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Journal articles on the topic 'Bearing load'

Author: Grafiati

Published: 4 June 2021

Last updated: 28 January 2023

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1

Keller, Jonathan, Yi Guo, Zhiwei Zhang, and Doug Lucas. "Comparison of planetary bearing load-sharing characteristics in wind turbine gearboxes." Wind Energy Science 3, no. 2 (2018): 947–60. http://dx.doi.org/10.5194/wes-3-947-2018.

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Abstract. In this paper, the planetary load-sharing behavior and fatigue life of different wind turbine gearboxes when subjected to rotor moments are examined. Two planetary bearing designs are compared – one design using cylindrical roller bearings with clearance and the other design using preloaded tapered roller bearings to support both the carrier and planet gears. Each design was developed and integrated into a 750 kW dynamometer tests, the loads on each planet bearing row were measured and compared to finite-element models. Bearing loads were not equally shared between the set of cylindr

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2

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 (2022): 1–8. http://dx.doi.org/10.55640/eijmrms-02-07-01.

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3

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

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

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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 (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

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Lin, Xi Chen, Rui Ping Zhou, and Neng Qi Xiao. "Influence Characteristics of Fluid Film Bearing’s Displacement-Load on Rotating Vibration of Rotor System." Applied Mechanics and Materials 727-728 (January 2015): 567–71. http://dx.doi.org/10.4028/www.scientific.net/amm.727-728.567.

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In high load-carrying bearing-rotor system, bearings’ places usually change for load distribution or in continual work. It influences the system’s stability, and brings out different vibration response in rotor system. This article puts forward mathematical model of bearing’s stiffness under load which is calculated from bearing displacement. Then through numerical integration it studies system’s rotating vibration with different bearing settings. The results of the analysis show that bearing displacement has a great effect on dynamic characteristics of the bearing-rotor system.

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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. Equatio

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

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

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8

Krause, A., J. Gnauert, G. Jacobs, D. Bosse, and L. Schmitz. "Experimental Analysis of Planet Carrier Bearing Loads under Torque and Bending Moment in a Four-Point-Suspension Drive Train." Journal of Physics: Conference Series 2265, no. 3 (2022): 032007. http://dx.doi.org/10.1088/1742-6596/2265/3/032007.

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Abstract Bearing failures in wind turbine gearboxes still occur which results in downtimes and hence leads to an increase in the levelized cost of energy. One of these affected bearings are the planet carrier bearings as they are still subject to unexpected fatigue related failure modes, like pitting and spalling, which are mainly influenced by the load distribution in the bearing. Hence it is necessary to determine the influence of torque and bending moment loads onto the planet carrier bearings. In this work the generator sided planet carrier bearing load distribution is investigated. Theref

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9

Hart, Edward, Adam Stock, George Elderfield, et al. "Impacts of wind field characteristics and non-steady deterministic wind events on time-varying main-bearing loads." Wind Energy Science 7, no. 3 (2022): 1209–26. http://dx.doi.org/10.5194/wes-7-1209-2022.

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Abstract. This work considers the characteristics and drivers of the loads experienced by wind turbine main bearings. Simplified load response models of two different hub and main-bearing configurations are presented, representative of both inverting direct-drive and four-point-mounted geared drivetrains. The influences of deterministic wind field characteristics, such as wind speed, shear, yaw offset, and veer, on the bearing load patterns are then investigated for similarity scaled 5, 7.5, and 10 MW reference wind turbine models. Main-bearing load response in cases of deterministic gusts and

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10

Stango, R. J., and R. H. Jungmann. "A Variational Method for Evaluating Thrust Bearing Element Load Distribution." Journal of Engineering for Industry 111, no. 1 (1989): 79–86. http://dx.doi.org/10.1115/1.3188735.

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A variational method is outlined for computing thrust bearing element loads on the basis of minimizing the potential energy of the system. The problem is formulated in terms of a polynomial displacement assumption for bearing elements. To illustrate the computational procedure, numerical studies are presented for a thrust bearing subjected to a range of load eccentricities. The variational approach is demonstrated to result in an accurate and efficient solution for bearing element load distributions. Excellent agreement is achieved when comparison is made to conventional methods of classical b

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11

Nässelqvist, Mattias, Rolf Gustavsson, and Jan-Olov Aidanpää. "Experimental and Numerical Simulation of Unbalance Response in Vertical Test Rig with Tilting-Pad Bearings." International Journal of Rotating Machinery 2014 (2014): 1–10. http://dx.doi.org/10.1155/2014/309767.

