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Journal articles on the topic 'Lubricated journal bearings'

Author: Grafiati

Published: 6 September 2023

Last updated: 31 July 2025

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1

Cheng, Tao, and Shuyun Jiang. "Investigation of effect of clearance on water-lubricated hydrostatic bearing." Journal of Physics: Conference Series 3043, no. 1 (2025): 012128. https://doi.org/10.1088/1742-6596/3043/1/012128.

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Abstract Water-lubricated hydrostatic bearing is environmentally friendly and of excellent performance. The clearance deeply affects the static and dynamic properties of water-lubricated hydrostatic bearings. The physical and mathematical models of the water-lubricated hydrostatic journals and thrust bearings were established based on which the water-film pressure distribution was calculated. Furthermore, the effect of clearance within the range of 10∼20 μm on the static and dynamic properties of water-lubricated hydrostatic bearings was investigated. Findings revealed that the capacity and st

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2

Gao, Geng Yuan, Zhong Wei Yin, Dan Jiang, and Xiu Li Zhang. "Researches on Friction Performance of Water-Lubricated Polymer Composite Journal Bearings Based on Experiments." Applied Mechanics and Materials 711 (December 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 n

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3

Lv, Fangrui, Chunxiao Jiao, Qian Jia, and Kang Xia. "Influence of Structural and Operating Parameters on Lubrication Performance of Water-Lubricated Polymer Bearing with Journal Misalignment." Lubricants 10, no. 12 (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

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4

Chen, Pingwei, Tong Wang, Wensheng Ma, Jie Chen, and Rui Cao. "Rotordynamic characteristic of water lubricated plain journal bearing under transient load." Journal of Physics: Conference Series 2280, no. 1 (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 t

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5

Ma, Can, Qichao Yang, Xiaohang Sun, Kelong Zhang, and Liansheng Li. "Performance Analysis of Externally Pressurized Gas Journal Bearing Lubricated with Vapor of R134a in Centrifugal Compressor." Processes 10, no. 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 detai

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6

Chetti, B. "Elastohydrodynamic Analysis of an Offset Journal Bearing Lubricated with Couple Stress Fluid." International Journal of Engineering Research in Africa 2 (June 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

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7

Wang, Yanzhen, Zhongwei Yin, Dan Jiang, Gengyuan Gao, and Xiuli Zhang. "Study of the lubrication performance of water-lubricated journal bearings with CFD and FSI method." Industrial Lubrication and Tribology 68, no. 3 (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 elastici

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8

Rho, B.-H., D.-G. Kim, and 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, no. 3 (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

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9

Zhao, Zhiming, and Rui Zhang. "Theoretical and experimental analysis of a water-lubricated rubber journal bearing with a large aspect ratio." Industrial Lubrication and Tribology 72, no. 6 (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 wi

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10

Zhang, Yong Fang, Xiao Lei Shi, Yan Jun Lu, and Lie Yu. "Numerical Analysis Method and Bifurcation of Gas-Lubricated Journal Bearing-Rotor System with Gyroscopic Effect." Advanced Materials Research 230-232 (May 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 roto

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11

Gengyuan, Gao, Yin Zhongwei, Jiang Dan, and Zhang Xiuli. "CFD analysis of load-carrying capacity of hydrodynamic lubrication on a water-lubricated journal bearing." Industrial Lubrication and Tribology 67, no. 1 (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

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12

Piątkowska, Ewa. "Influence of solid particle contamination on the wear process in water lubricated marine strut bearings with NBR and PTFE bushes." Polish Maritime Research 28, no. 4 (2021): 167–78. http://dx.doi.org/10.2478/pomr-2021-0059.

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Abstract This paper reports on a study of the influence of solid particle contamination on the wear process in water-lubricated slide bearings (steel-acrylonitrile-butadiene rubber (NBR) and steel-polytetrafluoroethylene (PTFE)). To compare the wear of the shaft journal and bushes (NBR and PTFE) when lubricated with fresh water and contaminated water, an experiment was carried out to identify key factors that influence the state of wear of slide bearing. The amount of wear was checked by means of geometric structure measurements on the journals, namely, roughness profile measurements using bot

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13

Feng, Huihui, and Shuyun Jiang. "Dynamics of a motorized spindle supported on water-lubricated bearings." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 3 (2016): 459–72. http://dx.doi.org/10.1177/0954406215616653.

