Bibliografie tematiche / Slow rotating bearings

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Letteratura scientifica selezionata sul tema "Slow rotating bearings"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 18 febbraio 2022

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Articoli di riviste sul tema "Slow rotating bearings"

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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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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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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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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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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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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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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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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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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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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Più fonti

Tesi sul tema "Slow rotating bearings"

Aye, S. A. (Sylvester Aondolumun). "Acoustic emission-based diagnostics and prognostics of slow rotating bearings using Bayesian techniques." Thesis, 2014. http://hdl.handle.net/2263/43129.

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Diagnostics and prognostics in rotating machinery is a subject of much on-going research. There are three approaches to diagnostics and prognostics. These include experience-based approaches, data-driven techniques and model-based techniques. Bayesian data-driven techniques are gaining widespread application in diagnostics and prognostics of mechanical and allied systems including slow rotating bearings, as a result of their ability to handle the stochastic nature of the measured data well. The aim of the study is to detect incipient damage of slow rotating bearings and develop diagnost

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Capitoli di libri sul tema "Slow rotating bearings"

Aye, Sylvester A., P. Stephan Heyns, and Coenie J. H. Thiart. "Diagnostics of Slow Rotating Bearings Using a Novel DAI Based on Acoustic Emission." In Applied Condition Monitoring. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-20463-5_24.

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Adams, Maurice L. "Large Steam Turbine Generator Turning-Gear Slow-Roll Journal Bearing Load Capacity." In Rotating Machinery Research and Development Test Rigs. CRC Press, 2017. http://dx.doi.org/10.1201/9781315116723-3.

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Atti di convegni sul tema "Slow rotating bearings"

Kallappa, Pattada, Carl Byington, and Bryan Donovan. "Fault Detection and Lubricant Health Monitoring for Slow Bearings in Extreme Operating Conditions." In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64019.

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Slow rotating bearings are an integral part of aerospace and turbomachinery actuation systems. These actuation systems may be driven by electric, hydraulic or fueldraulic power and often operate under high loads and extreme temperatures. This makes these actuation systems and their slow rotating bearings highly susceptible to degradation and failure. Vibration monitoring techniques are not applicable to the PHM of these bearings, because their slow speeds are unable to produce a measureable vibration signature. Furthermore, the slow bearings are sealed and use grease lubrication, thus eliminat

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Chen, Fen, Quan Liu, Qin Wei, et al. "Fault Diagnosis of Rolling Bearings Based on Multi-Scale Entropy and Ensembled Artificial Neural Network." In ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-4033.

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Rolling bearing is widely used in rotating mechanical system, and its operating state has great effects on availability, reliability and the life cycle of whole mechanical system. Therefore, fault diagnosis of rolling bearing is indispensable for the health monitoring in rotating machinery system. In this paper, a method based on multi-scale entropy (MSE) and ensembled artificial neural network (EANN) is proposed for feature extraction and fault recognition in rolling bearings respectively. MSE is mainly in charge for quantizing the complexity of the nonlinear time series in different scales.

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Howard, Samuel A., and Luis San Andre´s. "A New Analysis Tool Assessment for Rotordynamic Modeling of Gas Foil Bearings." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22508.

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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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San Andrés, Luis. "Extended Finite Element Analysis of Journal Bearing Dynamic Forced Performance to Include Fluid Inertia Force Coefficients." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87713.

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Reynolds equation governs the generation of hydrodynamic pressure in oil lubricated fluid film bearings. The static and dynamic forced response of a bearing is obtained from integration of the film pressure on the bearing surface. For small amplitude journal motions, a linear analysis represents the fluid film bearing reaction forces as proportional to the journal center displacements and velocity components through four stiffness and four damping coefficients. These force coefficients are integrated into rotor-bearing system structural analysis for prediction of the system stability and the s

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Danieli, G. A., G. Fragomeni, D. Mundo, and M. Vigna. "Proposal of a Bridge Deck Displacement Continuous Measuring Device and Periodical Realignment System Designed to Minimize Traffic Interruptions." In ASME 2002 Engineering Technology Conference on Energy. ASMEDC, 2002. http://dx.doi.org/10.1115/etce2002/struc-29004.