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In vertically oriented machines with journal bearing, there are no predefined static radial loads, such as dead weight for horizontal rotor. Most of the commercial software is designed to calculate rotordynamic and bearing properties based on machines with a horizontally oriented rotor; that is, the bearing properties are calculated at a static eccentricity. For tilting-pad bearings, there are no existing analytical expressions for bearing parameters and the bearing parameters are dependent on eccentricity and load angle. The objective of this paper is to present a simplified method to perform

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12

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 (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

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13

Yang, Jiapeng, and Qi An. "Calculating method of the fatigue life for the main supporting bearing of mixing drum in concrete mixing truck when considering drum’s vibration." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 233, no. 2 (2018): 223–35. http://dx.doi.org/10.1177/1464419318770893.

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It has been observed that there are many studies focusing on the vibration properties of bearings caused by manufacturing errors, assembly related errors, out-of-balance rotor rotation, cage instability, etc. But there are fewer research studies on the effect of rotor’s vibration on double-row rolling element bearings’ mechanical properties. In this paper, a calculating method has been established for bearing’s roller load and fatigue life when considering rotor’s vibration. And this model is applied to study the main supporting bearing of the mixing drum of a certain type of concrete mixing t

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14

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 calculat

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15

Du Toit, Andrea. "Bearing the load." Nature Reviews Microbiology 16, no. 9 (2018): 521. http://dx.doi.org/10.1038/s41579-018-0067-3.

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16

Hollaway, L. "Load bearing composites." Construction and Building Materials 1, no. 3 (1987): 165–70. http://dx.doi.org/10.1016/0950-0618(87)90017-1.

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17

Zhang, Xiuli, Zhongwei Yin, Qin Dong, and Jun Cao. "Experimental comparison of the seizure loads of gray iron journal bearing and aluminum alloy journal bearing under aligned and misaligned conditions." Mechanics & Industry 21, no. 4 (2020): 408. http://dx.doi.org/10.1051/meca/2020038.

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Materials, surface roughness of bearing and shaft, and journal misalignment affect the seizure load of journal bearing. To improve the load carrying capacity of bearing and obtain better friction pair, this paper studies experimentally the seizure loads of a gray iron journal bearing and two kinds of aluminum alloy journal bearings under both aligned and misaligned conditions. Three shafts are used to study the effects of journal surface roughness and DLC coating. The journal center locus is recorded. Results show that the combination of DLC coating and the aluminum alloy with lower hardness h

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18

Kodnyanko, Vladimir, Stanislav Shatokhin, Andrey Kurzakov, et al. "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 (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 decre

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19

BASTIAN, Bartosz, Rafał GAWARKIEWICZ, and Michał WASILCZUK. "THE INFLUENCE OF HOUSING ARRANGEMENT AND INTERFERENCE ON PRELOAD AND THEORETICAL LIFETIME OF A SYSTEM OF TAPER ROLLER BEARINGS OF A HIGH SPEED SHAFT OF A WIND TURBINE GEARBOX." Tribologia, no. 4 (August 31, 2017): 21–26. http://dx.doi.org/10.5604/01.3001.0010.5984.

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A system of two taper roller bearings can carry loads with a high ratio of axial load to radial load. Such a system was proposed for a wind turbine gearbox following the poor durability of original bearing design with the aim of increasing durability. Because of size limits, a proposed system is composed of two different taper roller bearings. Standard manufacturers’ catalogues do not provide information on recommended preload or clearance conditions or the durability as a function of pre-load. That was the reason why durability was calculated on the basis of software provided by one of the ma

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20

Tipton, Leighton P. J. "Bearing Load Measurements on a 3-Shaft Gas Turbine." Applied Mechanics and Materials 1-2 (September 2004): 225–32. http://dx.doi.org/10.4028/www.scientific.net/amm.1-2.225.

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Axial location bearings are used to carry the load imbalance between the forward thrust of an aero-engine’s compressor and the rearwards drag of the turbine that drives the compressor’s rotation. The large gas turbines manufactured by Rolls-Royce have three independently rotating compressor/turbine stages, namely the low pressure (LP), the intermediate pressure (IP) and high pressure (HP) systems. The load imbalance, or bearing load, associated with each of these systems must be assessed during an engines development phase in order to confirm the reliability of the bearings throughout the oper

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21

Tomović, Radoslav. "A New Approach for the Load Calculation of the Most-Loaded Rolling Element of the Rolling Bearing with Internal Radial Clearance—A Case Study." Lubricants 10, no. 11 (2022): 306. http://dx.doi.org/10.3390/lubricants10110306.

