Relevant bibliographies by topics / Rolling elements

Contents

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

Academic literature on the topic 'Rolling elements'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

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Journal articles on the topic "Rolling elements"

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Ahmed, R., and M. Hadfield. "Rolling contact fatigue behaviour of thermally sprayed rolling elements." Surface and Coatings Technology 82, no. 1-2 (July 1996): 176–86. http://dx.doi.org/10.1016/0257-8972(95)02736-x.

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Gupta, P. K., and B. Paul. "Advanced Dynamics of Rolling Elements." Journal of Applied Mechanics 53, no. 3 (September 1, 1986): 731–32. http://dx.doi.org/10.1115/1.3171847.

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Gentle, C. R. "Advanced dynamics of rolling elements." Tribology International 18, no. 3 (June 1985): 199. http://dx.doi.org/10.1016/0301-679x(85)90151-3.

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Kobzova, I. O. "Contact characteristics for rolling elements in hydraulic cylinder rolling guides." Systems. Methods. Technologies, no. 2(30) (2016): 59–64. http://dx.doi.org/10.18324/2077-5415-2016-2-59-64.

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Schirra, T., G. Martin, S. Puchtler, and E. Kirchner. "Electric impedance of rolling bearings - Consideration of unloaded rolling elements." Tribology International 158 (June 2021): 106927. http://dx.doi.org/10.1016/j.triboint.2021.106927.

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Gopalakrishnan, M. V., R. Krishnamurthy, and C. V. Golkularathnam. "Rolling contact fatigue studies on spray formed ceramics composite rolling elements." Journal of Materials Processing Technology 185, no. 1-3 (April 2007): 233–37. http://dx.doi.org/10.1016/j.jmatprotec.2006.03.147.

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Tomovic, Radoslav. "Investigation of the Effect of Rolling Bearing Construction on Internal Load Distribution and the Number of Active Rolling Elements." Advanced Materials Research 633 (January 2013): 103–16. http://dx.doi.org/10.4028/www.scientific.net/amr.633.103.

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One of the most important characteristics of a rolling bearing is the load distribution on rolling elements. This paper provides an analysis on the influence of the internal construction of rolling bearings on load distribution and the number of active rolling elements. The analysis was performed using a new mathematical model for the boundary level calculations of the bearing deflection and external radial load for the inner ring support onqrolling bearing elements. The model considers two boundary positions of inner ring support on an even and odd number of rolling elements. The developed model enables a very simple determination of the number of active rolling elements participating in an external load transfer, depending on the bearing type and internal radial clearance.
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Krynke, Marek, Ludwik Kania, and Eugeniusz Mazanek. "Modelling the Contact between the Rolling Elements and the Raceways of Bulky Slewing Bearings." Key Engineering Materials 490 (September 2011): 166–78. http://dx.doi.org/10.4028/www.scientific.net/kem.490.166.

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In slewing bearings, a great number of contact pairs are present on the contact surfaces between the rolling elements and raceways of the bearing. Computations to determine the load of the individual rolling elements, taking into account the flexibility of the bearing ring, are most often carried out using the finite element method. Construction of a FEM full model of the bearing, taking into account the shape of the rolling elements and the determination of the contact problem for every rolling element, leads to a singularity of stiffness matrix, which in turn makes the problem impossible to solve. In FEM models the rolling elements are replaced by one-dimensional finite elements (linear elements) to simplify the computation procedure and to obtain an optimal time for computations. The methods of modelling the rolling elements in the slewing bearing, in which balls have been replaced by truss elements with a material non-linear characteristic located between the raceway centres of the curvatures in their axial section, are presented in the paper.
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Karaszewski, Waldemar. "Hertzian Crack Propagation in Ceramic Rolling Elements." Key Engineering Materials 598 (January 2014): 92–98. http://dx.doi.org/10.4028/www.scientific.net/kem.598.92.

