Relevant bibliographies by topics / Bearing life

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Bearing life'

Author: Grafiati
Published: 4 June 2021
Last updated: 17 February 2022

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Journal articles on the topic "Bearing life"

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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 (April 23, 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 truck with the consideration of the mixing drum’s vibration. The effects of rotating speed, inclination angle, concrete liquid level, and rolling wheels’ supporting position on the roller load and bearing’s fatigue life are studied with a specific example with and without considering the mixing drum’s vibration. Results show that with the increase in the rotating speed, the bearing roller’s maximum load decreases, while the fatigue life of main supporting bearing increases. With the decrease of the concrete liquid level, there is increase in the inclination angle and the movement of rolling wheel from left to right, and the bearing roller’s maximum load increases, while the fatigue life of main supporting bearing decreases. The changes of the mixing drum’s inclination angle have tremendous effect on bearing’s fatigue life, while the change in the rolling wheel’s supporting position has little influence on the fatigue life of the main supporting bearing. When considering the mixing drum’s vibration, the roller’s maximum load is larger than that without considering mixing drum’s vibration, while the fatigue life of the main supporting bearing is shorter than that without considering mixing drum’s vibration.
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SPM Instrument UK Ltd. "Maximizing bearing life." NDT & E International 25, no. 2 (1992): 107. http://dx.doi.org/10.1016/0963-8695(92)90624-p.

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Tallian, T. E. "Rolling Bearing Life Prediction. Corrections for Material and Operating Conditions. Part I: General Model and Basic Life." Journal of Tribology 110, no. 1 (January 1, 1988): 2–6. http://dx.doi.org/10.1115/1.3261570.

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Computer based rolling bearing analysis programs exist which provide models for load and stress distribution, EHD conditions, heat balance and fatigue life prediction for rolling bearings and machine assemblies comprising such bearings. Fatigue life prediction is generally based on the ANSI standard. This two-part paper offers correction factors for refining the life prediction by modeling effects of material and operating variables. The corrections can be applied to the ANSI-predicted life of a complete bearing or to predicted lives of stressed volume elements in the bearing, with subsequent summation over the stressed volumes. Formulations are presented with a view to their incorporation into dynamic bearing analysis computer programs. This first part of the paper comprises the general model, basic life calculation and the nomenclature for both parts of the paper.
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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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Guo, Wei, Hongrui Cao, Zhengjia He, and Laihao Yang. "Fatigue Life Analysis of Rolling Bearings Based on Quasistatic Modeling." Shock and Vibration 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/982350.

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Rolling bearings are widely used in aeroengine, machine tool spindles, locomotive wheelset, and so forth. Rolling bearings are usually the weakest components that influence the remaining life of the whole machine. In this paper, a fatigue life prediction method is proposed based on quasistatic modeling of rolling bearings. With consideration of radial centrifugal expansion and thermal deformations on the geometric displacement in the bearings, the Jones’ bearing model is updated, which can predict the contact angle, deformation, and load between rolling elements and bearing raceways more accurately. Based on Hertz contact theory and contact mechanics, the contact stress field between rolling elements and raceways is calculated. A coupling model of fatigue life and damage for rolling bearings is given and verified through accelerated life test. Afterwards, the variation of bearing life is investigated under different working conditions, that is, axial load, radial load, and rotational speed. The results suggested that the working condition had a great influence on fatigue life of bearing parts and the order in which the damage appears on bearing parts.
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Zheng, Yuhuang. "Predicting Remaining Useful Life Based on Hilbert–Huang Entropy with Degradation Model." Journal of Electrical and Computer Engineering 2019 (February 3, 2019): 1–11. http://dx.doi.org/10.1155/2019/3203959.