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One of the most important factors influencing the study of the tribological behaviour of a rolling bearing is the calculation of the loads transmitted by individual rolling elements of the bearing. However, the calculation of the internal load distribution of rolling bearings is quite complicated. It is a nonlinear, statically indeterminate problem, which can only be solved numerically, through a number of iterations. This is often a problem in analysis because it complicates the mathematical model. This paper is presenting a case study with the goal to show the benefits of the application of

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22

Cheng, Wangquan (Winston), Shan Shih, John Grace, and Wenke Tu. "Axial Load Effect on Contact Fatigue Life of Cylindrical Roller Bearings." Journal of Tribology 126, no. 2 (2004): 242–47. http://dx.doi.org/10.1115/1.1614823.

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Besides primarily carrying radial load, cylindrical roller bearings with flanges or lips on both inner and outer raceways need also carry axial load in some applications. Because of the axial load, the equivalent dynamic load of the bearing will be increased and the bearing contact fatigue life will be decreased accordingly. The axial load effect on the roller bearing fatigue life had been studied by researchers in the past. Because of different assumptions used in their models, quite different predictions were made in their analysis. This work combines the methods used in the Fernlund-Synek a

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23

Guo, Zhiqiang, Shenlong Li, Wei Wu, and Liuyang Zhang. "Quasi-Static Load Sharing Characteristics of a Planetary Gear Set with Planet Journal Bearings." Applied Sciences 10, no. 3 (2020): 1113. http://dx.doi.org/10.3390/app10031113.

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The quasi-static load sharing characteristics of a planetary gear set with planet journal bearings are numerically investigated. The application of journal bearings instead of rolling bearings in planetary gear sets is an alternative to increase the rotation speed. Therefore, an effective analysis method is needed to estimate the dynamic performance of a planetary gear set with planet journal bearings. Here, an available load sharing factor computation method is developed considering the effect of the variable journal bearing stiffness. Results of an experiment are used to validate the effecti

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Menck, Oliver, Matthias Stammler, and Florian Schleich. "Fatigue lifetime calculation of wind turbine blade bearings considering blade-dependent load distribution." Wind Energy Science 5, no. 4 (2020): 1743–54. http://dx.doi.org/10.5194/wes-5-1743-2020.

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Abstract. Rotating bearings are some of the most commonly employed machine elements. As such, they are well-understood and thoroughly researched pieces of technology. Fatigue lifetime calculation is internationally standardized through ISO 281, which is based on the assumption that loads act on a bearing under constant rotation. Blade bearings of wind turbines do not conform to this assumption since their movement typically consists of small, repetitive oscillations. Moreover, their load distribution differs considerably over the bearing circumference, a load case for which ISO 281 refers to I

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Hagemann, Thomas, Huanhuan Ding, Esther Radtke, and Hubert Schwarze. "Operating Behavior of Sliding Planet Gear Bearings for Wind Turbine Gearbox Applications—Part I: Basic Relations." Lubricants 9, no. 10 (2021): 97. http://dx.doi.org/10.3390/lubricants9100097.

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The application of sliding planet gear bearings in wind turbine gearboxes has become more common in recent years. Assuming practically applied helix angles, the gear mesh of the planet stage causes high force and moment loads for these bearings involving high local loads at the bearing edges. Specific operating behavior and suitable design measures to cope with these challenging conditions are studied in detail based on a thermo-hydrodynamic (THD) bearing model. Radial clearance and axial crowning are identified as important design parameters to reduce maximum pressures occurring at the bearin

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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 (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 lubr

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27

Leontopoulos, Chris, Charalampos Mouzakis, and Michail Petrolekas. "Smart Bearing Sensor." Journal of Ship Production and Design 36, no. 01 (2020): 67–77. http://dx.doi.org/10.5957/jspd.2020.36.1.67.

