Journal articles: 'Bearing capacity'

1

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. What’s more, the improvement is more obvious when the number of waves is 3, also it has wider carrying area. Compared with other journal bearings, the journal bearing with sinusoidal surfaces has stronger carrying capacity, smaller friction moment and longer life-span. Therefore, it has extensive prospect.

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Goodwin, M. J., P. J. Ogrodnik, M. P. Roach, L. K. Lim, and Y. Fang. "Steady Load-Carrying Capacity of Recessed Hydrodynamic Bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 209, no. 4 (December 1995): 255–62. http://dx.doi.org/10.1243/pime_proc_1995_209_436_02.

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Oil-film hydrodynamic bearings are one of the most common forms of bearing used in rotating machinery. Because of their effect on system unbalance response and stability, care has to be exercised in the design of machines running in hydrodynamic bearings—for example they cannot usually be used in machines operating at high rotational speeds when the steady load on the bearing is low. A novel form of hydrodynamic bearing which incorporates recesses in the bearing surface has been proposed by the authors which improves the dynamic characteristics; however, earlier work has not fully assessed the steady load characteristics of such bearings vis-à-vis conventional bearings for example. The aim of this paper is to present the results of experimental work on several designs of the proposed novel bearings, to assess the bearing's performance and to compare it with that of conventional bearings. The results of the work show that the steady load-carrying capacity is adversely affected by the inclusion of recesses in the bearing surface, but that this is only a marginal effect provided that the number of recesses and their geometry are selected with care.

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Silchenko, P. N., G. A. Timofeev, M. V. Mesnyankin, and E. S. Novikov. "Load Capacity of Eccentric Roller Bearings." Proceedings of Higher Educational Institutions. Маchine Building, no. 07 (724) (July 2020): 13–21. http://dx.doi.org/10.18698/0536-1044-2020-7-13-21.

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Eccentric roller bearings are commonly used in engineering and serve as actuating links in mechanical drives of various machines. Load capacity is one of the main parameters of such bearings. This paper presents possible kinematic schemes of an eccentric roller bearing and the specifics of the actual radial load distribution when it is applied to the driving ring between the rolling bodies. It is established that the load capacity of the eccentric roller bearing depends on the actual stress occurring when the rolling body of the minimal radius and the inner ring raceway are in contact. Equations are obtained for calculating the permissible radial load that the rolling body of the minimal radius with a raceway can bear. The limiting load is determined that satisfies the conditions of contact strength of the bearing’s assembly units and ensures performance of the bearing in a mechanical drive of a machine. The results of determining the limiting load of the eccentric roller bearing and the results’ analysis are presented using a specific example. To ensure the performance of the bearing, the optimal ratio of the inner ring radius to the minimum rolling body radius is determined.

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Zhang, Xia, Xin Rong Wang, Xiao Hai Li, and Xuhong Chu. "Study on Influence Factors of Bearing Capacity of Water-Lubricated Thrust Bearing and its Improving Methods." Advanced Materials Research 479-481 (February 2012): 949–52. http://dx.doi.org/10.4028/www.scientific.net/amr.479-481.949.

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Water is a kind of low viscosity liquid and the bearing capacity of water lubrication bearings is very low. The influence factors of bearing capacity of water-lubricated thrust bearing and its improving methods are studied. First, bearing capacity characteristic of water-lubricated bearings is expounded. Secondly, the main factors of affecting bearing capacity are analyzed. At last, by combining the master pump motor running condition, the bearing capacity is improved by changing many factors including the material and hardness matching of friction pair, the roughness of grinding area, bearing structure, fan-shaped bushes number, pivot location, confined area of bearing, speed and the medium temperature, etc. The study provides a theory basis for improving bearing capacity of water-lubricated bearings.

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Kodnyanko, Vladimir, Stanislav Shatokhin, Andrey Kurzakov, Yuri Pikalov, Iakov Pikalov, Olga Grigorieva, Lilia Strok, and Maxim Brungardt. "Numerical Modeling on the Compliance and Load Capacity of a Two-Row Aerostatic Journal Bearing with Longitudinal Microgrooves in the Inter-Row Zone." Applied Sciences 11, no. 12 (June 20, 2021): 5714. http://dx.doi.org/10.3390/app11125714.

