions in this work are compared with the published experimental results, and the present work agrees well with the experimental results. Findings A reference whether elastic deformation should be considered for composite journal bearings is proposed under different working conditions. Besides, a reference to determine water-lubricated plain journal bearings dimensions under different loads and rotational speeds is developed with the effect of both elastic deformation and cavitation being accounted. Originality/value The present research provides references as to whether elastic deformation should be considered in operation and to determine compliant journal bearings’ dimensions in the design process.

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Zhao, Zhiming, i Rui Zhang. "Theoretical and experimental analysis of a water-lubricated rubber journal bearing with a large aspect ratio". Industrial Lubrication and Tribology 72, nr 6 (2.03.2020): 797–803. http://dx.doi.org/10.1108/ilt-10-2019-0440.

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Purpose The hydrodynamic characteristics of liquid film for bearings, especially water-lubricated bearings with a large length-to-diameter ratio, affect the dynamics behavior of rotor bearing systems. The purpose of this study is to carry out theoretical analysis and experiments to determine the hydrodynamic characteristics of water-lubricated journal bearings. Design/methodology/approach The finite difference method is adopted for the simulation of the characteristics of water-lubricated bearings. The comparison results between water-lubricated bearings with and without grooves, as well as with and without the consideration of the effects of rubber deformation, are presented. The test bearings, test bench, and monitoring system, especially the force exciter for the bearing experiment, are presented. Dynamic coefficient identification verification experiments were performed in different working situations. The obtained results include the calibration of magnetic force, two kinds of excitation, vibration data of the rotor system and dynamic coefficients. Findings The theoretical results demonstrate that the hydrodynamic effect was obvious when the speed was increased and that the water film had improved capability at a working speed of 1800 rpm. The identification results reveal the lubrication situation of the test bearing under low-speed and high-load conditions. Moreover, it was found that the liquid film was not continuous at low speeds. Originality/value The theoretical results can lead to the enhancement of the design level of water-lubricated rubber journal bearings with a large aspect ratio. The experimental results can lead to the improvement of the dynamic behavior design of rotor systems supported using water-lubricated bearings with a large length-to-diameter ratio.

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9

Zhang, Yong Fang, Xiao Lei Shi, Yan Jun Lu i Lie Yu. "Numerical Analysis Method and Bifurcation of Gas-Lubricated Journal Bearing-Rotor System with Gyroscopic Effect". Advanced Materials Research 230-232 (maj 2011): 197–201. http://dx.doi.org/10.4028/www.scientific.net/amr.230-232.197.

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Based on the nonlinear theory, the unbalanced responses of the gas-lubricated journal bearing-rotor system are investigated. A time-dependent mathematical model is established to describe the pressure distribution of gas-lubricated journal bearing with nonlinearity. The rigid rotor with gyroscopic effect supported by self-acting gas journal bearing with three axial grooves is modeled. The differential transformation method is employed to solve the time-dependent gas-lubricated Reynolds equation, and the dynamic motion equation is solved by Newmark-β method. The unbalanced responses of the rotor system supported by finite gas-lubricated journal bearings are analyzed by bifurcation diagram, orbit diagram, Poincaré map. The numerical results reveal periodic, period-4 motion of nonlinear behaviors of the system.

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Gengyuan, Gao, Yin Zhongwei, Jiang Dan i Zhang Xiuli. "CFD analysis of load-carrying capacity of hydrodynamic lubrication on a water-lubricated journal bearing". Industrial Lubrication and Tribology 67, nr 1 (9.02.2015): 30–37. http://dx.doi.org/10.1108/ilt-03-2013-0028.