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The paper presents the most recent developments on electronic bridge control applied to a bridge located along a southern Italian Motorway in an area where a landslip is in slow yet continuous motion. A previous bridge was closed for beam misalignment caused by the landslip action. A new bridge was recently designed with much sturdier foundations, but even during the initial construction phases it was evident that a static solution was undesirable, if not impossible. Jet, based on the observations of the last twenty years, the foreseen movements are relatively small, 20 cm being the maximum ho

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San Andre´s, Luis, and Keun Ryu. "On the Nonlinear Dynamics of Rotor-Foil Bearing Systems: Effects of Shaft Acceleration, Mass Imbalance and Bearing Mechanical Energy Dissipation." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45763.

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Gas foil bearing (GFB) technology has reached great maturity as per engineered design and construction and its system integration into rotating machinery. Empirical research has gone beyond showing a few instances of acceptable mechanical performance, to demonstrate GFB multiple-cycle repeatable performance in spite of persistent large amplitude sub synchronous whirl motions. A GFB is a forgiving mechanical element whose engineered resilient underspring structure contains and ameliorates large rotor excursions. Analyses, however, fail to distinguish the hardening stiffness from the FB underspr

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Kim, Tae Ho, Jongsung Lee, and Young Min Kim. "Static Structural Characterization of Multilayer Gas Foil Journal Bearings." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-43959.

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The aim of this study was to evaluate the structural performance of multilayer gas foil bearings (GFBs). Three test GFBs and a dummy rotor with a diameter of 28 mm were manufactured for application to a series of structural tests. The test bearings were designed with an identical axial length of 22.5 mm, a radial clearance of 0.170 mm, and a mechanical preload of 0.050 mm at a 50% offset within the (machined) lobe bearing housings. All the bearings had multilayer (doublelayer) thin foils supported by an elastic bump strip layer, i.e., a configuration with a top foil, shim foil, and bump strip

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Saiki, Kohei, Takeshi Watanabe, and Terushige Sato. "Experimental Research on the Vibration and Noise Behavior of Helical Gearing System." In ASME 2003 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/detc2003/ptg-48028.

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Going with interior noise reduction in a vehicle, gear noise that is of pure frequency has been becoming a great influence on the comfortable driving. For decreasing the gear noise, it is important to predict precisely the gear noise behavior at the design stage before manufacturing. Therefore, it is necessary to clarify the physical mechanism of each resonance noise peak by actual measurement in the wide condition range of rotation speed and transmitting torque. In this research, a new 85kw oil-cooled motoring apparatus (Max speed: 6000rpm/135Nm, Max torque 400Nm/2000rpm) is developed for mea

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Dousti, Saeid, Jianming Cao, Amir Younan, Paul Allaire, and Tim Dimond. "Temporal and Convective Inertia Effects in Plain Journal Bearings With Eccentricity, Velocity and Acceleration." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-45880.

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Fluid film bearings are commonly analyzed with the conventional Reynolds equation, without any temporal inertia effects, developed for oil or other high viscosity lubricants. In applications with rapidly time varying external loads, e.g. ships on wavy oceans, temporal inertia effect should be taken into account. As rotating speeds increase in industrial machines and the reduced Reynolds number increases above the turbulent threshold, a form of linearized turbulence model is often used to increase the effective viscosity to take the turbulence into account. Other than the turbulence effect, wit

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Provenza, Andrew J., and Carlos R. Morrison. "Control of Fan Blade Vibrations Using Piezoelectrics and Bi-Directional Telemetry." In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-46714.

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A novel wireless device which transfers supply power through induction to rotating operational amplifiers and transmits low voltage AC signals to and from a rotating body by way of radio telemetry has been successfully demonstrated in the NASA Glenn Research Center (GRC) Dynamic Spin Test Facility. In the demonstration described herein, a rotating operational amplifier provides controllable AC power to a piezoelectric patch epoxied to the surface of a rotating Ti plate. The amplitude and phase of the sinusoidal voltage command signal, transmitted wirelessly to the amplifier, was tuned to compl

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