Zeitschriftenartikel: „Double row angular contact bearing“

1

Geng, Keke, und Shengye Lin. „Effect of angular misalignment on the stiffness of the double-row self-aligning ball bearing“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, Nr. 4 (07.11.2019): 946–62. http://dx.doi.org/10.1177/0954406219885979.

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The double-row self-aligning ball bearing commonly runs with angular misalignment between the inner and outer rings, and the angular misalignment significantly affects the bearing performance. However, the effect of angular misalignment on the dynamic characteristics of the double-row self-aligning ball bearing has not been studied thoroughly. This paper investigates the effect of angular misalignment on the stiffness of the double-row self-aligning ball bearing. The quasi-static model for the double-row self-aligning ball bearing is established with five degrees of freedom, namely, three translational displacements along x, y, and z directions and two tilting angles around x-axis and y-axis. The internal clearance between balls and raceways is included in the presented model. The formulation of the three-dimensional stiffness matrix for the double-row self-aligning ball bearing is analytically derived, and is verified by comparing with the available dada in published literature. Finally, the stiffness of the double-row self-aligning ball bearing under various angular misalignment conditions is analyzed systematically. The results show that the tilting angles vary the contact angles and contact forces of the compressed balls in the double-row self-aligning ball bearing, thus affect the bearing stiffness; the bearing stiffness decreases with the internal clearance; the angular misalignment significantly impacts the stiffness of the bearing running at a low speed.

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2

Bercea, I., D. Nélias und G. Cavallaro. „A unified and simplified treatment of the non-linear equilibrium problem of double-row rolling bearings. Part 1: Rolling bearing model“. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 217, Nr. 3 (01.03.2003): 205–12. http://dx.doi.org/10.1243/135065003765714854.

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To increase the rigidity of bearings-shaft systems, the shaft is often supported by a series of double-row rolling bearings. Little work on multiple-row rolling bearings has been published. A comprehensive model is proposed which permits the determination of the internal interactions. The total elastic deflection between bearing rings is described using a vector-and-matrix method. A variety of double-row rolling bearing types are analysed, such as tapered roller bearing, cylindrical roller bearing, spherical roller bearing, self-aligning ball bearings and angular contact ball bearing. The basic internal geometry (including the internal clearance) and the effect of the initial preload (in term of the initial axial compression) are considered.

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3

Zheng, Jingyang, Jinchen Ji, Shan Yin und Van-Canh Tong. „Fatigue life analysis of double-row tapered roller bearing in a modern wind turbine under oscillating external load and speed“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 234, Nr. 15 (17.03.2020): 3116–30. http://dx.doi.org/10.1177/0954406220911966.

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Fatigue life analysis of roller bearing is usually performed for bearings under constant rotating speed and invariant loading conditions. For the bearings used in offshore floating direct-drive wind turbines, they often experience oscillating motions with varying loading patterns, for which the standard fatigue life analysis is not valid due to the presence of fluctuating loads. This paper presents the fatigue life analysis of a double-row tapered roller bearing under oscillating external load and speed conditions, which is used to support the main shaft of a large modern direct-drive wind turbine. First, a comprehensive quasi-static model of the double-row tapered roller bearing is developed for determining the internal load distribution of rollers. The contact pressure of rollers is then studied using an iterative scheme based on the elastic contact model. After that, the formulation of basic rating life of the double-row tapered roller bearing with oscillating external load and speed is given to calculate the fatigue life. Numerical simulations are carried out to investigate the effects of the oscillating load and speed, angular misalignment, and internal clearance on the fatigue life of the bearing.

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Elsyamba, Alex Ttesa, Santoso Mulyadi und Boy Arief Fachri. „PENGARUH TIPE SINGLE DAN DOUBLE ROW ANGULAR CONTACT BALL BEARING TERHADAP ROLLING RESISTANCE“. J-Proteksion 3, Nr. 2 (28.02.2019): 35. http://dx.doi.org/10.32528/jp.v3i2.2251.

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5

Gunduz, Aydin, Jason T. Dreyer und Rajendra Singh. „Effect of bearing preloads on the modal characteristics of a shaft-bearing assembly: Experiments on double row angular contact ball bearings“. Mechanical Systems and Signal Processing 31 (August 2012): 176–95. http://dx.doi.org/10.1016/j.ymssp.2012.03.013.

