Gotowe bibliografie tematyczne / Bearing characteristics

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Gotowa bibliografia na temat „Bearing characteristics”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 18 lutego 2022

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Artykuły w czasopismach na temat "Bearing characteristics"

Yang, Jian Xi, Fa Yu Zhang, Jian Ting Liu i Jian Fang Zhou. "Load-Carrying Capacity Analysis for Sinusoidal Surfaces Hydrodynamic Bearing". Advanced Materials Research 295-297 (lipiec 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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Chen-Hui, Jia, Du Cai-Feng i Qiu Ming. "Research on Nonlinear Dynamic Characteristics and Stability of Aerodynamic Bearings". Open Mechanical Engineering Journal 8, nr 1 (16.09.2014): 243–50. http://dx.doi.org/10.2174/1874155x01408010243.

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In order to research the conical spiral groove aerodynamic bearings, the lubrication mathematical model of the bearings was established. The Reynolds equation of the laminar flow condition is used to calculate the partial differential equation of the perturbation pressure with the local finite difference method. Through calculating the stiffness and damping coefficient, the influence of the speed of law and eccentricity ratio on the dynamic characteristic coefficients has been gained. The mathematical model for the stability of the bearing-rotor system is established to study the influence law of speed influence of the law of speed and eccentricity ratio on the stability. The results show that the influence of the bearing's speed and eccentricity on the dynamic characteristics is significant. A reasonable choice of the bearing's speed and eccentricity contributes to improve the dynamic characteristics and the stability of the bearing-rotor system.

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Lin, Xi Chen, Rui Ping Zhou i Neng Qi Xiao. "Influence Characteristics of Fluid Film Bearing’s Displacement-Load on Rotating Vibration of Rotor System". Applied Mechanics and Materials 727-728 (styczeń 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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Wang, You Qiang, i Li Jing Zhang. "Characteristics and Outline of Water-Lubricated Thordon Bearing". Advanced Materials Research 496 (marzec 2012): 355–58. http://dx.doi.org/10.4028/www.scientific.net/amr.496.355.

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Thordon is a new liner material used widely in water-lubricated bearings in virtue of its shockproof characteristic, high load and wear resistance. The category of materials used in water-lubricated bearings was briefly outlined and tribological characteristics of most of the materials were compared in the paper. The defects of the traditional water-lubricated bearing materials were listed and the advantage of the Thordon bearing was presented. The development status and the tribological characteristics of the water-lubricated Thordon bearings were studied. The application prospects of the water-lubricated Thordon bearings were introduced in the end of the paper.

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Gao, Hang, Qing Lv i Li Gang Qu. "Influence of Groove Slotting for Micro-Sensor Embedding on Smart Bearing's Mechanical Characteristics". Key Engineering Materials 297-300 (listopad 2005): 562–66. http://dx.doi.org/10.4028/www.scientific.net/kem.297-300.562.

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It is necessary to slot a groove on the outside of the bearing’s raceway in order to embed micro-sensor for smart bearing. Reasonable choice of slotting parameters for different type of bearings is one of key problems to be solved in smart bearing design. In this paper three-dimensional solid model and corresponding mechanics model for a segment of ball bearing’s out ring are built according to some reasonable simplification and supposition of boundary condition and loading status. Further more the influence of slotting parameters on smart bearing’s mechanical characteristics is studied with FEA method. Choosing 220 type of ball bearing as an example, theoretical analysis results of influence of slotting parameters on the maximum stress and deformation of outer ring are shown. The FEA results showed that micro-sensors for smart bearings should be manufactured flatter or the groove depth for micro-sensor embedding should be smaller soon as possible in order to insure the smart bearing’s original mechanical rigidity and strength.

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Lu, Chen, Qian Sun, Laifa Tao, Hongmei Liu i Chuan Lu. "Bearing Health Assessment Based on Chaotic Characteristics". Shock and Vibration 20, nr 3 (2013): 519–30. http://dx.doi.org/10.1155/2013/645308.