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Prognostics health management (PHM) of rotating machinery has become an important process for increasing reliability and reducing machine malfunctions in industry. Bearings are one of the most important equipment parts and are also one of the most common failure points. To assess the degradation of a machine, this paper presents a bearing remaining useful life (RUL) prediction method. The method relies on a novel health indicator and a linear degradation model to predict bearing RUL. The health indicator is extracted by using Hilbert–Huang entropy to process horizontal vibration signals obtained from bearings. We present a linear degradation model to estimate RUL using this health indicator. In the training phase, the degradation detection threshold and the failure threshold of this model are estimated by the distribution of 600 bootstrapped samples. These bootstrapped samples are taken from the six training sets. In the test phase, the health indicator and the model are used to estimate the bearing’s current health state and predict its RUL. This method is suitable for the degradation of bearings. The experimental results show that this method can effectively monitor bearing degradation and predict its RUL.
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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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Li, Chun Shu, Guang Ming Yuan, and Hao Feng. "Stress Analysis and Fatigue Life Estimation of Bridge Rubber Bearing." Advanced Materials Research 748 (August 2013): 345–49. http://dx.doi.org/10.4028/www.scientific.net/amr.748.345.

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Rubber bearings are used widely in small and medium-span highway bridge structure. In this paper the transient dynamics of the plate rubber bearing and the pot rubber bearing which are widely used in practical engineering is analyzed. And the fatigue life of bridge bearing is estimated using reliability theory
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Gao, Tianhong, Yuxiong Li, Xianzhen Huang, and Changli Wang. "Data-Driven Method for Predicting Remaining Useful Life of Bearing Based on Bayesian Theory." Sensors 21, no. 1 (December 29, 2020): 182. http://dx.doi.org/10.3390/s21010182.

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Bearings are some of the most critical industrial parts and are widely used in various types of mechanical equipment. Bearing health status can have a significant impact on the overall equipment performance, and bearing failures often cause serious economic losses and even casualties. Thus, estimating the remaining useful life (RUL) of bearings in real time is of utmost importance. This paper proposes a data-driven RUL prediction method for bearings based on Bayesian theory. First, time-domain features are extracted from the bearing vibration signal and data are fused to build a health indicator (HI) and a state model of bearing degradation. Then, according to Bayesian theory, a Bayesian model of state parameters and bearing life is established. The parameters of the Bayesian model are updated and bearing RUL is predicted by the Metropolis–Hastings algorithm. The method was validated by the XJTU-SY bearing open datasets and the prediction results are compared with the existing methods. Accuracy of the proposed method was demonstrated.
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Oh, Se Doo, and Young Ze Lee. "Tribological Performance of Two Oilless Sintered-Metal Bearings for the Geared Motor in a Refrigerator." Key Engineering Materials 321-323 (October 2006): 1552–55. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.1552.

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The tribological performances of two types of oilless sintered-metal bearings with varying loads were investigated. One is the Cu-based bearing and the other is Fe-based bearing. The frictional forces of the bearings were measured using the bearing tester. By measuring the change of weight before and after sliding tests, the oil losses of the bearings were surveyed. Also, PV curves, which could be used to predict the life of the oilless bearing, were plotted. By observing the roundness, the cylindericity and the images of scanning electron microscopy of bearings before and after sliding tests, the tribological characteristics of the bearings were evaluated. It was found that Fe-based bearing show lower friction, more oil loss, less wear and longer life than Cu-based bearing.
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Dissertations / Theses on the topic "Bearing life"

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Biboulet, Nans. "Influence of indentations on rolling bearing life." Phd thesis, INSA de Lyon, 2008. http://tel.archives-ouvertes.fr/tel-00663264.

