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Journal articles on the topic 'Bearing rotations'

Author: Grafiati

Published: 4 June 2021

Last updated: 15 February 2022

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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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11

Fujioka, Yasuo, and Tomotsugu Sakai. "Rotating Loosening Mechanism of a Nut Connecting a Rotary Disk Under Rotating-Bending Force." Journal of Mechanical Design 127, no. 6 (2005): 1191–97. http://dx.doi.org/10.1115/1.2049087.

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Structures composed of a rotary disk and a shaft, which are fastened with bolts and nuts having tapered bearing surfaces, are loaded with a rotating-bending force. Upon investigation, two rotating mechanisms of the nut were derived. In one mechanism a high-pressure contact area is formed at the nearest loading point on threads and bearing surfaces. This leads to a difference in the curvature radii between the bearing surface of the disk and that of the nut. During the revolution of the disk, two friction torques occur in opposite directions on the bearing surface and the threads, respectively.

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12

Shah, Rajesh C., and Rajiv B. Shah. "Ferrofluid lubrication of circular squeeze film bearings controlled by variable magnetic field with rotations of the discs, porosity and slip velocity." Royal Society Open Science 4, no. 12 (2017): 170254. http://dx.doi.org/10.1098/rsos.170254.

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Based on the Shliomis ferrofluid flow model (SFFM) and continuity equation for the film as well as porous region, modified Reynolds equation for lubrication of circular squeeze film bearings is derived by considering the effects of oblique radially variable magnetic field (VMF), slip velocity at the film–porous interface and rotations of both the discs. The squeeze film bearings are made up of circular porous upper disc of different shapes (exponential, secant, mirror image of secant and parallel) and circular impermeable flat lower disc. The validity of Darcy's Law is assumed in the porous re

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13

Xiang, Jiawei, Zhansi Jiang, and Xuefeng Chen. "A Class of Wavelet-Based Rayleigh-Euler Beam Element for Analyzing Rotating Shafts." Shock and Vibration 18, no. 3 (2011): 447–58. http://dx.doi.org/10.1155/2011/563124.

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A class of wavelet-based Rayleigh-Euler rotating beam element using B-spline wavelets on the interval (BSWI) is developed to analyze rotor-bearing system. The effects of translational and rotary inertia, torsion moment, axial displacement, cross-coupled stiffness and damping coefficients of bearings, hysteric and viscous internal damping, gyroscopic moments and bending deformation of the system are included in the computational model. In order to get a generalized formulation of wavelet-based element, each boundary node is collocated six degrees of freedom (DOFs): three translations and three

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14

Savage, M., C. Brikmanis, D. G. Lewicki, and J. J. Coy. "Life and Reliability Modeling of Bevel Gear Reductions." Journal of Mechanisms, Transmissions, and Automation in Design 110, no. 2 (1988): 189–96. http://dx.doi.org/10.1115/1.3258925.

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A reliability model is presented for bevel gear reductions with either a single input pinion or dual input pinions of equal size. The dual pinions may or may not have the same power applied for the analysis. The gears may be straddle mounted or supported in a bearing quill. The reliability model is based on the Weibull distribution. The reduction’s basic dynamic capacity is defined as the output torque which may be applied for one million output rotations of the bevel gear with a 90 percent probability of reduction survival. The components on which the reduction’s life and reliability are base

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15

Sioma, Andrzej, and Sławomir Blok. "Finding Bearing in Robot Navigation with the Use of the Kalman Filter." Solid State Phenomena 199 (March 2013): 241–46. http://dx.doi.org/10.4028/www.scientific.net/ssp.199.241.

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In robotic systems navigation, it is necessary to determine the direction, in which the local coordinate system of a robot is to be turned in regards to the reference, global system. That direction from mathematical point of view is the rotation along one axis of the reference system, such that the reference system coincides with the local system associated with the body, which direction is defined. There is an assumption that the rotations along two other axes do not exist or they were taken into account in the calculations. A question appears: what is the measurement of the direction based o

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16

Zirkelback, Nicole L., and Jerry H. Ginsberg. "Ritz Series Analysis of Rotating Shaft System: Validation, Convergence, Mode Functions, and Unbalance Response." Journal of Vibration and Acoustics 124, no. 4 (2002): 492–501. http://dx.doi.org/10.1115/1.1501081.