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Vibration signals extracted from rotating parts of machinery carry a lot of useful information about the condition of operating machine. Due to the strong non-linear, complex and non-stationary characteristics of vibration signals from working bearings, an accurate and reliable health assessment method for bearing is necessary. This paper proposes to utilize the selected chaotic characteristics of vibration signal for health assessment of a bearing by using self-organizing map (SOM). Both Grassberger-Procaccia algorithm and Takens' theory are employed to calculate the characteristic vector which includes three chaotic characteristics, such as correlation dimension, largest Lyapunov exponent and Kolmogorov entropy. After that, SOM is used to map the three corresponding characteristics into a confidence value (CV) which represents the health state of the bearing. Finally, a case study based on vibration datasets of a group of testing bearings was conducted to demonstrate that the proposed method can reliably assess the health state of bearing.

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Ngo, Thi-Thao, Van-The Than, Chi-Chang Wang i Jin H. Huang. "Analyzing characteristics of high-speed spindle bearing under constant preload". Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 232, nr 5 (1.08.2017): 568–81. http://dx.doi.org/10.1177/1350650117723484.

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Bearings play an important role in a high-speed spindle. Its characteristics are often influenced by speed and thermal effects. This paper presents an approach that combines an inverse method with a high-speed ball bearing model to determine the characteristics of a high-speed spindle bearing under constant preload in actual working conditions. With temperature distribution in the entire spindle obtained by the experimental inverse heat transfer model from the authors’ previous results, the change in bearing parameters is then calculated and subsequently replaced in the bearing model to analyze the change in bearing characteristics. As a result, thermal effects on a bearing’s dynamic contact angles, contact forces, contact stress, stiffness, and lubricant film thickness are presented. Moreover, analysis results indicate that a bearing’s stiffness and lubricant film thickness nonlinearly vary with the increase in speed, and the thermal effect significantly affects the lubricant film thickness. The results presented herein may be applied to develop a dynamic model for a high-speed spindle using a constant preload and provide useful information to avoid failure in lubrication.

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Feng, N. S., i E. J. Hahn. "Vibration Characteristics of Hydrodynamic Fluid Film Pocket Journal Bearings". Advances in Acoustics and Vibration 2010 (27.12.2010): 1–10. http://dx.doi.org/10.1155/2010/589318.

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Theoretical analyses of hydrodynamic fluid film bearings with different bearing profiles rely on solutions of the Reynolds equation. This paper presents an approach used for analysing the so-called pocket bearings formed from a combination of offset circular bearing profiles. The results show that the variation of the dynamic bearing characteristics with different load inclinations for the pocket bearings is less than that for the elliptic bearing counterpart. It is shown that the natural frequencies as well as the critical speeds, and hence the vibrational behaviour, can also be significantly different for an industrial rotor supported by the different bearings.

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Zheng, Yueqing, Tianwei Lai, Shuangtao Chen, Liang Chen, Liqiang Liu i 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, nr 2 (5.08.2016): 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 depends on both the load force and the configuration of the bearings. In the airborne regime, the torque of the bearing is mainly dependent on the load force rather than the rotational speed, which can be interpreted by the proportional relationship between the bearing clearance and the rotational speed. Furthermore, the experimental results also show that the maximum load capacities of the bearing are also greatly affected by the bearing configuration. With more layers of the protuberant foils and thinner top foil, the bearing shows larger maximum load capacity. The work provides some insights about the relationships between the characteristics and the configuration of the bearings.

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Keller, Jonathan, Yi Guo, Zhiwei Zhang i Doug Lucas. "Comparison of planetary bearing load-sharing characteristics in wind turbine gearboxes". Wind Energy Science 3, nr 2 (21.12.2018): 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 cylindrical roller bearings supporting the planets even in pure torque conditions, with one bearing supporting up to 46 % more load than expected. A significant improvement in planetary bearing load sharing was demonstrated in the gearbox with preloaded tapered roller bearings with maximum loads 20 % lower than the gearbox with cylindrical roller bearings. Bearing life was calculated with a representative duty cycle measured from field tests. The predicted fatigue life of the eight combined planet and carrier bearings for the gearbox with preloaded tapered roller bearings is 3.5 times greater than for the gearbox with cylindrical roller bearings. The influence of other factors, such as carrier and planet bearing clearance, gravity, and tangential pin position error, is also investigated. The combined effect of gravity and carrier bearing clearance was primarily responsible for unequal load sharing. Reducing carrier bearing clearance significantly improved load sharing, while reducing planet clearance did not. Normal tangential pin position error did not impact load sharing due to the floating sun design of this three-planet gearbox.