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Aerostatic bearings are attractive, with minimal friction losses, high durability, and environmental friendliness. However, such designs have a number of disadvantages, including low load-bearing capacity and high compliance due to high air compressibility and limited injection pressure. The article proposes a double-row aerostatic journal bearing with an external combined throttling system and longitudinal microgrooves in the inter-row zone. It is hypothesized that the use of microgrooves will reduce the circumferential flows of compressed air, as a result of which the compliance should decrease and the bearing capacity should increase. To test the hypothesis, we carried out the mathematical modeling, calculations, and theoretical study of stationary operation modes of the bearing for small shaft eccentricities in the vicinity of the central equilibrium position of the shaft and bearing capacity for arbitrary eccentricities. Formulas were obtained for the numerical evaluation of compliance for bearings with a smooth bushing surface and with longitudinal microgrooves. Iterative finite-difference methods for evaluating the fields of the squared pressure are proposed, on the basis of which the load capacity of the bearings is calculated. Experimental verification of the bearing’s theoretical characteristics was carried out, which showed satisfactory agreement between the compared data. The study of the compliance and load capacity of a microgroove bearing yielded impressive results. We show that the positive effect from the application of the improvement begins to manifest itself already at four microgrooves; the effect becomes significant at six microgrooves, and at twelve or more microgrooves, the circumferential flows in the bearing gap practically disappear; therefore, the bearing characteristics can be calculated on the basis of one-dimensional models of air lubrication longitudinal flow. Calculations have shown that for a length of L = 1, the maximum load capacity of a bearing with microgrooves is 1.5 times higher than that of a conventional bearing; for L ≥ 1.5, the bearing capacity increases twice or more. The result obtained allows us to recommend the proposed improvement for practical use in order to increase the load capacity of aerostatic journal bearings significantly.

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Martsinkovsky, V., V. Yurko, V. Tarelnik, and Yu Filonenko. "Designing Thrust Sliding Bearings of High Bearing Capacity." Procedia Engineering 39 (2012): 148–56. http://dx.doi.org/10.1016/j.proeng.2012.07.019.

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Maiti, Bikas. "Seismic Pressure and Seismic Bearing Capacity of Foundations." International Journal of Psychosocial Rehabilitation 24, no. 5 (May 30, 2020): 7297–303. http://dx.doi.org/10.37200/ijpr/v24i5/pr2020762.

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8

Li, Yunfeng, and Di Jiang. "Dynamic Carrying Capacity Analysis of Double-Row Four-Point Contact Ball Slewing Bearing." Mathematical Problems in Engineering 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/850908.

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Carrying capacity is the most important performance index for slewing bearings. Maximizing the carrying capacity of slewing bearing is one pursuing goal for the bearing designer; this is usually realized by optimizing the design parameters. A method of analyzing the carrying capacity of double-row four-point contact ball slewing bearing by using dynamic carrying capacity surfaces was proposed in this paper. Based on the dynamic load carrying capacity surface of the slewing bearing, the effect of changes of the bearing design parameters, such as axial clearance, raceway groove radius coefficient, and contact angle, on the dynamic carrying capacity of the slewing bearing was researched; the trend and the degree of the effect of the micro changes of the bearing design parameters on the dynamic load carrying capacity of the bearing were discussed, and the results provide the basis for optimizing the design parameter of this type of slewing bearing.

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Whyte, I. L. "Bearing capacity of soils." Construction and Building Materials 9, no. 1 (February 1995): 62. http://dx.doi.org/10.1016/0950-0618(95)90007-1.

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10

Zhou, Quan, Yu Hou, and Ru Gang Chen. "Application of Materials on Foil Thrust Bearings for Micro Turbines." Advanced Materials Research 201-203 (February 2011): 2759–62. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.2759.

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Foil bearing that has a soft surface is a kind of air bearing. The performances of foil bearings are greatly affected by the materials of bearing surface, which is called foil element. In order to estimate the performance of foil bearings, two kinds of foil thrust bearings that are made of different materials respectively were tested in a micro turbine system, which contains rotation part and static part. Load capacity and stability of these foil thrust bearings were investigated in experiments. The results show that bearing which contains rubber has higher load capacity and bearing which contains copper foil has higher stability. According to the work in this paper, applications with different requirements can adopt suitable foil thrust bearing.

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Peer, Wasiq Maqbool. "Soil Bearing Capacity and Techniques to Improve the Bearing Capacity of Soil." International Journal for Research in Applied Science and Engineering Technology 9, no. 9 (September 30, 2021): 499–505. http://dx.doi.org/10.22214/ijraset.2021.37996.

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Abstract: Soil at a construction site may not always be totally suitable for supporting structures in its natural state. In such a case, the soil needs to be improved to increase its bearing capacity and decrease the expected settlement. This paper gives an overview of techniques that are commonly used to improve the performance of saturated clayey soil in situ, its functions, methods of installation. Then, this study concluded that there is an urgent need to study the technique of removal and replacement for improving soil behaviour taking into consideration geotechnical requirements (i.e.bearing capacity and settlement) and cost to achieve the optimum thickness of replacement layers and the most suitable material corresponding to minimum total cost of foundation works. Keywords: Bearing capacity failure, Preloading, drains, stone column, Dynamic compaction, Grouting methods of soil improvement

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SĘP, Jarosław, Leszek TOMCZEWSKI, and Lidia GAŁDA. "STEADY-STATE ANALYSIS OF JOURNAL BEARINGS WITH HELICAL GROOVES." Tribologia 279, no. 3 (July 1, 2018): 123–30. http://dx.doi.org/10.5604/01.3001.0012.7020.

