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Journal articles on the topic 'Hydrodynamic journal bearings'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Hirani, H., and P. Samanta. "Hybrid (hydrodynamic + permanent magnetic) journal bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 221, no. 8 (2007): 881–91. http://dx.doi.org/10.1243/13506501jet282.

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Survey of patents on bearings indicates the maturity of hydrodynamic and rapid development of magnetic bearings. Active magnetic bearings are costlier compared with permanent magnetic bearings. To understand the performance characteristics of permanent magnetic bearings, an experimental setup has been developed. Experimental studies on radial permanent magnetic bearings demonstrated the drawbacks, such as high axial thrust and low load capacity. This has led the authors to hybridize the permanent magnet with hydrodynamic technology and to explore the possibility of achieving the low starting t

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2

Yang, Jian Xi, Fa Yu Zhang, Jian Ting Liu, and Jian Fang Zhou. "Load-Carrying Capacity Analysis for Sinusoidal Surfaces Hydrodynamic Bearing." Advanced Materials Research 295-297 (July 2011): 1244–50. http://dx.doi.org/10.4028/www.scientific.net/amr.295-297.1244.

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To obtain a new method to improve hydrodynamic bearing carrying capacity, hydrodynamic journal bearing’s characteristics as well as the current study direction are analyzed. According to the calculation of general cylindrical hydrodynamic journal bearing, the mathematic model for sinusoidal surface hydrodynamic bearing’s carrying capacity is established. It is used to calculate, analyze and compare these two bearings’ carrying capacity with example. The bearing, which has the characteristic of sinusoidal surface, has stronger carrying capacity than general cylindrical hydrodynamic bearing. Wha

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3

Baumann, Katrin, and Hermann Freund. "Modelling and Simulation of Aerodynamic Cylindrical Bearings Using ANSYS Hydrodynamic Bearing Element Types." Vehicles 5, no. 3 (2023): 1118–32. http://dx.doi.org/10.3390/vehicles5030061.

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Modern power engine concepts and environmental restrictions demand oil-free lubrication of rotors, for example, by gas bearings. However, the stiffness and damping properties ruling the rotor’s dynamics are poorly documented for aerodynamic bearings and simple calculation methods are lacking. Based on the similarity between aerodynamic and hydrodynamic journal bearings, it is investigated to what extent the hydrodynamic bearing element types of the commercial FE program ANSYS are also suitable for air bearings. Within these elements, the compressibility of the gas is neglected. After verificat

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4

Wang, Chin-Cheng, and Chieh-Lin He. "Numerical study of a hydrodynamic journal bearing with herringbone grooves for oil leakage reduction." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 3 (2018): 439–46. http://dx.doi.org/10.1177/1350650118785660.

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Hydrodynamic journal bearings and herringbone-grooved journal bearings were numerically analyzed using finite volume-based computational fluid dynamics software. Navier–Stokes equations were solved to describe pressure and velocity distributions in three dimensions. Values of the Sommerfeld number were calculated as a benchmark case for a hydrodynamic journal bearing. The predicted values of the Sommerfeld number are comparable to theoretical results from engineering tribology literature. For a hydrodynamic journal bearing, it is found that there is a positive correlation between the maximum p

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5

Diop, Khadim, Abdérafi Charki, Stéphane Champmartin, and Abdelhak Ambari. "Reliability of a Hydrodynamic Journal Bearing." Applied Mechanics and Materials 789-790 (September 2015): 342–52. http://dx.doi.org/10.4028/www.scientific.net/amm.789-790.342.

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Journal fluid bearings are widely used in industry due to their static and dynamic behavior and their very low coefficient of friction. The technical requirements to improve the new technologies design are increasingly focused on the indicators of dependability of systems and machines. Then, it is necessary to develop a methodology to study the reliability of bearings in order to improve and to evaluate their design quality. Few works are referenced in literature concerning the estimation of the reliability of fluid journal bearings. This paper deals with a methodology to study the failure pro

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Li, He, Yuxiang Hua, Qiquan Quan, Deen Bai, Yinchao Wang, and Zongquan Deng. "On the modeling of levitation force for ultrasonic journal bearings actuated by piezoelectric transducers." Journal of Intelligent Material Systems and Structures 29, no. 6 (2017): 1113–19. http://dx.doi.org/10.1177/1045389x17730918.