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Les lubrifiants contiennent des particules qui sont à la fois initialement présentes dans le lubrifiant et dans le mécanisme (fabrication, stockage ) ; générées durant le rodage, par usure ou corrosion ; ou bien issues de sources externes. Les particules détériorent les surfaces en créant des indents lorsqu'elles sont piégées dans les contacts. Ces indents augmentent le risque de rupture par fatigue en induisant des perturbations de pression et de contraintes. Ce travail est basé sur une étude des contacts indentés secs et lubrifiés (EHD). L'équation de Reynolds en fluide Newtonien est utilisée. Les techniques mutigrilles et multi-intégration sont employées. L'objectif de ce travail est de proposer un modèle de prédiction des perturbations des champs de pression et de contraintes, et finalement un modèle de réduction de durée de vie des contacts indentés en fonction de la géométrie des indents et des conditions de contact.
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Riddle, Paul W. "Equipped to share : a curriculum for workplace evangelism /." Online full text .pdf document, available to Fuller patrons only, 2003. http://www.tren.com.

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Thompson, Jeffery Will. "A personal testimony workshop for the First Baptist Church of Chelsea, Oklahoma." Theological Research Exchange Network (TREN), 1996. http://www.tren.com.

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Marr, Carroll D. "Developing and implementing a lifestyle evangelism program with a select group of adult members of Zoar Baptist Church, Baton Rouge, Louisiana." Theological Research Exchange Network (TREN), 1997. http://www.tren.com.

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Miles, J. Matthew. "Developing a program of holistic evangelism for the First Baptist Church of Stillwater, Oklahoma." Online full text .pdf document, available to Fuller patrons only, 2001. http://www.tren.com.

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Rasiulis, Nicolas. "Freestyle Bearing: Work, Play, and Synergy in the Practice of Everyday Life Among Mongolian Reindeer Pastoralists." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/34449.

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Approximately 200 people, mostly Dukhas of Tuvan ancestry, live nomadically with reindeer, horses, and dogs as ‘Tsaatans’ in the taiga of northern Mongolia. How do they effectively realize their livelihoods? Does qualifying corporeal manners, or bearings, in which livelihood practices are performed in the moments of actualization offer insight into ways in which longer-term decision-making processes like nomadic settlement and livestock management are embodied? Informed by a phenomenological approach in anthropology during nearly four months of cooperative co-habitation with Tsaatan mentors, I argue that Tsaatans effectively realize livelihood practices as they cheerfully embody poised improvisation and acrobatics in both skillful discernment and movement. Simultaneously anticipating and performing diverse tasks in playful cooperation with friends, family and other animals along nomadic lifestyles in a wilderness habitat involves persistent, sensory-rich, versatile manipulation of environmental materials, as well as extensive geographic knowledge and frequent experiences of risk in remote, rugged terrain and powerful meteorological conditions impossible to completely avoid. These lifestyles catalyze the development of quick-witted and materially sensitive resilience with which people are capable of corresponding with beings, materials, and situations, and thereby of continuing to develop ancestral traditions of reindeer husbandry in a rapidly changing social, economic, technological and geo-political context.
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Johnstone, Nicola. "How load bearing can influence cognitive performance : investigated using mobile electroencephalography (EEG) recordings in real-life settings." Thesis, University of Surrey, 2018. http://epubs.surrey.ac.uk/845540/.

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Physical load carriage is an essential duty for military personnel. Physical load carriage induces psychological and physiological effects, but the influence of load carriage on brain activity and subsequent cognitive performance is largely unknown. This due to difficulties in disentangling the subtle behavioural effects under load carriage in complex occupational settings. To investigate how load carriage influences cognition directly, continuous measures of brain activity must be obtained in realistic settings. Mobile EEG is ideally suited to this task. Across four studies, mobile EEG recordings were used to assess to what extent load carriage influences attention. Four objectives were defined. 1. To evaluate mobile EEG as a viable tool in real-life settings (studies 1-4). 2. Investigate the influence of walking on attentional processes (study 1, selective attention; study 2, change detection). 3. Establish the impact of load carriage on brain activity during walking (study 3). 4. Assess the interaction of load carriage on attentional processes during walking (study 4). Interpretations of resulting data were conceptualised in the proposed dynamic resource allocation model of cognitive performance. Successful application of Mobile EEG was evident and found signal quality comparable to EEG recorded in a laboratory. Moreover, walking influenced attentional processes in an indirect way, moderated by the environment and concurrent perceptual load. While a steady state neural index of walking was recorded in a natural setting, this was invulnerable to load carriage effects. Further, and most pressing for this thesis, load carriage had little influence on neural indices of attention. Despite this, there is some indication from the data that fatigue plays a prominent role in the interaction of load carriage and cognitive function, and further exploring the neural underpinnings of motivation may prove fruitful in future studies of load carriage and cognitive function.
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Hari, Rohit. "KNOWLEDGE DISCOVERY USING DATA ANALYSIS TECHNIQUES AND INVERSE EXTREME VALUE STATISTICS TO BETTER PREDICT LIFE OF A BEARING." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366304299.

