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Journal articles on the topic 'Hybrid fluid bearings'

Author: Grafiati

Published: 4 June 2021

Last updated: 2 February 2022

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1

Polyakov, Roman, Leonid Savin, and Denis Shutin. "Reliability Improvement of Rotor Supports by Combining Rolling-Element Bearings and Fluid-Film Bearings." Applied Mechanics and Materials 630 (September 2014): 188–98. http://dx.doi.org/10.4028/www.scientific.net/amm.630.188.

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Reliability of rotating machinery is determined to a considerable degree by the bearing units. For several applications the requirements in rotation speed, bearing load and maximal vibration level are so extreme that neither rolling-element bearings nor fluid-film bearings could provide necessary performance characteristics during all regimes of operation. Hybrid bearings, which are a combination of rolling-element and fluid-film bearings, can improve performance characteristics and reliability of the rotor-bearing systems. The aim of this work is to analyze the advantages and disadvantages of

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2

Polyakov, Roman, Leonid Savin, and Alex Fetisov. "Analysis of the conditions for the occurrence of the effect of a minimum of friction in hybrid bearings based on the load separation principle." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 2 (2018): 271–80. http://dx.doi.org/10.1177/1350650118777143.

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Reliability of rotating machinery is determined to a considerable degree by the bearing units. For several applications the requirements in rotational speed, bearing load and maximal vibration level are so extreme that neither rolling-element bearings nor fluid-film bearings could provide necessary operating characteristics during all regimes of operation. Hybrid bearings, which are a combination of rolling-element and fluid-film bearings, can improve performance characteristics and reliability of the rotor-bearing systems. A hybrid bearing, where a rolling-element bearing and a fluid-film bea

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3

San Andre´s, Luis. "Turbulent Hybrid Bearings With Fluid Inertia Effects." Journal of Tribology 112, no. 4 (1990): 699–707. http://dx.doi.org/10.1115/1.2920318.

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High speed hybrid bearings for cryogenic applications demand large levels of external pressurization to provide substantial load capacity. These conditions give rise to large film Reynolds numbers, and thus, cause the fluid flow within the bearing film to be turbulent and dominated by fluid inertia effects both at the recess edges and at the thin film lands. The analysis includes the effect of recess fluid compressibility and a model for the pressure rise within the recess region. Flow turbulence is simulated by friction factors dependent on the local Reynolds numbers and surface conditions. A

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4

Fedorynenko, Dmytro, Serhii Sapon, Sergiy Boyko, and Anastasiia Urlina. "Increasing of Energy Efficiency of Spindles with Fluid Bearings." Acta Mechanica et Automatica 11, no. 3 (2017): 204–9. http://dx.doi.org/10.1515/ama-2017-0031.

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AbstractPromising ways of energy efficiency gain of spindles with fluid flow bearings are offered. New design of journal hybrid flow bearing which contains spherical bearing pockets and adjustable valves with relay control system is offered to improve energy efficiency of spindle units of machine tools. To reduce power losses of fluid bearings at high speed special lubrication based on water with integrated system of corrosion protection is offered. Results of theoretical research of energy consumption of grinding machine tool with a new design of spindle hybrid bearings are presented. Power l

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5

Xiu, Shi Chao, Shi Qiang Gao, and Zhi Li Sun. "Study on Thermal Properties of Hybrid Journal Bearing for Super High Speed Grinding Machine." Advanced Materials Research 126-128 (August 2010): 808–13. http://dx.doi.org/10.4028/www.scientific.net/amr.126-128.808.

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As the high speed bearings, hybrid journal bearings are usually used in high and super high speed grinding machine spindle system. Since the bearing operates under high speed conditions, the excessive temperature rise of bearing is a key factor to lower the accuracy of the spindle system and limit the bearings working speed, so restrict the bearing applications. In this paper, the model of hybrid journal bearing is established to analyze the heat mechanism. In addition, the temperature field distribution for the certain hybrid journal bearing at high speed is studied by ANSYS considering the h

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6

San Andre´s, Luis. "Bulk-Flow Analysis of Hybrid Thrust Bearings for Process Fluid Applications." Journal of Tribology 122, no. 1 (1999): 170–80. http://dx.doi.org/10.1115/1.555340.