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The properties of ceramics, specifically low density, high hardness, high temperature capability and low coefficient of thermal expansion are of most interest to rolling element manufacturers. The influence of ring crack size on rolling contact fatigue failure has been studied using numerical fracture analysis. Such cracks are very often found on ceramic bearing balls and decrease fatigue life rapidly. The numerical calculation are based on a three dimensional model for the ring crack propagation. The stress intensity factors along crack front are analyzed using a three-dimensional boundary element model. The numerical analysis is verified by experimental studies.
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Prashad, Har. "Diagnosis of Rolling-Element Bearings Failure by Localized Electrical Current Between Track Surfaces of Races and Rolling-Elements." Journal of Tribology 124, no. 3 (May 31, 2002): 468–73. http://dx.doi.org/10.1115/1.1467638.

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The diagnosis and cause analysis of rolling-element bearing failure have been well studied and established in literature. Failure of bearings due to unforeseen causes were reported as: puncturing of bearings insulation; grease deterioration; grease pipe contacting the motor base frame; unshielded instrumentation cable; the bearing operating under the influence of magnetic flux, etc. These causes lead to the passage of electric current through the bearings of motors and alternators and deteriorate them in due course. But, bearing failure due to localized electrical current between track surfaces of races and rolling-elements has not been hitherto diagnosed and analyzed. This paper reports the cause of generation of localized current in presence of shaft voltage. Also, it brings out the developed theoretical model to determine the value of localized current density depending on dimensional parameters, shaft voltage, contact resistance, frequency of rotation of shaft and rolling-elements of a bearing. Furthermore, failure caused by flow of localized current has been experimentally investigated.
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Dissertations / Theses on the topic "Rolling elements"

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Halverson, Peter Andrew. "Multi-stable Compliant Rolling-contact Elements." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1832.pdf.

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Mutyala, Kalyan Chakravarthi. "Influence of Metallic, Dichalcogenide, and Nanocomposite Tribological Thin Films on The Rolling Contact Performance of Spherical Rolling Elements." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1447751680.

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Wang, Ying. "Failure modes of silicon nitride rolling elements with ring crack defects." Thesis, Bournemouth University, 2001. http://eprints.bournemouth.ac.uk/427/.

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High quality silicon nitride ceramics have shown some advantages for rolling element bearing applications. In particular hybrid bearings (silicon nitride rolling elements and steel races) have the ability to withstand high loads, severe environments and high speeds. However, the difficulties of both sintering and machining the material may result in surfacedefects,such as surface ring cracks. It is difficult to detect surface ring cracks during high volume production processes and hence it is crucially important to understand their influence and the fundamental mechanism of the failures they cause. The purpose of this study is to examine the contact fatigue failure modes of silicon nitride rolling elements with surface ring crack defects. In this study, new experimental and computational techniques are developed to measure and model the interaction of the surface with pre-existing crack defects. A rolling contact fatigue test method is devised for positioning the ring crack in the contact path. Rolling contact fatigue tests are conducted using a modified four-ball machine in a hybrid ceramic/steel combination. A three-dimensional boundary element model is used to determine the stress intensity factors and to carry out the crack face contact analysis. Research shows that the RCF life performance of silicon nitride bearing elements is dependent upon the crack location and fatigue spall happens only at a few crack orientations. The spalling fatigue failure is not only influenced by the original ring crack propagation but also strongly influenced by the subsequent crack face contact. Secondary surface cracks play an important role in the forination of a fatigue spall. The crack gap and crack face friction coefficients significantly affect the formation of secondary surface cracks. Numerical calculation results are consistent with the experimental observations. A quantitative three-dimensional boundary element model has been developed, which can be used to determine the geometry of acceptable surfacering cracks.
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Queale, Abby J. "Additive effects on the hydrothermal degradation of hot-pressed silicon nitride spherical rolling elements." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0013338.

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Degutis, Aurimas. "Naujų riedėjimo guolių defektų diagnostiniai tyrimai." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2014. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2014~D_20140611_151233-28760.