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Kucukyilmaz, Ali. "Experimental Investigation Of Residual Stresses Introduced Via Shot Peening And Their Effect On Fatigue Life Of Ball Bearings." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/2/12611494/index.pdf.

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In this study, residual stresses introduced via application of shot peening on the raceways of bearing rings and their effect on the fatigue life was investigated experimentally. For improvement of residual compressive stress state, shot peening operation with different parameters was utilized. Residual stress measurements were conducted via X-ray diffraction technique. Optimization of residual stress state during the production of ball bearings is the main target of this study. Process parameters for shot peening and super-finishing were studied for determination of the parameters that induce the most favorable residual stress state. The fatigue life of ball bearings were determined by life cycle tests and tabulated to show the results of the study. The results of the thesis are believed to help for optimization of residual stress distribution and improvement of service life of ball bearings.
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Eroglu, Baris. "Inner Ring Fatigue Analysis Of Rolling Element Bearings." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610421/index.pdf.

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Rolling element bearings are the one of the most widely used machine elements in the industry. The most important criterion in bearing selection is the endurance life. The first attempts on the prediction of the endurance life of rolling elements bearings are done by Lundberg and Palmgren in 1950s (Harris, 1999). Their work adopted as an ANSI, ABMA and ISO standard which is widely used in industry today. The basic assumption of Lundberg-Palmgren formulation is that no matter how small the load applied on rolling element bearing, all material in the stressed volume is subject to fatigue failure. In this study, four main life theories
Weibull, Lundberg-Palmgren, Ioannides-Harris, and Zaretsky on rolling element bearings have been investigated. Three-dimensional finite element models of a bearing&rsquo
s inner ring and rolling element have been prepared. The stress fields within the inner ring and the ball with respect to the applied load are obtained numerically. The fatigue life of the inner ring has been predicted by two methods that are widely used for fatigue analysis
Total Life Analysis (S-N method) and Crack Initiation Analysis (&
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-N method). Obtained results are compared with ISO formulation. As a result of the investigation, S-N and &
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-N methods are determined to give more conservative results than ISO method for higher loads that cause stresses above the fatigue limit of the material. The used methods for bearing life prediction recognize the existence of the fatigue limit stress. Hence as the stresses within an operating bearing do not exceed the limit stress, the bearing can achieve infinite life. It is also observed that load variation has a direct influence on the bearing life. When the load significantly changes from the levels which create stress above the fatigue limit to the levels that result stress is below the fatigue limit, the bearing would have higher endurance life than predicted by ISO method.
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Books on the topic "Bearing life"

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1954-, Dorsey Jim, ed. Evangelism in everyday life: Sharing and shaping your faith. Kansas City, Mo: Beacon Hill Press of Kansas City, 1998.

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Graham, Ferne. Catching the vision: Witness for life. [Toronto]: United Church of Canada. Division of Mission in Canada, 1989.

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Unbinding the Gospel: Real life evangelism. St. Louis, Mo: Chalice Press, 2008.

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Zaretsky, Erwin V. A. palmgren revisited--a basis for bearing life prediction. [Washington, DC]: National Aeronautics and Space Administration, 1997.