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Advanced cryogenic fluid turbopumps are very compact, operate at extremely high shaft speeds, and require hybrid (hydrostatic/hydrodynamic) radial and thrust fluid film bearings for accurate rotor positioning. Sound design and reliable operation of fluid film thrust bearings also allows for unshrouded impellers with a significant increase in the turbopump mechanical efficiency. A bulk-flow analysis for prediction of the static load performance and dynamic force coefficients of high speed, angled injection orifice-compensated, hybrid (hydrostatic/hydrodynamic) thrust bearings is presented. The

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7

Wang, Jian, Jing Feng Shen, and Ya Wen Fan. "Static characteristics analysis of spherical hybrid sliding bearings." Industrial Lubrication and Tribology 72, no. 1 (2019): 93–100. http://dx.doi.org/10.1108/ilt-06-2019-0213.

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Purpose The spherical hybrid sliding bearings (SHSBs) can be used in ultra-precision and heavy-duty machine tools. However, there is little related research for these bearings. The purpose of this study is to investigate the static characteristics and effect factors affecting SHSBs by fluid lubrication. Design/methodology/approach Based on the theories of fluid lubrication, the Reynolds equation of general Newtonian fluid is derived to obtain the steady-state lubrication equation. The system is solved by the finite difference method and the relaxation iterative method on the staggered grid to

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8

San Andre´s, Luis. "Effects of Misalignment on Turbulent Flow Hybrid Thrust Bearings." Journal of Tribology 124, no. 1 (2001): 212–19. http://dx.doi.org/10.1115/1.1400997.

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An extended computational bulk-flow analysis for prediction of performance in angled injection, orifice-compensated hydrostatic/hydrodynamic thrust bearings is presented. The fluid motion within the thin film lands is governed by mass conservation and momentum transport equations. Mass flow conservation and a simple model for momentum transport within the hydrostatic bearing recesses are also accounted for. A perturbation analysis for small amplitude shaft axial motions and angulations leads to zeroth and first-order equations describing the equilibrium and perturbed fluid flows. The computati

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9

Xiu, Shi Chao, Shi Qiang Gao, and Zhi Li Sun. "Analysis of Thermal Properties of Super-High Speed Hybrid Journal Bearing Based on ANSYS." Advanced Materials Research 118-120 (June 2010): 753–57. http://dx.doi.org/10.4028/www.scientific.net/amr.118-120.753.

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Hybrid journal bearings are used in the high and super high speed cases mainly, such as the super-high speed spindle system. Since the bearing operates under high speed conditions, the excessive temperature rise of the bearing is a major reason to lower the accuracy of the main shaft system and limit the bearings working speed higher, as a result, restrict the bearing applications. In this paper, the thermal properties and the heat mechanism of such bearings are analyzed. The mathematical model of hybrid journal bearing is established to analyze the mechanism of generating heat. In addition, t

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10

Laurant, Franck, and Dara W. Childs. "Rotordynamic Evaluation of a Near-Tangential-lnjection Hybrid Bearing." Journal of Tribology 121, no. 4 (1999): 886–91. http://dx.doi.org/10.1115/1.2834151.

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Given the inherent DN and assembly limitations of rolling-element bearings, research is underway to develop hybrid bearings (combining hydrostatic and hydrodynamic effects) for their replacement. Hybrid bearings develop cross-coupled stiffness coefficients due to fluid rotation, leading to predictions of onset speeds of instability and potential limitations in their range of application. Injecting fluid into a bearing recess against rotation, versus the customary radial injection, can reduce the circumferential flow and the cross-coupled-stiffness coefficients, and increase the margin of stabi

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11

Heshmat, H., H. Ming Chen, and J. F. Walton,. "On the Performance of Hybrid Foil-Magnetic Bearings." Journal of Engineering for Gas Turbines and Power 122, no. 1 (1999): 73–81. http://dx.doi.org/10.1115/1.483178.

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Recent technological advancements make hybridization of the magnetic and foil bearings both possible and extremely attractive. Operation of the foil/magnetic bearing takes advantage of the strengths of each individual bearing while minimizing each other’s weaknesses. In this paper one possible hybrid foil and magnetic bearing arrangement is investigated and sample design and operating parameters are presented. One of the weaknesses of the foil bearings, like any hydrodynamic bearing, is that contact between the foil bearing and the shaft occurs at rest or at very low speeds and it has low load

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12

Chen, S. H., and C. D. Mote. "On Parallel Hybrid Guide Bearings Under Combined Sliding and Small Amplitude Vibration." Journal of Tribology 116, no. 1 (1994): 127–32. http://dx.doi.org/10.1115/1.2927027.

