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Relevant bibliographies by topics / Bearing rotations

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Journal articles

Academic literature on the topic 'Bearing rotations'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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Journal articles on the topic "Bearing rotations"

1

Miyanaga, Norifumi, and Jun Tomioka. "Development of Herringbon-Grooved Aerodynamic Journal Bearing Systems for Ultra-High-Speed Rotations." Key Engineering Materials 656-657 (July 2015): 652–57. http://dx.doi.org/10.4028/www.scientific.net/kem.656-657.652.

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It is absolutely important for ultra-compact rotational machineries to achieve sable shaft rotation at ultra-high-speed. This paper discussed herringbone-grooved aerodynamic journal bearing systems developed for the purpose. In this system, the bearings are supported by rubber-O-rings for accurate and stable operations. To grasp the possibility for stabilization, two types of O-rings with different stiffness and damping properties under bearing supporting were tested in the experiment. As the results, the bearing system demonstrated the maximum rotational speed over 460,000 rpm without unstabl

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2

El-Saeidy, Fawzi M. A. "Time-Varying Total Stiffness Matrix of a Rigid Machine Spindle-Angular Contact Ball Bearings Assembly: Theory and Analytical/Experimental Verifications." Shock and Vibration 18, no. 5 (2011): 641–70. http://dx.doi.org/10.1155/2011/941027.

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A lagrangian formulation is presented for the total dynamic stiffness and damping matrices of a rigid rotor carrying noncentral rigid disk and supported on angular contact ball bearings (ACBBs). The bearing dynamic stiffness/damping marix is derived in terms of the bearing motions (displacements/rotations) and then the principal of virtual work is used to transfer it from the bearing location to the rotor mass center to obtain the total dynamic stiffness/damping matrix. The bearing analyses take into account the bearing nonlinearities, cage rotation and bearing axial preload. The coefficients

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3

Leszko, Filip, Richard D. Komistek, Mohamed R. Mahfouz, et al. "In Vivo Kinematics of the Salto Total Ankle Prosthesis." Foot & Ankle International 29, no. 11 (2008): 1117–25. http://dx.doi.org/10.3113/fai.2008.1117.

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Background: Recent technological advancements in total ankle arthroplasty (TAA) have included the introduction of the mobile bearing concept. This bearing has several advantages, but researchers have questioned whether or not increased mobility sacrifices joint stability or durability of the implant. The present study evaluated the kinematics of this type of prosthesis implanted in patients. Materials and Methods: Fluoroscopy and 3D-to-2D registration techniques were used to determine the in vivo kinematics for 20 TAA subjects performing two activities: gait and step-up. The motion of the pros

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4

Heinen, Thomas, Damian Jeraj, Pia Vinken, and Konstantinos Velentzas. "Rotational Preference in Gymnastics." Journal of Human Kinetics 33, no. 1 (2012): 33–43. http://dx.doi.org/10.2478/v10078-012-0042-4.

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Rotational Preference in GymnasticsIn gymnastics, most skills incorporate rotations about one or more body axes. At present, the question remains open if factors such as lateral preference and/or vestibulo-spinal asymmetry are related to gymnast's rotational preference. Therefore, we sought to explore relationships in gymnast's rotation direction between different gymnastic skills. Furthermore, we sought to explore relationships between rotational preference, lateral preference, and vestibulo-spinal asymmetry. In the experiment n = 30 non-experts, n = 30 near-experts and n = 30 experts complet

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5

Kwon, Hyun Sik. "Investigation of the Influences of Thrust Loads Resulted by Helix Angle Directions of Planetary Gear Sets on Bearing Power Losses in Automotive Planetary Gear Trains." Applied Sciences 11, no. 19 (2021): 8827. http://dx.doi.org/10.3390/app11198827.