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Zaretsky, Erwin V. A. palmgren revisited--a basis for bearing life prediction. [Washington, DC]: National Aeronautics and Space Administration, 1997.

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Zaretsky, Erwin V. A. palmgren revisited--a basis for bearing life prediction. [Washington, DC]: National Aeronautics and Space Administration, 1997.

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Zaretsky, Erwin V. A. palmgren revisited--a basis for bearing life prediction. [Washington, DC]: National Aeronautics and Space Administration, 1997.

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Wynne, Michelle. Encountering God: Processing life through God's checkout. Rotorua] New Zealand: Michelle Wynne, 2015.

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Kim, Frank. How to share your faith with inspiring, real-life stories from around the world. Woburn, Mass: Discipleship Publications International, 1998.

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Zaretsky, Erwin V. Selection [of] rolling-element bearing steels for long-life application. [Washington, D.C.]: National Aeronautics and Space Administration, 1986.

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Book chapters on the topic "Bearing life"

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Lugt, P. M., and A. Gabelli. "Grease Lubrication and Bearing Life." In Grease Lubrication in Rolling Bearings, 283–308. Oxford, UK: John Wiley & Sons Ltd, 2012. http://dx.doi.org/10.1002/9781118483961.ch13.

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Trojahn, Werner, and Silke Rösch. "Steel Cleanliness and Bearing Life." In Bearing Steel Technologies: 9th Volume, Advances in Rolling Contact Fatigue Strength Testing and Related Substitute Technologies, 102–13. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2012. http://dx.doi.org/10.1520/stp104298.

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Trojahn, Werner, and Silke Rösch. "Steel Cleanliness and Bearing Life." In Bearing Steel Technologies: 9th Volume, Advances in Rolling Contact Fatigue Strength Testing and Related Substitute Technologies, 1–12. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2012. http://dx.doi.org/10.1520/stp104298t.

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Neglia, Silvio Giuseppe, Antonio Culla, and Annalisa Fregolent. "Bearing Cage Dynamics: Cage Failure and Bearing Life Estimation." In Nonlinear Dynamics, Volume 1, 491–504. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-15221-9_43.

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Xiangduo, Peng, Yasuyuki Shimizu, and Nobuaki Mitamura. "Long Life Bearing Technologies on Material Aspect." In Advanced Tribology, 932–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03653-8_319.

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Trivedi, Hitesh K., Lewis Rosado, David T. Gerardi, Garry D. Givan, and Bryan McCoy. "Fatigue Life Performance of Hybrid Angular Contact Pyrowear 675 Bearings." In Bearing Steel Technologies: 11th Volume, Advances in Steel Technologies for Rolling Bearings, 275–95. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2017. http://dx.doi.org/10.1520/stp160020170003.

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Dinkel, Markus, and Werner Trojahn. "Influence of Sulfur Inclusion Content on Rolling Contact Fatigue Life." In Bearing Steel Technologies: 10th Volume, Advances in Steel Technologies for Rolling Bearings, 1–17. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2014. http://dx.doi.org/10.1520/stp158020140059.

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Macdonald, Alister. "The High Pressure Micro-environment of Vertebrate Load Bearing Joints." In Life at High Pressure, 71–83. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67587-5_3.

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Gabelli, Antonio, and Guillermo E. Morales-Espejel. "Improved Fatigue Life Analysis of Pre-Dented Raceways Used in Bearing Material Testing." In Bearing Steel Technologies: 11th Volume, Advances in Steel Technologies for Rolling Bearings, 167–91. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2017. http://dx.doi.org/10.1520/stp160020160154.

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Kirsch, Mathew, and Hitesh Trivedi. "Microstructural Changes in Aerospace Bearing Steels under Accelerated Rolling Contact Fatigue Life Testing." In Bearing Steel Technologies: 11th Volume, Advances in Steel Technologies for Rolling Bearings, 92–107. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2017. http://dx.doi.org/10.1520/stp160020170005.