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Šio tyrimo tikslas yra sukurti, realizuoti ir išbandyti metodą leidžiantį atlikti naujo riedėjimo guolio elementų neardoma diagnostiką ir įvertinti surinkimo kokybę. Norint įvertinti guolio kokybę jo neišardant, pasitelkti virpesių pagreičio signalo stebėsenos ir analizės metodai. Atlikti sekantys uždaviniai siekiant įgyvendinti tyrimo tikslą: • Apžvelgti pramonėje naudojami guolių kokybės įvertinimo metodai. • Sukurtas ir realizuotas metodas naujo guolio kokybei nustatyti. • Praktiškai patikrinta metodo teikiama nauda. • Išnagrinėta suteptų ir nesuteptų guolių įtaką kokybės nustatymui. Atliekant virpesių signalų tyrimą sukurtu ir realizuotu guolių elementų virpesių pagreičio vidutinės kvadratinės vertės metodu, galima nustatyti guolio surinkimo kokybę, jo elementų pažeidimus, neatliekant ardymo kas būna neišvengiama taikant kitus metodus. Metodo efektyvumas patvirtintas atliekant tiriamųjų guolių išsamius mechaninius tyrimus, kurių metu buvo išardyti tyrimuose naudoti riedėjimo guoliai ir nuodugniai ištirta jų riedėjimo elementų kokybė ir gauti rezultatai palyginti su realizuoto metodo teikiamais rezultatais. Realizuoti pagalbiniai metodai kaip virpesių pagreičio skirtumo radimas, vyraujančių dažnių paieška, kurie suteikia papildomos informacijos apie guolį ir/ar jo kokybę. Sukurtas ir realizuotas virpesių pagreičio signalo centravimo metodas, patikrinta jo teikiama praktinė nauda.
The purpose of this thesis is to create, implement and test a method which would allow to evaluate the quality of newly made bearing and its elements, without the need of disassembling the bearing. To evaluate the quality of the bearing without disassembling it, vibration signal monitoring and analysis methods were used. The following tasks were completed in order to accomplish the goal of the thesis: • Reviewed bearing quality evaluation and failure detection methods used in industry. • Created and implemented a method which could evaluate the quality of a bearing. • Experimentally tested the efficiency of the method. • Investigated the used oil influence on the quality detection. The quality of the bearing and its elements can be measured using bearing elements vibration acceleration root mean square method. This method does not require the disassembling of the bearing which might not be avoided when using other methods. The efficiency of the method was proven by performing extensive mechanical analysis on studied bearings, which required to disassemble the bearing and check in detail the quality of the bearing. The collected results were compared with the ones received from the implemented method. Some additional methods were created and implemented which would give more information about the bearing and its quality. The vibration acceleration signal centering method was implemented and its efficiency was checked experimentally.
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Stewart, William Elliott. "A Response Surface Exit Crown Model Built from the Finite Element Analysis of a Hot-Rolling Mill." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/45203.

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Nine independent and four dependent variables are used to build a response surface to calculate strip crown using the difference in the industry standard strip height measurements. The single element response surface in use provides the advantages of continuous derivatives and decouples rolling load from the determination of exit height. The data points to build the response surface are the product of a calibrated finite element model. The rolling dynamics in the finite element model creates a transient that requires nonlinear regression to find the system steady-state values. Weighted-least squares is used to build a response surface using isoparametric interpolation with the non-rectangular domain of the mill stands represented as a single element. The regression statistics, the 1-D projections, comparisons against other response surface models and the comparisons against an existing strip crown model are part the validation of the response surface generated. A four-high mill stand is modeled as a quarter-symmetry 3-D finite element model with an elastic-plastic material model. A comparison of the pressure distribution under the arc of contact with existing research supports the pressure distribution found with experiments conducted by Siebel and Lueg [16] and it also suggests the need for one improvement in the initial velocity for the strip in the finite element model. The strip exit heights show more sensitivity to change than strip exit crown in seven out of the nine independent variables, so a response surface built with the strip exit height is statistically superior to using the derived dependent variable strip exit crown. Sensitivity of strip exit crown and the strip exit heights to changes in work-roll crown are about equal. Backup-roll diameter sensitivity is small enough that oversampling for the mean trend has to be considered or ignore backup-roll altogether. Strip entry velocity is a new independent variable, unless the response surface is built from the derived variable, strip exit crown. A problem found is that the sensitivity of strip entry crown and work-roll crown requires a larger than typical incremental change to get a reliable measure of the change strip exit crown. A narrow choice of high and low strip entry crowns limits the usefulness of the final response surface. A recommendation is to consider the use of the strip cross-section as an exit crown predictor.
Master of Science
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Silva, Mario Luiz Nunes da. "Otimização do processo de laminação transversal com cunha para a produção de eixos com aço SAE 1045." [s.n.], 2008. http://repositorio.unicamp.br/jspui/handle/REPOSIP/264466.