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Different from conventional hydrostatic or hydrodynamic journal bearings, an ultrasonic journal bearing provides carrying force by air squeeze film generated by high-frequency vibration of bearing bush surfaces. Detailed investigation indicates that studies on levitating force modeling based on fluid dynamics for ultrasonic journal bearings are rarely conducted, and the existing theoretical models generally neglect some significant contributors to levitating force such as gas inertia, surface topography, rarefaction effect, or boundary effect. A modified Reynolds-type equation considering thes

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7

Feng, N. S., and E. J. Hahn. "Vibration Characteristics of Hydrodynamic Fluid Film Pocket Journal Bearings." Advances in Acoustics and Vibration 2010 (December 27, 2010): 1–10. http://dx.doi.org/10.1155/2010/589318.

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Theoretical analyses of hydrodynamic fluid film bearings with different bearing profiles rely on solutions of the Reynolds equation. This paper presents an approach used for analysing the so-called pocket bearings formed from a combination of offset circular bearing profiles. The results show that the variation of the dynamic bearing characteristics with different load inclinations for the pocket bearings is less than that for the elliptic bearing counterpart. It is shown that the natural frequencies as well as the critical speeds, and hence the vibrational behaviour, can also be significantly

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8

Wierzcholski, Krzysztof, and Andrzej Miszczak. "Load Carrying Capacity of Microbearings with Parabolic Journal." Solid State Phenomena 147-149 (January 2009): 542–47. http://dx.doi.org/10.4028/www.scientific.net/ssp.147-149.542.

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This paper presents the load carrying capacity (load capacity) and friction coefficient calculation of hydrodynamic HDD micro-bearing with parabolic profile of journal. One of the reason of such journal profile is that this journal profile contributes to the variation (an increase or decrease) the memory capacity of HDD drive operating on hydrodynamic micro-bearings. Such properties are very important and required in HDD micro-bearings. Up to now, the dynamic behavior of HDD spindle system with fluid micro-bearings was considered by Jang at al. [3]. They simulated an increase in the memory cap

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9

Navthar, Ravindra R., and N. V. Halegowda. "Experimental Investigation of Oil Film Thickness for Hydrodynamic Journal Bearings." Applied Mechanics and Materials 110-116 (October 2011): 2377–82. http://dx.doi.org/10.4028/www.scientific.net/amm.110-116.2377.

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Journal bearings are widely applied in different rotating machineries. These bearings allow for transmission of large loads at mean speed of rotation. These bearings are susceptible to large amplitude lateral vibration due to self-exited instability which is known as oil whirl or synchronous whirl. This oil whirl depends on many parameters such as oil film thickness, viscosity of lubricant, load on bearing, inertia of fluid etc. out of which oil film thickness plays an important role in operation of Journal bearings. As oil film thickness decreases metal to metal contact occurs this further ca

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10

Xiang, Guo, Yanfeng Han, Renxiang Chen, Jiaxu Wang, Xiaokang Ni, and Ke Xiao. "A hydrodynamic lubrication model and comparative analysis for coupled microgroove journal-thrust bearings lubricated with water." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 11 (2019): 1755–70. http://dx.doi.org/10.1177/1350650119884798.

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The novelty of this study is to develop a hydrodynamic lubrication numerical model for coupled microgroove journal-thrust bearings (or coupled bearings) under water-lubricated condition. In the present model, the continuity of the hydrodynamic pressure and the fluid field (or coupled hydrodynamic effect) at common boundary is considered to reveal the mutual effect between the hydrodynamic behavior of the journal bearing and the thrust bearing. The lubrication performances of the coupled microgroove bearing with three bottom shapes, i.e., isosceles triangle, right triangle, and left triangle, a

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11

SĘP, Jarosław, Leszek TOMCZEWSKI, and Lidia GAŁDA. "THE EFFECT OF HELICAL GROOVE PRESENCE ON THE TRIBOLOGICAL PERFORMANCE OF JOURNAL BEARINGS." Tribologia 279, no. 3 (2018): 131–38. http://dx.doi.org/10.5604/01.3001.0012.7021.