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Rozprawy doktorskie na temat "Bearing characteristics"

Al, Jughaiman Bader K. "Static and dynamic characteristics for a two-axial-groove bearing and a pressure-dam bearing". [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1816.

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Gunduz, Aydin. "Multi-Dimensional Stiffness Characteristics of Double Row Angular Contact Ball Bearings and Their Role in Influencing Vibration Modes". The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1326397623.

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Swanson, Erik Evan. "Design and Evaluation of an Automated Experimental Test Rig for Determination of the Dynamic Characteristics of Fluid-Film Bearings". Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30727.

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Hydrodynamic journal bearings are applied in a wide range of both old and new, advanced rotating machinery designs. To maintain existing machinery, as well as to design new, state of the art machines, validated analytical models for these bearings are needed. This work documents the development and evaluation of an automated test rig for the evaluation of hydrodynamic journal bearings to provide some of the needed experimental data. This work describes the test rig in detail, including the results of experimental characterization of many of the test rig subsystems. Experimental data for a two axial groove bearing and a pressure dam bearing under steady load conditions are presented for a range of loads at two different shaft speeds. Experimental data and analytical results for dynamic loading are also discussed. The work concludes with a summary of the state of the test rig and recommendations for further work.
Ph. D.

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Skjæret, Nina. "Weight-bearing characteristics during standing in adults with Cerebral Palsy". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for bevegelsesvitenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13165.

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Aim: The aim of this study was to investigate weight-bearing characteristics in young adults with CP compared to young healthy adults in both quiet and relaxed standing. Methods: Two standing conditions were tested, one minute quiet standing (QS) and one minute relaxed standing (RS) in both groups. Data were collected with two Kistler force plates and a video camera. Weight-bearing asymmetries, shifts in weight bearing and CoP movements under each foot were calculated in Matlab, and PSAW Statistics was used for statistical analysis. Results: There were large individual differences in weight bearing characteristics between feet in both CP participants and control participants. In the QS condition, the CP group had equal weight on both feet in average across the trial, a trend towards a higher asymmetrical weight bearing index (p=.08), and larger movements of CoP under each foot than the control participants. In the RS condition, the CP group had no difference in weight bearing between the feet, more shifts in weight bearing in the form of steps, and less asymmetrical weight bearing index than the control group. Also, the CP participants had more CoP movements on their non-affected side than the controls had on their dominant side, and less CoP movements on their affected side than the controls had on their non-dominant side. Conclusion: CP participants have several different strategies for maintaining upright standing posture, varying from largely relying on their non-affected side for weight support, to standing almost symmetrical, to supporting more weight on their affected leg. Even though CP participants have more asymmetrical weight bearing in quiet standing compared to controls, this is not the case in relaxed standing where controls are more asymmetrical. This study provides more insight into relaxed standing and the strategies CP patients use to maintain an upright standing posture. Future studies should investigate the prevalence of postural asymmetry in a larger sample of patients, for a longer period of time, and how possible findings can be used in treatment of this patient group. Key words: Cerebral palsy, quiet standing, relaxed standing, weight-bearing asymmetries, shifts in weight-bearing, center of pressure.

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Guo, Jenq-Shan. "Characteristics of the nonlinear hysteresis loop for rotor-bearing instability". Case Western Reserve University School of Graduate Studies / OhioLINK, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1062688989.

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Kucuk, N. C. "Modelling and identification of dynamic characteristics of a squeeze-film bearing". Thesis, University of Strathclyde, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382252.

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Jones, Andrew Christopher. "An investigation of the performance characteristics of isothermal calorimeters". Thesis, Imperial College London, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.264979.

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Erdemir, Ali. "A study of surface metallurgical characteristics of tin coated bearing steels". Diss., Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/20134.