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An original hybrid bearing model, operating under constant volumetric incompressible lubricant supply rate Q*, is proposed for 2-D parallel hybrid guide bearings subject to simultaneous translation and small amplitude transverse vibration. The model may describe the typical fluid film constrained between a translating/rotating saw blade and a saw guide, where lubricant is fed directly into the oscillating film. The inner boundary, or recess, pressure is time varying and coupled to the external lubricant supply. Unsteady fluid inertia resulting from vibration is measured by the squeeze Reynolds

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13

Babin, Alexander, Leonid Savin, and Sergey Majorov. "Dynamic Characteristics of Rotors on Passive and Active Thrust Fluid-film Bearings with Fixed Pads." MATEC Web of Conferences 148 (2018): 11003. http://dx.doi.org/10.1051/matecconf/201814811003.

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Application of fluid-film bearings in rotor machines in many cases could have no alternative due to obvious advantages when compared to roller element bearings. Integration of information technology in mechanical engineering resulting in emergence of a new field of research – mechatronic bearings which allowed tracking condition of the most important parts of a machine and adjusting operational parameters of the system. Application of servo valves to control the flow rate through a fluid-film bearing is the most universal and simple way of rotor’s position control due to relative simplicity of

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14

Kumar, Vivek, Satish C. Sharma, and Kuldeep Narwat. "Influence of micro-groove attributes on frictional power loss and load-carrying capacity of hybrid thrust bearing." Industrial Lubrication and Tribology 72, no. 5 (2019): 589–98. http://dx.doi.org/10.1108/ilt-07-2019-0278.

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Purpose Micro-surface texturing is emerging as a possible way to enhance the tribological performance of hydrodynamic fluid film bearings. In view of this, numerical simulations are carried out to examine the influence of surface texture on performance of hybrid thrust bearing system. This paper aims to determine optimum attributes of micro-grooves for thrust bearing operating in hybrid mode. Design/methodology/approach An iterative source code based on finite element formulation of Reynolds equation has been developed to numerically simulate flow of lubricant through the bearing. Mass-conserv

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15

Guoyuan, Zhang, and Yan Xiu-Tian. "Analysis of two phase flow in liquid oxygen hybrid journal bearings for rocket engine turbopumps." Industrial Lubrication and Tribology 66, no. 1 (2014): 31–37. http://dx.doi.org/10.1108/ilt-09-2011-0072.

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Purpose – A hybrid bearing of advanced cryogenic rocket engine turbopump is designed. For cryogenic fluid propellants (such as liquid oxygen) as the lubrication of bearing, bearings operating close to liquid-vapor region (near the critical point or slightly sub-cooled) are likely to develop a two phase flow region. The paper aims to discuss these issues. Design/methodology/approach – In this paper, an all liquid, liquid-vapor mixture, and all vapor, i.e. a continuous vaporization bulk flow model of density and viscosity for mixture fluid, is presented, and the general Reynolds equation and ene

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16

Polyakov, R. "Interaction of Rolling-Element and Fluid-Film Bearings Dynamic Characteristics in Hybrid Bearings." Procedia Engineering 206 (2017): 61–67. http://dx.doi.org/10.1016/j.proeng.2017.10.438.

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17

Santos, Ilmar Ferreira, and Fla´vio Yukio Watanabe. "Compensation of Cross-Coupling Stiffness and Increase of Direct Damping in Multirecess Journal Bearings Using Active Hybrid Lubrication: Part I—Theory." Journal of Tribology 126, no. 1 (2004): 146–55. http://dx.doi.org/10.1115/1.1631015.

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Fluid film forces are generated in hydrostatic journal bearings by two types of lubrication mechanisms: the hydrostatic lubrication in the bearing recesses and hydrodynamic lubrication in the bearing lands, when operating in rotation. The combination of both lubrication mechanisms leads to hybrid journal bearings (HJB). When part of hydrostatic pressure is also dynamically modified by means of hydraulic control systems, one refers to the active lubrication. The main contribution of the present theoretical work is to show that it is possible to reduce cross-coupling stiffness and increase the d

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18

Urreta, Harkaitz, Gorka Aguirre, Pavel Kuzhir, and Luis Norberto Lopez de Lacalle. "Actively lubricated hybrid journal bearings based on magnetic fluids for high-precision spindles of machine tools." Journal of Intelligent Material Systems and Structures 30, no. 15 (2019): 2257–71. http://dx.doi.org/10.1177/1045389x19862358.