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Purpose – The purpose of this paper is to improve hydrodynamic load-carrying capacity of a water-lubricated journal bearing by a new bush structure. Water-lubricated bearing is becoming more and more popular since it is environmentally friendly and saves energy. However, contrary to oil and grease-lubricated bearings, water-lubricated bearing is limited in many situations due to its low hydrodynamic load-carrying capacity. Design/methodology/approach – The present article proposes a new bearing bush, with a transition-arc structure, which is favorable for increasing hydrodynamic load-carrying capacity. Hydrodynamic load-carrying capacity was calculated by means of three-dimensional computational fluid dynamics (3-D CFD) analysis. Several variants of a journal bearing with a transition-arc structure of different dimensions are analyzed, while the radial clearance of the bearing, eccentricity ratio and the velocity of the journal remain unchanged. Findings – The results show that obvious changes are found in hydrodynamic load-carrying capacity of a water-lubricated journal bearing. For different width over diameter (L/D) bearing ratios, the relationship between hydrodynamic load-carrying capacity and the magnitude of the transition-arc structure dimension is researched. Originality/value – The research presented here leads to a design reference guideline that could be used by the designer engineer to design smart journal bearings for improving the hydrodynamic load-carrying capacity.

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Rozprawy doktorskie na temat "Lubricated journal bearings"

1

Collins, D. "The vibrational characteristics of oil lubricated plain journal bearings". Thesis, University of Leeds, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373844.

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Khan, Muhammad Zubair. "Performance studies of oil lubricated helical groove journal bearing". Thesis, Brunel University, 1992. http://bura.brunel.ac.uk/handle/2438/5434.

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The provision of helical grooves on the surface of a plain journal bearing can improve the stability of a rotor-bearing system. However, the improvement depends on the arrangement of the grooves along the axial length of the bearing. In order to verify this improved stability three types of helical groove bearing and a reference plain journal bearing were investigated. The helical groove journal bearings were: a symmetrical, an asymmetrical and a partial grooved bearing. The bearing test rig was used to measure the oil flow rate, load carrying capacity, power losses, bearing surface temperatures, and stability characteristics. A theoretical model was developed to calculate the load carrying capacity, stiffness and damping coefficients, and stability characteristics of the various types of bearing. The experimental and theoretical results show that at the expense of a reduced load capacity the helical groove bearings are more stable particularly at low eccentricity ratios. However, the experimental observations showed that the partial helical groove bearing is not a practical bearing because the bearing becomes misaligned above certain load. For a given eccentricity ratio and speed the symmetrical bearing ran hotter and with greater power losses in comparison to the other three bearings. At the same eccentricity ratio and speed, the asymmetrical bearing ran at about the same temperature as the plain journal bearing.

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Piekos, Edward S. (Edward Stanley). "Numerical simulation of gas-lubricated journal bearings for microfabricated machines". Thesis, Massachusetts Institute of Technology, 2000. http://hdl.handle.net/1721.1/16738.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2000.
Includes bibliographical references (p. 203-208).
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Numerical simulations of gas-lubricated journal bearings for microfabricated machines are performed with specialized tools. To maximize flexibility, an orbit method formulation is chosen for the primary tool. Its pseudospectral fluid equation solver enables run-time resolution adjustment while maintaining the efficiency advantage of spectral methods. A design framework is established for microfabricated bearings, including several new charts that reflect the unique constraints of MEMS. A duality between applied load and imbalance level is demonstrated and a method for experimentally determining appropriate loads for unknown imbalance is suggested. A large-amplitude whirling mode is shown to exist on both sides of the fixed-point threshold speed, in agreement with experimental observation. A quasi-static method for calculating shock tolerance is suggested and evaluated against unsteady simulations. Simulations of loads applied via non-circumferentially-uniform pressure at the bearing end are shown to increase the attitude angle and decrease the allowable nondimensional mass compared to the equivalent gravity-loaded case. Furthermore, the associated axial pressure gradients are shown to produce a hydrostatic stiffness via inertial effects. A nondimensional model is constructed for this stiffness and its dependence on various parameters is studied. It is shown that the load capacity advantage reported in the literature for noncircular bearings can be canceled by microfabrication constraints. The stability advantage, however, survives. Tapered axial clearance is shown to have an extremely deleterious effect on performance while bowed clearance proves less detrimental. Navier-Stokes solutions of infinite-length bearings with unity inertial parameters are performed using a second specially-built tool. Little change is found in the steady-state results from inertial and curvature effects in the MIT microengine’s parameter space.
by Edward Stanley Piekos.
Ph.D.