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The spiral groove on the sliding journal surface enables the contaminants and eventual wear debris removal from the contact zone and bearing clearance. In this way, the wear and seizure resistance of slide bearings operating in difficult conditions became greater. The presence of a groove on bearing’s surface affects the hydrodynamic performance of the bearing. The aim of the article is to study the load carrying capacity, oil flow rate, and maximum oil temperature and pressure of slide bearings with a spiral groove at different operational conditions. Simulations were realized with the adiabatic, three-dimensional model of the oil flow in the bearing clearance. The oil flow was determined with the Navier-Stokes, continuity, and energy equations. The finite volume method was applied for calculations in ANSYS Fluent software. As a result of the investigations, it has been stated that, with the sliding velocity increase, the load capacity also increased, but the load capacity of the grooved journal was smaller than that of plain bearings. The maximum oil temperature in the bearing clearance of grooved journal bearing was lower than that of smooth ones, and, with the sliding velocity increase, the maximum temperature also increased. The oil flow rate was greater for the grooved series than for the smooth seies at all examined velocities and clearances.

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13

Lu, Zhi-wei, Jun-an Zhang, and Bo Liu. "Research and Analysis of the Static Characteristics of Aerostatic Bearings with a Multihole Integrated Restrictor." Shock and Vibration 2020 (February 29, 2020): 1–11. http://dx.doi.org/10.1155/2020/7426928.

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In order to further study the performance of aerostatic bearing, an aerostatic bearing with a multihole integrated restrictor was proposed in this paper. Based on the physical model of aerostatic bearings, the governing equation was established, deduced discretely, and solved numerically by the finite-difference method and flow balance principle in Cartesian coordinates. The bearing capacity and stiffness of aerostatic bearings have been analyzed, and the relevant experimental research has been carried out in this paper. The results showed that the number of orifices in the integrated restrictor had a significant effect on the bearing capacity, and the maximum bearing capacity of a nine-hole integrated throttling bearing was approximately 1.9 times greater than that of a single-hole bearing. The bearing stiffness was greatly affected by the diameter of the orifices, and the optimum bearing stiffness was determined. The corresponding gas film clearance also changed accordingly.

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14

Martsynkovskyy, Vasyl, and Volodymyr Yurko. "Solutions for Increasing the Bearing Capacity of Thrust Bearings." Applied Mechanics and Materials 630 (September 2014): 208–19. http://dx.doi.org/10.4028/www.scientific.net/amm.630.208.

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Design faults, imperfect manufacturing processes, change of technological operating modes of the turbocompressors in gas, petroleum, chemical and petrochemical industry cause axial rotor shifts. Therefore, the task of manufacturing the high-efficient and reliable thrust bearings is important nowadays along with effective rotor balancing, methods of axial forces calculation considering possible operating modes, improvement of static electricity elimination system, protective and monitoring systems of the axial shift. Effective methods for increasing the bearing capacity of thrust bearings, applied by TRIZ Ltd, have been studied in the report. The accepted and realized on the operating equipment solutions have enabled to increase the bearing capacity of thrust bearings significantly and to reduce oil consumption ratio, keeping down location dimensions to the equipment.

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15

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 (April 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 Reynolds equation. According to the height and distribution density of microstructure, the bearing capacity parameters were obtained. The load-carrying capacity of micro structure journal bearing is significantly higher than that of plain bearing. In this paper, a practical model with cylindrical micro-textured surface is given for journal bearing applications with high capacity demand.

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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 capacity by increase in the bearing width and by application herringbone or spiral grooves on the sleeve and journal surfaces of HDD micro-bearings.

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Liu, Yongmeng, Zifei Cao, Yuan Zhang, Dawei Wang, Xiaoming Wang, and Chuanzhi Sun. "Design and Research of Symmetrical Multi-Throttle Thrust Hydrostatic Bearing Based on Comparative Analysis of Various Meshes." Symmetry 14, no. 2 (February 10, 2022): 351. http://dx.doi.org/10.3390/sym14020351.