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The recent increase in vessel shaftline bearing incidents indicates that a static shaft alignment design may not be suitable for all operational shaftline loading conditions. Hull deflections caused by vessel loading or propeller loads initiated by interaction with the wakefield have become important considerations in modern vessel design. Jack-up tests, typically used as a bearing load verification method, can only be accomplished under static shaft conditions and cannot verify the shaft dynamic behavior under running operational conditions. A newly developed sensor using strain gauge technol

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Zheng, Jingyang, Jinchen Ji, Shan Yin, and Van-Canh Tong. "Fatigue life analysis of double-row tapered roller bearing in a modern wind turbine under oscillating external load and speed." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, no. 15 (2020): 3116–30. http://dx.doi.org/10.1177/0954406220911966.

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Fatigue life analysis of roller bearing is usually performed for bearings under constant rotating speed and invariant loading conditions. For the bearings used in offshore floating direct-drive wind turbines, they often experience oscillating motions with varying loading patterns, for which the standard fatigue life analysis is not valid due to the presence of fluctuating loads. This paper presents the fatigue life analysis of a double-row tapered roller bearing under oscillating external load and speed conditions, which is used to support the main shaft of a large modern direct-drive wind tur

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Mao, Wengui, Nannan Zhang, Dan Feng, and Jianhua Li. "A Proposed Bearing Load Identification Method to Uncertain Rotor Systems." Shock and Vibration 2021 (February 3, 2021): 1–10. http://dx.doi.org/10.1155/2021/6615761.

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Bearings are considered as important mechanical components in rotating machines. Bearing load is used as an indication of monitoring rotor system health, but there are interval and probability uncertain parameters in the process of obtaining bearing load from the rotor system. A bearing load strip enclosed by two bounding distributions is then formed, rather than a single distribution that we usually obtain through the load identification method for a deterministic rotor system. In this paper, a computational inverse approach that combines the interval and perturbation analysis method with reg

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

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

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Yin, Ming Hu, Guo Ding Chen, and Guo Yuan Zhang. "Analysis of Eccentric Load Effect for Tiliting Pad Journal Bearing." Applied Mechanics and Materials 364 (August 2013): 71–75. http://dx.doi.org/10.4028/www.scientific.net/amm.364.71.

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Most of the studies about tilting pad journal bearings are for load-on-pad or load-between-pad tilting pad journal bearings, and for the other loading forms, the performance are often estimated by the performance of the two limited conditions, that may reduce the reliablity of bearing design or lead to waste materials in design. To obtained the influence of the load directions on the static and dynamic characteristics of the tilting pad journal bearing, which is called eccentric load effect in this papers, the performance calculation of the tilting pad journal bearing in different load directi

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Yang, Chun Xia, Qing Qing Liu, Li Juan Sun, and Jian Guo Liang. "Calculating Size Limitations of Non-Load-Bearing Walls under Seismic Loads." Applied Mechanics and Materials 204-208 (October 2012): 2646–52. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.2646.

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Infill walls,etc. non-load-bearing walls are vulnerable to fracture when these are subjected to out-of-plane seismic loads. Studies suggest that the overall dimensions of non-load-bearing walls are the important parameters to affect its out-of-plane mechanical properties, but most of these researches are qualitative researches, do not give specific size limitations. This paper based on codes has calculated out-of-plane loads of non-load-bearing walls, then bearing capacity check formulas have been deduced when non-load-bearing walls are subjected to out-of-plane seismic loads, finally the size

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Jimboh, K., H. Aono, T. Chikata, Y. Hagiwara, K. Nakasu, and T. Hoshino. "Thrust Load Measurement on Aero-Engine Bearing." Journal of Engineering for Gas Turbines and Power 107, no. 1 (1985): 181–86. http://dx.doi.org/10.1115/1.3239680.

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Aero-engine bearings operate in an extraordinarily high speed range (high DN number) and severe conditions. It is especially necessary to measure and adjust the bearing thrust load in the engine development phase, but it is very difficult to measure the thrust load accurately, because bearings and bearing housings are subjected to elevated temperature and oil environment. Open space permitted for installation of thrust measurement transducers is small and limited around the bearing housing. We tried to measure the thrust load by applying “Unit Cells,” which are installed between bearing and be

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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 bear

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35

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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Zhang, Gang, Ming Yan Li, Chang Sun, Jian Zhang, and Hai Long Zhang. "Load Distribution of Cross-Roller Slewing Bearing." Applied Mechanics and Materials 224 (November 2012): 268–71. http://dx.doi.org/10.4028/www.scientific.net/amm.224.268.