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4

Elgezawy, Ahmed Sayed. "A theoretical and experimental study of water lubricated non-metallic journal bearings". Thesis, Queensland University of Technology, 1996.

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Cabrera, D. L. "An investigation into the operation of water-lubricated rubber journal bearings". Thesis, Liverpool John Moores University, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521743.

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Heberley, Brian Douglas. "Advances in hybrid water-lubricated journal bearings for use in ocean vessels". Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/81753.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2013.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (p. 439-441).
The outboard bearings that support shafts in naval ships and submarines present unique challenges to designers, shipbuilders, and operators. Such bearings must operate continuously and reliably in demanding environments at speeds that vary from below 1 rpm to well over 100 rpm. Water-lubricated bearings typically used for these applications operate hydrodynamically and are prone to adverse effects at lower speeds such as increased abrasive and adhesive wear as well as stick-slip shaft motion. This project focuses on developing a hybrid journal bearing capable of operating with hydrostatic pump pressure at lower rpm, while still maintaining the capability for hydrodynamic operation at higher rpm. Benefits of such a system include extending the periodicity between outboard bearing replacements, less abrasion and scoring damage to the propulsion shaft, and preventing stick-slip shaft motion. To enable the in-water replacement of bearings without removal of the propulsion shaft, a partial arc (<180 degree wrap) configuration is required. This partial arc constraint introduces several unique manufacturing difficulties. To address this, a novel manufacturing process has been developed that enables the rapid fabrication of high precision bearings with diameter and roundness errors of less than 0.001" (25.4 microns) on a nominal diameter of 3.24" as measured with a Coordinate Measuring Machine - greatly exceeding the published tolerances of conventional methods. A unique experimental test rig was designed and built in order to measure the performance of 15 different prototype bearing designs. The rig is capable of submerged bearing testing in both hydrostatic and hydrodynamic modes of operation, with fundamental parameters such as speed, torque, loads, pressures, flow rates, and shaft position recorded. The operating characteristics of the bearings were then analyzed to identify key features and variables affecting bearing performance. Certain bearing designs were found to be inherently stable for side loading conditions, without the use of compensation typically used in hydrostatic bearings. This finding led to bearings designed with simplified hydrostatic features and fluid supply systems. Such designs were found to have minimal degradation in hydrodynamic performance, making them particularly suitable for use as hybrid bearings. The key design drivers identified in this work are combined with ancillary factors to discuss the feasibility of hybrid bearings for use in marine applications.
by Brian Douglas Heberley.
Ph.D.

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Hirayama, Tomoko. "Basic Studies on Performances of Small-Sized Oil-Lubricated Spiral-Grooved Journal Bearings". 京都大学 (Kyoto University), 2003. http://hdl.handle.net/2433/148906.

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Tanamal, Tan Kong Hong Ryan. "Modelling of fluid flow in multiple axial groove water lubricated bearings using computational fluid dynamics". Thesis, Queensland University of Technology, 2007. https://eprints.qut.edu.au/16531/1/Tan_Tanamal_Thesis.pdf.