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Conference papers on the topic "Bearing life"

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Lee, Seungpyo. "Bearing Life Optimization for Automotive Wheel Bearings." In Brake Colloquium & Exhibition - 37th Annual. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2019. http://dx.doi.org/10.4271/2019-01-2137.

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Tibbits, Patrick A. "FEM Simulation and Life Optimization of Tandem Roller Thrust Bearing." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84234.

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Tandem thrust roller bearings carry high axial loads in rotary equipment such as mud pumps or extruders. Deflection of the bearing plates redistributes loads over rollers, and affects bearing life. In this study, solid finite elements modeled a shaft, housing and two stages of bearing plates. A line of spring elements represented each row of rollers. The stiffness of the line of spring elements modeled the stiffness of each roller/raceway non-Hertzian line contact. Modification of the spring element stiffness compensated for the compliance of the nodes of solid elements that modeled the bearing plates. This construct avoided computationally expensive surface-to-surface contact calculations. Further computational savings accrued from modeling the bearing and shaft assembly as axisymmetric. Program output included deflection of the bearing plates and a listing of spring element forces, which characterized the distribution of load over the length of the rollers. Bearings with optimized geometry had decreased maximum contact stress, more uniform distribution of contact stress over the length of each roller, and longer estimated rolling contact fatigue life.
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Wang, Peng, Ruqiang Yan, and Robert X. Gao. "Multi-Mode Particle Filter for Bearing Remaining Life Prediction." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6638.

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As a critical element in rotating machines, remaining useful life (RUL) prediction of rolling bearings plays an essential role in realizing predictive and preventative machine maintenance in modern manufacturing. The physics of defect (e.g. spall) initiation and propagation describes bearing’s service life as generally divided into three stages: normal operation, defect initiation, and accelerated performance degradation. The transition among the stages are embedded in the variations of monitored data, e.g., vibration. This paper presents a multi-mode particle filter (MMPF) that is aimed to: 1) automatically detect the transition among the three life stages; and 2) accurately characterize bearing performance degradation by integrating physical models with stochastic modeling method. In MMPF, a set of linear and non-linear modes (also called degradation functions) are first defined according to the physical/empirical knowledge as well as statistical analysis of the measured data (e.g. vibration). These modes are subsequently refined during the particle filtering (PF)-based bearing performance tracking process. Each mode corresponds to an individual performance scenario. A finite-state Markov chain switches among these modes, reflecting the transition between the service life stages. Case studies performed on two run-to-failure experiments indicate that the developed technique is effective in tracking the evolution of bearing performance degradation and predicting the remaining useful life of rolling bearings.
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Hong, Jie, Xuewen Miao, Lei Han, and Yanhong Ma. "Prognostics Model for Predicting Aero-Engine Bearing Grade-Life." In ASME Turbo Expo 2009: Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-59641.

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Development of practical and verifiable prognostic approaches for service life of gas turbine engine bearings will play a critical role in improving the reliability and safety of aircraft engines. Upgrading current military aeroengine overhaul metrics based strictly on engine flight hours and total accumulated cycles with higher fidelity prognostic models will provide an opportunity to prevent failures caused by accelerated degradation due to operation in unusually harsh conditions, and will help avoid unnecessary maintenance caused by routine check on engines that operate under nominal operating conditions. Grade-life (GL) is used to describe the bearing’s service life, and a comprehensive engine bearing prognostic model comprised of a physics based mathematical model and a prognostic element is presented in this paper. The mathematical model utilizes information from the Sensed Data module to calculate the cumulative damage sustained by the bearing since it was first installed and the Prediction Grade-life (PGL) is captured. The prognostic estimate model is an empirical lifetime model, in which Empirical Grade-life (EGL) is assessed based on vibration signals intelligently. The final Grade-life of bearings is determined by fusion of analytic Grade-life (PGL) and Grade-life assessment value (EGL) based on Fuzzy Logic Inference, which reduces the uncertainty’s affection towards prediction results of the analytic model. Finally, bearing test stand run-to-failure data is used to verify the approach.
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Lee, Seungpyo. "Bearing Life Evaluation for Automotive Wheel Bearings Using Design of Experiments." In Brake Colloquium & Exhibition - 36th Annual. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2018. http://dx.doi.org/10.4271/2018-01-1903.