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A shaft with attached rigid disks is modeled as a rotating Timoshenko beam supported by nonconservative, flexible bearing supports. The continuous shaft-disk system is described with kinetic and potential energy functionals that fully account for transverse shear, translational and rotatory inertia, and gyroscopic coupling. Ritz series expansions are used to describe the flexural displacements and cross-sectional rotations about orthogonal fixed axes. The equations of motion are derived from Lagrange’s equations and placed in a state-space form that preserves the skew-symmetric gyroscopic matr

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17

Georgiadis, M., and R. Butterfield. "Displacements of footings on sand under eccentric and inclined loads." Canadian Geotechnical Journal 25, no. 2 (1988): 199–212. http://dx.doi.org/10.1139/t88-024.

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Results of an investigation of the response of footings on sand, under eccentric and inclined loads, are presented. Apparatus was constructed that could simultaneously apply loads to footings at any eccentricity and inclination, without imposing restraints on the footing displacements. The experimental results are interpreted, compared with published data, and a method for predicting vertical and horizontal displacements and rotations of loaded footings on sand developed. At low load levels the analysis generates the elastic half-space solution, which is then augmented to provide the complete

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18

Sikorski, Jakub, and Witold Pawłowski. "Innovative designs of angular contact ball bearings systems preload mechanisms." Mechanik 91, no. 2 (2018): 138–40. http://dx.doi.org/10.17814/mechanik.2018.2.29.

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Presented are two mechanisms to simplify preloading operations in angular contact ball bearings systems supporting rotating machines’ shafts. The proposed systems also significantly improve its later adjustment during machine exploitation. In the presented solutions, the tensioning force of the bearing comes from a system of appropriately shaped elements with rotational-wedge surfaces, rotation of which makes them mutually extend and consequently obtain the tensioning force for the angular contact ball bearings.

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19

Nadia, Bendaoud, and Mehala Kadda. "Numerical Analysis of the Fluid Flow Behavior in the Plain Journal Bearing at Textured and Not Textured Surface." International Journal of Surface Engineering and Interdisciplinary Materials Science 9, no. 1 (2021): 40–59. http://dx.doi.org/10.4018/ijseims.2021010103.

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Hydrodynamic plain bearings are components that provide the guiding in rotation of rotating machines, such as turbines, the reactors. This equipment works under very severe operating conditions. In order to improve the hydrodynamic performance of these rotating machines, the industrialists specialized in the manufacture of hydrodynamic bearings have designed a bearing model with its textured interior surface. The numerical analysis is carried out to study the for both plain bearings types with a textured a non-textured surface thus to see the improvement of the plain bearing hydrodynamic perfo

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20

Ding, Jiakai, Liangpei Huang, Dongming Xiao, and Lingli Jiang. "A Fault Feature Extraction Method for Rolling Bearing Based on Intrinsic Time-Scale Decomposition and AR Minimum Entropy Deconvolution." Shock and Vibration 2021 (January 12, 2021): 1–19. http://dx.doi.org/10.1155/2021/6673965.

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It is very difficult to extract the feature frequency of the vibration signal of the rolling bearing early weak fault and in order to extract its feature frequency quickly and accurately. A method of extracting early weak fault vibration signal feature frequency of the rolling bearing by intrinsic time-scale decomposition (ITD) and autoregression (AR) minimum entropy deconvolution (MED) is proposed in this paper. Firstly, the original early weak fault vibration signal of the rolling bearing is decomposed by the ITD algorithm to proper rotations (PRs) with fault feature frequency. Then, the sam

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21

Tomioka, Jun, and Norifumi Miyanaga. "156 Measurement of Frequency Dependence of O-rings for Bearing Support under High-Speed Rotations." Proceedings of Yamanashi District Conference 2008 (2008): 29–30. http://dx.doi.org/10.1299/jsmeyamanashi.2008.29.

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22

Jei, Yang-Gyu, and Young-Ju Kim. "Modal Testing Theory of Rotor-Bearing Systems." Journal of Vibration and Acoustics 115, no. 2 (1993): 165–76. http://dx.doi.org/10.1115/1.2930327.