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Ha, Duc Nhin. "The floating and dynamic characteristics of a squeeze-film air bearing". Thesis, Brunel University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422456.

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Sianaki, A. H. "Parametric identification of squeeze-film bearing characteristics : a continuous time approach". Thesis, University of Edinburgh, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.661888.

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Książki na temat "Bearing characteristics"

Morton, Robert A. Depositional history, facies analysis, and production characteristics of hydrocarbon-bearing sediments, offshore Texas. Austin, Tex: Bureau of Economic Geology, University of Texas at Austin, 1985.

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Molenaar, Dee. The Spokane aquifer, Washington: Its geologic origin and water-bearing and water-quality characteristics. [Washington]: U.S. G.P.O., 1988.

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Harlow, George E. Hydraulic characteristics of, and ground-water flow in, coal-bearing rocks of southwestern Virginia. Washington, D.C: U.S. G.P.O., 1993.

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Molenaar, Dee. The Spokane aquifer, Washington: Its geologic origin and water-bearing and water-quality characteristics. Washington, DC: Dept. of the Interior, 1988.

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Bradfield, Arthur D. Benthic invertebrate population characteristics as affected by water quality in coal-bearing regions of Tennessee. Nashville, Tenn: U.S. Dept. of the Interior, Geological Survey, 1986.

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Krzyczkowska-Everest, Anna. Petrographic characteristics of the ore-bearing dolomites of the Górażdża beds, from Olkusz-Bolesław region (South Poland). Wrocław: Zakład Narodowy im. Ossolińskich, 1990.

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Schuller, Fredrick T. Effect of two inner-ring oil-flow distribution schemes on the operating characteristics of a 35-millimeter-bore ball bearing to 2.5 million DN. Washington, D.C: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1985.

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Części książek na temat "Bearing characteristics"

Rees, Paul A. "Seed-bearing plants." W Key questions in biodiversity: a study and revision guide, 66–86. Wallingford: CABI, 2021. http://dx.doi.org/10.1079/9781789248630.0005.

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Abstract This chapter contains questions about the classification, evolution and characteristics of seed-bearing plants (angiosperms and gymnosperms). The questions are divided into three levels: foundation, intermediate and advanced.

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Lee, Seon Ho, i Hee Jae Kang. "Austempering Effects on the Rolling Contact Fatigue Characteristics of Bearing Steels". W Bearing Steel Technologies: 10th Volume, Advances in Steel Technologies for Rolling Bearings, 1–23. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2014. http://dx.doi.org/10.1520/stp158020140072.

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Trivedi, Hitesh K., DaMari A. Haywood, Mathew S. Kirsch i Lewis Rosado. "Spall Propagation Characteristics of As-Manufactured Aerospace Bearing Steels". W Bearing Steel Technologies: 12th Volume, Progress in Bearing Steel Metallurgical Testing and Quality Assurance, 551–73. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2020. http://dx.doi.org/10.1520/stp162320190089.

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Greenwald, A. S. "Stability Characteristics of the Tibial-Femoral and Patellar-Femoral Articulations". W LCS® Mobile Bearing Knee Arthroplasty, 53–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-642-59347-5_7.

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Yin, Zhaoqin, i Dongsheng Li. "Numerical Study on Mechanical Characteristics of Aerostatic Bearing". W Fluid Machinery and Fluid Mechanics, 411–14. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89749-1_66.

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Bera, Madhab, Pragya Gupta i Pradip K. Maji. "Structural/Load-Bearing Characteristics of Polymer–Carbon Composites". W Springer Series on Polymer and Composite Materials, 457–502. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2688-2_13.

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Rao, T. V. V. L. N., Ahmad Majdi Abdul Rani i Geetha Manivasagam. "Squeeze Film Bearing Characteristics for Synovial Joint Applications". W Biomaterials in Orthopaedics and Bone Regeneration, 55–72. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-9977-0_5.

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Trivedi, Hitesh K., DaMari A. Haywood, Lewis Rosado i Mathew S. Kirsch. "Spall Propagation Characteristics of Life-Tested VIM-VAR M50 and Pyrowear 675 Bearing Steels". W Bearing Steel Technologies: 12th Volume, Progress in Bearing Steel Metallurgical Testing and Quality Assurance, 528–50. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2020. http://dx.doi.org/10.1520/stp162320190102.