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The research work reported in this article is focused on the use of magnetic fluids as active lubricant for improving the performance of hybrid journal bearings, with application to high-precision machine tools. Prototype design was optimized following numerical computation of Reynolds equation and computational fluid dynamics calculations, in both cases with Herschel–Bulkley model for the magnetorheological fluid. This fluid (LORD Corp. MRF 122-2ED) was experimentally characterized in detail. The improvement of the hydrodynamic effect in journal bearings was demonstrated with 50% higher load

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19

Savin, Leonid A., Alexey V. Kornaev, and Elena P. Kornaeva. "Influence of Critical Flow Rates on Characteristics of Enforced and Shear Flows in Circular Convergent-Divergent Channels." International Journal of Rotating Machinery 2017 (2017): 1–8. http://dx.doi.org/10.1155/2017/8761375.

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Analysis of the reasons of critical flow rate occurrence in hydraulic tracts of cryogenic machines has been carried out. Theoretical expressions have been derived to calculate critical velocities in a boiling multiphase medium. Applied to hybrid fluid-film bearings with throttles for lubricant supply, a mathematical model has been developed to calculate pressure distribution and hydrodynamic reaction forces of a lubricant considering the influence of steam content and critical flows in throttle devices. Numerical results of phase state and load capacity calculations of a hybrid fluid-film bear

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20

Santos, I. F., and R. Nicoletti. "THD Analysis in Tilting-Pad Journal Bearings Using Multiple Orifice Hybrid Lubrication." Journal of Tribology 121, no. 4 (1999): 892–900. http://dx.doi.org/10.1115/1.2834152.

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Tilting pad journal bearings (TPJB) using multiple orifice hybrid lubrication are analyzed applying a thermohydrodynamic (THD) theory. Adiabatic boundary conditions are adopted, and a two-dimensional model is used to represent the fluid flow behavior in the bearing gap. The influence of operational conditions on the temperature distribution and on the bearing load capacity is discussed and compared to theoretical and experimental values for a conventional hydrodynamic case (without radial oil injection). To improve the cooling effects, as well as rotor attitudes, the best location for orifices

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21

Li, Da Ying. "Study on CFD Solution Method for Static Characteristics of Hybrid Oil Film Bearing." Applied Mechanics and Materials 155-156 (February 2012): 236–40. http://dx.doi.org/10.4028/www.scientific.net/amm.155-156.236.

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Reynolds equation is the fundamental equation to solve the static performance for sleeve bearings. For hydrodynamic and hydrostatic oil film bearing with three oil recesses, the specific expressions of the fluid mechanics lubrication Reynolds equation are presented. The gridding model of the bearing is proposed, the boundary condition of the bearing is set, the static characteristics are solved and the pressure distribution of the bearing is plotted by using FLUENT software. The computation results from FLUENT are considerably accordance with the computation results from finite difference meth

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22

San Andres, Luis, and Dara Childs. "Angled Injection—Hydrostatic Bearings Analysis and Comparison to Test Results." Journal of Tribology 119, no. 1 (1997): 179–87. http://dx.doi.org/10.1115/1.2832455.

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Hydrostatic/hydrodynamic (hybrid) journal bearings handling process liquids have limited dynamic stability characteristics and their application as support elements to high speed flexible rotating systems is severely restricted. Measurements on water hybrid bearings with angled orifice injection have demonstrated improved rotordynamic performance with virtual elimination of cross-coupled stiffness coefficients and null or negative whirl frequency ratios. A bulk-flow model for prediction of the static performance and force coefficients of hybrid bearings with angled orifice injection is advance

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23

San Andre´s, Luis. "Approximate Analysis of Turbulent Hybrid Bearings. Static and Dynamic Performance for Centered Operation." Journal of Tribology 112, no. 4 (1990): 692–98. http://dx.doi.org/10.1115/1.2920317.

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An analytical study for the flow and dynamic force response in turbulent hybrid journal bearings is presented. Fluid inertia effects at the recess edges and film lands are included. For small amplitude motions about the centered position, the equations for the flow on the film lands and recesses are solved in close form by invoking the thin-land assumption. Predictions from the present simplified analytical theory agree well with full numerical predictions. The effect of recess pressure on the dynamic force response of a L02 hybrid bearing is discussed in detail.

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24

Bou-Said, B., and J. P. Chaomleffel. "Hybrid Journal Bearings: Theoretical and Experimental Results." Journal of Tribology 111, no. 2 (1989): 265–69. http://dx.doi.org/10.1115/1.3261903.