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The purpose of this paper is to investigate the dynamic performances of a motorized spindle supported on water-lubricated bearings. A modified transfer matrix method considering both of the translational and tilting dynamic coefficients of the bearings is established. The turbulent Reynolds equation is adopted and numerically solved by the perturbation method and the finite difference method, and the dynamic characteristics of the water-lubricated journal bearings are obtained; the effects of the eccentricity ratio, tilting angle, and the rotational speed on the dynamic coefficients of the wat

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14

Zhang, Xiu Li, Zhong Wei Yin, Dan Jiang, and Geng Yuan Gao. "Comparison of the Lubrication Performances of Water-Lubricated and Oil-Lubricated Plain Journal Bearings." Applied Mechanics and Materials 711 (December 2014): 27–30. http://dx.doi.org/10.4028/www.scientific.net/amm.711.27.

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Water-lubricated bearings have attracted increasing attention in recent years because of their environmental sustainability, simplified design, low cost, good cooling performance and low coefficient of friction. To show the characteristic of water lubrication more clearly, this paper quantitatively compares the lubrication performances of water-lubrication plain journal bearing and oil-lubricated plain journal bearing using CFD method. Bearing length, friction coefficients, power losses and temperature rises are obtained under the same working condition. Results show that water-lubricated bear

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15

Khan, M. Z., and T. A. Stolarski. "Dynamic Performance of Oil-Lubricated Helical Groove Journal Bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 208, no. 1 (1994): 65–73. http://dx.doi.org/10.1243/pime_proc_1994_208_350_02.

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The provision of helical grooves on the surface of a plain journal bearing can, in principle, improve the stability of a rotor-bearing system. The improvement, however, depends on the arrangement of the grooves along the axial length of the bearing. In order to verify this, three types of helical groove bearing with different groove arrangements and a reference plain journal bearing were studied. The bearings were studied in a specially designed test rig. A computer model was also developed to predict the performance of the bearings studied. The experimental and theoretical results produced du

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16

Feng, Hui Hui, Chun Dong Xu, and Feng Feng Wang. "Combined Influence of Misalignment and Orifice Diameter on the Static Performances of Hydrostatic, Water-Lubricated Journal Bearings." Applied Mechanics and Materials 607 (July 2014): 608–11. http://dx.doi.org/10.4028/www.scientific.net/amm.607.608.

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The water-lubricated bearings have gained an increasing focus to overcome the disadvantages of the oil film bearings and gas bearings. In this paper, the influences of orifice diameter in aligned and misaligned conditions on the static performance of two hydrostatic, four-recess, water-lubricated journal bearings used to support a rigid rotor, are investigated. The steady Reynolds equation for the journal bearing for the turbulent bulk flow and the film thickness expression considering tilting angles are used and numerically solved by finite difference method. Results demonstrate that the stat

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17

Ahmed, Omar, Tamer A. El-Sayed, and Hussein Sayed. "A Comparative Study of Theoretical and Experimental Analysis on Balanced and Unbalanced Rotors Supported by Oil- and Water-Lubricated Journal Bearings." Machines 12, no. 10 (2024): 675. http://dx.doi.org/10.3390/machines12100675.

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Studying rotor-bearing systems involving fluid film bearings is essential for designing and assessing the dynamic responses and performance of rotating machinery. They are involved in many applications such as pumps, turbines, and engines. Water-lubricated bearings are often used in many applications where the use of oil-based lubricants is not desirable, such as in environmentally sensitive areas such as water desalination. In this study, dynamic analysis is performed to identify the stability regions that prevent the application of water-lubricated journal bearings. This is achieved by solvi

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18

Heshmat, H. "Advancements in the Performance of Aerodynamic Foil Journal Bearings: High Speed and Load Capability." Journal of Tribology 116, no. 2 (1994): 287–94. http://dx.doi.org/10.1115/1.2927211.