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Dang, Phuoc Vinh, Steven Chatterton i Paolo Pennacchi. "Dynamic Characteristics of a Non-symmetric Tilting Pad Journal Bearing". W Lecture Notes in Electrical Engineering, 658–69. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-14907-9_64.

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Chatterton, Steven, Paolo Pennacchi, Phuoc Vinh Dang i Andrea Vania. "A Test Rig for Evaluating Tilting-Pad Journal Bearing Characteristics". W Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 921–30. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_75.

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Streszczenia konferencji na temat "Bearing characteristics"

Lee, Yong Bok, Kyung Min Lee, Jin-Taek Chung, Seung Jong Kim i Se Na Jeong. "Dynamic Characteristics of the Combined Smart Bearing". W ASME/STLE 2011 International Joint Tribology Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ijtc2011-61179.

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The stability, reliability, efficient performance of high speed turbo machinery is very important, and accordingly has increased the demand for advanced bearings. In order to meet the advanced bearing needs, Heshmat proposed a hybrid foil-magnetic bearing [1]. The hybrid bearing combining the two bearings takes advantage of the strengths of each while compensating for each other’s weaknesses. This paper presents dynamic characteristics of the combined smart bearing (CSB) of different structure from Heshmat’s bearing. The CSB and test rig were designed, fabricated and carried out the test. Numerical predictions of Air foil bearing (AFB) and CSB were compared the dynamic force performance, and analysis of bearings are performed by finite element method (FEM). Experiments were conducted to determine the structural static and dynamic characteristics of AFB. The dynamic characteristics of AFB and CSB compared depending on the rotating speed change. The experimental results were obtained the dynamic characteristics of the CSB 50% higher than value of the stiffness effect. In addition to, the CSB 100% higher than value of the damping effect.

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Karloff, J. A., W. N. Weins i R. C. Arnold. "Vibrational Characteristics of Tapered Roller Bearing Cages". W ASME 2000 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/detc2000/rsafp-14480.

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Abstract One of the important components of a tapered roller bearing is the cage. The main function of the cage during operation is to maintain roller spacing. Although being one of the more complicated parts of a tapered roller bearing, historically, very little specific engineering has been published to provide a design basis for the tapered roller bearing cage. This work analyzed specifically, the cages from tapered roller bearings as used in the railway industry. As the load carrying requirements for railcars have increased, the size of bearing has also increased. Although cage dimensions have increased with bearing size, little specific engineering has been published to document the effect the change in size has on the durability of the larger cages. Testing was conducted to determine the amount of stress induced on the cage due to the vibration environment of a tapered roller bearing used in rail service. Cages evaluated were steel cages from 6 ½ × 12 and 7 × 12 tapered roller bearings and a plastic cage from a 6 ½ × 12 bearing. The natural frequencies of the cages were determined and then compared to the exciting frequencies of the bearings. Vibrations, internal and external to the bearing were measured at various simulated train speeds. The magnitude and frequencies of these excitation vibrations were input into the finite element modeling software, ALGOR®, to find the response of the cage. It was found that the stresses generated in the small end cage pocket of larger 7 × 12 steel cages were as much as twice that of the 6 ½ × 12 steel cages. The stress generated at the pocket of the 6 ½ × 12 plastic cage was smaller than the 6 ½ × 12 steel cage.

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Zhou, Caihui, An Chen i Jian Meng. "Multiple Compound Foundation Bearing Characteristics". W 2018 7th International Conference on Energy, Environment and Sustainable Development (ICEESD 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/iceesd-18.2018.260.

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Hong, Jun, Guanghui Liu, Xiaohu Li, Wenwu Wu, Shaoke Wan, Shaohang Ma i Dongfeng Wang. "Influence of Bearing Configuration on Spindle Modal Characteristics". W ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37430.