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Because of cross roller-slewing bearing structure have a certain degree of particularity, and two sets of cross rollers is equivalent to two columns roller stack situation, therefore it should deduce roller calculation formula for two sets of roller respectively. According to the stress of the slewing bearings, we proceed load distribution calculation synthetically under the center of bearing axial force, overturning moment and radial force. Finally, based on the above formula for calculating the bearing load distribution and through the Matlab software, we analyze the influence of some parame

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Leupold, S., R. Schelenz, and G. Jacobs. "Method to determine the local load cycles of a blade bearing using flexible multi-body simulation." Forschung im Ingenieurwesen 85, no. 2 (2021): 211–18. http://dx.doi.org/10.1007/s10010-021-00457-y.

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AbstractConventional methods for designing rolling bearings against fatigue assume that a bearing ring is fully rotating and that the load is ideally distributed over the rolling elements. Blade bearings in wind turbines, are operated under oscillating motions and dynamic loads. The load distribution is strongly dependent on the stiffness of the bearing rings and the surrounding structural components. This has been shown in numerous studies using FEM simulations for static load cases. In this paper a method is presented that reduces the calculation effort of the deformation of the bearing ring

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Zheng, Yueqing, Tianwei Lai, Shuangtao Chen, Liang Chen, Liqiang Liu, and Yu Hou. "Static characteristics of six pads multilayer protuberant foil thrust bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 231, no. 2 (2016): 158–64. http://dx.doi.org/10.1177/1350650116649328.

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The multilayer protuberant foil bearing, as a new type of compliant surface foil bearing, shows a great and wide application promise. Six pads multilayer protuberant foil thrust bearings with different configurations were designed and fabricated in this study. The static characteristics of these bearings and the effects of their key configuration parameters including the thickness of top foil, the thickness of protuberant foil, and the layers of protuberant foil are investigated. The experimental results reveal that the bearings show nonconstant structural stiffness, and the stiffness mainly d

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Bornstein, K. R. "Dynamic Load Capabilities of Active Electromagnetic Bearings." Journal of Tribology 113, no. 3 (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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Cui, Li. "A new fatigue damage accumulation rating life model of ball bearings under vibration load." Industrial Lubrication and Tribology 72, no. 10 (2020): 1205–15. http://dx.doi.org/10.1108/ilt-05-2019-0180.

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Purpose Bearings in electric machines often work in high speed, light load and vibration load conditions. The purpose of this paper is to find a new fatigue damage accumulation rating life model of ball bearings, which is expected for calculating fatigue life of ball bearings more accurately under vibration load, especially in high speed and light load conditions. Design/methodology/approach A new fatigue damage accumulation rating life model of ball bearings considering time-varying vibration load is proposed. Vibration equations of rotor-bearing system are constructed and solved by Runge–Kut

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Pankhardt, Kinga, and György L. Balázs. "Study of edge strength of load bearing glasses." Epitoanyag - Journal of Silicate Based and Composite Materials 62, no. 1 (2010): 15–22. http://dx.doi.org/10.14382/epitoanyag-jsbcm.2010.4.

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

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

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Schüler, Eckhard, and Olaf Berner. "Improvement of Tilting-Pad Journal Bearing Operating Characteristics by Application of Eddy Grooves." Lubricants 9, no. 2 (2021): 18. http://dx.doi.org/10.3390/lubricants9020018.

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In high speed, high load fluid-film bearings, the laminar-turbulent flow transition can lead to a considerable reduction of the maximum bearing temperatures, due to a homogenization of the fluid-film temperature in radial direction. Since this phenomenon only occurs significantly in large bearings or at very high sliding speeds, means to achieve the effect at lower speeds have been investigated in the past. This paper shows an experimental investigation of this effect and how it can be used for smaller bearings by optimized eddy grooves, machined into the bearing surface. The investigations we

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Zhao, Xiu Xu, An Jian Huang, and Zhi Xiang Hu. "Numerical Analysis of High Power Marine Diesel Engine Main Bearing Load and Lubricating Properties." Applied Mechanics and Materials 331 (July 2013): 25–30. http://dx.doi.org/10.4028/www.scientific.net/amm.331.25.