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An advanced-design, aerodynamic, air-lubricated foil journal bearing achieved a landmark speed of 2200 cps (132,000 rpm) and a major breakthrough in load performance of 673.5 kPa (97.7 psi). At 20°C (68°F) room temperature, normal ambient pressure, 995 cps (59,700 rpm) rotor speed, and with bearing projected pad area of 1081 mm2 (1.675 in2), the bearing demonstrated a load capacity of 727.8 N (163.6 lb). The bearing also exhibited low heat generation, with about 40°C (104°F) average side leakage temperature rise. For this demonstration, a highspeed spindle utilizing a pair of 35-mm (1.375-in.)

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19

Yang, Xue Bing, Wan Li Xiong, Zhi Quan Hou, and Ju Long Yuan. "A Method of Parameters Estimation of Water-Lubricated Hybrid Journal Bearings for Ultra-Precision Machine Tool Spindle." Advanced Materials Research 69-70 (May 2009): 270–76. http://dx.doi.org/10.4028/www.scientific.net/amr.69-70.270.

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Water-lubricated hybrid journal bearings have been developed to support the ultra-precision machine tool spindles, due to the prominent properties of high load capacity and stiffness, high rotational accuracy, excellent thermal stability, low power consuming and environmental friendliness. Quasi-analytical procedures are deduced to present a relatively easy and rapid method for estimating of the parameters of the water-lubricated hybrid bearings without resorting to complex full numerical calculation. The procedures are based on the lumped resistance method, which have been extended to the sit

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20

Lai, Tianwei, Yu Guo, Wei Wang, Yu Wang, and Yu Hou. "Development and Application of Integrated Aerodynamic Protuberant Foil Journal and Thrust Bearing in Turboexpander." International Journal of Rotating Machinery 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/8430943.

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Foil bearing provides compliant support and moderate Coulomb friction for rotor-bearing system, which is conducive to stability and reliability of high speed rotating machinery. In this paper, both hydrodynamic lubricated foil journal and foil thrust bearings are applied in a 150 m3·h−1 turboexpander for air separation. In the bearings, protuberant foil is chosen as the supporting subfoil due to its merits of easy fabrication and assembly. Static loading and deflection of the bearings are tested, respectively, before integration into the turboexpander. Afterwards, the loading and deflection cu

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21

NIKOLAKOPOULOS, P. G., and C. A. PAPADOPOULOS. "HIGH SPEED JOURNAL BEARINGS LUBRICATED WITH ELECTRO-RHEOLOGICAL FLUIDS: AN EXPERIMENTAL INVESTIGATION." International Journal of Modern Physics B 10, no. 23n24 (1996): 3045–55. http://dx.doi.org/10.1142/s0217979296001495.

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It is well known that the imposition of an electric field on an Electro-Rheological (ER) fluid alters the viscosity and as a consequence the f flow properties of the f fluid. If such a fluid is used to lubricate a journal bearing system, it is expected that the imposition of an electric field between the rotor and the stator will cause the alteration of the dynamic properties of the journal bearing. For the present, it has been proved that this is valid only for low speeds and high radial clearances of Couette type viscometers. In this paper an experiment in a high speeds (16000 to 65000 s −1)

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22

Li, Qiang, Shuo Zhang, Yujun Wang, Weiwei Xu, Zengli Wang, and Zhenbo Wang. "Dynamic characteristics of water-lubricated journal bearings." Mechanics & Industry 20, no. 4 (2019): 404. http://dx.doi.org/10.1051/meca/2019037.

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The increasing ecological awareness and stringent requirements for environmental protection have led to the development of water lubricated journal bearings. For the investigation of water-lubricated journal bearings, a new structured mesh movement algorithm for the CFD model is developed and based on this method, the nonlinear transient hydrodynamic force model is established. Then, with consideration of velocity perturbation, a method to determine dynamic coefficients and linear hydrodynamic forces is promoted. After validation of static equilibrium position and stiffness coefficients, a com

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23

Bhardwaj, Vivek. "Performance behavior of pocketed journal bearing employing non-newtonian lubricant." Engineering Research Express 3, no. 4 (2021): 045013. http://dx.doi.org/10.1088/2631-8695/ac3323.