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Since bearing configuration has significant influence on the spindle modal characteristics which can reflect the dynamic performance of spindle system in machine tools, so it would be of extraordinary importance and necessity to analyze the spindle modal characteristics through simulation and experiment when it comes to designing spindle system. In this paper, the number and span of bearings, the spacer of bearing set and the overhang of spindle are considered as the main designing parameters of the spindle system. Firstly, a coupled spindle-bearing model is established considering the radial deformation of the bearing inner ring caused by interference fits of spindle assembly, as well as the centrifugal and thermal deformations. Based on the model, the modal characteristics of different bearing configurations are analyzed. Secondly, a spindle test bench is designed and constructed. Finally, modal characteristics of the spindle system are tested with different bearing configurations. From the simulation and experimental results, it’s indicated that there is a correlation between the natural frequency and the number of bearings. The using of short spacer inside the bearing set can increase spindle natural frequency slightly. Besides, the first natural frequency of the spindle system rises with the bearing span, whereas the second one tends to decrease. And shortening the overhang of spindle can also increase its natural frequencies, which can be taken into account in spindle design.

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Clampitt, Bert H. "Effect of Bearing Surface Characteristics on Bearing Oil Film Thickness". W 1989 SAE International Fall Fuels and Lubricants Meeting and Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1989. http://dx.doi.org/10.4271/892153.

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Voznyakovskii, А., Y. Auchynnikau, V. Liopo i Y. Eisymont. "TRIBOTECHNICAL CHARACTERISTICS OF CARBON-BEARING LUBRICANTS". W BALTTRIB. Aleksandras Stulginskis University, 2017. http://dx.doi.org/10.15544/balttrib.2017.15.

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The development of technology for manufacturing nanostructured substances in amounts that could suffice an interlaboratory research is a high priority task for the implementation of nanoproducts. The ultra dispersiblis clusters of synthetic carbon are used as on extra component in polymeric materials. The substances have a high dispersibility and activity of the surface. To study properties of mineral oils, modified ultra dispersiblis clusters of synthetic carbon is of interest. The present activity is devoted to the research of the modifying influence of ultra dispersiblis clusters of synthetic carbon on viscosity of the characteristic of mineral oils and their stability at various temperatures. In the preparation of diamond secondary suspensions not only statistic average sizes of particles should be taken into consideration, but also polydispersity parameters of nanodiamond particle population too.

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Seong, Sulki, Wangoo Kim, Daesung Bae, Seungpyo Lee, Younggeol Cho i Kyeongdeok Yang. "A Bearing Endurance Life Prediction Method Considering the Bearing Dynamic Characteristics". W 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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Cade, Iain S., Patrick S. Keogh, M. Necip Sahinkaya i Clifford R. Burrows. "Wavelet Coefficient Characteristics During Rotor/Auxiliary Bearing Contact in Active Magnetic Bearing Systems". W ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35362.

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Auxiliary bearings are present in active magnetic bearing systems to prevent rotor/stator contact. If rotor/bearing contact occurs, significant impact forces may arise. Furthermore, linear control strategies may become ineffective due to the non-linear dynamics introduced by the auxiliary bearing. Rotor/auxiliary bearing contact is therefore an important consideration for the continued safe operation of an active magnetic bearing system. This work utilizes the localized nature of wavelets coefficients in characterising rotor/bearing contact responses. An experimental approach is adopted using a flexible rotor/active magnetic bearing test rig. Different disturbances resulting in periodic rotor contact and rotor/bearing rub were applied using a single active magnetic bearing. Rotor displacements were measured and the radial component and associated wavelet coefficients identified from off-line data processing. Variations of the wavelet coefficients characteristics corresponding to the periodic contact and rotor/bearing rub are assessed. The choice of mother wavelet is seen to have only a small effect on wavelet coefficient values. Wavelet analysis is shown as a feasible method for identifying time-frequency characteristics of rotor/bearing contact.

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Rudloff, Laurent, Mihai Arghir, Olivier Bonneau, Sebastien Guingo, Guillaume Chemla i Emelyne Renard. "Experimental Analysis of Dynamic Characteristics of a Hybrid Aerostatic Bearing". W ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-46048.