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Orientador: Sergio Tonini Button
Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Mecanica
Made available in DSpace on 2018-08-11T13:27:48Z (GMT). No. of bitstreams: 1 Silva_MarioLuizNunesda_D.pdf: 5214131 bytes, checksum: d3b65bf8a08ad05e43b1a4cb009f56b7 (MD5) Previous issue date: 2008
Resumo: O processo Laminação Transversal com Cunha (conhecido em inglês como cross wedge rolling ou CWR) consiste na conformação plástica de produtos por meio de ferramentas em forma de cunhas fixadas em placas planas, côncavas ou convexas ou ainda em rolos de equipamentos de laminação. Apesar das vantagens desse processo associadas à elevada produtividade e minimização das perdas de matéria-prima, o surgimento do defeito interno denominado Mannesmann exige uma inspeção cuidadosa das peças produzidas. Esse defeito tem sua origem no centro das peças laminadas e suas causas ainda não estão totalmente identificadas. Baseando-se no método de elementos finitos, simulações numéricas em três dimensões do processo CWR foram estudadas utilizando-se o programa de simulação MSC Superform para analisar-se a influência das variáveis geométricas (ângulos de conformação e de estiramento e redução relativa) e de processo (temperatura de pré-aquecimento e velocidade de laminação) no aparecimento desse que é considerado o principal defeito do processo. Ensaios experimentais em equipamento existente no Laboratório de Conformação Mecânica da Faculdade de Engenharia Mecânica também foram realizados abrangendo as mesmas variáveis citadas para a simulação. Os dados obtidos nestes ensaios foram confrontados com os das simulações para se estudar as possíveis causas do defeito e também para se avaliar o grau de representatividade do processo pelo programa de simulação. Concluiu-se que sob o critério de análise da deformação máxima equivalente, à medida que se aumenta a redução relativa e diminuem-se o ângulo de conformação e a velocidade de processo aumenta-se a probabilidade de ocorrência dos defeitos internos. Tanto nas simulações como nos ensaios práticos, não se notou uma tendência definida para a variável temperatura com relação à sua influência na formação dos defeitos internos
Abstract: Cross-wedge rolling (CWR) is a metal forming process in which wedge shaped tools are assembled to rollers, and concave or convex plates. Despite the advantages of this process associated with high productivity and reduction of raw materials, the formation of an internal defect, called Mannesmann, requires a careful inspection of the rolled parts. This defect has its origin in the center of the rolled pieces and its causes are not yet fully identified. Based on the finite element method, numerical simulations of the CWR process in three dimensions were studied using the simulation software MSC Superform, in order to analyze the influence of some geometric (forming and stretching angles and relative reduction) and process (initial temperature and speed process) variables on the formation of this that is considered the main defect of the process. Tests were also performed in an experimental equipment available in the Mechanical Forming Laboratory of the School of Mechanical Engineering covering the same variables cited for the simulation. The data from these tests were confronted with simulation results to determine the possible causes of the defect and also to evaluate the agreement of these results. From the analysis of the maximum equivalent strain, the higher relative reduction and smaller forming angle and process speed values the higher probability that the internal defects occur. It was not noticed a good trend about the influence of the initial temperature on the formation of the internal defects
Doutorado
Materiais e Processos de Fabricação
Doutor em Engenharia Mecânica
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Cagaš, Radek. "Konstrukce dokončovacího stroje pro valivé elementy ložisek." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231787.

