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Articoli di riviste sul tema "Slow rotating bearings"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 18 febbraio 2022

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1

Morales-Espejel, G. E., P. M. Lugt, H. R. Pasaribu, and H. Cen. "Film thickness in grease lubricated slow rotating rolling bearings." Tribology International 74 (June 2014): 7–19. http://dx.doi.org/10.1016/j.triboint.2014.01.023.

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2

Jamaludin, N., D. Mba, and R. H. Bannister. "Condition monitoring of slow-speed rolling element bearings using stress waves." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 215, no. 4 (2001): 245–71. http://dx.doi.org/10.1177/095440890121500401.

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Condition monitoring of rolling element bearings through the use of vibration analysis is an established technique for detecting early stages of component degradation. However, this success is not mirrored at rotational speeds below 16r/min. At such speeds the energy generated from bearing defects might not show as an obvious change in signature and thus becomes undetectable using conventional vibration measuring equipment. This paper presents an investigation into the applicability of stress wave analysis for detecting early stages of bearing damage at a rotational speed of 1.12r/min (0.0187

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3

Elforjani, Mohamed. "Diagnosis and prognosis of slow speed bearing behavior under grease starvation condition." Structural Health Monitoring 17, no. 3 (2017): 532–48. http://dx.doi.org/10.1177/1475921717704620.

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The monitoring and diagnosis of rolling element bearings with acoustic emission and vibration measurements has evolved as one of the much used techniques for condition monitoring and diagnosis of rotating machinery. Furthermore, recent developments indicate the drive toward integration of diagnosis and prognosis algorithms in future integrated machine health management systems. With this in mind, this article is an experimental study of slow speed bearings in a starved lubricated contact. It investigates the influence of grease starvation conditions on detection and monitoring natural defect i

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4

Nienhaus, K., F. D. Boos, K. Garate, and R. Baltes. "Development of Acoustic Emission (AE) based defect parameters for slow rotating roller bearings." Journal of Physics: Conference Series 364 (May 28, 2012): 012034. http://dx.doi.org/10.1088/1742-6596/364/1/012034.

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5

Belfiore, Nicola Pio, Carlo Costa, Rosanna Pileggi, Fabio Botta, and Claudio Guarnaschelli. "An accelerated test stand to assess wear in offshore wind turbines rolling bearings." Wind Engineering 42, no. 2 (2018): 136–40. http://dx.doi.org/10.1177/0309524x18756963.

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Rolling bearings are universally adopted to serve as revolute joints in almost all mechanisms or machines, because they offer a convenient solution to the problem of minimizing friction and, simultaneously, providing a large load-carrying capacity at any kinematic regime, including slow or alternate rotations. However, in offshore wind turbines not only they reach large dimensions but also they move within strong electromagnetic fields created by the turbine generators. For example, considering the last amplification stadium epicyclic gearbox, they may serve to sustain elements rotating around

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6

Chiementin, Xavier, Fabrice Bolaers, and Jean-Paul Dron. "Early Detection of Fatigue Damage on Rolling Element Bearings Using Adapted Wavelet." Journal of Vibration and Acoustics 129, no. 4 (2007): 495–506. http://dx.doi.org/10.1115/1.2748475.

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Among the advanced techniques of the predictive maintenance, the vibratory analysis proves to be very effective, in particular, for monitoring rotating components such as the bearings. Their damage creates cyclic efforts which are at the origin of the processing of vibratory measurements. This processing can be made by temporal methods, frequential methods, or by time-scale methods using the wavelets for 2 decades. The wavelet transform is a very effective processing, however, the difficulties of application and interpretation of the results slow down their employment. The determination of the

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7

Qiu, Li Jun, Jia Yang, and Su Ying Xu. "The Analysis and Design of Turbocharger Thrust Bearing." Advanced Materials Research 308-310 (August 2011): 1333–36. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.1333.

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Turbocharger turbine shaft thrust bearing is the role of high-speed rotating turbine to withstand the axial force generated by the turbine shaft and a part of the axial position. Fixed on the intermediate thrust bearing on the two sides and both sides of the ring, respectively, relative sliding. Sliding contact surface produces a condition of dynamic pressure oil film structure and shape of the oil wedge. Bearing the sides of the structural design of the oil wedge slot and forming a design to solve the main content. Bearing thrust bearing stiffness and rotation in the process of stress state a

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8

Liu, Jiao, Zheng Lin Liu, Xiang Kun Meng, and Xing Xin Liang. "Study on the Performance of Water Lubricated Stern Tube Bearing Based on Fluent." Applied Mechanics and Materials 496-500 (January 2014): 692–96. http://dx.doi.org/10.4028/www.scientific.net/amm.496-500.692.