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The dynamic characteristics of a hybrid aerostatic bearing are experimentally investigated on a test rig consisting of a rigid rotor driven by an impulse turbine located at its midlength. The rotor is horizontally mounted and is supported by two identical aerostatic bearings at its ends. Both the impulse turbine and the aerostatic hybrid bearings are fed with air. The actually available resources enable to attain feeding pressures up to 5 bar in the bearings and rotation speeds up to 60 krpm. Under these conditions the dynamic load on the rotor is much larger than the static load engendered by its weight. Dynamic loads consist either of impacts provided by a hammer or of added unbalance masses. The test rig can measure the bearing feeding pressures, the rotation speed, the impact force, the displacements of the two bearings and the bearing housing accelerations. This experimental information together with the equations of motion of the rotor enables the identification of the dynamic coefficients of the bearings. A second identification procedure using the same impact hammer is enabled by the fact force transducers are mounted between the bearing housing and its support. The dynamic coefficients of the bearings can then be obtained from the equation of motion of its housing. Unbalance response provide a convenient way for verifying the accuracy of the identified dynamic coefficients. Therefore these coefficients are injected in the equations of motion of a four degrees of freedom rigid rotor and the theoretical results are compared with values measured on the test rig. Comparisons show that predictions are acceptable but become less accurate at high rotation speeds where large dynamic forces are needed for exciting the corresponding synchronous frequencies.

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Hokao, Michita, i Atsushi Yokouchi. "Lubricating Characteristics of Fluorine Grease Containing Silica Nanoparticles". W STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71088.

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Electrical motor bearings for use in automotive control units are sometimes exposed to high-temperature operating conditions. Therefore, these bearings are sometimes packed with fluorine grease in order to meet the demand for long service life performance. In recent years, there is growing demand for lower initial torque in these same bearings without sacrificing service life performance. This paper describes the effects of fluorine grease containing silica nanoparticles on initial bearing torque of electrical motor bearings. Silica nanoparticles are effective in helping to reduce amounts of initial bearing torque and help stabilize bearing torque due to improved channeling characteristics.

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Raporty organizacyjne na temat "Bearing characteristics"

Katsube, T. J., S. R. Dallimore, I. R. Jonasson, S. Connell-Madore, B. E. Medioli, T. Uchida, J F Wright i N. Scromeda. Petrophysical characteristics of gas-hydrate-bearing and gas-hydrate-free formations in the JAPEX/JNOC/GSC et al. Mallik 5L-38 gas hydrate production research well. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2005. http://dx.doi.org/10.4095/220729.

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Bauer, Reinhold, i Paul D. Fleischauer. Torque Characteristics of Solid Lubricated Precision Bearings during Oscillatory Motion. Fort Belvoir, VA: Defense Technical Information Center, styczeń 1994. http://dx.doi.org/10.21236/ada278133.

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Chang, Y. W., i R. W. Seidensticker. Dynamic characteristics of Bridgestone low shear modulus-high damping seismic isolation bearings. Office of Scientific and Technical Information (OSTI), czerwiec 1993. http://dx.doi.org/10.2172/10181217.

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Venäläinen, Ari, Sanna Luhtala, Mikko Laapas, Otto Hyvärinen, Hilppa Gregow, Mikko Strahlendorff, Mikko Peltoniemi i in. Sää- ja ilmastotiedot sekä uudet palvelut auttavat metsäbiotaloutta sopeutumaan ilmastonmuutokseen. Finnish Meteorological Institute, styczeń 2021. http://dx.doi.org/10.35614/isbn.9789523361317.