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The thesis deals with the design of the device that is used to improve the quality of the surface of spherical rollers. Spherical rollers are used for the measuring of the conditions in the EHD contact. The high roughness and waviness of the spherical rollers’ surface is a problem. Several machining methods are described in the theoretical part. The overview in theoretical part has been used for choice of the machining methods (lapping and abrasive polishing). The spherical rollers‘ machining system, its construction, electronics and control systems are described in the next section. The last part is focused on testing of assembled device, and on checking its functionality. The desired roughness of the spherical rollers' surface, suitable for successful interferometric measurement, was achieved by combining the selected machining methods. The roughness and waviness achieved was Ra0.01 micron Wa0.022 microns.
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CORSINI, BERTRAND CHRISTINE. "Modelisation numerique par elements finis du calibrage a chaud des metaux." Paris, ENMP, 1987. http://www.theses.fr/1987ENMP0073.

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Hamer, Clive. "Smearing in rolling element bearings." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/46801.

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Books on the topic "Rolling elements"

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Ying, Wang. Failure modes of silicon nitride rolling elements with ring crack defects. Poole: Bournemouth University, 2001.

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Kang, Jinsheng. Influences of surface quality on the rolling contact fatique behaviour of ceramics: An investigation into the relationship between the finishing process, surface quality and failure modes of advanced Si3N4 rolling elements. Poole: Bournemouth University, 2001.

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Karaszewski, Waldemar. Badanie wpływu wybranych czynników na rwałość ceramicznych elementów łożysk tocznych: Research on the effects of selected factors on the life of ceramic rolling bearing elements. Gdańsk: Wydawnictwo Politechniki Gdańskiej, 2013.

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Takeuchi, Yoshimi R., and William F. Mandler, eds. Rolling Element Bearings. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2012. http://dx.doi.org/10.1520/stp1542-eb.

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R, Takeuchi Yoshimi, and Mandler William F, eds. Rolling element bearings. West Conshohocken, PA: ASTM International, 2012.

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Changsen, Wan. Analysis of rolling element bearings. London: Mechanical Engineering Publications, 1991.

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Hu, Zhongmin. Finite element modelling of the ring-rolling process. Birmingham: University of Birmingham, 1995.

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Zaretsky, Erwin V. Comparison of life theories for rolling-element bearings. [Washington, D.C.]: National Aeronautics and Space Administration, 1995.

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Zaretsky, Erwin V. Effects of surface removal on rolling-element fatigue. [Washington, D.C.]: National Aeronautics and Space Administration, 1987.

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Wen, Shuwen. Elastic-plastic finite-element modelling of section rolling. Birmingham: University of Birmingham, 1994.

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Book chapters on the topic "Rolling elements"

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Stolarski, T. A., and S. Tobe. "Machine Elements in Rolling Contact." In Rolling Contacts, 239–315. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118903001.ch7.

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Stolarski, T. A., and S. Tobe. "Elements of Surface Contact of Solids." In Rolling Contacts, 11–54. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118903001.ch2.

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Danyluk, Michael, and Anoop Dhingra. "Rolling Contact Testing of Ball Bearing Elements." In Rolling Contact Fatigue in a Vacuum, 35–51. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-11930-4_3.

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Thomas, Jainy, and Ellen J. Pritham. "Helitrons, the Eukaryotic Rolling-circle Transposable Elements." In Mobile DNA III, 891–924. Washington, DC, USA: ASM Press, 2015. http://dx.doi.org/10.1128/9781555819217.ch40.