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Extensive research has been conducted in the area of journal bearings over many years for various operating conditions and geometry, effects of different types of lubricants (oil and water), different numbers (zero, one and three) and positions of grooves and the flow of lubricant between the shaft and bearing. One area of research has been developing methods to minimize the experimental time and cost of predicting the performance of journal bearings operating over a wide variety of conditions. This has led to numerical methods being developed and utilised for this purpose. Numerical methods are an important foundation for the development of Computational Fluid Dynamics (CFD). CFD method has proved to be a very useful tool in this research field. This project uses a CFD (specifically FLUENT) approach to simulate the fluid flow in a water lubricated journal bearing with equal spaced axial grooves. Water is fed into the bearing from one end. The lubricant is subjected to a velocity induced flow, as the shaft rotates and a pressure induced flow, as the water is pumped from one end of the bearing to the other. CFD software is used to simulate the fluid flow phenomenon that occurs during the process. Different parameters such as eccentricity ratio, number of grooves and groove orientation to the load line were examined. Lubricant pressure and velocity profiles were obtained and compared with available theoretical and experimental results. Two dimensional studies showed that the predicted maximum pressure and load carrying capacity from CFD were similar to the results from theoretical calculations. A small percentage difference (1.78% - 3.76%) between experimental and theoretical results was found. The pressure distribution in the lubricant shows that grooves decrease the pressure and load carrying capacity of the bearing. Swirl or turbulence does occur in the groove is affected by the viscosity of the lubricant. Three dimensional studies show that the pressure drops linearly from one end of the bearing to the other for no groove, concentric and three grooves cases. As the eccentricity increases, for one groove cases, the shape of the pressure profile changes to parabolic shape at positive region while the other pressure profiles drop linearly. The magnitude of the velocity it the bearing gap increased from 0.8 m/s to about 2.9 m/s when the shaft speed increased from zero to 5.5 m/s for a concentric and no groove case, similar changes were noted for all other cases. An interesting observation occurs when implementing the pressure profiles along the bearing. At cases such as zero and one groove condition and e = 0.4 and 0.6, lubricant flow back is observed at both inlet and outlet i.e. at certain area of the inlet, lubricant flowed out of the bearing against the supply pressure, a similar situation occurred at the exit of the bearing.

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Tanamal, Tan Kong Hong Ryan. "Modelling of fluid flow in multiple axial groove water lubricated bearings using computational fluid dynamics". Queensland University of Technology, 2007. http://eprints.qut.edu.au/16531/.

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Extensive research has been conducted in the area of journal bearings over many years for various operating conditions and geometry, effects of different types of lubricants (oil and water), different numbers (zero, one and three) and positions of grooves and the flow of lubricant between the shaft and bearing. One area of research has been developing methods to minimize the experimental time and cost of predicting the performance of journal bearings operating over a wide variety of conditions. This has led to numerical methods being developed and utilised for this purpose. Numerical methods are an important foundation for the development of Computational Fluid Dynamics (CFD). CFD method has proved to be a very useful tool in this research field. This project uses a CFD (specifically FLUENT) approach to simulate the fluid flow in a water lubricated journal bearing with equal spaced axial grooves. Water is fed into the bearing from one end. The lubricant is subjected to a velocity induced flow, as the shaft rotates and a pressure induced flow, as the water is pumped from one end of the bearing to the other. CFD software is used to simulate the fluid flow phenomenon that occurs during the process. Different parameters such as eccentricity ratio, number of grooves and groove orientation to the load line were examined. Lubricant pressure and velocity profiles were obtained and compared with available theoretical and experimental results. Two dimensional studies showed that the predicted maximum pressure and load carrying capacity from CFD were similar to the results from theoretical calculations. A small percentage difference (1.78% - 3.76%) between experimental and theoretical results was found. The pressure distribution in the lubricant shows that grooves decrease the pressure and load carrying capacity of the bearing. Swirl or turbulence does occur in the groove is affected by the viscosity of the lubricant. Three dimensional studies show that the pressure drops linearly from one end of the bearing to the other for no groove, concentric and three grooves cases. As the eccentricity increases, for one groove cases, the shape of the pressure profile changes to parabolic shape at positive region while the other pressure profiles drop linearly. The magnitude of the velocity it the bearing gap increased from 0.8 m/s to about 2.9 m/s when the shaft speed increased from zero to 5.5 m/s for a concentric and no groove case, similar changes were noted for all other cases. An interesting observation occurs when implementing the pressure profiles along the bearing. At cases such as zero and one groove condition and e = 0.4 and 0.6, lubricant flow back is observed at both inlet and outlet i.e. at certain area of the inlet, lubricant flowed out of the bearing against the supply pressure, a similar situation occurred at the exit of the bearing.