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Due to the advantages of high rotation accuracy and long life, hydrostatic air bearings are widely used in precision rotation equipment, such as machine tools and turntables. It is imperative to reasonably design the structural size of the bearing, especially as the size of the bearing in the precision turntable determines the bearing capacity of the turntable. At present, commercial CFD software is used chiefly for simulation verification for the design of air bearings. The mesh divided in the simulation calculation has a significant impact on the efficiency of the calculation and determines the accuracy of the final simulation results. Therefore, this paper takes the symmetrical multi-throttle thrust bearing in the precision turntable as the research object and compares and studies the advantages and disadvantages of sliced structured meshes, continuous structured meshes, and unstructured meshes. On this basis, simulation analysis of bearing capacity for different radial equalizing groove lengths, widths, and depths and explores the influence of the structure size of the thrust bearing on its bearing capacity. The study shows that the length and depth of the throttle groove significantly influence the bearing capacity, while the width has little influence on the bearing capacity. Therefore, under the specific cavity volume to ensure the dynamic characteristics of the bearing, the width of the throttling groove should be reduced first, and the length and depth of the throttling groove should be increased to improve the bearing capacity.

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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 (February 9, 2015): 30–37. http://dx.doi.org/10.1108/ilt-03-2013-0028.

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

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Schaumarov, Nigmat, and Rakhmatullo Pirmatov. "BEARING CAPACITY OF PRECOMPRESSED LOAD-BEARING ELEMENTS MADE OF HEAVY CONCRETE UNDER SINGLE DYNAMIC LOADS." European International Journal of Multidisciplinary Research and Management Studies 02, no. 07 (July 1, 2022): 1–8. http://dx.doi.org/10.55640/eijmrms-02-07-01.

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Chen, Dongju, You Zhao, Chunqing Zha, Ri Pan, and Jinwei Fan. "Performance evaluation of different types of micro-textured hydrostatic spindles under the main influencing factors." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 235, no. 10 (January 27, 2021): 2169–83. http://dx.doi.org/10.1177/1350650121991315.

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To improve the performance of a hydrostatic bearing, a method of constructing micro-textures on the inner surface of a bearing is proposed to increase the bearing capacity and reduce the friction coefficient. In this paper, the composite texture is innovatively proposed, and the theoretical models of hydrostatic radial bearings under four situations including non-texture, square, spherical, and composite textures are established. The effect of texture shapes and texture parameters on bearing performance is numerically studied and the influence level of various factors on bearing performance is evaluated innovatively using the cross-correlation analysis. The results show that the presence of a micro-texture can improve the bearing capacity and reduce the friction coefficient of the bearing compared with smooth surface bearings; the composite micro-texture increases the bearing capacity by about 9.5%, the stiffness increases by about 8.2%, and the friction coefficient is reduced by about 10.5%; there is an optimal micro-texture unit area ratio (between 30% and 40%) making the bearing capacity largest and the friction coefficient smallest; finally, the influence level of various factors on the bearing performance is evaluated. The relative depth of the texture has the greatest influence on it, followed by the number of textures, and finally the unit area ratio. The above results will provide a theoretical basis for the design of hydrostatic bearings with micro-textures.

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21

Bornstein, K. R. "Dynamic Load Capabilities of Active Electromagnetic Bearings." Journal of Tribology 113, no. 3 (July 1, 1991): 598–603. http://dx.doi.org/10.1115/1.2920665.

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Magnetic bearings are finding increasing use in a wide range of applications. It is well known that the static capacity of a bearing can be determined by its saturation point. The static capacity has often been the prime criterion for the selection of magnetic bearing size. The dynamic capacity of a bearing is a much more complicated function. This paper will develop equations to express the dynamic load capacity of a magnetic bearing in terms of its amplifier size, the frequency of excitation, the magnetic airgap, the method of force actuation, and certain nondimensional terms.

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Fan, Hong Chao, Jing Lin Tong, Xin Hua Yi, Jin Bao He, and Jian Xi Yang. "Load Bearing Capacity of Oil Film Bearing Research." Applied Mechanics and Materials 42 (November 2010): 255–58. http://dx.doi.org/10.4028/www.scientific.net/amm.42.255.

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The oil film have many excellences such as bigger load bearing capacity, longer life, wider velocity range, lower friction etc. The traditional design method is experience test. Even the design parameters could meet the application requirements, but they can not exert the best performance of the oil film bearing. The relationship between load bearing capacity and materials, lubricants, design parameters and structural characteristics of oil film bearing was analysed. To improve the load capacity and run at the optimal state, the objective function was built to optimize the main parameters. Optimization results showed that the load bearing capacity has been greatly improved.

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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 (November 28, 2022): 336. http://dx.doi.org/10.3390/lubricants10120336.

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

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He, Peiyu, Qinrong Qian, Yun Wang, Hong Liu, Erkuo Guo, and Hua Wang. "Influence of finite element mesh size on the carrying capacity analysis of single-row ball slewing bearing." Advances in Mechanical Engineering 13, no. 4 (April 2021): 168781402110090. http://dx.doi.org/10.1177/16878140211009030.