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Abstract This paper reports the improvement in the performance behaviors of non-Newtonian fluid lubricated journal bearings employing a rectangular pocket. Coefficient of friction and load carrying capacity of pocketed and non-pocketed bearings are reported and discussed. In the numerical approach, non-Newtonian behavior of lubricant is simulated employing the power law model. Various cases of bearings having different axial length to diameter ratios [(L/D) in the range 0.5–2.0] are considered. Lubricants of different rheology viz. pseudoplastic, Newtonian and shear thickening were employed fo

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24

Patel, Dilip C., and Deepak P. Vakharia. "Determination of Friction Coefficient in Floating Bush Bearings by Strain Gauge Method." International Journal of Automation Technology 4, no. 4 (2010): 389–93. http://dx.doi.org/10.20965/ijat.2010.p0389.

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A floating bush bearing is a kind of journal bearing in which the bushing will float between the journal and bearing. Knowing the frictional coefficient is important for the determination of wear loss and power loss conditions; an appropriate test rig is used to determine friction of floating bush bearings. The frictional coefficient of bearings in dry and lubricated conditions has been examined in experiments.

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25

Czaban, Adam. "CFD Analysis of Hydrodynamic Pressure Distribution in Non-Newtonian Oil in Journal Bearing Lubrication Gap." Solid State Phenomena 220-221 (January 2015): 37–42. http://dx.doi.org/10.4028/www.scientific.net/ssp.220-221.37.

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This paper presents the results of CFD analysis of the hydrodynamic pressure distribution in slide journal bearings lubricated by non-Newtonian oil. It was assumed that the oil shear stress varies from shear rate according to the Ostwald–de Waele relationship (power law lubricant). The comparison was related to bearings differences only in properties of lubricating oil – Newtonian and non-Newtonian properties; other parameters for both in each case were the same. The Tables show relative decrease of the maximum hydrodynamic pressure value and bearing lift capacity according to the bearing lubr

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Das, Subrata, and Sisir Kumar Guha. "Non-linear stability analysis of micropolar fluid lubricated journal bearings with turbulent effect." Industrial Lubrication and Tribology 71, no. 1 (2019): 31–39. http://dx.doi.org/10.1108/ilt-07-2017-0212.

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Purpose The purpose of this paper is to investigate the effect of turbulence on the stability characteristics of finite hydrodynamic journal bearing lubricated with micropolar fluid. Design/methodology/approach The non-dimensional transient Reynolds equation has been solved to obtain the non-dimensional pressure field which in turn used to obtain the load carrying capacity of the bearing. The second-order equations of motion applicable for journal bearing system have been solved using fourth-order Runge–Kutta method to obtain the stability characteristics. Findings It has been observed that tu

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27

Lin, J. R., T. C. Hung, and C. H. Lin. "Linear Stability Analysis of Journal Bearings Lubricated With a Non-Newtonian Rabinowitsch Fluid." Journal of Mechanics 35, no. 1 (2017): 107–12. http://dx.doi.org/10.1017/jmech.2017.48.

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AbstractThe linear stability boundaries of journal bearings lubricated with a non-Newtonian fluid have been investigated in this paper. Based on the Rabinowitsch fluid model, a non-Newtonian dynamic Reynolds equation for journal bearings is derived and then applied to analyze the linear dynamic characteristics of short journal bearings. Comparing with the Newtonian-lubricant case, the non-Newtonian rheology of dilatant lubricants provides a larger area of linearly stable region. However, the non-Newtonian properties of pseudo-plastic lubricants results in a reverse trend for the short journal

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28

Feng, Hui Hui. "Dynamic Characteristics of a Rigid Spindle Supported by Water-Lubricated Bearings." Applied Mechanics and Materials 401-403 (September 2013): 121–24. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.121.

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In this paper, a rigid spindle supported by two identical water-lubricated journal bearings is proposed. The dynamic equations of motion are presented to predicate the performance of the spindle. Under the assumption of linearity, the responses of the rotor excited by constant external force and unbalance force are comprehensively discussed by the fourth Runge-Kutta method. To analyze the static and dynamic characteristics of the water-lubricated bearings, the bulk flow turbulent theory is used and numerically solved by finite difference method. Results of this investigation contribute a bette

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Heshmat, H., and D. Brewe. "Performance of Powder-Lubricated Journal Bearings With MoS2 Powder: Experimental Study of Thermal Phenomena." Journal of Tribology 117, no. 3 (1995): 506–12. http://dx.doi.org/10.1115/1.2831282.