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Garcia, Mathieu. "Refrigerant-lubricated gas foil bearings : A thermo-hydrodynamic study (application to rigid bearings)". Thesis, Lyon, INSA, 2012. http://www.theses.fr/2012ISAL0133/document.

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Des études internes à Liebherr-Aerospace France, concernant la conception de nouveaux compresseurs lubrifiés par gaz réfrigérant, ont montré que dans des conditions de fonctionnement spécifiques, un mélange de vapeur et de liquide apparaît au sein du compresseur, au lieu d'une phase vapeur seule. De ce fait, le comportement des paliers à feuilles lubrifiés au gaz réfrigérant est étudié, y compris la possibilité d'un écoulement diphasique du lubrifiant. L'étude porte sur le comportement du lubrifiant uniquement, dans des conditions de fonctionnement qui sont celles des paliers à feuilles. L'approche Thermo-Hydrodynamique décrit les caractéristiques du lubrifiant telles que la pression, la densité, la viscosité et la température. Dans ce modèle, une équation de Reynolds généralisée pour écoulement turbulent, une équation d'état non-linéaire pour écoulement diphasique et une équation de l'énergie tridimensionnelle pour film-mince et écoulement turbulent sont utilisées. Les paramètres globaux du palier sont calculés en régime permanent
Internal experiments at Liebherr-Aerospace FRANCE on new refrigerant-lubricated compressor designs have shown that under specific operating conditions, a mixture of vapor and liquid appears in the compressor, instead of a single-phase vapor flow. Therefore, refrigerant-lubricated foil bearings behavior is studied, including the likelihood of two-phase flow in the lubricant. We focus on the lubricant behavior only, in the operating conditions of foil bearings. The Thermo-Hydrodynamic approach describes lubricant characteristics such as pressure, density, viscosity, and temperature. It involves the use of a generalized Reynolds equation for turbulent flow, a nonlinear cubic equation of state for two-phase flow and a 3D turbulent thin-film energy equation. Journal bearing global parameters are calculated for steady-state conditions

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Książki na temat "Lubricated journal bearings"

1

Sallinen, Petri. Modeling dynamic behavior in tilting pad gas journal bearings. Lappeenranta: Lappeenranta University of Technology, 2004.

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E, Brewe David, i United States. National Aeronautics and Space Administration., red. On the performance of finite journal bearings lubricated with micropolar fluids. [Washington, D.C.]: National Aeronautics and Space Administration, 1988.

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3

Czolczynski, Krzysztof. Rotordynamics of Gas-Lubricated Journal Bearing Systems. New York, NY: Springer New York, 1999. http://dx.doi.org/10.1007/978-1-4612-1518-9.

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Czolczynski, Krzysztof. Rotordynamics of Gas-Lubricated Journal Bearing Systems. New York, NY: Springer New York, 1999.

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5

Khan, Muhammad Zubair. Performance studies of oil lubricated helical groove journal bearing. Uxbridge: Brunel University, 1992.

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Czolczynski, Krzysztof. Rotordynamics of Gas-Lubricated Journal Bearing Systems (Mechanical Engineering Series). Springer, 1999.

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Litwin, Wojciech. Water Lubricated Journal Bearings: Marine Applications, Design, and Operational Problems and Solutions. Elsevier Science & Technology Books, 2024.

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Części książek na temat "Lubricated journal bearings"

1

Arnell, R. D., P. B. Davies, J. Halling i T. L. Whomes. "Fluid-lubricated Journal Bearings". W Tribology, 161–93. London: Macmillan Education UK, 1991. http://dx.doi.org/10.1007/978-1-349-21387-0_6.

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Arnell, R. D., P. B. Davies, J. Halling i T. L. Whomes. "Fluid-lubricated Journal Bearings". W Tribology, 161–93. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/978-1-4684-8974-3_6.

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Javorova, Juliana, i Alexandru Radulescu. "Performance of Water Lubricated Journal Bearings Under Elastic Contact Conditions". W Machine and Industrial Design in Mechanical Engineering, 141–49. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-88465-9_11.