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The hydrodynamic bearings could suffer critical damages operating in contaminated environments that cause machine breakdown. In such hard operating conditions, hydrodynamic bearings with grooved journals are less sensitive to damage compared to plain bearings. The wear resistance of the grooved journal bearings is several times greater than that of smooth journal bearings. Contaminants existing in the oil film are moved out from the bearing clearance by the groove created on the journal surface. The presence, shape, and geometry of the groove strongly influence the bearings performance. The ai

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12

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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13

Magar, Sandesh. "A Review on Improvement of Hydrodynamic Journal Bearing by using Bio-Lubricant." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (2021): 1052–55. http://dx.doi.org/10.22214/ijraset.2021.35162.

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Journal bearings typically consists of metal sleeve that fits around a shaft. The sleeve is held in place within a housing. The journal is simply place on the shaft that is surrounded and supported by the bearing. Journal bearings can be made out of metallic or non-metallic materials such as bronze, aluminium etc. Bearings are generally made out of material that is softer than the metal of the shaft. Journal bearings typically consists of metal sleeve that fits around a shaft. The sleeve is held in place within a housing. The journal is simply place on the shaft that is surrounded and supporte

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14

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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15

Gogazeh, Muhammad Mustafa, Hasan Abdelrazzaq Al Dabbas, and Nabil Wanas Musa. "Mathematical Model and Theoretical Investigation of the Performance of Journal Bearing using a discretized Reynolds Lubrication Equation with Finite Width." WSEAS TRANSACTIONS ON APPLIED AND THEORETICAL MECHANICS 18 (December 31, 2023): 327–35. http://dx.doi.org/10.37394/232011.2023.18.31.

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Hydrodynamic journal bearings are widely used for a large number of applications such as rotating turbo machinery, axial flow compressors, axial flow turbines, and internal combustion engines. These types of journals are used to support high loads high speed rotating turbo machinery elements mainly shafts and attached components and also for enhancing the quality of these machines. In this work, the importance of journal bearing and an overview of the Reynolds hydrodynamic equation in three dimensions have been studied using the Boundary Value finite-difference method. The second-order nonline

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16

Kishor, B., and S. K. Gupta. "On the Dynamic Analysis of a Rigid Rotor-Gear Pair-Hydrodynamic Bearing System." Journal of Vibration and Acoustics 111, no. 3 (1989): 234–40. http://dx.doi.org/10.1115/1.3269847.

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This paper is an attempt to provide a dynamic analysis of a rigid rotor-gear pair-hydrodynamic bearing system with journal motions in the oil film space of the bearings. A mathematical model has been developed considering the kinematics of the gear pair as affected by journal motions and using a concept of an instantaneous line of action. Effects of bearing parameters on dynamic tooth loads have been studied. The load-speed environment of hydrodynamic bearings supporting the geared rotors is shown to be affected by journal motions in bearings. Results indicate that, for the given gear pair and

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17

Lu, Daixing, Yinsheng Zhang, and Junjie Lu. "Numerical Study on the Bearing Capacity of Lubricant Film in Journal Bearing with Micro-textured Surface." Journal of Physics: Conference Series 2477, no. 1 (2023): 012039. http://dx.doi.org/10.1088/1742-6596/2477/1/012039.

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Abstract For studying the hydrodynamic lubrication performance of micro-textured radial journal bearings, a numerical model of hydrodynamic lubrication for journal bearings was established first. Solve the established numerical model using FDM, and the lubricant film pressure distribution and static characteristics of bearings were obtained. Considering the processing cost and feasibility of the processing technology, the cylindrical texture arranged in the radial of the bearing shell surface is applied, the lubricant film thickness equation considering the micro-texture is introduced into the

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18

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

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

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19

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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20

Althesa Androva, Muhammad Tauviqirrahman, Nazaruddin Sinaga, Muhammad Khafidh, Muhammad Sagaf, and Hafid. "A Comparative Study on Hydrodynamic Analysis with and without Cavitation Modelling: A Study on Textured Slip Journal Bearing." CFD Letters 16, no. 8 (2024): 48–63. http://dx.doi.org/10.37934/cfdl.16.8.4863.