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Powder-lubricated, quasi-hydrodynamic journal bearings assist in controlling wear and hold promise for integration in outer space systems/mechanisms and in other hostile-environment applications where the use of conventional lubricants is impractical. Described herein are the thermal phenomena and an assessment of the thermal stability, heat generation and dissipation characteristics of slider-type, powder-lubricated bearings. Powder lubricant films provide lift and separate bearing surfaces and cause side leakage. The reduction in friction coefficient and, consequently, in the heat generated

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30

Qiang, Mingchen, Qi Zhao, Shaohang Yan, Xue Liu, Yu Hou, and Tianwei Lai. "Performance Prediction of High-Speed Hydrogen Gas-Lubricated Herringbone Grooved Journal Bearing." Applied Sciences 12, no. 13 (2022): 6432. http://dx.doi.org/10.3390/app12136432.

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The liquefaction of hydrogen is considered to be a crucial process in the large-scale utilization of hydrogen energy. In hydrogen liquefaction, hydrogen turbo-expander is a key refrigerating machine for high liquefaction efficiency. Performance of the turbo-expander is directly affected by the hydrogen gas bearings. To obtain a deep understanding of the performance characteristics of hydrogen gas bearings, the static and dynamic characteristics of herringbone grooved journal bearings under hydrogen and other lubricating gases were numerically calculated and compared. The bearing load capacity

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Zhang, Xiaohan, Tao Yu, Hao Ji, et al. "Analysis of Water-Lubricated Journal Bearings Assisted by a Small Quantity of Secondary Lubricating Medium with Navier–Stokes Equation and VOF Model." Lubricants 12, no. 1 (2024): 16. http://dx.doi.org/10.3390/lubricants12010016.

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Due to the low viscosity of water, water-lubricated bearings are susceptible to significant wear and noise in demanding operating conditions. It has been demonstrated that a small quantity of secondary lubricating medium can improve the lubrication performance of water-lubricated contact surfaces and achieve the purpose of temporary risk aversion. As a further step, the feasibility of the proposed idea is experimentally validated on a water-lubricated bearing test bench. A numerical model that couples the N–S equation and the VOF model is then developed to investigate the behavior of the flow

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32

Alshaer, B. J., H. Nagarajan, H. K. Beheshti, H. M. Lankarani, and S. Shivaswamy. "Dynamics of a Multibody Mechanical System With Lubricated Long Journal Bearings." Journal of Mechanical Design 127, no. 3 (2004): 493–98. http://dx.doi.org/10.1115/1.1864112.

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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 mechanica

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Rashidi Meybodi, R., M. Zare Mehrjardi, and A. D. Rahmatabadi. "Tilt angle effects on the performance of micropolar lubricated noncircular journal bearings." Industrial Lubrication and Tribology 69, no. 4 (2017): 536–49. http://dx.doi.org/10.1108/ilt-03-2016-0041.

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Purpose The purpose of this paper is to study tilt angle effects as design parameters of noncircular bearings, on the linear dynamic analyses of micropolar lubricated circular, two, three and four lobe journal bearings. Design/methodology/approach Reynolds equation in dynamic state is modified considering the micropolarity characteristics of lubricant, and it is solved using generalized differential quadrature method. The perturbed components of the dynamic pressure are extracted based on the linear dynamic model. To explain the transient state of the governing equation, through the linear dyn

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34

Khonsari, M. M., and V. Esfahanian. "Thermohydrodynamic Analysis of Solid-Liquid Lubricated Journal Bearings." Journal of Tribology 110, no. 2 (1988): 367–74. http://dx.doi.org/10.1115/1.3261635.