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Artiukh, Viktor, Vladlen Mazur, and Andrey Butyrin. "Analysis of Stress Conditions of Rolling Stand Elements." In International Scientific Conference Energy Management of Municipal Transportation Facilities and Transport EMMFT 2017, 212–19. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-70987-1_23.

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Cotogno, Michele, Marco Cocconcelli, and Riccardo Rubini. "Spatial Acceleration Modulus for Rolling Elements Bearing Diagnostics." In Lecture Notes in Mechanical Engineering, 587–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-39348-8_51.

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Horton, S. A. "Detection of Surface Defects in Ceramic Rolling Elements." In 4th International Symposium on Ceramic Materials and Components for Engines, 897–904. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2882-7_100.

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Cundill, R. T. "Material Selection and Quality for Ceramic Rolling Elements." In 4th International Symposium on Ceramic Materials and Components for Engines, 905–12. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2882-7_101.

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Ossola, E., S. Pagliassotto, S. Rizzo, and R. Sesana. "Microinclusion and Fatigue Performance of Bearing Rolling Elements." In Structural Integrity, 321–26. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-13980-3_41.

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Komata, Hiroki, Yasuhiro Iwanaga, Tohru Ueda, Koji Ueda, and Nobuaki Mitamura. "Enhanced Performance of Rolling Bearings by Improving the Resistance of Rolling Elements to Surface Degradation." In Bearing Steel Technologies: 10th Volume, Advances in Steel Technologies for Rolling Bearings, 1–19. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2014. http://dx.doi.org/10.1520/stp158020140085.

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Conference papers on the topic "Rolling elements"

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Gupta, Pradeep, and Pradeep Gupta. "Animated graphics of rolling elements." In 35th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1997. http://dx.doi.org/10.2514/6.1997-230.

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Zak, Pawel. "Ballbots rolling elements shape determination." In 2016 21st International Conference on Methods and Models in Automation and Robotics (MMAR). IEEE, 2016. http://dx.doi.org/10.1109/mmar.2016.7575299.

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Barakat, M., D. Lefebvre, M. Khalil, O. Mustapha, and F. Druaux. "BSP-BDT classification technique: Application to rolling elements bearing." In 2010 Conference on Control and Fault-Tolerant Systems (SysTol). IEEE, 2010. http://dx.doi.org/10.1109/systol.2010.5676054.

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Tatarintsev, V. A., and A. K. Tolstosheev. "Risk assessment and reliability of railway rolling stock elements." In PROCEEDINGS INTERNATIONAL CONFERENCE “PROBLEMS OF APPLIED MECHANICS”. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0047254.

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Ahmed, R., M. Hadfield, and S. Tobe. "Residual Stress Analysis in Thermal Spray Coated Rolling Elements." In ITSC 1996, edited by C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0875.

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Abstract The full potential of rolling element bearings operating in specialised conditions such as high speed and corrosive environments are realised using surface coatings. Tungsten Carbide coating by thermal spray HVOF and D-Gim processes are considered for these applications. An experimental approach using a modified four-ball machine simulates the tribological conditions within a rolling element bearing. The fatigue failure modes of the tungsten carbide coating in rolling contact with steel and silicon nitride are examined using conventional surface analysis techniques. The stress fields within the coating are examined using traditional contact theory and residual stress measurement by X-ray diffraction. The residual stress measurements of the pre-test coating, the contacting surface and the fatigue failures are described. Results of residual stress relating to orientation, failure depth, coating thickness are discussed along with the fatigue failure mode.
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Tatarincev, Vyacheslav, and Andrey Tolstosheev. "RISK ASSESSMENT AND ENSURING THE RELIABILITY OF ROLLING STORAGE ELEMENTS." In PROBLEMS OF APPLIED MECHANICS. Bryansk State Technical University, 2020. http://dx.doi.org/10.30987/conferencearticle_5fd1ed03697626.38853364.