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Since all dynamic characteristics of rotor systems are closely related with rotor rotations, the directivity of modes is very important in rotor dynamics. But the classical modal testing theories which have been applied to nonrotating structures were often applied to rotor systems. Whereas the dynamic characteristics in negative frequency region have no meanings in nonrotating stuctures, the dynamic characteristics of rotor systems in the negative frequency region which are different from those in the positive frequency region have significant physical meanings. Here a new modal testing theory

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23

Hara, Daisuke, Yasuharu Nakashima, Satoshi Hamai, et al. "Kinematic Analysis of Healthy Hips during Weight-Bearing Activities by 3D-to-2D Model-to-Image Registration Technique." BioMed Research International 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/457573.

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Dynamic hip kinematics during weight-bearing activities were analyzed for six healthy subjects. Continuous X-ray images of gait, chair-rising, squatting, and twisting were taken using a flat panel X-ray detector. Digitally reconstructed radiographic images were used for 3D-to-2D model-to-image registration technique. The root-mean-square errors associated with tracking the pelvis and femur were less than 0.3 mm and 0.3° for translations and rotations. For gait, chair-rising, and squatting, the maximum hip flexion angles averaged 29.6°, 81.3°, and 102.4°, respectively. The pelvis was tilted ant

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24

Tian, Jing, Yan-Ting Ai, Cheng-Wei Fei, Feng-Ling Zhang, and Yat-Sze Choy. "Dynamic modeling and simulation of inter-shaft bearings with localized defects excited by time-varying displacement." Journal of Vibration and Control 25, no. 8 (2019): 1436–46. http://dx.doi.org/10.1177/1077546318824927.

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To accurately describe the dynamic features of inter-shaft bearings with localized defect under operation, the dynamic model of inter-shaft bearing with localized defects was established with respect to time-varying displacement excitation. Based on fault simulations on a birotor experimental rig, the developed dynamic model of inter-shaft bearing is validated to have high accuracy (over 99%) when localized defects happen on inner and outer race with co- and counter-rotation, which indicates that the model can be adopted to simulate the faults of inter-shaft bearing instead of experiment. Thro

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25

Szaniawski, Rafal, Marek Lewandowski, Jean-Louis Mansy, Olivier Averbuch, and Frederic Lacquement. "Syn-folding remagnetization events in the French-Belgium Variscan thrust front as markers of the fold-and-thrust belt kinematics." Bulletin de la Société Géologique de France 174, no. 5 (2003): 511–23. http://dx.doi.org/10.2113/174.5.511.

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Abstract New paleomagnetic studies have been carried out within the Ardennes segment of the N France - S Belgium Variscan fold-and-thrust belt to set constraints on the fold-thrust belt kinematics and reveal the casual relationships between vertical-axis rotations and major strike deviated zones localised along the general trend of the belt. Magnetite-bearing Devonian and Carboniferous limestones yielded two characteristic, secondary components of the natural remanent magnetization : a low temperature component recorded most probably during the late stages of folding and a high temperature com

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26

Chizewski, Michael G., and Loren Z. F. Chiu. "Contribution of calcaneal and leg segment rotations to ankle joint dorsiflexion in a weight-bearing task." Gait & Posture 36, no. 1 (2012): 85–89. http://dx.doi.org/10.1016/j.gaitpost.2012.01.007.

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27

Lazarević, Damir, Josip Atalić, Joško Krolo, Mario Uroš, and Marta Šavor. "Experimental and Numerical Analysis of Traditional Column Connections with the Possible Retrofit Concept." Advanced Materials Research 133-134 (October 2010): 479–84. http://dx.doi.org/10.4028/www.scientific.net/amr.133-134.479.

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Several historical constructions in Croatia have permanent column problems, particularly at connections with capitals and bases, characterized by specific fractures. Experimental and numerical analysis of traditional column connections were conducted. Distinct fractures concentrated around the connections, as well as the traces of previous restorations noted by the chronicles, intrigued us to conduct research of the possible fundamental deficiency of the structural system. Traditional connections can be described as carefully smoothed stone contact areas, joined with centrally placed iron dowe

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28

Finley, Margaret A., Elizabeth Euiler, Shivayogi V. Hiremath, and Joseph Sarver. "Movement Coordination During Humeral Elevation in Individuals With Newly Acquired Spinal Cord Injury." Journal of Applied Biomechanics 36, no. 5 (2020): 345–50. http://dx.doi.org/10.1123/jab.2019-0387.