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The analysis of actual lubrication problems needs to take into account particularities in the flow coming from kinematic conditions and contact geometry. For hybrid journal bearings lubricated by low dynamic viscosity fluid, turbulence and pressure drops due to inertia forces in the recess outlets are phenomena which must be taken into account to compute their working characteristics. A global method of study of lubricated contacts in isothermal laminar or not laminar flow by finite element method is presented. It can solve a great number of lubrication problems. A new type of approximation el

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Khatak, Pankaj, and H. C. Garg. "Performance comparison of hole-entry and slot entry hybrid journal bearings considering combined influence of thermal effects and micropolar lubricant." Industrial Lubrication and Tribology 70, no. 6 (2018): 1037–50. http://dx.doi.org/10.1108/ilt-01-2017-0023.

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Purpose Hybrid journal bearing have long been used in machines requiring large load and high speed capacity operating under wide range of temperatures. Different compensating devices are used in for efficient operation of bearings. This paper aims to help in selection of optimum compensating device by evaluating the comparative performance of constant flow valve, capillary compensated and slot entry hybrid journal bearing under the combined influence of thermal effects and micropolar nature of lubricant. Design/methodology/approach The variation in micropolar parameters and viscosity change du

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Koltsov, A., A. Prosekova, A. Rodichev, and L. Savin. "Influence of technological factors on characteristics of hybrid fluid-film bearings." IOP Conference Series: Materials Science and Engineering 233 (August 2017): 012044. http://dx.doi.org/10.1088/1757-899x/233/1/012044.

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27

Garg, H. C., and Vijay Kumar. "Thermohydrostatic rheological analysis of constant flow valve compensated multiple hole-entry hybrid journal bearings." Industrial Lubrication and Tribology 66, no. 2 (2014): 244–59. http://dx.doi.org/10.1108/ilt-10-2012-0114.

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Purpose – The changing technological scenario necessitated hybrid journal bearings to operate under severe conditions of heavy load and high speed resulting into temperature rise of the lubricant fluid-film and bearing surface. To predict the performance of a bearing realistically, theoretical model must consider the combined influence of the rise of temperature and non-Newtonian behavior of the lubricant. The aim of the present paper is to study the effect of viscosity variation due to temperature rise and non-Newtonian behavior of the lubricant on performance of constant flow valve compensat

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28

Sahu, Krishnkant, and Satish C. Sharma. "Magneto-rheological fluid slot-entry journal bearing considering thermal effects." Journal of Intelligent Material Systems and Structures 30, no. 18-19 (2019): 2831–52. http://dx.doi.org/10.1177/1045389x19873401.

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In recent times, controlling the performance of fluid film bearings smartly has become an important area for the fluid film bearing designers. This study deals with the numerical simulation of a magneto-rheological fluid–lubricated two-lobe hybrid slot-entry journal bearing. To make the operating condition more exact and realistic, the influence of geometric imperfection of the journal arising from manufacturing inaccuracies and thermal effect has been considered. Dave magneto-rheological fluid model, a constitutive relation of the Bingham model, and finite element method have been used in thi

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Jia, Chenhui, Zhiwu Cui, Shijun Guo, and Wensuo Ma. "Research on dynamic characteristics of gas film of spherical hybrid gas bearings based on computational fluid dynamics." Transactions of the Canadian Society for Mechanical Engineering 44, no. 1 (2020): 23–37. http://dx.doi.org/10.1139/tcsme-2018-0134.

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A realizable k–ε turbulence model for spherical spiral groove hybrid gas bearing films was established based on computational fluid dynamics (CFD). A six degrees of freedom passive grid was used to calculate the gas film pressure distribution, bearing capacity, and dynamic characteristic coefficients numerically. The gas flow field dynamic and static pressure coupling mechanism was studied. The effects of the rotation speed, gas film thickness eccentricity ratio, and gas supply pressure on the dynamic and static pressure bearing capacity, and dynamic characteristic coefficients during operatio

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Guha, S. K., M. K. Ghosh, and B. C. Majumdar. "Rotordynamic coefficients of multirecess hybrid journal bearings Part II: Fluid inertia effect." Wear 129, no. 2 (1989): 261–72. http://dx.doi.org/10.1016/0043-1648(89)90263-9.

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31

SHUTIN, D. V., A. S. FETISOV, YU N. KAZAKOV, and A. YU BABIN. "EXPERIMENTAL COMPLEX FOR STUDYING FRICTION IN ACTIVE JOURNAL BEARINGS." Fundamental and Applied Problems of Engineering and Technology 6 (2020): 77–85. http://dx.doi.org/10.33979/2073-7408-2020-344-6-77-85.