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Apply FLUENT software to establish the water lubricated rubber stern tube bearing CFD model,study temperature and pressure distribution of the bearings at different speeds of rotation. It plays an important role in improving the performance of ship water lubricated stern tube bearing and security, reliability of propulsion system. The simulation results show that increasing the shaft speed in a certain range can reduce water film temperature, the effect is obvious especially at slow entrance velocity of bearings. Both high and low pressure ranges in the middle of bearings are enlarged with the

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9

Gębura, Andrzej. "Investigation Of Tribologic Processes in Bearing Nodes with the Use of the Fam-C And Fdm-A Methods – The Model With Elevated Passive Resistance." Research Works of Air Force Institute of Technology 35, no. 1 (2014): 115–25. http://dx.doi.org/10.1515/afit-2015-0008.

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Abstract The paper discloses selected results of application of the FAM-C (a.c. generator) and FDM-A (d.c. generator) methods for comprehensive troubleshooting of bearing nodes in single-spool turbojet engines. A.c. generators provide information about slow-changing processes and, consequently, that information makes it possible to monitor radial and axial clearance of bearings as well as misalignment of shafts. On the other hand, the information transmitted by d.c. generators refers to fast-changing processes and is suitable to monitor dynamic properties of antifriction bearings: variations i

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10

Barkova, N. A., A. V. Barkov, V. V. Fedorishchev, and D. V. Grishchenko. "Bearing diagnostics of slow speed industrial rotating equipment by shock pulses." IOP Conference Series: Materials Science and Engineering 643 (November 13, 2019): 012026. http://dx.doi.org/10.1088/1757-899x/643/1/012026.

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11

Caesarendra, Wahyu, Mahardhika Pratama, Buyung Kosasih, Tegoeh Tjahjowidodo, and Adam Glowacz. "Parsimonious Network Based on a Fuzzy Inference System (PANFIS) for Time Series Feature Prediction of Low Speed Slew Bearing Prognosis." Applied Sciences 8, no. 12 (2018): 2656. http://dx.doi.org/10.3390/app8122656.

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In recent years, the utilization of rotating parts, e.g., bearings and gears, has been continuously supporting the manufacturing line to produce a consistent output quality. Due to their critical role, the breakdown of these components might significantly impact the production rate. Prognosis, which is an approach that predicts the machine failure, has attracted significant interest in the last few decades. In this paper, the prognostic approaches are described briefly and advanced predictive analytics, namely a parsimonious network based on a fuzzy inference system (PANFIS), is proposed and t

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12

Allmaier, Hannes, and David E. Sander. "Piston-Pin Rotation and Lubrication." Lubricants 8, no. 3 (2020): 30. http://dx.doi.org/10.3390/lubricants8030030.

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The rotational dynamics and lubrication of the piston pin of a Gasoline engine are investigated in this work. The clearance plays an essential role for the lubrication and dynamics of the piston pin. To obtain a realistic clearance, as a first step, a thermoelastic simulation is conducted for the aluminum piston for the full-load firing operation by considering the heat flow from combustion into the piston top and suitable thermal boundary conditions for the piston rings, piston skirt, and piston void. The result from this thermoelastic simulation is a noncircular and strongly enlarged clearan

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13

Lovell, M. R., M. M. Khonsari, and R. D. Marangoni. "The Response of Balls Undergoing Oscillatory Motion: Crossing From Boundary to Mixed Lubrication Regimes." Journal of Tribology 115, no. 2 (1993): 261–66. http://dx.doi.org/10.1115/1.2921000.

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There are many applications where determining the response of a slowly oscillating ball bearing becomes crucial. Many instrument pointing mechanisms, in particular those used for aerospace applications, contain ball bearings which sinusoidally oscillate at very slow rates over small angles. Prediction of the frictional response of these bearings is essential to designers, as the friction torque which they develop is an important factor for controlling space instruments. The friction torque associated with the motion of sinusoidally oscillating ball bearings has been found to trace out hysteres

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14

Aye, S. A., and P. S. Heyns. "Acoustic Emission-Based Prognostics of Slow Rotating Bearing Using Bayesian Techniques Under Dependent and Independent Samples." Applied Artificial Intelligence 29, no. 6 (2015): 563–96. http://dx.doi.org/10.1080/08839514.2015.1038432.

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15

Hakhamaneshi, Manouchehr, Bruce L. Kutter, Andreas G. Gavras, et al. "Database of rocking shallow foundation performance: Slow-cyclic and monotonic loading." Earthquake Spectra 36, no. 3 (2020): 1585–606. http://dx.doi.org/10.1177/8755293020906564.