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Slewing bearings are widely used in industry to provide rotary support and carry heavy load. The load-carrying capacity is one of the most important features of a slewing bearing, and needs to be calculated cautiously. This paper investigates the effect of mesh size on the finite element (FE) analysis of the carrying capacity of slewing bearings. A local finite element contact model of the slewing bearing is firstly established, and verified using Hertz contact theory. The optimal mesh size of finite element model under specified loads is determined by analyzing the maximum contact stress and the contact area. The overall FE model of the slewing bearing is established and strain tests were performed to verify the FE results. The effect of mesh size on the carrying capacity of the slewing bearing is investigated by analyzing the maximum contact load, deformation, and load distribution. This study of finite element mesh size verification provides an important guidance for the accuracy and efficiency of carrying capacity of slewing bearings.

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Rolink, Amadeus, Georg Jacobs, Matthias Müller, Timm Jakobs, and Dennis Bosse. "Investigation of manufacturing-related deviations of the bearing clearance on the performance of a conical plain bearing for the application as main bearing in a wind turbine." Journal of Physics: Conference Series 2257, no. 1 (April 1, 2022): 012006. http://dx.doi.org/10.1088/1742-6596/2257/1/012006.

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Abstract The use of a segmented conical plain bearing for the application as main bearing in a wind turbine offers multiple advantages. The main bearing can be designed very compact. In addition, in case of a main bearing damage, individual bearing segments can be exchanged on the tower without the use of an external crane, in contrast to the repair procedure of rolling bearings. It is well known from conventional applications of plain bearings that the bearing clearance has a major influence on the load carrying capacity. Therefor the realization of narrow tolerances in the manufacturing of the bearing components is necessary. In this paper, the influence of the manufacturing tolerances on the performance of conical plain bearings is investigated. The influence of the tolerances on the load carrying capacity can be determined by conducting elastohydrodynamic (EHD) simulations. Finally, an evaluation of the robustness of the conical bearing concept against manufacturing-related deviations is carried out.

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Wang, Jian Ping, Jian Hui Zhou, and Yu Liu. "Influence of Groove Structure on the Performances of Water Lubricated Marine Stern Bearings." Advanced Materials Research 760-762 (September 2013): 923–27. http://dx.doi.org/10.4028/www.scientific.net/amr.760-762.923.

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Groove structure has a great effect on the operational performance of the water lubricated marine stern bearings. This paper discusses that the effects of the number and the layout of the grooves on the carrying capacity and friction coefficient of the bearing based the application of numerical analysis with Software of MATLAB. The research results show that the wider the grooves are, the lower both carrying capacity and friction coefficient of the bearing are; the location of the grooves in the bearing is important factor to influence the performance of the bearing. When one groove is located just below the stern bearing, both friction coefficient and carrying capacity of the bearing will be decreased.

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Mosher, P., and D. W. Childs. "Theory Versus Experiment for the Effects of Pressure Ratio on the Performance of an Orifice-Compensated Hybrid Bearing." Journal of Vibration and Acoustics 120, no. 4 (October 1, 1998): 930–36. http://dx.doi.org/10.1115/1.2893922.

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This research investigates the effect of varying the concentric recess pressure ratio of hybrid (combination hydrostatic and hydrodynamic) bearings to be used in high-speed, high-pressure applications. Bearing flowrate, load capacity, torque, rotordynamic coefficients, and whirl frequency ratio are examined to determine the concentric, recess-pressure ratio which yields optimum bearing load capacity and dynamic stiffness. An analytical model, using two-dimensional bulk-flow Navier-Stokes equations and anchored by experimental test results, is used to examine bearing performance over a wide range of concentric recess pressure ratios. Typically, a concentric recess pressure ratio of 0.50 is used to obtain maximum bearing load capacity. This analysis reveals that theoretical optimum bearing performance occurs for a pressure ratio near 0.40, while experimental results indicate the optimum value to he somewhat higher than 0.45. This research demonstrates the ability to analytically investigate hybrid bearings and shows the need for more hybrid-bearing experimental data.

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Dong, Xiao Fei, Bin Lin, and Guan Wei Zhang. "Effects of Lubricant Viscosity-Temperature Relationship on the Capacity of Sliding Bearing." Applied Mechanics and Materials 365-366 (August 2013): 1185–89. http://dx.doi.org/10.4028/www.scientific.net/amm.365-366.1185.

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Depending on the experimental data of Water-based lubricant viscosity-temperature relationship, this paper adopts Fluent software to analyze how lubricant viscosity-temperature relationship affects load-carrying properties of hybrid sliding bearings. The results show that lubricants will rise obviously when hybrid sliding bearings are in high speed, which will greatly affect bearing capacity and stiffness of bearings. The maximum stiffness of hybrid sliding bearings appears when the eccentricity is from 0.4 to 0.5. This conclusion is dramatically different from bearing capacity number ignored lubricant viscosity-temperature relationship.