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One of the most important characteristics taken into account when designing machines is their efficiency. Active fluid-film bearings are able to influence tribological processes and reduce frictional energy, which increases the efficiency of the machine. For experimental determination of friction and verification of simulation results, an experimental complex was created, which makes it possible to directly measure the moment of friction force in active journal bearings. The complex is based on a rotor-bearing system with a rigid rotor on one active and one passive bearing. The information-mea

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Nagaraju, T., Satish C. Sharma, and S. C. Jain. "Influence of Surface Roughness on Non-Newtonian Thermohydrostatic Performance of a Hole-Entry Hybrid Journal Bearing." Journal of Tribology 129, no. 3 (2007): 595–602. http://dx.doi.org/10.1115/1.2736451.

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A general solution scheme to account the surface roughness and the cross-film viscosity variation of lubricant due to its non-Newtonian behavior and rise in fluid-film temperature for the analysis of fluid-film bearings is presented. The combined influence of surface roughness, non-Newtonian behavior of lubricant, and thermal effects on the performance of a hole-entry hybrid journal bearing system has been investigated. The surface roughness, especially stationary roughness (i.e., rough bearing and smooth journal) with a transverse pattern was found to partially compensate for the loss in load

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Pawar, Sanjay R., and Vikas M. Phalle. "Effect of wear on the performance of hole entry hybrid conical journal bearing employing constant flow valve compensation." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 233, no. 9 (2019): 1277–92. http://dx.doi.org/10.1177/1350650119838078.

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Hybrid bearings gets worn gradually during the start and stop operation. This wearing leads to change in the geometry of bearing and affects the radical clearance as well as fluid film thickness. Therefore, these discontinuities in the radial clearance can influence the performance characteristics. With the purpose of preventing irreparable failure state of bearing assembly, it is essential to concentrate on the actual changes in the performance parameters of hole entry hybrid conical journal bearing due to wear. In this context, the main aim of this analysis is to predict the performance of h

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Khatri, Chandra B., and Satish C. Sharma. "Influence of couple stress lubricant on the performance of textured two-lobe slot-entry hybrid journal bearing system." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 3 (2016): 366–84. http://dx.doi.org/10.1177/1350650116658377.

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This paper concerns with theoretical investigation to predict the combined influence of textured surface and couple stress lubricant behavior on the performance of circular/two-lobe slot-entry hybrid journal bearing. The flow of incompressible couple stress lubricant through the clearance of a textured journal bearing system is governed by the modified Reynolds equation. The modified Reynolds equation has been derived on the basis of Stokes micro-continuum theory and is solved using a finite element method technique for computing the bearing performance characteristics parameters. The static a

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Shutin, Denis, Leonid Savin, and Alexander Babin. "A Review on Active Bearings and Perspectives of Using Them in Rotating Machinery." Applied Mechanics and Materials 630 (September 2014): 181–87. http://dx.doi.org/10.4028/www.scientific.net/amm.630.181.

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The paper examines the issues of improving the rotor units by means of using support units with actively changeable characteristics. An overview of the known solutions related to the use of active bearings in various types of turbomachinery is provided. A closer look is given at the design and features of active radial bearings, the main elements of which are fluid film bearings. The results of mathematical modeling of active hybrid bearings are presented. The prospects of the use of this type of supports to improve the dynamic characteristics of rotating machinery, including reducing vibratio

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MIYAJI, Ryutaro, and Yuuji WATANABE. "The Shaft Response Characteristics of Hybrid Type Hydrostatic Journal Gas Bearings with Fluid Damper." Journal of the Japan Society for Precision Engineering 63, no. 2 (1997): 203–7. http://dx.doi.org/10.2493/jjspe.63.203.

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San Andres, L. A. "Analysis of Hydrostatic Journal Bearings With End Seals." Journal of Tribology 114, no. 4 (1992): 802–11. http://dx.doi.org/10.1115/1.2920952.

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An approximate analysis for the pressure field and dynamic force coefficients in turbulent flow, centered hydrostatic journal bearings (HJBs) with fluid inertia and liquid compressibility effects is presented. Results from the analysis show that HJBs with end seals have increased damping, better dynamic stability characteristics, as well as lower flow rates, than conventional HJBs. However, hydrostatic (direct) stiffness may be lost if excessively tight end seals are used. End seals are shown to compensate for the effect of liquid compressibility within the recess volume, and prescribe a net r

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Chander Garg, Hem, and Vijay Kumar. "Comparison of static performance characteristics of different configurations of slot-entry hybrid journal bearing operating with non-Newtonian lubricants." Industrial Lubrication and Tribology 66, no. 1 (2014): 38–45. http://dx.doi.org/10.1108/ilt-10-2012-0113.