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Humeral elevation is a critical motion for individuals who use a manual wheelchair given that, in a typical day, wheelchair users reach overhead 5 times more often than able-bodied controls. Kinematic analyses in individuals with chronic spinal cord injury (SCI) have focused on weight-bearing tasks rather than overhead reaching. This technical report presents shoulder movement coordination during overhead reaching in individuals with newly acquired SCI. Eight volunteers with acute SCI and 8 matched, uninjured controls participated. Three-dimensional kinematics were collected during seated, hum

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29

Holka, Henryk, and Tomasz Jarzyna. "Modelling of vertical shaft of mixed-flow pump." Archive of Mechanical Engineering 60, no. 4 (2013): 531–44. http://dx.doi.org/10.2478/meceng-2013-0032.

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Abstract The aim of the work was modelling of shaft and calculation of natural vibration frequencies and critical rotations of a large-size, vertical mixed flow pump of total length l=4866 mm. Equations of motion were determined analytically, and then calculation results were verified by numerical modelling. The difficulty of the problem consisted in the shaft bearing, in which four hydrodynamic bearings of unknown parameters were applied. A four-mass beam supported on flexible supports of rigidity k and damping c was assumed as the discrete model of the shaft. Equations of motion for the syst

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30

Goodwin, M. J., P. J. Ogrodnik, M. P. Roach, L. K. Lim, and Y. Fang. "Steady Load-Carrying Capacity of Recessed Hydrodynamic Bearings." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 209, no. 4 (1995): 255–62. http://dx.doi.org/10.1243/pime_proc_1995_209_436_02.

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Oil-film hydrodynamic bearings are one of the most common forms of bearing used in rotating machinery. Because of their effect on system unbalance response and stability, care has to be exercised in the design of machines running in hydrodynamic bearings—for example they cannot usually be used in machines operating at high rotational speeds when the steady load on the bearing is low. A novel form of hydrodynamic bearing which incorporates recesses in the bearing surface has been proposed by the authors which improves the dynamic characteristics; however, earlier work has not fully assessed the

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31

Qiang, He, Li Lili, Ren Fengzhang, and Volinsky Alex. "Numerical Simulation and Experimental Study of the Hydrostatic Spindle with Orifice Restrictors." Open Mechanical Engineering Journal 10, no. 1 (2016): 79–92. http://dx.doi.org/10.2174/1874155x01610010079.

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Based on the theory of hydrostatic bearings, this paper presents a study of replacing the rolling bearings in a cold drawing spindle with the liquid hydrostatic bearings. An unloading mechanism is designed, containing two hydrostatic radial bearings and a thrust bearing, according to the mechanical characteristics of the spindle. In this study, a mathematical model of the hydrostatic bearing oil pad is developed. The effects of the rotating speed on pressure and flow fields of the oil pad are simulated using the finite element analysis and verified experimentally. The pressure in all recesses

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32

Li, Chao Feng, Shi Hua Zhou, and Jie Liu. "Numerical Simulation of a Bending-Torsion Coupling Gear Transmission System." Applied Mechanics and Materials 448-453 (October 2013): 3403–7. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.3403.

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Based on the establishment of angular contact ball bearing mechanical model, a nonlinear coupled lateral, torsional and axial dynamic model of helical gear-rotor-bearing system is established, and the dynamic differential equations of the coupled lateral-torsional-axial nonlinear vibration are deduced for imbalance rotors. The investigations are systematically carried out by oscillograms and spectrograms with rotating speed, taking into account eccentricity and nonlinear supporting by rolling bearing. The results show that the rotation frequency of the driven shaft appears in the driving shaft

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33

Ay, Emel, Didier Le Nouën, Hélène Chaumeil, Markus Neuburger, Théophile Tschamber, and Patrice Jacques. "Concerning restricted rotations in pyridinyl anisoles and pyridinyl phenols bearing saturated handles, and their solid state structures." Tetrahedron Letters 55, no. 43 (2014): 5979–83. http://dx.doi.org/10.1016/j.tetlet.2014.09.002.

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34

Yang, Jiapeng, and Qi An. "Calculating method of the fatigue life for the main supporting bearing of mixing drum in concrete mixing truck when considering drum’s vibration." Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 233, no. 2 (2018): 223–35. http://dx.doi.org/10.1177/1464419318770893.