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Lu, Li Ming. "The Stress Analysis about Rolling-Sliding Blend Bearing under Heavy Load." Advanced Materials Research 308-310 (August 2011): 1792–95. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.1792.

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In the paper a new kind of rolling-sliding blend bearing has been studied. In order to comparing the new bearings and rolling bearings in the carrying capacity and service life, the stresses on the inner ring, the outer ring and the roller of rolling bearing and rolling-sliding blend bearing are analyzed by establishing the finite element model and solving it with finite element analysis software. The results show that the width of the stress concentration area on the outer ring and the roller and the inner ring of rolling-sliding blend bearing is 25 per cent narrower than that of rolling bearing and the depth of the largest stress on the outer ring and the roller and the inner ring of rolling-sliding blend bearing is 25 per cent shallower than that of rolling bearing and the largest stress on the middle and the end of the outer ring and the roller and the inner ring of rolling-sliding blend bearing is much smaller than that of rolling bearing. In the same case rolling-sliding blend bearings have greater carrying capacity and longer service life than rolling bearings.

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Wang, You Qiang, and Chao Li. "Numerical Analysis of Hydrodynamic Lubrication on Water-Lubricated Rubber Bearings." Advanced Materials Research 299-300 (July 2011): 12–16. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.12.

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Water lubricated rubber bearings are one of the most appropriate bearings for underwater use. The most popular design used widely today is the straight fluted rubber bearing. The special configuration leads to partial hydrodynamic lubrication and low load capacity. A new bearing bush structure which is favorable for constructing continuous hydrodynamic lubrication was designed and produced for experiment in the paper. The eccentricity ratio of the new structure rubber bearing was measured under different loads in experiment. Used the measured eccentricity ratios, the load capacity was calculated by numerical simulation and compared with the given test values. The calculated values were in good agreement with the given test results. The results show that complete hydrodynamic lubrication can be formed in the new designed rubber bearing. The experimental results also indicate that there is an appropriate bearing clearance which the load capacity is up to the maximum.

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31

Budhu, M., and A. Al-Karni. "Seismic bearing capacity of soils." Géotechnique 43, no. 1 (March 1993): 181–87. http://dx.doi.org/10.1680/geot.1993.43.1.181.

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32

Perau, Eugen W. "Bearing Capacity of Shallow Foundations." Soils and Foundations 37, no. 4 (December 1997): 77–83. http://dx.doi.org/10.3208/sandf.37.4_77.

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Mrunal, Patki, J. N. Mandal, and D. M. Dewaikar. "Computation of bearing capacity factorNγ." International Journal of Geotechnical Engineering 8, no. 4 (January 16, 2014): 372–82. http://dx.doi.org/10.1179/1939787913y.0000000021.

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Oloo, S. Y., D. G. Fredlund, and J. K.-M. Gan. "Bearing capacity of unpaved roads." Canadian Geotechnical Journal 34, no. 3 (June 1, 1997): 398–407. http://dx.doi.org/10.1139/t96-084.

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35

Borozenets, L. M., and E. A. Ushakova. "The simplex piles bearing capacity." IOP Conference Series: Materials Science and Engineering 698 (December 18, 2019): 022057. http://dx.doi.org/10.1088/1757-899x/698/2/022057.

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36

Timco, Garry. "Bearing capacity of ice covers." Cold Regions Science and Technology 58, no. 3 (September 2009): 97–98. http://dx.doi.org/10.1016/j.coldregions.2009.04.006.

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37

Saran, S., and Hasan Rangwala. "Seismic bearing capacity of footings." International Journal of Geotechnical Engineering 5, no. 4 (October 2011): 447–55. http://dx.doi.org/10.3328/ijge.2011.05.04.447-455.

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Rassam, Daud W., and David J. Williams. "Bearing Capacity of Desiccated Tailings." Journal of Geotechnical and Geoenvironmental Engineering 125, no. 7 (July 1999): 600–609. http://dx.doi.org/10.1061/(asce)1090-0241(1999)125:7(600).

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39

Erickson, Hans L., and Andrew Drescher. "Bearing Capacity of Circular Footings." Journal of Geotechnical and Geoenvironmental Engineering 128, no. 1 (January 2002): 38–43. http://dx.doi.org/10.1061/(asce)1090-0241(2002)128:1(38).

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40

Lu, Shi Jie, Hua Dong Chen, Wei Chen, Tong Xiang, and Xie Feng Hong. "Model Tests of Foundation Bearing Capacity of Sandy Soil and Pile Foundation Bearing Capacity." Applied Mechanics and Materials 580-583 (July 2014): 113–17. http://dx.doi.org/10.4028/www.scientific.net/amm.580-583.113.