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Thermohydrodynamic theory is extended to include the effect of solid particles in hydrodynamically lubricated journal bearings. Appropriate governing equations and boundary conditions are derived for the fluid flow and heat transfer processes taking place in a finite journal bearing. A general computer program is developed to numerically solve the governing equations. Results are provided for biphase lubricants containing oil with molybdenum disulfide and polytetrafluoroethylene particles. The computational results are in good agreement with experimental findings. The results indicate that the

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Chen, Pingwei, Tong Wang, Wensheng Ma, Fangzhong Li, Tianzhou Wang, and Tao Chen. "Characteristic Analysis of Water Lubricated Plain Journal Bearing under Transient Load." Journal of Physics: Conference Series 2160, no. 1 (2022): 012073. http://dx.doi.org/10.1088/1742-6596/2160/1/012073.

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Abstract Transient load has a huge impact on the life and stability of water-lubricated bearings. In this paper work, CFD software is used to analyse the dynamic characteristic of water lubricated bearings under different transient loads of 500N, 1000N, 2000N and 3000N. The water film pressure contour distribution at different transient time was given. The time-varying relationships between the different transient loads with bearing forces, the journal displacement, the maximum value of water film pressure as well as the minimum value of water film thickness are obtained. The results show that

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Buckholz, R. H., and J. F. Lin. "The Effect of Journal Bearing Misalignment on Load and Cavitation for Non-Newtonian Lubricants." Journal of Tribology 108, no. 4 (1986): 645–54. http://dx.doi.org/10.1115/1.3261295.

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An analysis for hydrodynamic, non-Newtonian lubrication of misaligned journal bearings is given. The hydrodynamic load-carrying capacity for partial arc journal bearings lubricated by power-law, non-Newtonian fluids is calculated for small valves of the bearing aspect ratios. These results are compared with: numerical solutions to the non-Newtonian modified Reynolds equation, with Ocvirk’s experimental results for misaligned bearings, and with other numerical simulations. The cavitation (i.e., film rupture) boundary location is calculated using the Reynolds’ free-surface, boundary condition.

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Olszewski, Artur, Michał Wodtke, and Piotr Hryniewicz. "Experimental Investigation of Prototype Water-Lubricated Compliant Foil Bearings." Key Engineering Materials 490 (September 2011): 97–105. http://dx.doi.org/10.4028/www.scientific.net/kem.490.97.

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First gas-lubricated compliant foil bearings (CFBs) were built in the 1950s. Due to their significant advantages, such as oil-free operation, good tolerance to bearing misalignment and very low maintenance, they have been penetrating the bearing applications for high speed compressors, air-cycle machines and gas turbines. The work presented here investigates a novel idea of water-lubricated compliant foil bearings, which could be used in applications where environmentally friendly lubrication is desired, for example in hydroelectric turbines or water pumps. Experimental results collected for t

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Wang, Chuang, Ziwen Xing, Xi Pan, and Zhilong He. "Simulation of the characteristics of the water-lubricated journal bearing in twin-screw air compressor." Industrial Lubrication and Tribology 70, no. 8 (2018): 1476–86. http://dx.doi.org/10.1108/ilt-05-2017-0134.

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Purpose The well-operating condition of journal bearing is the assurance to keep superior performance of water-lubricated twin-screw compressor. To design the journal bearing more reasonably for this type of compressor, this paper aims to study the effects of rotating speed and design parameters on bearing characteristics, considering surface roughness and bending deformation of the shaft at the same time. Design/methodology/approach The average Reynolds equation considering the effect of surface roughness is adopted and solved by finite difference method and successive over-relaxation method

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Chen, Shouan, Jianlin Cai, Junfu Zhang, and Zaixin Liu. "Thermal Tribo-Dynamic Behaviors of Water-Lubricated Bearings during Start-Up with Journal Shape Error." Lubricants 12, no. 4 (2024): 106. http://dx.doi.org/10.3390/lubricants12040106.

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In practical scenarios, journal bearings often exhibit shape errors due to machining imperfections and operational wear. These deviations from perfect roundness can significantly impact the performance of journal bearings during start-up. This study investigates the impact of journal shape errors on transient mixed lubrications, such as water film temperature and asperity contact, as well as on the rotor dynamics of water-lubricated bearings (WLB) at start-up. The simulation results of the developed numerical model are compared with the experimental data from existing studies to verify their a

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McFadden, P. D., and S. R. Turnbull. "A comparison of methods of modelling the bearing surfaces in an internal combustion engine." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 226, no. 4 (2011): 913–20. http://dx.doi.org/10.1177/0954406211417228.