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It has been observed that there are many studies focusing on the vibration properties of bearings caused by manufacturing errors, assembly related errors, out-of-balance rotor rotation, cage instability, etc. But there are fewer research studies on the effect of rotor’s vibration on double-row rolling element bearings’ mechanical properties. In this paper, a calculating method has been established for bearing’s roller load and fatigue life when considering rotor’s vibration. And this model is applied to study the main supporting bearing of the mixing drum of a certain type of concrete mixing t

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35

P., Karuppusamy. "Comparative Analysis an Early Fault Diagnosis Approaches in Rotating Machinery by Convolution Neural Network." June 2021 3, no. 2 (2021): 99–113. http://dx.doi.org/10.36548/jei.2021.2.003.

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In several industrial applications, rotating machinery is widely utilized in various forms. A growing amount of study, in the academic and industrial fields, as a potential sector for the confidentiality of modern industrial labor systems, has been drawing early fault diagnosis (EFD) techniques. However, EFD plays an essential role in providing sufficient information for performing maintenance activities, preventing and reducing financial loss and disastrous defaults. Many of the existing techniques for identifying rotations were ineffective. For the identification of spinning machine faults,

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36

P., Karuppusamy. "Comparative Analysis an Early Fault Diagnosis Approaches in Rotating Machinery by Convolution Neural Network." June 2021 3, no. 2 (2021): 99–113. http://dx.doi.org/10.36548/10.36548/jei.2021.2.003.

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In several industrial applications, rotating machinery is widely utilized in various forms. A growing amount of study, in the academic and industrial fields, as a potential sector for the confidentiality of modern industrial labor systems, has been drawing early fault diagnosis (EFD) techniques. However, EFD plays an essential role in providing sufficient information for performing maintenance activities, preventing and reducing financial loss and disastrous defaults. Many of the existing techniques for identifying rotations were ineffective. For the identification of spinning machine faults,

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37

Blake, A. P., C. D. O’Loughlin, and C. Gaudin. "Capacity of dynamically embedded plate anchors as assessed through field tests." Canadian Geotechnical Journal 52, no. 1 (2015): 87–95. http://dx.doi.org/10.1139/cgj-2013-0473.

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A dynamically embedded plate anchor (DEPLA) is a rocket-shaped anchor that penetrates to a target depth in the seabed by the kinetic energy obtained through free-fall and by the anchor’s self-weight. After embedment, the central shaft is retrieved leaving the anchor flukes vertically embedded in the seabed. The flukes constitute the load bearing element as a plate anchor. This paper presents and considers field data on the embedment depth loss due to the plate anchor keying process and the subsequent bearing capacity factor of the plate anchor element. The loss in plate anchor embedment was si

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38

Polyakov, Roman, Leonid Savin, and Denis Shutin. "Reliability Improvement of Rotor Supports by Combining Rolling-Element Bearings and Fluid-Film Bearings." Applied Mechanics and Materials 630 (September 2014): 188–98. http://dx.doi.org/10.4028/www.scientific.net/amm.630.188.

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Reliability of rotating machinery is determined to a considerable degree by the bearing units. For several applications the requirements in rotation speed, bearing load and maximal vibration level are so extreme that neither rolling-element bearings nor fluid-film bearings could provide necessary performance characteristics during all regimes of operation. Hybrid bearings, which are a combination of rolling-element and fluid-film bearings, can improve performance characteristics and reliability of the rotor-bearing systems. The aim of this work is to analyze the advantages and disadvantages of

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Briend, Yvon, Eric Chatelet, Régis Dufour, Marie-Ange Andrianoely, Franck Legrand, and Sophie Baudin. "Dynamics of on-board rotors on finite-length journal bearings subject to multi-axial and multi-frequency excitations: numerical and experimental investigations." Mechanics & Industry 22 (2021): 35. http://dx.doi.org/10.1051/meca/2021034.