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Many physical model tests have examined the performance of rocking foundations during cyclic and seismic loading. These tests varied in model size, testing equipment, superstructure properties, footing shape, supporting soil environment, and loading protocol. “FoRCy, Foundation Rocking database of Cyclic and Monotonic Loading” is a new database (published at https://datacenterhub.org/ ), summarizing the results of monotonic and slow-cyclic loading tests of rocking foundations. The database consists of columns identifying testing equipment and facility, soil, superstructure, and system properti

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16

Elforjani, M., and D. Mba. "Detecting the onset, propagation and location of non-artificial defects in a slow rotating thrust bearing with acoustic emission." Insight - Non-Destructive Testing and Condition Monitoring 50, no. 5 (2008): 264–68. http://dx.doi.org/10.1784/insi.2008.50.5.264.

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17

Ullrich, Michel, Maik Wolf, Mathias Rudolph, and Wolfgang Diller. "Shaft Integrated Electromagnetic Energy Harvester with Gravitational Torque." Designs 4, no. 2 (2020): 16. http://dx.doi.org/10.3390/designs4020016.

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This paper presents the development of an electromagnetic energy harvester for electrical supply of a sensor unit integrated on the rotating inner ring of a rolling bearing. This energy harvester is of special interest for condition monitoring tasks on rotating shafts. A sensory monitor on the inner ring can detect wear conditions at an early stage. The harvester works without mechanical and energetic contact to surrounding components by utilizing the rotational energy of the shaft. The functionality of the Energy Harvester is enabled by the inertia principle, which is caused by an asymmetrica

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18

Panagiotidou, Andriani I., George Gazetas, and Nikos Gerolymos. "Pushover and Seismic Response of Foundations on Stiff Clay: Analysis with P-Delta Effects." Earthquake Spectra 28, no. 4 (2012): 1589–618. http://dx.doi.org/10.1193/1.4000084.

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Finite-element analyses are performed for the response to lateral monotonic, slow-cyclic, and seismic loading of rigid footings carrying tall slender structures and supported on stiff clay. The response involves mainly footing rotation under the action of overturning moments from the horizontal external force on—or the developing inertia at—the mass of the structure, as well as from the aggravating contribution of its weight (P-delta effect). Emphasis is given to the conditions for collapse of the soil-foundation-structure system. Two interconnected mechanisms of nonlinearity are considered: d

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19

Zhang, Qiang, TianMin Wu, Chen Chen, Shaul Mukamel, and Wei Zhuang. "Molecular mechanism of water reorientational slowing down in concentrated ionic solutions." Proceedings of the National Academy of Sciences 114, no. 38 (2017): 10023–28. http://dx.doi.org/10.1073/pnas.1707453114.

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Water dynamics in concentrated ionic solutions plays an important role in a number of material and energy conversion processes such as the charge transfer at the electrolyte–electrode interface in aqueous rechargeable ion batteries. One long-standing puzzle is that all electrolytes, regardless of their “structure-making/breaking” nature, make water rotate slower at high concentrations. To understand this effect, we present a theoretical simulation study of the reorientational motion of water molecules in different ionic solutions. Using an extended Ivanov model, water rotation is decomposed in

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20

Koike, Hitonobu, Edson Costa Santos, Katsuyuki Kida, Takashi Honda, and Justyna Rozwadowska. "Effect of Repeated Induction Heating on Fatigue Crack Propagation in SAE 52100 Bearing Steel." Advanced Materials Research 217-218 (March 2011): 1266–71. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.1266.

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Martensitic high carbon high strength SAE 52100 bearing steel is one of the main alloys used for rolling contact applications when high wear and fatigue resistance are required. Refining the microstructure of steel improves its mechanical properties (e.g. toughness). In this work SAE 52100 specimens were exposed to repeated induction heating process and rotation bending tests were performed using single- and repeatedly heat-treated material in order to investigate the influence of this cyclic heat treatment on the mechanical properties of SAE 52100. In an attempt to determine the effect of the

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21

Saeed, Nasser A., and Mostafa Eissa. "Bifurcation Analysis of a Transversely Cracked Nonlinear Jeffcott Rotor System at Different Resonance Cases." June 2019 24, no. 2 (2019): 284–302. http://dx.doi.org/10.20855/ijav.2019.24.21309.