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6

Sang, Lu Ping. „Turning-Milling Machining Center of Each Axis Movement Principle and the Headstock Structure Analysis“. Advanced Materials Research 912-914 (April 2014): 878–81. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.878.

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Turning milling machining center are analyzed the structure and working principle of headstock of numerical control machine tool headstock consists of motor, drive system and components of the head of a bed, is mainly used to achieve the main movement of the machine tool. Spindle structure adopts precision double row cylindrical roller bearing and two-way thrust angular contact ball bearing group and type. The machine is the best combination of lathe and milling machine. Configuration French NUM1060 system, realize five axis control, a loading card can complete a variety of difficult machining of complex.

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7

Tong, Van-Canh, und Seong-Wook Hong. „Analysis of the Stiffness and Fatigue Life of Double-Row Angular Contact Ball Bearings“. Journal of the Korean Society for Precision Engineering 34, Nr. 11 (01.11.2017): 813–21. http://dx.doi.org/10.7736/kspe.2017.34.11.813.

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8

Gunduz, Aydin, und Rajendra Singh. „Stiffness matrix formulation for double row angular contact ball bearings: Analytical development and validation“. Journal of Sound and Vibration 332, Nr. 22 (Oktober 2013): 5898–916. http://dx.doi.org/10.1016/j.jsv.2013.04.049.

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9

Adamčík, Pavel, und Zuzana Murčinková. „Impulse Response of the Elasto-Hydrodynamic Lubrication Film of a Rolling Bearing to Dynamic Excitation of a Flat Belt Drive“. Materials 13, Nr. 20 (13.10.2020): 4533. http://dx.doi.org/10.3390/ma13204533.

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The impulse response of a rolling bearing and its principal component, the elasto-hydrodynamic lubrication film (EHDL), are analysed. When measuring the vibrations of bearings, we observed that the impulse response was mostly caused by defects (fatigue damage) on the raceways and/or rolling elements. However, this phenomenon can also occur in new defect-free roller bearings, where it is not commonly expected. This study presents an experiment that identifies the conditions of dynamic excitation for the impulse response of the EHDL, the source of which is not defects, but the EHDL itself. The EHDL responds in the form of impulses in case the velocity of its radial deformation is too fast. This is an unfavourable phenomenon that significantly shortens the service life of bearings. To analyse the dynamic excitation conditions, a testing bench at speeds up to 135,000 rpm with a flat belt drive was used. The testing bench enabled the formation of the so-called beat excitation from two harmonic excitation forces close in rotational frequency. The subject of this study is a defect-free high-speed double-row angular contact ball bearing used in the textile industry. We also present other physical conditions for the occurrence of undesired impulse responses that are caused by the EHDL.

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Choi, Dong-Hoon, und Ki-Chan Yoon. „A Design Method of an Automotive Wheel-Bearing Unit With Discrete Design Variables Using Genetic Algorithms“. Journal of Tribology 123, Nr. 1 (01.08.2000): 181–87. http://dx.doi.org/10.1115/1.1329878.

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In order to improve the efficiency of the design process and the quality of the resulting design, this study proposes a design method for determining design variables of an automotive wheel-bearing unit of double-row angular-contact ball bearing type by using a genetic algorithm. The desired performance of the wheel-bearing unit is to maximize system life while satisfying geometrical and operational constraints without enlarging mounting space. The design variables selected are number of balls, initial contact angle, standard ball diameter, pitch circle diameter, preload, distance between ball centers, and wheel offset, which must be selected at the preliminary design stage. The use of gradient-based optimization methods for the design of the unit is restricted because this design problem is characterized by the presence of discrete design variables such as the number of balls and standard ball diameter. Therefore, the design problem of rolling element bearings is a constrained discrete optimization problem. A genetic algorithm using real coding and dynamic mutation rate is used to efficiently find the optimum discrete design values. To effectively deal with the design constraints, a ranking method is suggested for constructing a fitness function in the genetic algorithm. A computer program is developed and applied to the design of a real wheel-bearing unit model to evaluate the proposed design method. Optimum design results demonstrate the effectiveness of the design method suggested in this study by showing that the system life of an optimally designed wheel-bearing unit is enhanced in comparison with that of the current design without any constraint violations. It is believed that the proposed methodology can be applied to other rolling element bearing design applications.