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In journal bearing modeling, the phenomenon of cavitation is very important to improve the accuracy of the simulation results. This is because cavitation will almost certainly occur because there are convergent and divergent geometries. The results of the simulation will be close to real conditions so that it can have a positive effect on researchers in order to design optimal journal bearings. The effect of modeling without cavitation and with cavitation on journal bearing modeling has a great influence on the lubrication performance of journal bearings. In modeling with cavitation, the maxim

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21

da Silva, Danilo Alvaro, Gregory Bregion Daniel, and Katia Lucchesi Cavalca. "Development of a Robust Test Rig for Tilting Pad Journal Bearing Validation." Machines 10, no. 3 (2022): 189. http://dx.doi.org/10.3390/machines10030189.

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Several theoretical models for predicting the performance of tilting pad journal bearings (TPJB) have been developed by the scientific community over the years. However, reliable validation of the predictions based on the theoretical models, taking into account the complexity of TPJBs, demands robustness in the design and assembly of an improved test rig. Test bench designs for testing hydrodynamic bearings must carefully consider construction details as much as possible to observe the effect from the journal bearing and, consequently, improve the predictability of its dynamical behavior. In t

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22

Mehrotra, Pranav, Paras Seth, Ishaan Nagpal, Devansh Rastogi, and Vivek Kumar. "CFD analysis of hydrodynamic journal bearing operating with non-newtonian lubricant." Journal of Interdisciplinary Mathematics 27, no. 7 (2024): 1637–61. https://doi.org/10.47974/jim-2005.

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The hydrodynamic journal bearing is a crucial machine element used to support radial load in turbomachines. The research in journal bearings focuses on enhancing the steady state and dynamic performance indices. This study deals with the CFD simulations of hydrodynamic journal bearing operating with non-Newtonian lubricants. The CFD simulations have been performed using the Fluent module of Ansys 2023. The Power law fluid model has been used to describe the non-Newtonian character of the lubricant. The plots are generated for maximum fluid pressure, film pressure distribution, and turbulence d

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23

Lu, Huaiqing, Chunyan Cheng, and Zhuxin Tian. "Discussion on the Non-Linear Stability of Short Hydrodynamic Bearings by Applying Rabinowitsch Fluid Model." Lubricants 13, no. 5 (2025): 194. https://doi.org/10.3390/lubricants13050194.

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Using the Rabinowitsch fluid model, the effects of dilatant fluids (a non-Newtonian factor less than 0) and pseudo-plastic fluids (a non-Newtonian factor greater than 0) on the non-linear stability of hydrodynamic journal bearings is discussed. The modified Reynolds equation is solved by the small perturbation method, and the stiffness and damping coefficients and threshold speed of hydrodynamic bearings are obtained. Through the fourth-order Runge–Kutta method, the trajectory of the journal center is traced and the non-linear stability boundary of hydrodynamic bearings with different non-Newt

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Viana, Carlos Alberto Alves, Diogo Stuani Alves, and Tiago Henrique Machado. "Linear and Nonlinear Performance Analysis of Hydrodynamic Journal Bearings with Different Geometries." Applied Sciences 12, no. 7 (2022): 3215. http://dx.doi.org/10.3390/app12073215.

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In rotor dynamics, a traditional way of representing the dynamics of hydrodynamic bearings is using stiffness/damping coefficients. It is thus necessary to carry out a linearization of hydrodynamic forces around the shaft’s equilibrium position. However, hydrodynamic bearings have highly nonlinear nature, depending on operating conditions. Therefore, this paper discusses the applicability of these linear/nonlinear approaches using a computational model of the rotating system, where the finite element method is used for rotor modelling and the finite volume method for bearing calculation. The m

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Santos, I. F., and F. H. Russo. "Tilting-Pad Journal Bearings With Electronic Radial Oil Injection." Journal of Tribology 120, no. 3 (1998): 583–94. http://dx.doi.org/10.1115/1.2834591.