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This work focuses on the dynamical behaviour and bifurcations of a vertically supported Jeffcott rotor system having a transverse crack and nonlinear stiffness characteristics at the primary, sub-harmonic, and super-harmonic resonance cases. The nonlinear restoring force due to the bearing-clearance, the crack breathing, the disc eccentricity, and the orientation angle between the crack and imbalance direction are considered in the system model. The equations governing the system motion are derived and solved analytically by applying the Multiple Scales Perturbation Technique (MSPT). The slow-

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22

Li, Lijuan, Richard E. Perrier, Donald R. Eaton, and Michael J. McGlinchey. "The reactions of nitrosoarenes with cationic cyclohexadienyl complexes of iron tricarbonyl: an ESR study." Canadian Journal of Chemistry 67, no. 11 (1989): 1868–77. http://dx.doi.org/10.1139/v89-290.

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The reactions of nitrosoarenes with the (cyclohexadienyl)Fe(CO)3 cation have been investigated by using electron spin resonance spectroscopy. The radicals produced are nitroxides of the type (OC)3Fe(C6H7)(Ar)N—O• but, in some cases, disproportionation and loss of the metal carbonyl fragment leads to the corresponding C6H5(Ar)N—O• radical. With bulky nitrosoarenes, such as C6Me5NO, isomers are observed in which the aryl ring rotation is slow on the ESR time scale. The analogous reactions with the cyclohexadienyl cation derived from the B ring of (ergosteryl acetate)Fe(CO)3 lead to initial attac

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23

Rakhmanov, S. R. "Elaboration of a lubrication system for universal spindle hinges of rolling mills." Ferrous Metallurgy. Bulletin of Scientific , Technical and Economic Information 77, no. 9 (2021): 1047–53. http://dx.doi.org/10.32339/0135-5910-2021-9-1047-1053.

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The experience of running drives of most of heavy-duty rolling mills shows that the designs of universal spindles with blade hinges under conditions of increased alternating loads are most acceptable comparing with other spindles types. Open friction surfaces are the drawbacks of these types of spindles, which complicate the matter of continuous supply of lubrication. Perfected effective system of forced lubrication of rolling mill spindles hinges proposed. The facility for their lubrication has a bearing support of balancing design, spindle, in radial holes of which spring-loaded plungers are

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24

Sharma, Keshab, and Lijun Deng. "Field testing of rocking foundations in cohesive soil: cyclic performance and footing mechanical response." Canadian Geotechnical Journal 57, no. 6 (2020): 828–39. http://dx.doi.org/10.1139/cgj-2018-0734.

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This paper presents a field test program of a large-scale soil–footing-structure system designed with a rocking foundation in a cohesive soil to examine the behaviour of the system and to provide case histories for possible performance-based seismic design of foundations. The rocking system was subjected to slow cyclic loadings at various drift ratios up to 7%. Twenty-four tests were conducted for foundations with varying initial factors of safety against the bearing failure, loading directions, rotation amplitudes, and embedment. A geotechnical investigation was carried out to determine soil

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25

Jones, M. G., E. Papastergis, V. Pandya, et al. "Contribution of HI-bearing ultra-diffuse galaxies to the cosmic number density of galaxies." Astronomy & Astrophysics 614 (June 2018): A21. http://dx.doi.org/10.1051/0004-6361/201732409.

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We estimate the cosmic number density of the recently identified class of HI-bearing ultra-diffuse sources (HUDs) based on the completeness limits of the ALFALFA survey. These objects have HI masses approximately in the range 8.5 < logMHI∕M⊙ < 9.5, average r-band surface brightnesses fainter than 24 mag arcsec−2, half-light radii greater than 1.5 kpc, and are separated from neighbours by at least 350 kpc. In this work we demonstrate that they contribute at most ~6% of the population of HI-bearing dwarfs detected by ALFALFA (with similar HI masses), have a total cosmic number density of (

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26

Popescu, Florin Dumitru, Sorin Mihai Radu, Krzysztof Kotwica, Andrei Andraș, and Ildiko Kertesz (Brînaș). "Simulation of the Time Response of the ERc 1400-30/7 Bucket Wheel Excavator’s Boom during the Excavation Process." Sustainability 11, no. 16 (2019): 4357. http://dx.doi.org/10.3390/su11164357.

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The sustainability of lignite production requires, among other factors, cost reduction, high efficiency, as well as the increase of the production capacity. In order to rationalize and increase the efficiency of lignite mines, the optimization of the production process is necessary. In this respect, equipment revitalization and modernization is a key issue. This paper deals with the analysis of the time response of the boom structure of a bucket wheel excavator (BWE) during operation. For this, we propose a virtual model of the boom, on which a variable-in-time force generated by the bucket wh

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27

Oravec, Milan, Pavol Lipovský, Miroslav Šmelko, Pavel Adamčík, Mirosław Witoś, and Jerzy Kwaśniewski. "Low-Frequency Magnetic Fields in Diagnostics of Low-Speed Electrical and Mechanical Systems." Sustainability 13, no. 16 (2021): 9197. http://dx.doi.org/10.3390/su13169197.