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Ishida, Y., T. Ikeda und T. Yamamoto. „Nonlinear Forced Oscillations Caused by Quartic Nonlinearity in a Rotating Shaft System“. Journal of Vibration and Acoustics 112, Nr. 3 (01.07.1990): 288–97. http://dx.doi.org/10.1115/1.2930507.

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This paper deals with nonlinear forced oscillations in a rotating shaft system which are caused by quartic nonlinearity in a restoring force. These oscillations are theoretically analyzed by paying attention to the nonlinear components represented by the polar coordinates. It is clarified which kind of nonlinear component has an influence on each oscillation. In experiments it was shown that, when the shaft was supported by double-row angular contact ball bearings, the restoring force had nonlinear spring characteristics involving quartic nonlinearity in addition to quadratic and cubic ones. Experimental results were compared with the theoretical results regarding the probability of occurrence and the shapes of the resonance curves.

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Todić, Vladimir, Rado Maksimović und Ilija Ćosić. „MANAGING TARGET COSTS AT THE DEVELOPMENT STAGE OF A PRODUCT“. Journal of Production Engineering 23, Nr. 2 (30.12.2020): 7–15. http://dx.doi.org/10.24867/jpe-2020-02-007.

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At the development stage of a product, target cost management has a significant effect on achievement and maintenance of product competitiveness in a given market and the desired target profit as the primary aim of production. Target cost management, i.e., target profit management, is performed by evaluating individual variations of a conceptual and preliminary design solution for a new product and by choosing the solution with the lowest development costs. The paper presents the use of Adaptive Neural Fuzzy Inference System model for managing development costs on the example of double-row angular contact ball bearings as an example of applying the above approach to market positioning in relation to competitors.

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Liao, Neng Tung, und Jen Fin Lin. „An Analysis of Misaligned Single-Row Angular-Contact Ball Bearing“. Journal of Mechanical Design 126, Nr. 2 (01.03.2004): 370–74. http://dx.doi.org/10.1115/1.1667891.

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14

Li, Yunfeng, und Di Jiang. „Dynamic Carrying Capacity Analysis of Double-Row Four-Point Contact Ball Slewing Bearing“. Mathematical Problems in Engineering 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/850908.

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Carrying capacity is the most important performance index for slewing bearings. Maximizing the carrying capacity of slewing bearing is one pursuing goal for the bearing designer; this is usually realized by optimizing the design parameters. A method of analyzing the carrying capacity of double-row four-point contact ball slewing bearing by using dynamic carrying capacity surfaces was proposed in this paper. Based on the dynamic load carrying capacity surface of the slewing bearing, the effect of changes of the bearing design parameters, such as axial clearance, raceway groove radius coefficient, and contact angle, on the dynamic carrying capacity of the slewing bearing was researched; the trend and the degree of the effect of the micro changes of the bearing design parameters on the dynamic load carrying capacity of the bearing were discussed, and the results provide the basis for optimizing the design parameter of this type of slewing bearing.

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NIU, Rongjun. „Mechanical Properties Analysis of Asymmetric Double Row Four-point-contact Slewing Bearing“. Journal of Mechanical Engineering 54, Nr. 1 (2018): 177. http://dx.doi.org/10.3901/jme.2018.09.177.

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16

Zhang, Hongwei, Shuguang Chen, Yantao Dou, Hengming Fan und Yanqin Wang. „Mechanical model and contact properties of double row slewing ball bearing for wind turbine“. REVIEWS ON ADVANCED MATERIALS SCIENCE 60, Nr. 1 (01.01.2021): 112–26. http://dx.doi.org/10.1515/rams-2021-0017.

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Abstract In this paper, the mechanical models of large-scale double row slewing ball bearing considering combined loading conditions were presented based on the rigid rings and flexible rings, respectively. And the contact properties between the ball and raceway were studied. These workflows for the calculation were described and programmed by MATLAB. The load distributions of slewing bearing for 2MW wind turbine were presented. The results indicated that the load distribution with the ideal stiff assumption differs from the load distribution determined by taking into account the flexibility of rings. With flexible rings, the magnitude of contact force is less than that of the rigid rings. The influences of the initial contact angle, the coefficient of groove curvature radius, the clearance on maximum contact force were analyzed and some suggestions have been discussed. These parameters have significant effects on the load distribution. The maximum contact force decreases with coefficient of groove curvature radius decrease. A three dimensional finite element model of the slewing bearing is established and analyzed. The simulated results are compared with that of mechanical models.