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In the recent automotive industries, automotive technologies for improving fuel efficiency have focused on the developments of reducing power losses in a transmission. As a well-developed and conventional power transmitting system, an automatic transmission is still widely used in many automotive vehicles. The automatic transmission is co-axially designed with several planetary gear sets and other mechanical parts. The co-axial arrangements and gear helix angles make the transmission necessarily include bearings for supporting loads and allowing relative rotations. In this study, the influence

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6

San Andres, Luis. "The Effect of Journal Misalignment on the Operation of a Turbulent Flow Hydrostatic Bearing." Journal of Tribology 115, no. 3 (1993): 355–63. http://dx.doi.org/10.1115/1.2921643.

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An analysis for calculation of the dynamic force and moment response in turbulent flow, orifice compensated hydrostatic journal bearings is presented. The fully developed flow of a barotropic liquid is described by variable properties, bulk-flow equations and local turbulent friction factors based on bearing surface condition. Bearing load and moments and, dynamic force and moment coefficients are calculated for perturbations in journal center displacements and misaligned journal axis rotations. Numerical results for the effect of static misalignment angles in the plane of the eccentricity vec

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7

Tozaki, Yasuyoshi, Akihiko Umeda, Hiroyuki Sonobe, Susumu Matsumoto, Takeshi Yoshimi, and Isamu Shiotsu. "Performance Evaluation of Innovative Micro-Traction-Drive-Utilized Angular-Contact Bearing." Journal of Tribology 128, no. 2 (2005): 262–66. http://dx.doi.org/10.1115/1.2162177.

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Traction drive makes oil film between two rollers, and power is transmitted by oil film shearing. It has the following characteristics. (1) Traction drive can be operated at low level of vibration and noise, so they are more suitable at higher speed rotations than gear. (2) Traction drive can change continuously the distance from the contact point of the rotating part to the axis of rotation; it is useful in continuously variable transmission (CVT). Generally-fixed-reduction-ratio-type traction drive is developed for the purpose of use by high-speed rotation taking advantage of the feature of

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8

Wang, Xinbo, Zhongwei Yin, Hulin Li, Gengyuan Gao, and Jun Cao. "Experimental comparison of CuAl10Fe3 journal bearings sliding against two different coatings." Industrial Lubrication and Tribology 71, no. 7 (2019): 956–64. http://dx.doi.org/10.1108/ilt-05-2018-0198.

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Purpose The purpose of this paper is to study the frictional behaviors of CuAl10Fe3 journal bearings sliding against chromium electroplated 42CrMo shafts and diamond-like carbon-coated 42CrMo shafts, respectively, under two different conditions and to compare the two kinds of friction pairs. Design/methodology/approach All journal bearing samples underwent 24 h running-in and repeatability verification. Then, the journal bearing friction experiments were carried out under two different conditions. After testing, the torques, friction coefficients, power consumptions and other parameters were o

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9

Henmi, Nobuhiko, and Shingo Takeuchi. "New Method Using Piezoelectric Jerk Sensor to Detect Roller Bearing Failure." International Journal of Automation Technology 7, no. 5 (2013): 550–57. http://dx.doi.org/10.20965/ijat.2013.p0550.

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An acceleration sensor is usually used to examine for roller bearing damage. It is difficult, however, to detect abnormal vibration and examine for roller bearing damage when rotation speed is low. The final target of this study is to establish a bearing damage diagnosis system based on the piezoelectric jerk sensor we developed, which can be used for both low- and highspeed rotations. For this purpose, this paper aims to identify the features of an abnormal vibration detection signal at a low rotation speed, propose a new roller bearing damage diagnosis method that uses the features, and clar

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10

King, G. J. W., and M. Laman. "Conventional and centrifuge model studies of the moment carrying capacity of short pier foundations in clay." Canadian Geotechnical Journal 32, no. 6 (1995): 976–88. http://dx.doi.org/10.1139/t95-096.

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An experimental investigation into the moment carrying capacity of short rigid pier foundations in saturated clay is described. Scale models of square piers with different breadths and depths were used in both conventional and centrifugal studies. The results show that the relationships between moment and rotation are nonlinear but do not exhibit any peak values, and that moment limits, defined by limiting angular rotations, increase with increases in pier depth and breadth. Empirical equations are derived between moment carrying capacity and pier geometry, for a range of limiting rotations, a

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