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Zaretsky, Erwin V., Brian L. Vlcek, and Robert C. Hendricks. "Effect of Silicon Nitride Balls and Rollers on Rolling Bearing Life." In ASME/STLE 2004 International Joint Tribology Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/trib2004-64246.

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Three decades have passed since the introduction of silicon nitride rollers and balls into conventional rolling-element bearings. For a given applied load, the contact (Hertz) stress in a hybrid bearing will be higher than an all-steel rolling-element bearing. The silicon nitride rolling-element life as well as the lives of the steel races were used to determine the resultant bearing life of both hybrid and all-steel bearings. Life factors were determined and reported for hybrid bearings. Under nominal operating speeds, the resultant calculated lives for deep-groove, angular-contact, and cylindrical-roller hybrid bearings are respectively, 3.8, 3.3, and 5.5 times that using the Lundberg-Palmgren equations. An all-steel bearing under the same load and nominal operating speeds will always have higher life than the equivalent hybrid bearing operating under the same conditions. Under these conditions, hybrid bearings are predicted to have a lower fatigue life than the all-steel bearings by 58 percent for deep-groove bearings, 41 percent for angular-contact bearings and 28 percent for cylindrical roller bearings.
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Schroder, J., A. AlDarwaish, J. W. Richards, M. Di Pasquale, M. Mohamed, and Jesse Yorty. "Extending Bit Life Through Bearing Innovations." In SPE/IADC Drilling Conference and Exhibition. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/173031-ms.

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Orsagh, Rolf, Michael Roemer, Jeremy Sheldon, and Christopher J. Klenke. "A Comprehensive Prognostics Approach for Predicting Gas Turbine Engine Bearing Life." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53965.

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Development of practical and verifiable prognostic approaches for gas turbine engine bearings will play a critical role in improving the reliability and availability of legacy and new acquisition aircraft engines. In addition, upgrading current United States Air Force (USAF) engine overhaul metrics based strictly on engine flight hours (EFH) and total accumulated cycles (TAC) with higher fidelity prognostic models will provide an opportunity to prevent failures in engines that operate under unusually harsh conditions, and will help avoid unnecessary maintenance on engines that operate under unusually mild conditions. A comprehensive engine bearing prognostic approach is presented in this paper that utilizes available sensor information on-board the aircraft such as rotor speed, vibration, lube system information and aircraft maneuvers to calculate remaining useful life for the engine bearings. Linking this sensed data with fatigue-based damage accumulation models based on a stochastic version of the Yu-Harris bearing life equations with projected engine operation conditions is implemented to provide the remaining useful life assessment. The combination of health monitoring data and model-based techniques provides a unique and knowledge rich capability that can be utilized throughout the bearing’s entire life, using model-based estimates when no diagnostic indicators are present and using the monitored features such as oil debris and vibration at later stages when failure indications are detectable, thus reducing the uncertainty in model-based predictions. A description and initial implementation of this bearing prognostic approach is illustrated herein, using bearing test stand run-to-failure data and engine test cell data.
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Doiron, H. H., L. B. Tompkins, and T. Watts. "Optimizing Journal Bearing Insert Bit Runs Using a Bearing Life Model." In SPE Annual Technical Conference and Exhibition. Society of Petroleum Engineers, 1987. http://dx.doi.org/10.2118/16697-ms.

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Seong, Sulki, Wangoo Kim, Daesung Bae, Seungpyo Lee, Younggeol Cho, and Kyeongdeok Yang. "A Bearing Endurance Life Prediction Method Considering the Bearing Dynamic Characteristics." In SAE 2015 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2015. http://dx.doi.org/10.4271/2015-01-0494.