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Fetisov, A. S., Yu N. Kazakov i A. V. Kornaev. "Study of Trajectories of Rotors in Journal Bearings Lubricated with Aerated Liquids". W Lecture Notes in Mechanical Engineering, 1271–77. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-54814-8_147.

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Shutin, Denis, Leonid Savin i Yuri Kazakov. "Studying the Effect of Viscous Friction Minimization in Actively Lubricated Journal Hybrid Bearings". W Lecture Notes in Mechanical Engineering, 55–64. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-32394-2_5.

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Ruggiero, Alessandro, Roberto D’Amato i Nicolae Ungureanu. "Fluid Film Pressure Description in Finite Turbulent Lubricated Journal Bearings by Using the Warner’s Theory". W Advances in Manufacturing Engineering and Materials, 465–75. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99353-9_49.

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Baidya, Ujjal, Sanjoy Das i Santanu Das. "Influence of Roughness on Micropolar Lubricated Finite Porous Journal Bearing". W Recent Advances in Thermofluids and Manufacturing Engineering, 543–59. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-4388-1_46.

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Vaithianathan, N., i S. Annamalai. "Ansys Fluent Analysis of a Thermo-Hydrodynamically Lubricated Journal Bearing". W Recent Advances in Manufacturing, Automation, Design and Energy Technologies, 615–20. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-4222-7_69.

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Fetisov, A. S., A. Yu Babin i V. O. Tyurin. "Experimental Stand for Research of Journal Bearing Lubricated by Magnetoreological Liquid". W Lecture Notes in Mechanical Engineering, 1263–70. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-54814-8_146.

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Rao, T. V. V. L. N., Ahmad Majdi Abdul Rani, Norani Muti Mohamed, Hamdan Haji Ya, Mokhtar Awang i Fakhruldin Mohd Hashim. "Analysis of Journal Bearing with Partial Texture Lubricated Using Micropolar and Power-Law Fluids". W Tribology in Materials and Applications, 211–25. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-47451-5_11.

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Streszczenia konferencji na temat "Lubricated journal bearings"

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Shoyama, Tadayoshi, Kazuyuki Kouda i Takeshi Ogata. "Saturated Water Journal Bearings of a Turbo Compressor". W ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-58131.

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We have developed a water lubricated journal bearing for water vapor turbo compressor. Utilizing working fluid as liquid lubricant has advantages on high efficiency and structural simplicity of oil-free system. But the evaporation of lubricant effects on various kinds of dynamic properties which must be considered during the development of turbo compressors. The loss, stability, and heat transfer of water lubricated bearings, and the effects of cavitation were studied. When the sub-cool of lubricant water is small, vaporous cavitation is likely to appear. Vaporous cavitation is essentially different from gaseous cavitation of general oil-lubricated bearings in that the evaporation of lubricant occurs which involves latent heat. Because the vaporous cavitation reduces the viscosity loss, and the bearing is cooled not only by sensible heat but also by latent heat, the bearing temperature elevation is suppressed. Another effect of cavitation is stabilization of half speed whirl. We conducted two experiments. Firstly, a sub-scale bearing experiment which consists of 2 conical journal bearings, to investigate the above effects quantitatively and develop a prediction method. Secondly, a full-scale bearing experiment to demonstrate the bearings. As a result, we could drive a 28kg rotor at 31,000rpm stably and efficiently with water lubricated journal bearings.

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Dimofte, Florin, Nicoleta M. Ene, Robert F. Handschuh i Theo G. Keith. "New Rig to Test Journal Oil Lubricated Wave Bearings". W ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44293.

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A new rig to test journal fluid film bearings was designed, manufacture and installed at NASA Glenn Research Center in Cleveland, Ohio, USA. This rig can apply total radial loads to 133,000 N (30,000 lbs) and can rotate the shaft to speeds to 13,000 RPM. The test bearing has a diameter of 68 mm and is 38 mm long. Two such bearings are used to support the total load. The shaft is also supported by two fluid film bearings. The rig is well instrumented for measuring oil flow, oil inlet and outlet temperatures, bearing sleeve temperatures along its circumference and the oil temperatures in oil supply pockets. The shaft position is monitored by proximity probes. Vibration levels at four locations are also displayed and recorded. Preliminary tests of wave bearings at 8,000 RPM and loads to 20,000 N (4,500 lbs) show a good correlation between the test and prediction data.