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The main bearing is one of the primary friction pairs of a diesel engine. The lubrication condition affects the performance of the marine diesel engine directly. Continuous working time of main bearings is longer, load is higher and working condition is even worse especially in low medium speed marine diesel engine, making it difficult to form good dynamic pressure lubrication.Therefore, this paper takes a high-power marine diesel G32 with 9 cylinders as an example, calculates and analyzes the load, the orbit of main shaft center and the minimum thickness of oil film in each main bearing, prov

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Barker, Michael G., and Bryan A. Hartnagel. "Longitudinal Restraint Response of Existing Bridge Bearings." Transportation Research Record: Journal of the Transportation Research Board 1624, no. 1 (1998): 28–35. http://dx.doi.org/10.3141/1624-04.

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Fifteen rocker bridge bearings were cyclically tested to determine their bearing response to simulated seismic longitudinal loads. The objective of the tests was to examine the load-deformation characteristics and energy dissipation capabilities of bearings that have been in service for many years. The results are to be used to determine if existing in-place bearings may be utilized in seismic retrofitting of earthquake-susceptible bridges. The bearings were cycled within working ranges in each direction in the as-received state. The desired friction force hysteretic loops were determined from

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Loriemi, Amin, Georg Jacobs, Sebastian Reisch, Dennis Bosse, and Tim Schröder. "Experimental and simulation-based analysis of asymmetrical spherical roller bearings as main bearings for wind turbines." Forschung im Ingenieurwesen 85, no. 2 (2021): 189–97. http://dx.doi.org/10.1007/s10010-021-00462-1.

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AbstractSymmetrical spherical roller bearings (SSRB) used as main bearings for wind turbines are known for their high load carrying capacity. Nevertheless, even designed after state-of-the-art guidelines premature failures of this bearing type occur. One promising solution to overcome this problem are asymmetrical spherical roller bearings (ASRB). Using ASRB the contact angles of the two bearing rows can be adjusted individually to the load situation occurring during operation. In this study the differences between symmetrical and asymmetrical spherical roller bearings are analyzed using the f

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Li, Yunfeng, and Yuanan Gao. "Internal load distribution of single-row tapered roller bearings doubly supporting main shaft of wind turbine." Advances in Mechanical Engineering 14, no. 5 (2022): 168781322210988. http://dx.doi.org/10.1177/16878132221098895.

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In order to accurately understand the internal loading state of the single-row tapered roller bearings doubly supporting the main shaft of wind turbine, a 5-DOF mechanical model of such bearing combination in wind turbine was established which considered the axial preload, bearing ring tilt, and roller crown. The positions of the points on the bearing raceways were described mathematically in the Cartesian coordinate system, and the mathematical relationship between the roller-raceway contact deformations and the bearing ring displacements was derived. The effect of bearing ring tilt caused by

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Yi, Howon, Hyunsung Jung, Kyuman Kim, and Keun Ryu. "Static Load Characteristics of Hydrostatic Journal Bearings: Measurements and Predictions." Sensors 22, no. 19 (2022): 7466. http://dx.doi.org/10.3390/s22197466.

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Hydrostatic bearings for liquid rocket engine turbopumps provide distinctive advantages, including high load capacity even with low viscosity cryogenic fluid and extending life span by minimizing friction and wear between rotor and bearing surfaces. Application of hydrostatic bearings into turbopumps demands a reliable test database with well-quantified operating parameters and experimentally validated accurate performance predictive tools. The present paper shows the comprehensive experimental data and validation of predicted static load characteristics of hydrostatic journal bearings lubrica

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

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Marine water-lubricated polymer bearings support the propeller shaft that stretches out of the ship. The bending deformation of propeller shaft often leads to journal misalignment, significantly impacting the bearing performance. In this paper, a mixed lubrication model for water-lubricated polymer bearing is established considering the effect of journal misalignment, liner elastic deformation, and local turbulence. The influence of key structural and operating parameters on the performance of water-lubricated bearing with journal misalignment is investigated. The results show that the journal

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Houpert, L. "A Uniform Analytical Approach for Ball and Roller Bearings Calculations." Journal of Tribology 119, no. 4 (1997): 851–58. http://dx.doi.org/10.1115/1.2833896.

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A novel analytical approach is proposed, uniform for ball and roller bearings, which takes into account 5 relative race displacements (3 translations: dx, dy, and dz, and 2 tilting angles: dθy and dθz) to provide simple analytical relationships for calculating directly the resulting 3 bearing loads: Fx, Fy, and Fz as well as the 2 tilting moments: My and Mz. A full coupling between all these displacements and forces is considered. The maximum rolling element load Qmax, the load distribution Q(Ψ) and the 3-D rolling element load distribution dQ(Ψ, x′) at each roller-race contact slice are also

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