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Purpose – The slot-entry hybrid journal bearings have been successfully used in various engineering applications because of their good performance over wide range of speed and load, besides their relative simplicity in manufacturing. Most of the research work pertaining to non-recessed journal bearing assumes standard symmetric and asymmetric configurations. However, many more configurations are possible by changing the position of slot which may improve the performance of the slot-entry journal bearing. In the present work study of static performance characteristics of slot-entry journal bear

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Guo, Zenglin, Toshio Hirano, and R. Gordon Kirk. "Application of CFD Analysis for Rotating Machinery—Part I: Hydrodynamic, Hydrostatic Bearings and Squeeze Film Damper." Journal of Engineering for Gas Turbines and Power 127, no. 2 (2005): 445–51. http://dx.doi.org/10.1115/1.1807415.

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The traditional method for bearing and damper analysis usually involves a development of rather complicated numerical calculation programs that may just focus on a simplified and specific physical model. The application of the general CFD codes may make this analysis available and effective where complex flow geometries are involved or when more detailed solutions are needed. In this study, CFX-TASCflow is employed to simulate various fixed geometry fluid-film bearing and damper designs. Some of the capabilities in CFX-TASCflow are applied to simulate the pressure field and calculate the stati

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Ghosh, M. K., and N. S. Viswanath. "Recess Volume Fluid Compressibility Effect on the Dynamic Characteristics of Multirecess Hydrostatic Journal Bearings With Journal Rotation." Journal of Tribology 109, no. 3 (1987): 417–26. http://dx.doi.org/10.1115/1.3261462.

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An analysis using finite difference method and small amplitude perturbation technique has been presented to evaluate the frequency dependent stiffness and damping coefficients of multirecess hydrostatic journal bearings including the effect of shaft rotation that results in hybrid operation. Recess volume fluid compressibility effect that results in the frequency dependent dynamic coefficients have been taken into account. Results for direct and cross stiffness coefficients, direct and cross damping coefficients are presented for a capillary compensated bearing with deep recesses. Frequency ef

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41

Franchek, Nancy M., Dara W. Childs, and Luis San Andres. "Theoretical and Experimental Comparisons for Rotordynamic Coefficients of a High-Speed, High-Pressure, Orifice-Compensated Hybrid Bearing." Journal of Tribology 117, no. 2 (1995): 285–90. http://dx.doi.org/10.1115/1.2831244.

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Comparisons are presented between measurements and predictions for a 76.2 mm diameter, high-speed (24,600 rpm), high-pressure (7.0 MPa), hybrid bearings using warm (54°C) water as a test fluid. “Hybrid” refers to combined hydrostatic and hydrodynamic action. Test results are presented for an orifice-fed, square-recess configuration with five recesses. Data are provided for rotordynamic coefficients including direct and cross-coupled stiffness, direct damping, direct added-mass coefficients, and the whirl-frequency ratio. Experimental results are compared to predictions from an analysis by San

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42

Saucedo-Dorantes, Juan-Jose, Israel Zamudio-Ramirez, Jonathan Cureno-Osornio, Roque Alfredo Osornio-Rios, and Jose Alfonso Antonino-Daviu. "Condition Monitoring Method for the Detection of Fault Graduality in Outer Race Bearing Based on Vibration-Current Fusion, Statistical Features and Neural Network." Applied Sciences 11, no. 17 (2021): 8033. http://dx.doi.org/10.3390/app11178033.

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Bearings are the elements that allow the rotatory movement in induction motors, and the fault occurrence in these elements is due to excessive working conditions. In induction motors, electrical erosion remains the most common phenomenon that damages bearings, leading to incipient faults that gradually increase to irreparable damages. Thus, condition monitoring strategies capable of assessing bearing fault severities are mandatory to overcome this critical issue. The contribution of this work lies in the proposal of a condition monitoring strategy that is focused on the analysis and identifica

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Budheeja, Kamal, and Suresh Verma. "Nonlinear transient analysis of hole-entry journal bearing with constant flow of micropolar fluids." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 1 (2018): 350–68. http://dx.doi.org/10.1177/0954406218756942.