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Climate change will increase weather induced risks to forests, and thus effective adaptation measures are needed. In Säätyö project funded by the Ministry of Agriculture and Forestry, we have summarized the data that facilitate adaptation measures, developed weather and climate services that benefit forestry, and mapped what kind of new weather and climate services are needed in forestry. In addition, we have recorded key further development needs to promote adaptation. The Säätyö project developed a service product describing the harvesting conditions of trees based on the soil moisture assessment. The output includes an analysis of the current situation and a 10-day forecast. In the project we also tested the usefulness of long forecasts beyond three months. The weather forecasting service is sidelined and supplemented by another co-operation project between the Finnish Meteorological Institute and Metsäteho called HarvesterSeasons (https://harvesterseasons.com/). The HarvesterSeasons service utilizes long-term forecasts of up to 6 months to assess terrain bearing conditions. A test version of a wind damage risk tool was developed in cooperation with the Department of Forest Sciences of the University of Eastern Finland and the Finnish Meteorological Institute. It can be used to calculate the wind speeds required in a forest area for wind damage (falling trees). It is currently only suitable for researcher use. In the Säätyö project the possibility of locating the most severe wind damage areas immediately after a storm was also tested. The method is based on the spatial interpolation of wind observations. The method was used to analyze storms that caused forest damages in the summer and fall of 2020. The produced maps were considered illustrative and useful to those responsible for compiling the situational picture. The accumulation of snow on tree branches, can be modeled using weather data such as rainfall, temperature, air humidity, and wind speed. In the Säätyö project, the snow damage risk assessment model was further developed in such a way that, in addition to the accumulated snow load amount, the characteristics of the stand and the variations in terrain height were also taken into account. According to the verification performed, the importance of abiotic factors increased under extreme snow load conditions (winter 2017-2018). In ordinary winters, the importance of biotic factors was emphasized. According to the comparison, the actual snow damage could be explained well with the tested model. In the interviews and workshop, the uses of information products, their benefits, the conditions for their introduction and development opportunities were mapped. According to the results, diverse uses and benefits of information products and services were seen. Information products would make it possible to develop proactive forest management, which would reduce the economic costs caused by wind and snow damages. A more up-to-date understanding of harvesting conditions, enabled by information products, would enhance the implementation of harvesting and harvesting operations and the management of timber stocks, as well as reduce terrain, trunk and root damage. According to the study, the introduction of information is particularly affected by the availability of timeliness. Although the interviewees were not currently willing to pay for the information products developed in the project, the interviews highlighted several suggestions for the development of information products, which could make it possible to commercialize them.

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The Spokane aquifer, Washington: its geologic origin and water-bearing and water-quality characteristics. US Geological Survey, 1988. http://dx.doi.org/10.3133/wsp2265.

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Hydraulic characteristics of, and ground-water flow in, coal-bearing rocks of southwestern Virginia. US Geological Survey, 1993. http://dx.doi.org/10.3133/wsp2388.

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Benthic invertebrate population characteristics as affected by water quality in coal-bearing regions of Tennessee. US Geological Survey, 1986. http://dx.doi.org/10.3133/wri854227.

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EXPERIMENTAL STUDY ON SEISMIC PERFORMANCE OF PEC COMPOSITE COLUMN-STEEL BEAM FRAME WITH WELDED T-STUB STRENGTHENED CONNECTIONS. The Hong Kong Institute of Steel Construction, wrzesień 2021. http://dx.doi.org/10.18057/ijasc.2021.17.3.5.

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Seismic performance of innovative Partially Encased Composite (PEC) column-steel beam composite frame was investigated, where the connection was strengthened by the welded T-stub. A ½ scale, two-storey, and one bay composite frame specimen was designed and fabricated for the quasi-static test. Through the experimental observation and measurements, the seismic performance were evaluated, including hysteretic characteristic, lateral stiffness, seismic energy dissipation, and ductility. The plastic damage evolution process and ductile failure mode were clarified. The results indicated that the welded T-stud strengthened connection enhanced the integrity of the frame and led to higher seismic strength and larger lateral stiffness. The plastic hinge was observed away from the beam end due to the welded T-stud and the specimen exhibited an approximately completed hysteretic loop. Without significant decreasing of the ultimate bearing capacity, its overall drift, ductility efficient and equivalent viscous damping ratio were 3.63% (push) / 4.07% (pull), 3.21 (push) / 3.70 (pull) and 0.261 respectively. The proposed structure possesses sound deformation, ductility, and energy-dissipation capacity with the desired plastic failure mode induced by the plastic hinges formed in all beam sections near the T-stud end and column section at the bottom, successively. It was demonstrated an ideal ductile energy-dissipation mode of the frame structure.

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