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An existing model for the dynamic analysis of the piston motion in an internal combustion engine has been modified to incorporate a simpler representation of the piston–cylinder interaction, and to represent the main and big-end bearings as lubricated rather than dry journal bearings. The results demonstrate that the differences in calculated bearing forces and output torques are negligible, indicating that the simple dry journal bearing model is sufficient, but show that the modelling of the interaction between piston and cylinder is considerably improved.

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van der Meer, Gerben, and Ron van Ostayen. "Investigating Film Thickness and Friction of an MR-Lubricated Journal Bearing." Lubricants 13, no. 4 (2025): 171. https://doi.org/10.3390/lubricants13040171.

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Magnetorheological (MR) fluids are frequently reported to have potential as lubricants for hydrodynamic bearings operating at high loads, but no comprehensive effort has been made to investigate their performance under a variety of operating conditions. This paper, therefore, presents an extensive experimental and numerical investigation of an MR-lubricated hydrodynamic journal bearing subjected to different loads and magnetic fields, and compares these results to those of an oil-lubricated bearing. It is shown that by increasing the magnetic field strength, the performance characteristics of

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42

Lu, Xiaobin, and M. M. Khonsari. "An Experimental Investigation of Grease-Lubricated Journal Bearings." Journal of Tribology 129, no. 1 (2006): 84–90. http://dx.doi.org/10.1115/1.2401216.

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A series of experimental results is presented to explore the frictional characteristics of a grease-lubricated journal bearing. Load, grease type, and bushing material are varied to examine their effects on the friction coefficient. The results attest to the existence of distinctive regimes in grease lubrication akin to the oil-lubricated Stribeck curve. A mixed elastohydrodynamic lubrication model for line contacts is employed to estimate the coefficient of friction in mixed lubrication regime. The simulation results capture the basic characteristics of mixed lubrication.

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Srivastava, Ashish, and Faisal Rahmani. "Dynamic characteristics of a flexible rotor supported on surface textured journal bearings." Journal of Physics: Conference Series 2856, no. 1 (2024): 012011. http://dx.doi.org/10.1088/1742-6596/2856/1/012011.

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Abstract This paper presents the dynamic characteristics of a flexible rotor supported on surface textured journal bearings. Oil lubricated journal bearings exhibit the self-exited whirling of rotor, leading to instability. Understanding the threshold speed of instability is crucial in mitigating excessive vibration in rotating machinery. In this work, a simple model of a flexible rotor with central disc is studied. Modal analysis is carried out to obtain the whirl frequencies of the system, mode shapes, and stability limit speed. The addition of surface textures to the journal bearing stands

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Peng, Z.-C., and M. M. Khonsari. "A Thermohydrodynamic Analysis of Foil Journal Bearings." Journal of Tribology 128, no. 3 (2006): 534–41. http://dx.doi.org/10.1115/1.2197526.

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A thermohydrodynamic model is developed for predicting the three-dimensional (3D) temperature field in an air-lubricated, compliant foil journal bearing. The model accounts for the compressibility and the viscosity-temperature characteristic of air and the compliance of the bearing surface. The results of numerical solutions are compared to published experimental measurements and reasonable agreement has been attained. Parametric studies covering a fairly wide range of operating speeds and load conditions were carried out to illustrate the usefulness of the model in terms of predicting the the

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Li, Hulin, Yanzhen Wang, Ning Zhong, Yonghong Chen, and Zhongwei Yin. "Study on the performance of journal bearings in different lubricants by CFD and FSI method with thermal effect and cavitation." MATEC Web of Conferences 249 (2018): 03006. http://dx.doi.org/10.1051/matecconf/201824903006.