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The paper considers an approach to predicting the risks of emergencies in transport and improving its safety. It is shown that the prediction of risks in railway transport is determined by the processes of deformation and destruction at hazardous points of highly loaded zones of critical elements of transport objects. Management of the processes of degradation of transport facilities through the use of diagnostic systems and renovation technologies at all stages of the life cycle ensures an increase in its safety and protection from emergency situations.
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7

Halverson, Peter A., Larry L. Howell, Brian D. Jensen, and Spencer P. Magleby. "Concepts for Achieving Multi-Stability in Compliant Rolling-Contact Elements." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34836.

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This paper describes the design of a novel multi-stable compliant mechanism capable of large angle deflections. The multi-stable COmpliant Rolling-contact Element (CORE), reduces friction, allows for large angular displacements, and requires no external force to remain in its multiple equilibrium positions. This paper develops and discusses seven methods to create multi-stable mechanisms from the CORE. These seven methods have different characteristics and advantages.
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8

De Los Santos, Nancy, Constantine M. Tarawneh, Robert E. Jones, and Arturo Fuentes. "Defect Prognostics Models for Spall Growth in Railroad Bearing Rolling Elements." In 2018 Joint Rail Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/jrc2018-6214.

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Prevention of railroad bearing failures, which may lead to catastrophic derailments, is a central safety concern. Early detection of railway component defects, specifically bearing spalls, will improve overall system reliability by allowing proactive maintenance cycles rather than costly reactive replacement of failing components. A bearing health monitoring system will provide timely detection of flaws. However, absent a well verified model for defect propagation, detection can only be used to trigger an immediate component replacement. The development of such a model requires that the spall growth process be mapped out by accumulating associated signals generated by various size spalls. The addition of this information to an integrated health monitoring system will minimize operation disruption and maintain maximum accident prevention standards enabling timely and economical replacements of failing components. An earlier study done by the authors focused on bearing outer ring (cup) raceway defects. The developed model predicts that any cup raceway surface defect (i.e. spall) once reaching a critical size (spall area) will grow according to a linear correlation with mileage. The work presented here investigates spall growth within the inner rings (cones) of railroad bearings as a function of mileage. The data for this study were acquired from defective bearings that were run under various load and speed conditions utilizing specialized railroad bearing dynamic test rigs owned by the University Transportation Center for Railway Safety (UTCRS) at the University of Texas Rio Grande Valley (UTRGV). The experimental process is based on a testing cycle that allows continuous growth of railroad bearing defects until one of two conditions are met; either the defect is allowed to grow to a size that does not jeopardize the safe operation of the test rig, or the change in area of the spall is less than 10% of its previous size prior to the start of testing. The initial spall size is randomly distributed as it depends on the originating defect depth, size, and location on the rolling raceway. Periodic removal and disassembly of the railroad bearings was carried out for inspection and defect size measurement along with detailed documentation. Spalls were measured using optical techniques coupled with digital image analysis, as well as, with a manual coordinate measuring instrument with the resulting field of points manipulated in MatLab™. Castings were made of spalls using low-melting, zero-shrinkage bismuth-based alloys, so that a permanent record of the spall geometry and its growth history can be retained. The main result of this study is a preliminary model for spall growth, which can be coupled with bearing condition monitoring tools that will allow economical and effective scheduling of proactive maintenance cycles that aim to mitigate derailments, and reduce unnecessary train stoppages and associated costly delays on busy railways.
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9

Feng, N. S., and E. J. Hahn. "Rolling Element Bearing Non-Linearity Effects." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0391.