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Using self―made model device, researchers studied the characteristics of foundation settlement of sandy soil and pile foundation load―bearing in sandy soil. Through weight loading, researchers analyzed the phenomenon of foundation settlement. Then, researchers embedded friction piles in sand, so as to analyzed pile foundation bearing capacity. The methods and results of the research can provide guidance for teaching of Soil mechanics and foundation engineering.

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41

Pender, M. J. "Bearing strength surfaces implied in conventional bearing capacity calculations." Géotechnique 67, no. 4 (April 2017): 313–24. http://dx.doi.org/10.1680/jgeot.16.p.024.

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Pender, Michael John, and Christos Vrettos. "Bearing strength surfaces implied in conventional bearing capacity calculations." Géotechnique 69, no. 10 (October 2019): 932–35. http://dx.doi.org/10.1680/jgeot.18.d.005.

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43

Manser, Belkacem, Sofiane Khelladi, Michael Deligant, Haroun Ragueb, Idir Belaidi, and Farid Bakir. "Behaviour of hydrodynamic journal bearing under the combined influence of textured surface and Non-Newtonian Rabinowitsch fluid model." E3S Web of Conferences 321 (2021): 03006. http://dx.doi.org/10.1051/e3sconf/202132103006.

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In the present study, the static characteristics of hydrodynamic circular journal bearings of finite length are highlighted, using the combined influences of textured surface and non-Newtonian lubricants behavior, obeying to the Rabinowitsch fluid model. The associated nonlinear Rabinowitsch-Reynolds equation has been discretized using finite differences scheme and solved by the mean of Elrod’s algorithm taking into account the presence of cylindrical textures on full/optimum bearing surface. Following to the absence of textures on the bearing surface or the non-Newtonian fluid behavior, the obtained results are in good agreement with the reference ones. The hydrodynamic lubrication static performances are computed for various parameters such as textures location; eccentricity ratio and the rheological coeffcient. The results suggest that texturing the bearing’s convergent zone enhances significantly the load carrying capacity and reduces the friction coeffcient, whereas texturing the full bearing surface may leads to bad performances. It is also noticed that the pseudoplastic lubricant coeffcient decreases the bearing performances (load capacity and pressure) compared to Newtonian fluid cases. Considering the optimal arrangement of textures on the contact surface, a significant improvement in terms of load capacity and friction can be achieved, especially at low pseudoplasticity effect.

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Qiang, Mingchen, Mingzhe Liu, Qi Zhao, Yu Hou, Shaohang Yan, and Tianwei Lai. "Feasibility Analysis of Adopting the Hydrogen Hydrostatic Thrust Bearing." Applied Sciences 13, no. 16 (August 18, 2023): 9372. http://dx.doi.org/10.3390/app13169372.

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The hydrogen hydrostatic thrust bearing (HHTB) is a key component of hydrogen liquefaction that impacts turbo-expander characteristics. To analyze the feasibility of using the HHTB in this application, characteristics of HHTBs were calculated using a CFD model. To upgrade the performance of the HHTB, the impacts of bearing structure and operating parameters on static performance were investigated. Dynamic characteristics of the HHTB were studied using the dynamic grid method. It was found that the load capacity of the HHTB is less than that of helium-lubricated bearings but higher than that of air- and methane-lubricated bearings. The turbulent kinetic energy of hydrogen is higher than that of other gases. Load capacity can be enhanced through boosting supplied pressure, expanding the diameter of supply orifices, reducing gas film clearance, increasing the orifices quantity and setting a circumferential groove. A reduction in disturbance amplitude slightly increased the bearing’s dynamic stiffness. The dynamic stability of the HHTB was improved by a small film clearance in response to disturbance.

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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 (August 31, 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 bearings currently operate close to maximum capacity and that there is a significant deflection of the bearing journals under the applied joint load of the drum’s own weight and the process load of grinders and slurry. The current extent of tilting can cause oil film breakage at the bearing’s edge. The result of calculations amended by bearings’ examination and measurements allowed the formulations of conclusions regarding the current state of the bearings and evaluated load conditions. Guidelines were established for later developments in the capacity and reliability of the bearings.

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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, such as load capacity and attitude angle that vary with different eccentricity ratios, are also discussed. The results show that the load capacity of the bearing decreases with increasing temperature. The pressure difference also increases as the eccentricity ratio increases. The high-pressure region is concentrated at the tip of the groove for the HGJB. In addition, the combined HGJB and grooved thrust bearing can be used to stabilize the journal because of the low attitude angle. These findings may help and facilitate the design of hydrodynamic bearings suitable for working in warm and hot environments in the future.

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Wang, You-Qiang, Xiu-Jiang Shi, and Li-Jing Zhang. "Experimental and numerical study on water-lubricated rubber bearings." Industrial Lubrication and Tribology 66, no. 2 (March 4, 2014): 282–88. http://dx.doi.org/10.1108/ilt-11-2011-0098.