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On-board rotating machinery subject to multi-axial excitations is encountered in a wide variety of high-technology applications. Such excitations combined with mass unbalance forces play a considerable role in their integrity because they can cause parametric instability and rotor–stator interactions. Consequently, predicting the rotordynamics of such machines is crucial to avoid triggering undesirable phenomena or at least limiting their impacts. In this context, the present paper proposes an experimental validation of a numerical model of a rotor-shaft-hydrodynamic bearings system mounted on

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Jeevan, D., A. M. J. Bull, A. A. Amis, and C. M. Gupte. "The meniscofemoral ligament." Veterinary and Comparative Orthopaedics and Traumatology 16, no. 01 (2003): 26–31. http://dx.doi.org/10.1055/s-0038-1632751.

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SummaryA cadaveric study of ovine stifles was performed to examine the contribution of the meniscofemoral ligament to the cranio-caudal and internal-external rotatory laxity of this joint in sheep.Twenty ovine stifles were harvested, denuded of muscular attachments, and the femur and tibia fixed in bone pots. These were inserted into a four degree-of-freedom rig incorporated into a materials testing machine. Forces up to a maximum of 100N were applied in the cranial and caudal directions, and the resultant translations and coupled rotations measured. Tibial internal and external rotations in r

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Babich and Babich. "PHYTOSANITARY CONTROL OF CYST NEMATODES IN AGROBIOCENOSIS." THEORY AND PRACTICE OF PARASITIC DISEASE CONTROL, no. 20 (May 14, 2019): 63–68. http://dx.doi.org/10.31016/978-5-9902340-8-6.2019.20.63-68.

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In order to prevent the accumulation of the population of cyst nematodes, the saturation of crop rotations by host plants should not exceed: cereal grains – 40%, beets, canola and other oil-bearing cabbage – 20%, perennial grasses – 20%, potatoes – 15%. Growing potatoes in monoculture, and cereal grains in repeated crops or with an annual break, causes an increase in the level of population of the soil of golden potato and oat nematodes. In order to avoid re-placement of related crops, it is advisable to saturate crop rotations with short rotation with intermediate cabbage (oilseed radish, mus

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Woźniak, Marek, Tomasz Szydłowski, and Krzysztof Siczek. "The effect of dynamics of the swash plate–slippers–piston assembly on friction torques in bearings in compressor of cooling aggregate." Mechanics and Mechanical Engineering 24, no. 1 (2020): 42–55. http://dx.doi.org/10.2478/mme-2020-0006.

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AbstractThe swash plate type compressor utilized in car air conditioning devices and cooling system was analyzed in this study. Proper dynamic behavior of the components in such a compressor affected the correct functioning of the whole system. The aim of the study was to identify the characteristics of the main motion components in the swash plate–slippers–piston assembly of the compressor and to estimate the friction torques in its bearings. Some models of this assembly are elaborated and presented in the paper. The main components of slipper complex motion were identified, such as reciproca

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Cai, Li Gang, Gen Li, Ya Hui Cui, Tie Neng Guo, and Yong Sheng Zhao. "Study on Modeling Method and Characteristics of Bearing System with High Rotation Speed." Advanced Materials Research 842 (November 2013): 391–96. http://dx.doi.org/10.4028/www.scientific.net/amr.842.391.

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This paper established a general mathematical modeling method based on stress analysis of the angular contact ball bearing under high rotation speed. The influence of the centrifugal force and gyroscopic moment generated in the rotation process is taken into account in this mathematical model. This paper conducted in-depth research for these aspects: the stiffness characteristics of angular contact ball bearings under different load conditions and different rotational speed, internal contact deformation and the change of bearing parameters.

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Wajnert, Dawid, Jan K. Sykulski, and Bronislaw Tomczuk. "An Enhanced Dynamic Simulation Model of a Hybrid Magnetic Bearing Taking Account of the Sensor Noise." Sensors 20, no. 4 (2020): 1116. http://dx.doi.org/10.3390/s20041116.

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The paper presents simulation and experimental verification of the hybrid magnetic bearing (HMB) performance characteristics. It has been demonstrated that the additional errors from the eddy current sensors have a significant impact on the control signals. An improved mathematical model combines a nonlinear magnetic equivalent circuit of the HMB with the ordinary differential equations of its transients. These equations describe the rotor motion and the electric circuit of the system, as well as the control system required for stable levitation of the rotor. Certain harmonics have been observ

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Yu, Yongjian, Guoding Chen, Jishun Li, and Yujun Xue. "Influence of Geometric Error of Rollers on Rotational Accuracy of Cylindrical Roller Bearings." Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University 37, no. 4 (2019): 774–84. http://dx.doi.org/10.1051/jnwpu/20193740774.