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Reports on the topic "Bearing life"

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Harris, T., J. H. Rumbarger, and C. P. Butterfield. Wind Turbine Design Guideline DG03: Yaw and Pitch Rolling Bearing Life. Office of Scientific and Technical Information (OSTI), December 2009. http://dx.doi.org/10.2172/969722.

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Meeks, Crawford, and Elias Polendo. Computerized Design and Life Prediction - Bearings. Fort Belvoir, VA: Defense Technical Information Center, April 1995. http://dx.doi.org/10.21236/ada315515.

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Thompson, III, Durfee Andrew A., and Gary L. Techniques for Evaluating Line of Bearing (LOB) Systems. Fort Belvoir, VA: Defense Technical Information Center, September 1992. http://dx.doi.org/10.21236/ada254832.

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Vega, L. A. Accelerated life test of the USDOE OC-OTEC experimental system refurbished with magnetic bearings for the 3rd stage vacuum compressor. Final report. Office of Scientific and Technical Information (OSTI), April 1997. http://dx.doi.org/10.2172/663602.

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Han, Fei, Monica Prezzi, Rodrigo Salgado, Mehdi Marashi, Timothy Wells, and Mir Zaheer. Verification of Bridge Foundation Design Assumptions and Calculations. Purdue University, 2020. http://dx.doi.org/10.5703/1288284317084.

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The Sagamore Parkway Bridge consists of twin parallel bridges over the Wabash River in Lafayette, IN. The old steel-truss eastbound bridge was demolished in November 2016 and replaced by a new seven-span concrete bridge. The new bridge consists of two end-bents (bent 1 and bent 8) and six interior piers (pier 2 to pier 7) that are founded on closed-ended and open-ended driven pipe piles, respectively. During bridge construction, one of the bridge piers (pier 7) and its foundation elements were selected for instrumentation for monitoring the long-term response of the bridge to dead and live loads. The main goals of the project were (1) to compare the design bridge loads (dead and live loads) with the actual measured loads and (2) to study the transfer of the superstructure loads to the foundation and the load distribution among the piles in the group. This report presents in detail the site investigation data, the instrumentation schemes used for load and settlement measurements, and the response of the bridge pier and its foundation to dead and live loads at different stages during and after bridge construction. The measurement results include the load-settlement curves of the bridge pier and the piles supporting it, the load transferred from the bridge pier to its foundation, the bearing capacity of the pile cap, the load eccentricity, and the distribution of loads within the pier’s cross section and among the individual piles in the group. The measured dead and live loads are compared with those estimated in bridge design.
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Mascagni, Giulia, Roel Dom, and Fabrizio Santoro. The VAT in Practice: Equity, Enforcement and Complexity. Institute of Development Studies (IDS), January 2021. http://dx.doi.org/10.19088/ictd.2021.002.

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The value added tax (VAT) is supposed to be a tax on consumption that achieves greater economic efficiency than alternative indirect taxes. It is also meant to facilitate enforcement through the ‘self-enforcing mechanism’ – based on opposed incentives for buyers and sellers, and because of the paper trail it creates. Being a rather sophisticated tax, however, the VAT is complex to administer and costly to comply with, especially in lower-income countries. This paper takes a closer look at how the VAT system functions in practice in Rwanda. Using a mixed-methods approach, which combines qualitative information from focus group discussions with the analysis of administrative and survey data, we document and explain a number of surprising inconsistencies in the filing behaviour of VAT-remitting firms, which lead to suboptimal usage of electronic billing machines, as well as failure to claim legitimate VAT credits. The consequence of these inconsistencies is twofold. It makes it difficult for the Rwanda Revenue Authority to exploit its VAT data to the fullest, and leads to firms, particularly smaller ones, bearing a higher VAT burden than larger ones. There are several explanations for these inconsistencies. They appear to lie in a combination of taxpayer confusion, fear of audit, and constraints in administrative capacity.
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