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Purpose – Water-lubricated rubber bearing is one of the most appropriate bearings for underwater use. The most popular design used widely today is the straight fluted rubber bearing. The special configuration leads to partial hydrodynamic lubrication and low load capacity. A new bearing bush structure with two cavities which is favorable for constructing continuous hydrodynamic lubrication was designed and studied. The paper aims to discuss these issues. Design/methodology/approach – A new bearing bush structure with two cavities which is favorable for constructing continuous hydrodynamic lubrication was designed. The apparatus for studying the tribological behaviors of the two types of water-lubricated rubber bearings has been devised and established in the paper. The experimental studies on the tribological properties of the rubber bearings have been conducted under different loads and velocities. The eccentricity ratio of the new structure rubber bearing with two cavities was measured in experiment and the load capacity was calculated by numerical simulation. Findings – The experimental results show that the friction coefficient decreases with increasing velocity; the friction coefficient increases sharply with the rising temperature, the friction coefficient increases at first and then decreases with increasing load for fluted rubber bearings. The numerical results were in good agreement with the experimental results. The numerical results show that complete hydrodynamic lubrication can be formed in the new designed rubber bearing with two cavities. The experimental and numerical results all indicate that there is an appropriate bearing clearance which the friction coefficient is minimum and the load capacity is maximum. Originality/value – A new bearing bush structure with two cavities which is beneficial to constructing continuous hydrodynamic lubrication film was designed. A new apparatus for studying the tribological behaviors of the two types of water-lubricated rubber bearings has been devised and established. Experimental and numerical study on the new structure rubber bearing were conducted in the paper.

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HE, Peiyu, Yi DING, Yun WANG, Fuzhu LI, Weili LIU, and Hua WANG. "analysis method of carrying capacity accuracy of three-row roller slewing bearing." Mechanics 28, no. 4 (August 30, 2022): 266–72. http://dx.doi.org/10.5755/j02.mech.29914.

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Three-row roller slewing bearings are one of the critical core components of large rotating equipment. Heavy-duty conditions have extremely high requirements for the carrying capacity. The new load capacity analysis method proposed in this paper can effectively improve the accuracy and efficiency of the carrying capacity analysis of three-row roller slewing bearings. The three-row roller slewing bearing solid rollers are replaced in the model by the upper and lower halves of the rollers and two springs. The local contact model of the three-row roller slewing bearing was established and verified by the Hertz contact theory. The overall finite element model of the three-row roller slewing bearing was verified by strain tests. The new method can calculate the stress and strain distribution, load distribution, and deformation of the entire circle of the three-row roller slewing bearing and reduce the mesh number of the finite element of the overall model. Roller chamfer can also be considered closer to the actual working conditions and improves calculation efficiency and accuracy.

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Zhang, Jie, Ying Hua Liao, and Bo Huang. "Prediction on the Wear Life of Bearings for Planetary Gears." Applied Mechanics and Materials 397-400 (September 2013): 470–74. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.470.

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In this paper, firstly, a dynamic model of planetary gears involving the bearing wear and a model to calculation of the bearing wear capacity will be established. And then the basic flow for prediction on the wear life of bearings for planetary gears will be given by the proposed two models. Finally, the influences of the bearing wear on the bearing wear life will be studied and the methods to improve the bearing wear life will also be discussed. The simulation and analysis results show that with the increase of the limit wear capacity, the bearing wear will experience three periods, such as rapid increasing, steady increasing and constant, and there are also a significant impact of the bearing clearance and stiffness on the bearing wear life.

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Pitarresi, J. M., and K. A. Haller. "An Air Layer Modeling Approach for Air and Air/Vacuum Bearings." Journal of Manufacturing Science and Engineering 119, no. 3 (August 1, 1997): 388–92. http://dx.doi.org/10.1115/1.2831118.

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Air layer supported bearing pads, or “air bearings” as they are commonly called, are popular because of their high load capacity and low in-plane coefficient of friction, making them well suited for supporting moving, high accuracy manufacturing stages. Air/vacuum bearings enhance these capabilities by giving the bearing pad load resistance capacity in both the upward and downward directions. Consequently, it is desirable to know how to model the air layer between the bearing pad and the bearing surface. In this paper, a simple finite element modeling approach is presented for investigating the vibrational characteristics of an air layer supported bearing. It was found that by modeling the air layer as a bed of uniform springs who’s stiffness is determined by load-displacement tests of the bearing, a reasonable representation of the response can be obtained. For a bearing supported by air without vacuum, the dynamic response was very similar to that of a freely supported bearing. The addition of vacuum to an air bearing was found to significantly lower its fundamental frequency which could lead to unwanted resonance problems.

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Journal articles on the topic 'Bearing capacity'

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