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This paper used a new transient computational fluid dynamics and fluid–structure interaction method to investigate the journal bearing performance with the effect of thermal and cavitation, to reveal the performance of journal bearing in different lubricants and to provide substitution references for bearings in different lubricants. Considering thermal effect, elastic deformation and cavitation, a detailed discussion was conducted to show the performance of plain journal bearings lubricated by water, seawater, and lubricating oil by computational fluid dynamics (CFD) and fluid structure inter

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Awati, Vishwanath B., and Ashwini Kengangutti. "Surface roughness effect on thermohydrodynamic analysis of journal bearings lubricated with couple stress fluids." Nonlinear Engineering 8, no. 1 (2019): 397–406. http://dx.doi.org/10.1515/nleng-2018-0017.

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Abstract The paper presents, surface roughness effect for thermo-hydrodynamic analysis of journal bearings extended to couple stress lubricants with high polymer additives. A modified energy equation is simultaneously solved with heat transfer equation as well as modified Reynolds equation by using Multigrid method. The effects of couple stress and surface roughness on the performances of a finite journal bearing are presented in detail. Further, it is shown that lubricants with couple stress and surface roughness, not only increases the load capacity and decreases the friction coefficient, bu

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Cabrera, D. L., N. H. Woolley, D. R. Allanson, and Y. D. Tridimas. "Film pressure distribution in water-lubricated rubber journal bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 219, no. 2 (2005): 125–32. http://dx.doi.org/10.1243/135065005x9754.

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Measurements of fluid film pressures were made on water-lubricated rubber journal bearings. The measurements indicated that the film pressure profiles are very different from those of conventional rigid bearings. The relatively low film pressures caused significant rubber deflections but were too low to produce lubricant viscosity changes. Integration of the pressure in the bearings showed that they operate in the regime of mixed lubrication. The behaviour of the bearings was theoretically investigated using computational fluid dynamics. There was reasonable agreement between computational flu

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Chauhan, Nathi Ram, Arhantika Khera, Shubhi Agarwal, Mehak Bagri, and Aditi Aggarwal. "Effect of Nanoparticle on the Performance of Water Lubricated Journal Bearing." IOP Conference Series: Materials Science and Engineering 1228, no. 1 (2022): 012032. http://dx.doi.org/10.1088/1757-899x/1228/1/012032.

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Abstract Journal bearings have widespread use in machinery with rotating shafts. Hydrodynamic journal bearings have lubricating fluid present between shaft and bearing to reduce friction and allow smooth operation. The lubricating fluid develops pressure when bearing is in operation and this pressure is used to carry load on the shaft. The commonly used lubricants in the industry are petroleum based synthetic oils. To do away with the disposal issues and toxicity regarding synthetic oils, water is used as the lubricating fluid for this study. The effect of adding nanoparticles to water is stud

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Liu, Xichun, and Wei Chen. "Structural Design and Optimization of Herringbone Grooved Journal Bearings Considering Turbulent." Applied Sciences 12, no. 1 (2022): 485. http://dx.doi.org/10.3390/app12010485.

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In order to improve the performance of the traditional constant-width herringbone grooved journal bearing in a computed tomography tube under a high-temperature environment, the present study designed a convergent herringbone grooved journal bearing (HGJB) structure lubricated by liquid metal. The bearing oil film thickness and the Reynolds equation considering the influence of turbulence are established and solved by using the finite difference method in the oblique coordinate system. The performance of the two bearings was compared, and the static and dynamic performance change trends of the

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Bhattacharjee, Biplab, Prasun Chakraborti, and Kishan Choudhuri. "Theoretical investigation of porous hydrostatic journal bearing under micropolar fluid lubrication." Proceedings of the Institution of Mechanical Engineers, Part N: Journal of Nanomaterials, Nanoengineering and Nanosystems 234, no. 1-2 (2020): 11–18. http://dx.doi.org/10.1177/2397791420905236.

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The features of micropolar fluid (a non-Newtonian fluid)–lubricated short single-layered porous hydrostatic journal bearing are analyzed theoretically by an iterative method. To investigate hydrostatic journal bearing characteristics, a modified Reynolds equation in the case of micropolar fluid is derived and solved numerically. The obtained results in this work are validated by comparing the same with previously published results with Newtonian and non-Newtonian lubricants in the form of design charts. The static stiffness and load-carrying capacity of the investigated bearing are 80% and 75%

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