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Elsharkawy, Abdallah A., i Khaled J. Al-Fadhalah. "Stresses in Bearing Liner of Misaligned Hydrodynamically Lubricated Journal Bearings". W ASME/STLE 2009 International Joint Tribology Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/ijtc2009-15056.

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A numerical study examined the combined effects of journal misalignment and hydrodynamic lubrication on the stress fields of bearing liner under steady state conditions. The oil pressure, obtained by solving Reynolds equation, is imposed on a finite element model of an elastic liner bearing to calculate its stress fields. It was found that large degree of misalignment increases remarkably the oil pressure, and consequently the stresses in the bearing liner become significantly higher.

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Jayaraj, V., i K. Srinivasan. "Experimental Investigation on PTFE Composites for Journal Bearings". W ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-43067.

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Journal bearings are widely used in many industrial applications. In journal bearings, under boundary lubricated conditions, the surfaces are considered to be technically dry or only slightly lubricated, so that the resistance to relative motion is due to the interaction between the highest asperities covered by the boundary film. A thin film of lubricating oil exists under this condition and there is partial metal to metal contact. The ideal situation where the two sliding surfaces are completely separated by a thin film of a viscous fluid or a gas is referred to as hydrodynamic lubrication. In hydrodynamic bearings, due to frequent starting and stopping, misalignment of the shaft with the bearing, application of heavy loads and unexpected sudden non flow of lubricant and such other service conditions result in boundary lubrication by squeezing out the lubricating film or allow the surface asperities to break through the film so that the shaft and bearing are pressed into contact with one another. The maximum wear occurs in fluid film bearings during boundary lubricated conditions. The use of dry bearings has therefore become more essential as it requires practically no lubricant to function. Moreover it is less expensive, resist contamination better compared to rolling element bearings and easier to design.

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Alshaer, B. J., i H. M. Lankarani. "Formulation of Dynamic Loads Generated by Lubricated Journal Bearings". W ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/dac-21090.

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Abstract This paper addresses the analytical evaluation of dynamic pressures and forces produced by the lubricant in a lubricated long journal bearing under dynamic loading. An evaluation of accuracy of the widely adopted Ott’s solution is conducted. The results show that when the journal center is moving toward the center of the bearing and the eccentricity ratio is high, the force formulation according to Ott’s solution give inaccurate results. Differences as high as 93% is found between Ott’s analytical solution and the numerical solution for certain conditions. Starting from Reynolds partial differential equation of lubrication theory, a new formulation for the dynamic characteristics of lubricated long journal bearing under dynamic loading is presented. The analytical integrations were conducted utilizing the Sommerfeld variable. The lubricant forces calculated at certain instants of time showed exact match with the numerical solution, which is not the case with Ott’s solution. The pressure distribution in the new formulation showed a slight difference compared to the Ott’s solution. The methodology presented in the new formulation to calculate the zero pressure angles at any instant of time showed exact match with the numerical results regardless of sharp changes in the pressure between the positive and negative regions. The new formulation is utilized in evaluating the transient and steady state characteristics of lubricated long journal bearing under unidirectional constant load and the results arc compared with the Ott’s solution.

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Stingelin, Valentin. "The Stability of the Self-Lubricated Journal Slider Bearing". W ASME 2014 12th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/esda2014-20024.

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Un-equivocal criteria could be established assuring a perfectly stable operation of the shaft in a restricted, but nevertheless technically interesting range of operational conditions. It enables bearing designers to choose all physical and operational parameters in order to avoid the so called “half speed whirl”. This study hopes to bring enough new elements to attenuate the ill merited reputation of such bearings. Therefore the relevant dimensionless numbers were identified and quantified. What was done for an L/D=1, can be applied to any other bearing configuration, provided the quasi-steady reaction forces, acting on the shaft, are known for the entire range of eccentricities 0<ε<0.9.