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This paper gives a theoretical treatment of the problem of journal bearings modeling connected to electronic oil injection into the bearing gap. The feasibility of influencing the static behavior of hydrodynamic forces by means of such oil injection is investigated. The lubricant is injected into the bearing gap by two mechanisms of lubrication: the conventional hydrodynamic lubrication and through orifices distributed along the bearing surface (active lubrication in the radial direction). By controlling the pressure of the oil injection, it is possible to get large variations in the active hy

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Ursolov, Aleksandr, Yuriy Batrak, and Wieslaw Tarelko. "Application of the Optimization Methods to the Search of Marine Propulsion Shafting Global Equilibrium in Running Condition." Polish Maritime Research 26, no. 3 (2019): 172–80. http://dx.doi.org/10.2478/pomr-2019-0058.

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Abstract Full-film hydrodynamic lubrication of marine propulsion shafting journal bearings in running condition is discussed. Considerable computational difficulties in non-linear determining the quasi-static equilibrium of the shafting are highlighted. To overcome this problem the approach using two optimization methods (the particle swarm method and the interior point method) in combination with the specially developed relaxation technique is proposed. The developed algorithm allows to calculate marine propulsion shafting bending with taking into account lubrication in all journal bearings a

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Wang, Chin-Cheng, and Jyun-Ting Lin. "Numerical study of hydrodynamic herringbone-grooved journal bearings combined with thrust bearings considering thermal effects." Journal of Mechanics 38 (2022): 13–21. http://dx.doi.org/10.1093/jom/ufab036.

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Abstract Hydrodynamic herringbone-grooved journal bearings (HGJBs) are analyzed by solving Navier–Stokes and energy equations. It is well known that the load capacity of hydrodynamic bearings may be affected by high temperatures and low oil viscosity. Therefore, the main objective of this study is to understand the pressure distribution of hydrodynamic HGJBs under different oil viscosity and eccentricity ratios. In this paper, 3 different configurations are studied, namely, a HGJB, a combined HGJB and thrust bearing, and a combined HGJB and grooved thrust bearing. The bearing characteristics,

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Nadia, Bendaoud, and Mehala Kadda. "Numerical Analysis of the Fluid Flow Behavior in the Plain Journal Bearing at Textured and Not Textured Surface." International Journal of Surface Engineering and Interdisciplinary Materials Science 9, no. 1 (2021): 40–59. http://dx.doi.org/10.4018/ijseims.2021010103.

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Hydrodynamic plain bearings are components that provide the guiding in rotation of rotating machines, such as turbines, the reactors. This equipment works under very severe operating conditions. In order to improve the hydrodynamic performance of these rotating machines, the industrialists specialized in the manufacture of hydrodynamic bearings have designed a bearing model with its textured interior surface. The numerical analysis is carried out to study the for both plain bearings types with a textured a non-textured surface thus to see the improvement of the plain bearing hydrodynamic perfo

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MAHESH, B. NIGADE, G.E. KONDHALKAR PROF., and PATIL PROF.DR.Y.P. "EXPERIMENTAL ANALYSIS OF HYDRODYNAMIC SIMPLE JOURNAL BEARING." JournalNX - A Multidisciplinary Peer Reviewed Journal 2, no. 11 (2016): 5–7. https://doi.org/10.5281/zenodo.1468136.

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The new machine design applications require high operating speed, higher power density, small size, high load carrying capacity and to full fill this requirement it is necessary to consider transmission section. So one of the most important element to be considered for design is bearing. Bearing not only support rotor weight and operating speed but also influence on rotor dynamic behaviour This constant trend towards higher power densities in rotating machinery calls for better mechanical components capable of carrying higher loads while being the same or smaller in size without sacrificing ma

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Hu, Xinliang, Jun Wang, Kaiping Yu, and Quande Chi. "Research on the influence of lubrication performance of hydrodynamic journal bearings based on orthogonal test method." Advances in Engineering Technology Research 1, no. 3 (2023): 775. http://dx.doi.org/10.56028/aetr.3.1.775.

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The orthogonal experiment design method is used based on analysis of lubrication of hydrodynamic journal bearing．The effect of structural parameters ( bearing diameter，wide diameter ratio and clearance ratio) and operating parameters ( linear velocity and specific pressure) on lubrication performance of hydrodynamic journal bearings is studied． The results show that the linear velocity and specific pressure have significant influence on maximum oil film pressure of the bearings．The influence of specific pressure and bearing diameter on load capacity of the bearings is significant．The bearing d

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Niccolini Marmont Du Haut Champ, Carlo Alberto, Fabrizio Stefani, and Paolo Silvestri. "Development of a new test rig for the analysis of hydrodynamic bearings for rotors of microGT." E3S Web of Conferences 113 (2019): 03002. http://dx.doi.org/10.1051/e3sconf/201911303002.