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17

Wang, Yanshuang, und Qianqian Yuan. „Static load-carrying capacity and fatigue life of a double row pitch bearing with radial interference“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 228, Nr. 2 (18.04.2013): 307–16. http://dx.doi.org/10.1177/0954406213486042.

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A computational model taking into account the radial interference was first presented for determining the distribution of contact forces, static load-carrying capacity and fatigue life of a double row pitch bearing, which was subjected to the combined radial, axial and tilting moment loadings. The relation between the radial interference and the contact force distribution was analyzed. The static load-carrying capacity curves were established and the effect on the static load-carrying capacity by the change of the radial interference, coefficient of raceway groove curvature radius and initial contact angle was analyzed. The results show that with the increase in the radial interference, the maximum contact load decreases first then increases, and the basic rating fatigue life of the bearing increases first and then decreases. The radial interference value in the range of 0–0.05 mm has little effect on the static load-carrying capacity of the bearing. With the increase in the coefficient of raceway groove curvature radius and the decrease in the initial contact angle, the static load capacity of the bearing decreases.

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18

Shah, Dhaval B., Kaushik M. Patel und Ruchik D. Trivedi. „Analyzing Hertzian contact stress developed in a double row spherical roller bearing and its effect on fatigue life“. Industrial Lubrication and Tribology 68, Nr. 3 (11.04.2016): 361–68. http://dx.doi.org/10.1108/ilt-06-2015-0082.

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Purpose The purpose of this paper is to describe a method permitting the creation of a realistic model of spherical roller bearing with the aim of determining contact stress and fatigue life based on dynamic loading conditions. The paper also aims to recognize the effect of tolerance values on contact stress and fatigue life. Motion and load transmission in spherical roller bearing occurs within the assembly by elliptical curved contacting surfaces. The stress produced by the transmitted load would be very high because of least contacting area between these surfaces. Design/methodology/approach The paper describes a methodology to determine contact stress using analytically as well as finite element method for spherical roller bearing. The comparison for the both each approach for contact stress at different loading condition is carried out. Prediction of fatigue life based on dynamic loading conditions for bearing is also determined using finite element model. The effect on induced contact stress and fatigue life by varying tolerances on inner race dimensions have been found out. Findings The paper suggests that the maximum stress produces at the start or end of the contacting arc under static loading condition in spherical roller bearing. The analytical and finite element approach is in good agreement. The fatigue life prediction is useful for selecting loading conditions for various applications of double row spherical roller bearing. Tolerance level at inner ring raceway radius is kept high because of manufacturing constrain of complex curvature geometric shape. Research limitations/implications The present approach does not consider dynamic loading conditions for contact stress analysis. Therefore, researchers are encouraged to analyze the effect of wear, lubrication and other tribological aspects on bearing life. Originality/value The paper includes determination of contact stress and prediction of fatigue life for spherical roller bearing using analytical as well as finite element approach. The tolerance values at inner race are identified as per manufacturing constraint based on contact stress and fatigue life.

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Yang, Lihua, Tengfei Xu, Haoliang Xu und Yao Wu. „Mechanical behavior of double-row tapered roller bearing under combined external loads and angular misalignment“. International Journal of Mechanical Sciences 142-143 (Juli 2018): 561–74. http://dx.doi.org/10.1016/j.ijmecsci.2018.04.056.

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20

Chen, C.-K., und C.-Y. Wang. „Compensating analysis of a double circular-arc helical gear by computerized simulation of meshing“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 215, Nr. 7 (01.07.2001): 759–71. http://dx.doi.org/10.1243/0954406011524126.