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As the rotation of roller bearings is carried out under geometrical constraint of the inner ring, outer ring and multiple rollers, the motion error of the bearing should also be resulted from geometric errors of bearing parts. Therefore, it is crucial to establish the relationship between geometric errors of bearing components and motion error of assembled bearing, which contributes to improve rotational accuracy of assembled bearing in the design and machining of the bearing. For this purpose, considering roundness error and dimension error of the inner raceway, the outer raceway and rollers,

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Avery, James, Brett Packham, Hwan Koo, Ben Hanson, and David Holder. "Self-Abrading Servo Electrode Helmet for Electrical Impedance Tomography." Sensors 20, no. 24 (2020): 7058. http://dx.doi.org/10.3390/s20247058.

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Electrical Impedance Tomography (EIT) is a medical imaging technique which has the potential to reduce time to treatment in acute stroke by rapidly differentiating between ischaemic and haemorrhagic stroke. The potential of these methods has been demonstrated in simulation and phantoms, it has not yet successfully translated to clinical studies, due to high sensitivity to errors in scalp electrode mislocation and poor electrode-skin contact. To overcome these limitations, a novel electrode helmet was designed, bearing 32 independently controlled self-abrading electrodes. The contact impedance

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Bekinal, Siddappa I., Sadanand S. Kulkarni, and Soumendu Jana. "A hybrid (permanent magnet and foil) bearing set for complete passive levitation of high-speed rotors." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 20 (2016): 3679–89. http://dx.doi.org/10.1177/0954406216652647.

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This paper presents the design and development of a hybrid bearing set for complete passive levitation of a typical rotor. A hybrid bearing set consists of permanent magnet thrust bearing and radial discrete bump foil bearings. The permanent magnet thrust bearing is made up of three pairs of ring magnets arranged in rotation magnetized direction. The mathematical model to determine the force and stiffness in rotation magnetized direction configuration is presented using Coulombian model and vector approach. Bump foil bearings are designed and developed for rotor weight to provide the radial su

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Xiong, Bao Lin, and Chun Jiao Lu. "Size Effect on the Deformation Characteristic and Shear Band of Granular Material Based on Hypoplastity." Applied Mechanics and Materials 584-586 (July 2014): 1789–93. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1789.

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The deformation characteristic of granular material is important. It is important factor to analysis the bearing capacity and the thickness of granular material footings. There are many factors influence the deformation of granular material, such as material characteristic, content of water, degree of compaction, test method, etc. For analyzing size effect on the deformation characteristic of granular material, hypoplastic constitutive model considering void ratio is introduced. The influence of an initial void ratio, pressure and a mean grain diameter on the deformation is investigated by pol

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Li, Jingyuan, and Zifeng Li. "Applications of the Theory of Continuous Oil Film Lubrication of a Radial Sliding Bearing for Three Combined Conditions." Applied Physics Research 8, no. 2 (2016): 22. http://dx.doi.org/10.5539/apr.v8n2p22.

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<p class="1Body">The theory of lubrication of a radial sliding bearing is extended to three cases: the shaft neck rotation and bush rotation bearing, the rotating load bearing, and the floating sleeve bearing. For the bearing with rotating shaft neck and rotating bush, fixing the observer at the bushing can enable the determination, in a simple and more accurate manner, of the bearing capacity of the bearing with the rotating load. As long as a rotating load exists, whirl exists; if the shaft rotation speed is 2 times the load rotation speed, then the eccentricity reaches the maximum.&lt

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Delprete, Cristiana, and Abbas Razavykia. "Piston dynamics, lubrication and tribological performance evaluation: A review." International Journal of Engine Research 21, no. 5 (2018): 725–41. http://dx.doi.org/10.1177/1468087418787610.

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Mechanical power loss of lubricated and bearing surfaces serves as an attractive domain for study and research in the field of internal combustion engines. Friction reduction at lubricated and bearing surface is one of the most cost-effective ways to reduce gas emission and improve internal combustion engines’ efficiency. This thus motivates automotive industries and researchers to investigate tribological performance of internal combustion engines. Piston secondary motion has prime importance in internal combustion engines and occurs due to unbalanced forces and moments in a plane normal to t

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