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The aim of the present work is to design a test rig suited to investigate the dynamic interaction between rotor and hydrodynamic journal bearings in micro gas turbines (microGT), i.e. with reference to small bearings (diameter in the order of ten millimeters). Particularly, the device is capable of measuring the journal location. Therefore, the journal motion due to rotor vibrations can be displayed, in order to assess performance as well as stiffness and damping of the bearings. The new test rig is based on Bently Nevada Rotor Kit (RK), but substantial modifications are carried out. Indeed, t

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Turaga, R., A. S. Sekhar, and B. C. Majumdar. "Stability analysis of a rigid rotor supported on hydrodynamic journal bearings with rough surfaces using the stochastic finite element method." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 212, no. 2 (1998): 121–30. http://dx.doi.org/10.1243/1350650981541949.

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The effect of surface roughness on the stability characteristics of hydrodynamic journal bearings has been studied. Roughness has been considered to be a stochastic variable, which is stationary, ergodic with mean zero. Both one-dimensional roughness (longitudinal and transverse) and two-dimensional roughness (isotropic) have been studied using the stochastic finite element method. Journal bearings with different width-diameter ratios have also been considered. It is seen that the transverse roughness tends to increase the stability (non-dimensional mass parameter) whereas in the case of isotr

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Guo Xiang, Guo Xiang, Yanfeng Han, Renxiang Chen, Jiaxu Wang Jiaxu Wang, and Ni Xiaokang. "A numerical method to investigate the mixed lubrication performances of journal-thrust coupled bearings." Industrial Lubrication and Tribology 71, no. 9 (2019): 1099–107. http://dx.doi.org/10.1108/ilt-02-2019-0063.

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Purpose This paper aims to present a numerical model to investigate the mixed lubrication performances of journal-thrust coupled bearings (or coupled bearings). Design/methodology/approach The coupled hydrodynamic effect (or coupled effect) between the journal and the thrust bearing is considered by ensuring the continuity of the hydrodynamic pressure and the flow field at the common boundary. The mixed lubrication performances of the coupled bearing are comparatively studied for the cases of considering and not considering coupled effect. Findings The simulated results show that the hydrodyna

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Wang, Yujun, Georg Jacobs, Florian König, Shuo Zhang, and Stephan von Goeldel. "Investigation of Microflow Effects in Textures on Hydrodynamic Performance of Journal Bearings Using CFD Simulations." Lubricants 11, no. 1 (2023): 20. http://dx.doi.org/10.3390/lubricants11010020.

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Adequately designed and positioned surface textures are recognized as a promising way to increase load-carrying capacity and reduce frictional losses of journal bearings. The aim of this work is to analyze the local lubrication mechanisms of textures in journal bearings from microflow perspective, while considering the interactions between textures and the film formation in the whole bearing. For this purpose, hydrodynamic lubrication models of textured journal bearings are built. The results show that placing textures downstream of the high-pressure region leads to a reduced friction force, w

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Miss., kale Priyanka Bhausaheb, and M.P. Nagarkar Prof. "DETERMINATION OF COEFFICIENT OF FRICTION OF HYDRODYNAMIC JOURNAL BEARING EXPERIMENTALLY." JournalNX - A Multidisciplinary Peer Reviewed Journal QIPCEI2K18 (May 1, 2018): 283–85. https://doi.org/10.5281/zenodo.1412413.

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Knowing friction coefficient is important for the determination of wear loss conditions at Journal bearings. Tribological events that influence wear & its variations effect experimental results. In this study, friction coefficient as example at radial bearings such as copper, brass hasbeen determined by a new approach .in experiment ,friction effect of bearing have been examined loads and velocities https://journalnx.com/journal-article/20150628

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Souchet, D., A. Senouci, H. Zaidi, and M. Amirat. "Numerical Analysis of a Hydrodynamic Herringbone Grooved Journal Bearing." Journal of Engineering 2020 (December 2, 2020): 1–12. http://dx.doi.org/10.1155/2020/3796214.