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The magnetic field created by technical devices is a source of information. This information could be used in contactless diagnostics and predictive maintenance or for resolving problems along with standard NDT (nondestructive testing) methods, especially if we consider large, slow-speed devices, such as electromotors, transmissions, or generators. Identification of causalities of device failure processes with near magnetic field is one of the suitable NDT methods improving sustainability of systems. The measurements presented in the article were performed with the VEMA 04 fluxgate vector magn

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28

Wang, Jin, Krzysztof S. Bankiewicz, Robert J. Plunkett, and Edward H. Oldfield. "Intrastriatal implantation of interleukin-1." Journal of Neurosurgery 80, no. 3 (1994): 484–90. http://dx.doi.org/10.3171/jns.1994.80.3.0484.

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✓ Intrastriatal implantation with dopaminergic or nondopaminergic tissue can elicit behavioral recovery in parkinsonian animals. Because in these animals, especially in 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-lesioned monkeys, there are still considerable numbers of dopaminergic neurons left in the mesencephalon, implantation-induced trophic effects on host residual dopaminergic neurons have been suggested as a mechanism underlying the behavioral recovery. Gliosis around the graft is a universal finding in any implantation procedure and is probably mediated by interleukin-1 (IL-1); in add

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29

Howard, Samuel A., and Luis San Andrés. "A New Analysis Tool Assessment for Rotordynamic Modeling of Gas Foil Bearings." Journal of Engineering for Gas Turbines and Power 133, no. 2 (2010). http://dx.doi.org/10.1115/1.4001997.

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Gas foil bearings offer several advantages over traditional bearing types that make them attractive for use in high-speed turbomachinery. They can operate at very high temperatures, require no lubrication supply (oil pumps, seals, etc.), exhibit very long life with no maintenance, and once operating airborne, have very low power loss. The use of gas foil bearings in high-speed turbomachinery has been accelerating in recent years although the pace has been slow. One of the contributing factors to the slow growth has been a lack of analysis tools, benchmarked to measurements, to predict gas foil

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30

Walker, Cody, and Jamie Coble. "Wind Turbine Bearing Fault Detection Using Adaptive Resampling and Order Tracking." International Journal of Prognostics and Health Management 9, no. 2 (2020). http://dx.doi.org/10.36001/ijphm.2018.v9i2.2735.

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Wind energy is growing increasingly popular in the United States, so it is imperative to make it as cost competitive as possible. Operations and Maintenance (O&M) make up 20-25% of the total cost of onshore wind projects. Unplanned maintenance contributes approximately 75% of the total maintenance costs (WWEA, 2012). Condition-based maintenance strategies intend to maximize the uptime by reducing to the amounts of unplanned maintenance. This should result in an overall decrease in the cost of maintenance. Wind turbines produce an interesting challenge, because their main shaft rotation is

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31

Kejian, Jiang, Zhu Changsheng, and Tang Ming. "A Uniform Control Method for Imbalance Compensation and Automation Balancing in Active Magnetic Bearing-Rotor Systems." Journal of Dynamic Systems, Measurement, and Control 134, no. 2 (2011). http://dx.doi.org/10.1115/1.4005279.

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The undesired synchronous vibration due to rotor mass imbalance is a main disturbance source in all rotating machinery including active magnetic bearing (AMB)-rotor systems. In the AMB-rotor system, imbalance compensation, which causes the AMB actuators to spin a rotor about its geometric axis, and automation balancing, which spins a rotor about its inertial axis, are two kinds of common control aim for the rotor imbalance control. In this study, the internal relation between the imbalance compensation and the automation balancing is analyzed and a uniform control method is proposed. With the

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32

Pier, Benoît, and Peter J. Schmid. "Optimal energy growth in pulsatile channel and pipe flows." Journal of Fluid Mechanics 926 (September 6, 2021). http://dx.doi.org/10.1017/jfm.2021.702.

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Pulsatile channel and pipe flows constitute a fundamental flow configuration with significant bearing on many applications in the engineering and medical sciences. Rotating machinery, hydraulic pumps or cardiovascular systems are dominated by time-periodic flows, and their stability characteristics play an important role in their efficient and proper operation. While previous work has mainly concentrated on the modal, harmonic response to an oscillatory or pulsatile base flow, this study employs a direct–adjoint optimisation technique to assess short-term instabilities, identify transient ener

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