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The present work deals with study and analysis of a symmetric hybrid journal bearing compensated with constant flow valve restrictor operating with micropolar fluid from stability point of view. The effect of micropolar parameters on the stability of this journal bearing system is presented on the basis of nonlinear transient model. Finite element method has been used to solve modified Reynolds’ equation for the flow of micropolar fluid through the bearing. Computations are done for the static and dynamic characteristics of hole-entry hybrid journal bearing system. The stability characteristic

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Song, Lin, Liping Wang, Jun Wu, Jianhong Liang, and Zhigui Liu. "Integrating Physics and Data Driven Cyber-Physical System for Condition Monitoring of Critical Transmission Components in Smart Production Line." Applied Sciences 11, no. 19 (2021): 8967. http://dx.doi.org/10.3390/app11198967.

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In response to the lack of a unified cyber–physical system framework, which combined the Internet of Things, industrial big data, and deep learning algorithms for the condition monitoring of critical transmission components in a smart production line. In this study, based on the conceptualization of the layers, a novel five-layer cyber–physical systems framework for smart production lines is proposed. This architecture integrates physics and is data-driven. The smart connection layer collects and transmits data, the physical equation modeling layer converts low-value raw data into high-value f

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Kumar, Vijay, Satish C. Sharma and, and S. C. Jain. "Stability Margin of Hybrid Journal Bearing: Influence of Thermal and Elastic Effects." Journal of Tribology 126, no. 3 (2004): 630–34. http://dx.doi.org/10.1115/1.1759343.

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This paper deals with the stability margin of a constant flow valve compensated hole-entry hybrid journal bearing system considering bearing flexibility and variation of viscosity due to temperature rise of the lubricant. The journal temperature is computed on the basis of average fluid-film temperature and axisymmetric isothermal element is assumed. The coupled solution of Reynold’s, energy, conduction, and elasticity equations is obtained using finite element method. The performance of a symmetric and asymmetric hole-entry hybrid journal bearing configurations is studied. The results present

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Khakse, Prashant G., Vikas M. Phalle, and SS Mantha. "Orifice compensated performance characteristics of hybrid hole-entry conical journal bearing." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 3 (2016): 316–31. http://dx.doi.org/10.1177/1350650116654803.

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Influence of semi-cone angles on the performance of the non-recessed hybrid/hydrostatic hole-entry conical journal bearing compensated with orifice restrictor has been carried out analytically. The analysis comprises two rows of symmetric hole-entry contour in the circumferential direction of hybrid/hydrostatic conical journal bearing. An orifice restrictor is used in the hole-entry contour to allow the restricted flow in the clearance space of a journal and bearing. Well-known finite element method and Newton–Raphson method for restrictor have been used to solve the Reynolds equation, governi

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Słaby, E., K. Gros, H. J. Förster, et al. "Mineral–fluid interactions in the late Archean Closepet granite batholith, Dharwar Craton, southern India." Geological Society, London, Special Publications 489, no. 1 (2019): 293–314. http://dx.doi.org/10.1144/sp489-2019-287.

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AbstractThe chemical composition of different rocks as well as volatile-bearing and volatile-free minerals has been used to assess the presence of fluids in the Closepet batholith and to estimate the intensity of the fluid–rock interactions. The data were processed using polytopic vector analysis (PVA). Additional data include measurements of water content in the structure of volatile-free minerals and an examination of growth textures. The composition of mineral domains indicated formation/transformation processes with common fluid–mineral interactions. In general, the results suggested that

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Tomar, Adesh K., and Satish C. Sharma. "Finite element analysis of multirecess hybrid spherical journal bearing system." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 11 (2019): 1798–821. http://dx.doi.org/10.1177/1350650119884829.

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The present work deals with finite element method analysis of a multirecess hybrid spherical journal bearing system. The governing equations have been discretized using Galerkin’s technique and are solved simultaneously using a suitable iterative technique. The effect of span angle on the static and dynamic behavior of a hybrid spherical journal bearing compensated with membrane restrictor is investigated in the present work. Numerical results indicate that larger values of span angle provide enhanced value of minimum fluid-film thickness [Formula: see text], reduced lubricant flow requirement

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CHEN, Shujiang. "Fluid flow separation character on novel hybrid journal bearing." Chinese Journal of Mechanical Engineering (English Edition) 19, no. 04 (2006): 540. http://dx.doi.org/10.3901/cjme.2006.04.540.

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von der Beeke, Birte, Angela Ries, Klaus Dröder, and Georg-Friedrich Lührs. "Media-tight Hybrid Composites for Fluid-bearing Housing Structures." Lightweight Design worldwide 11, no. 5 (2018): 36–41. http://dx.doi.org/10.1007/s41777-018-0044-6.

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