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In hydrodynamic lubrication, at very high rotational speed, the phenomenon of axial fluid leakage is often present. This can involve an increase of shear stress in the contact and consequently a considerable increase of the temperature. For that and in order to solve this problem, we took interest in the herringbone grooved journal bearings. The researches made before on these types of groove bearing have shown that they present a good dynamical behavior with a low eccentricity and a low axial flow. In this paper, a numerical study of a herringbone journal bearing operating behavior, under lam

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Snyder, Troy, and Minel Braun. "A CFD-Based Frequency Response Method Applied in the Determination of Dynamic Coefficients of Hydrodynamic Bearings. Part 1: Theory." Lubricants 7, no. 3 (2019): 23. http://dx.doi.org/10.3390/lubricants7030023.

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A general, CFD-based frequency response method for obtaining the dynamic coefficients of hydrodynamic bearings is presented. The method is grounded in experimental parameter identification methods and is verified for an extremely long, slider bearing geometry as well as short and long journal bearing geometries. The influence of temporal inertia on the dynamic response of the bearings is discussed and quantified through the inclusion of added mass coefficients within the mechanical models of the hydrodynamic bearing films. Methods to separate the dynamic stiffness into static stiffness and add

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Singh, Saurabh, and Mohd Zaheen Khan. "Analysis of hydrodynamic compliant journal bearings." Materials Today: Proceedings 46 (2021): 6650–54. http://dx.doi.org/10.1016/j.matpr.2021.04.109.

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Rho, Byoung-Hoo, and Kyung-Woong Kim. "Acoustical properties of hydrodynamic journal bearings." Tribology International 36, no. 1 (2003): 61–66. http://dx.doi.org/10.1016/s0301-679x(02)00132-9.

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ZHU, KE-QIN, and JIE PENG. "HYDRODYNAMIC CHARACTERISTICS OF ER FLUID FLOWS IN JOURNAL BEARINGS." International Journal of Modern Physics B 17, no. 01n02 (2003): 205–8. http://dx.doi.org/10.1142/s0217979203017345.

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A numerical analysis is performed on the hydrodynamic characteristics of electrorheological(ER) fluid flows in journal bearings based on the basic hydrodynamic equations. The flow field is assumed to be incompressible and isotropic, the Bingham plastic model is used to describe the behavior of ER fluids. The effect of bearing eccentricity ratio and applied electric field intensity has been studied attentively. It shows that control of the journal bearing through external electric field is much more feasible in high eccentricity ratio bearing than in low eccentricity ratio one.

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OLSZEWSKI, Artur, Jacek Igor ŁUBIŃSKI, Witold PAWLOS, and Bogdan KUŹBA. "OPERATING CONDITIONS OF SLIDE BEARINGS OF MILLS USED IN KGHM POLSKA MIEDŹ S.A." Tribologia 268, no. 4 (2016): 177–89. http://dx.doi.org/10.5604/01.3001.0010.6993.

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The paper contains the results from a technical analysis of the conditions of the operation of hydrodynamic bearings supporting the drums of ore processing mills at KGHM Polska Miedź S.A. A theoretical analysis was performed on the grounds of onsite examination and measurements of principal dimensions of the bearings of interest. The computer simulation covered the characteristics of the oil film in the bearings as a function of bearing clearance, load, lubricant viscosity, and journal tilting in relation to two planes (horizontal and vertical). The results of the analysis indicate that the be

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Betti, Alberto, Paola Forte, and Enrico Ciulli. "Turbulence Effects in Tilting Pad Journal Bearings: A Review." Lubricants 10, no. 8 (2022): 171. http://dx.doi.org/10.3390/lubricants10080171.