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Non-linearity effects in rolling element bearings arise from two sources, viz. the Hertzian force deformation relationship and the presence of clearance between the rolling elements and the bearing races. Assuming that centrifugal effects may be neglected and that the presence of axial preload is appropriately reflected in a corresponding change in the radial clearance, this paper analyses a simple test rig to illustrate that non-linear phenomena such as synchronous multistable and nonsynchronous motions are possible in simple rigid and flexible rotor systems subjected to unbalance excitation. The equations of motion of the rotor bearing system were solved by transient analysis using fourth order Runge Kutta. Of particular interest is the effect of clearance, governed in practice by bearing specification and the amount of preload, on the vibration behaviour of rotors supported by ball bearings and on the bearing load. It is shown that in the presence of positive clearance, there exists an unbalance excitation range during which the bearing is momentarily not transmitting force owing to contact loss, resulting in rolling element raceway impact with potentially relatively high bearing forces; and indicating that for long bearing life, operation with positive clearance should be avoided in the presence of such unbalance loading. Once the unbalance excitation is high enough to avoid such contact loss, it is the bearings with zero or negative clearance which produce maximum bearing forces.
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10

Scott, Dan E., and Marc R. Skeem. "Diamond Enhanced Shear Cutting Elements on Roller Cone Bits." In ASME 2001 Engineering Technology Conference on Energy. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/etce2001-17031.

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Abstract Polycrystalline diamond (PCD) cutters and drag bit designs have been substantially improved since their 1972 introduction, and PCD drill bits now are approaching the rolling cone tungsten carbide insert (TCI) market is terms of revenue size and have surpassed it in terms of economic impact on the drilling industry.1,2 These performance improvements have lead to a significant encroachment into the drill bit market built upon the breakthrough invention of the rolling cone bit by Howard Hughes Sr. Material and design improvements in the last decade, however, have now led to the successful application of patented shear cutting PCD elements as well as conventional diamond enhanced crushing style inserts on rolling cone bits. Diamond enhanced rolling cone bits are also a growth market for diamond elements in drilling. Failing rock in shear is a more efficient process than by crushing, but most cutting materials can not stand up to the forces generated in the shearing process as rock strength increases. To take advantage of the unique ability of the PCD cutter to shear rock efficiently, a concerted R&D effort supported by laboratory and field-testing led to the application of diamond as a shear cutting element on roller cone bits. A variety of rolling cone shear cutting elements have been developed and successfully commercialized in the last decade. This paper will discuss laboratory results and increased field performance achieved relative to conventional crushing style diamond and tungsten carbide inserts. The authors will document through case studies increases in rate of penetration (ROP), footage, overall durability, and gauge holding ability in addition to bearing/seal effectiveness that have further reduced drilling costs and served to increase usage of polycrystalline diamond elements on roller cone bits. These applications range from such diverse markets as high cost offshore North Sea, to low cost North American land operations.
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Reports on the topic "Rolling elements"

1

Katz, R. N. Ceramic Materials for Rolling Element Bearing Applications,. Fort Belvoir, VA: Defense Technical Information Center, May 1995. http://dx.doi.org/10.21236/ada297304.

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2

Soulami, Ayoub, Curt A. Lavender, Dean M. Paxton, and Douglas Burkes. Rolling Process Modeling Report: Finite-Element Prediction of Roll Separating Force and Rolling Defects. Office of Scientific and Technical Information (OSTI), April 2014. http://dx.doi.org/10.2172/1177322.

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3

Soulami, Ayoub, Curt A. Lavender, Dean M. Paxton, and Douglas Burkes. Rolling Process Modeling Report. Finite-Element Model Validation and Parametric Study on various Rolling Process parameters. Office of Scientific and Technical Information (OSTI), June 2015. http://dx.doi.org/10.2172/1194303.

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4

Davies, M. A., D. E. Boyce, and P. R. Dawson. Three-dimensional finite element simulations of the rolling of superconducting wire. Office of Scientific and Technical Information (OSTI), November 1993. http://dx.doi.org/10.2172/426995.

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5

Tordesillas, Antoinette. A Large Deformation Finite Element Analysis of Soil-Tire Interaction Based on the Contact Mechanics Theory of Rolling and/or Sliding Bodies. Fort Belvoir, VA: Defense Technical Information Center, June 2000. http://dx.doi.org/10.21236/ada384198.

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