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Alshaer, B. J., H. M. Lankarani i S. Shivaswamy. "Dynamics of a Multibody Mechanical System With Lubricated Long Journal Bearings". W ASME 2001 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/detc2001/dac-21091.

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Abstract Clearances exist in different kinds of joints in multibody mechanical systems, which could drastically affect the dynamic behavior of the system. If the joint is dry with no lubricant, impact occurs, resulting in wear and tear of the joint. In practical engineering design of machines, joints are usually designed to operate with some lubricant. Lubricated journal bearings are designed so that even when the maximum load is applied, the joint surfaces do not come into contact with each other. In this paper, a general methodology for modeling lubricated long journal bearings in multibody mechanical systems is presented. This modeling utilizes a new method of solving for the forces produced by the lubricant in a dynamically loaded long journal bearing. A perfect revolute joint in a multibody mechanical system imposes kinematic constraints, while a lubricated journal bearing joint imposes force constraints. As an application, the dynamic response of a crank-slider mechanism including a lubricated journal bearing joint between the connecting rod and the slider is considered and analyzed. The dynamic response is obtained by numerically solving the constraint equations and the forces produced by the lubricant simultaneously with the differential equations of motion and a set of initial conditions numerically. The results are compared with the previous studies performed on the same mechanism as well a dry clearance joint. It is shown that in a multibody mechanical system, the journal bearing lubricant introduces damping and stiffness to the system. The earlier studies previous predict that the order of magnitude of the reaction moment is twice that of a perfect revolute joint. The proposed model predicts that the reaction moment is within the same order of magnitude of the perfect joint simulation case.

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Reddy, D. Sudheer Kumar, S. Swarnamani i B. S. Prabhu. "Tribology of High Speed Aerodynamic Foil Journal Bearings". W ASME 1997 Turbo Asia Conference. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-aa-082.

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Foil journal bearings come under the category of air lubricated journal bearings where the lubricant is atmospheric air. In this type of bearings the pressure developed is due to the aerodynamic wedge developed between the rotating shaft and the foil bearing surface. This paper is concerned with the analysis of the bending dominated type foil bearing, in which the compliance is effected mainly through the bending of foils. The nonlinear Reynolds equation has been used for the aerodynamic pressure solution. Effect of elastohydrodynamics on foil journal bearing has been studied. The problem has been formulated using incremental finite element method. Two types of bending dominated foil bearings have been considered for analysis, namely straight foil type and curved foil type bearings. The equations for the dynamic coefficients were obtained by a perturbation technique and the results were computed using the finite element method. The effect of bearing compliance and the bearing number on performance parameters has been studied, the results were compared with the available literature.

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Villar, M. M., i M. M. Pe´rez. "Elastic Analysis of Journal Bearings". W ASME 7th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2004. http://dx.doi.org/10.1115/esda2004-58533.

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In this paper a numerical model is used to investigate the effect of the elasticity of the bearing in the pressure distribution in the lubricant and the stress distribution in the bearing. The lubricant film, as well as a bearing, including the lining and the backing of the insert, and the housing, are modeled using the general-purpose ANSYS®5.7 commercial Finite Element program. Results have been obtained for the pressure, radial displacement, hoop and von Mises stress distributions at the surface of the bearing, as well as for the shear stress distribution at the interface between the lining and the backing. A number of conclusions have been drawn regarding the relative significance of the steep pressure gradient at the end of the lubricated region on the hoop stresses that cause localized bending distortions at the surface of the lining. These localized bending distortions, in turn, are likely to cause fatigue failure of the lining.

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Zhang, Yongfang, Jingqun Zhao, Liangjun Xiao, Xianwei Li i Yanjun Lu. "Parameter Optimization of Surface Textures of Oil-lubricated Journal Bearings". W 2016 International Conference on Modeling, Simulation and Optimization Technologies and Applications (MSOTA2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/msota-16.2016.51.

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