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This paper reviews the current knowledge on turbulence effects in tilting pad journal bearings. Turbulence is becoming increasingly important in the design of hydrodynamic bearings due to the trend to increase power density in turbomachines and consequently the operating speeds of the hydrodynamic bearings. Turbulence has a series of effects on the bearing performance which may be beneficial or detrimental, depending on the operating conditions. The main turbulence models are recalled and a historical overview on the evolution of numerical simulations of turbulent flow in tilting pad journal b

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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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Stefani, Fabrizio Antonio, Carlo Alberto Niccolini Marmont Du Haut Champ, Paolo Silvestri, and Aristide Fausto Massardo. "Experimental and Numerical Analysis of Torsional—Lateral Vibrations in Drive Lines Supported by Hydrodynamic Journal Bearings." Lubricants 12, no. 3 (2024): 82. http://dx.doi.org/10.3390/lubricants12030082.

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The driving and resistance torques of some rotating machinery for industrial applications are nonstationary and affect system dynamics. Under such operating conditions, coupling between torsional and lateral vibrations may become significant for drive lines supported by hydrodynamic bearings in particular design configurations. Indeed, the occurrence of fluid–structure interactions causes a reduction in the stability threshold of the journal bearings. A hypothesis based on Hopf bifurcation theory (HBT), which justifies how the coupling phenomenon develops, is validated by means of overall expe

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Miyanaga, Norifumi, and Jun Tomioka. "Investigations of Cylindrical and Conical Whirl Instabilities on Hydrodynamic Journal Bearings." Key Engineering Materials 656-657 (July 2015): 688–93. http://dx.doi.org/10.4028/www.scientific.net/kem.656-657.688.

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Hydrodynamic journal bearings induced serious shaft vibrations called oil whirl. Since they often give severe damages to the mechanical systems, it is important to fully understand the phenomenon to avoid the occurrence by the proper bearing design. This study theoretically and experimentally investigated both cylindrical and conical whirl instabilities, which can be appeared in journal bearings, and their relation was discussed. As the result, the span length of the bearings had a significant effect on the vibration mode. The transitional state in which the cylindrical and conical whirl insta

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Kumar, Paras, and Ashish Kumar Gupta. "Experimental Investigation on Hydrodynamic Journal Bearing using SAE 10W30 Multi Grade Oil." International Journal of Advance Research and Innovation 2, no. 1 (2014): 179–85. http://dx.doi.org/10.51976/ijari.211429.

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This paper presents an experimental study of pressure distribution on hydrodynamic journal bearing with SAE 10W30 multi grade oil. Hydrodynamic Journal bearing test rig (HJBTR) is used to test the 40 mm diameter and 40 mm long bearing (l/d = 1) made of Bronze. Test bearing is located between two antifriction bearings and loaded mechanically. The space between the shaft and the bearing is filled with SAE 10W30. A constant load of 800 N is applied at various journal rotational speeds of 1000, 1500, 2000 rpm. Various parameters like frictional torque, oil temperature and pressure at 10 different

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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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Singh, D. S., and B. C. Majumdar. "Computer-aided design of hydrodynamic journal bearings considering thermal effects." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 219, no. 2 (2005): 133–39. http://dx.doi.org/10.1243/135065005x9772.

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A computer-aided design of hydrodynamic journal bearings is provided considering thermal effects. The Reynolds equation has been solved simultaneously along with the energy equation and heat conduction equations in bush and shaft to obtain the steady-state solution. Using the steady-state solution, a computer-aided design of such bearings is given. In this process, a data bank is generated that consists of load, friction factor and flow rate for different L/D and eccentricity ratios. These data are curve fitted to derive empirical relations for steady-state characteristics. These equations wer

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Muchammad Muchammad, Mohammad Tauviqirrahman, Dhia Danu, Budi Setiyana, and J. Jamari. "Thermo-hydrodynamic Analysis of Multistep Journal Bearing using Computational Fluid Dynamics Simulation." CFD Letters 15, no. 12 (2023): 117–34. http://dx.doi.org/10.37934/cfdl.15.12.117134.

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Journal bearing is a machine element that is used to maintain the continuous rotation of the shaft on its axis. The rising demand for efficient and economical journal bearing applications has resulted in increased demand for high-speed machines. An increase in engine speed raises the distribution of pressure, temperature, and vapor volume fraction. Most of the research still only focuses on increasing pressure distribution and load-carrying capacity. However, the value of friction force, temperature distribution, and vapor volume fraction must also be considered such that the lubrication of th

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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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