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A mathematical model of a stepped double circular-arc helical tooth profile with two centre offsets is developed. The conditions of gear meshing that reflect manufacturing and assembly errors are simulated. The locations of bearing contact and the contact path pattern of mating tooth surfaces are determined by tooth contact analysis (TCA). By applying the proposed mathematical model and TCA, single error impact can be determined. To compensate for offset and angular misalignment, the authors propose an adjustable bearing whereby transmission errors can be minimized. The investigation is illustrated with several numerical examples.

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Niu, Rong Jun, Chen Niu und Xiao Juan Dai. „Life Estimation of Hub Bearing Unit Based on Test Load Spectrum“. Applied Mechanics and Materials 457-458 (Oktober 2013): 443–46. http://dx.doi.org/10.4028/www.scientific.net/amm.457-458.443.

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In the paper, the steady-state steering dynamics model of the cars is firstly established. Then, three degree of freedom model of double row angle contact ball bearing is established. Based on the mathematical model and load spectrum, wheel hub bearing unit service life is calculated and estimated. The analysis results of the service life influencing factors have an important guiding significance for the design and use of hub bearing unit.

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Liu, Jing, Shizhao Ding, Linfeng Wang, Hongwu Li und Jin Xu. „Effect of the bearing clearance on vibrations of a double-row planetary gear system“. Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 234, Nr. 2 (06.12.2019): 347–57. http://dx.doi.org/10.1177/1464419319893488.

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The bearing clearance, external torque, and input speed can greatly affect vibrations of the planetary gear system. The double-row planetary gear systems are commonly used in the gearbox of special vehicles, which are the key parts to obtain a larger gear ratio. Although many works have been presented to study those factors on vibrations of the single-row planetary gear system, a few works were focused on vibrations of the double-row planetary gear system with the bearing clearance. To overcome this problem, a multi-body dynamic model of a double-row planetary gear system with six planet bearings and one supported bearing of the sun gear is presented. This model is the main part of a gear box transmission system. The new model is developed for studying the effect of the bearing clearance on the planetary system. The meshing stiffness and damping between the gears are obtained by current methods in the listed references, as well as the contact stiffness and damping in bearings. The liner stiffness and damping model is used. The effects of the bearing clearance, external torque, and input speed on vibrations of the system are analyzed. The results show that vibrations of the ring gear and sun gear decrease with the increment of the external torque and increase with the increment of the input speed. Moreover, a reasonable bearing clearance can be helpful for reducing system vibrations for some mating external torque and input speed conditions. The results can provide some guidance to find new method to reduce vibrations and increase the service life of planetary gear systems.

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Wang, Yan-shuang, und Qian-qian Yuan. „Contact Force Distribution and Static Load-carrying Capacity of Large Size Double Row Four-point Contact Ball Bearing“. Defence Technology 9, Nr. 4 (Dezember 2013): 229–36. http://dx.doi.org/10.1016/j.dt.2013.12.003.

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24

Ricci, Mário César. „Internal Loading Distribution in Statically Loaded Ball Bearings Subjected to an Eccentric Thrust Load“. Mathematical Problems in Engineering 2009 (2009): 1–36. http://dx.doi.org/10.1155/2009/471804.

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Rolling-element bearings are simple machine elements of great utility used both in simple commercial devices as in complex engineering mechanisms. Because of being a very popular machine element, there is a lot of literature on the subject. With regard to the behavior of internal loading distribution, elastic deformations at point or line contacts, and geometric parameters under loading, although there are many works describing the parameters variation models, few works show such variations in practice, even under simple static loadings. In an attempt to cover this gap some studies are being developed in parallel. Particularly in this work, anew, iterative computational procedure is introduced which calculates internal normal ball loads in statically loaded single-row, angular-contact ball bearings, subjected to a known thrust load which is applied to a variable distance (lever arm or eccentricity) from the geometric bearing center line. Numerical examples results for a 218 angular-contact ball bearing have been compared with those from the literature. Fifty figures are presented showing geometrical features and the following parameters variations as functions of the thrust load and eccentricity: contact angle, contact ellipse parameters, normal ball loads, distances between groove curvature centers, normal and axial deflections, and loading zones.

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Parmar, Vivek, VH Saran und SP Harsha. „Nonlinear vibration response analysis of a double-row self-aligning ball bearing due to surface imperfections“. Proceedings of the Institution of Mechanical Engineers, Part K: Journal of Multi-body Dynamics 234, Nr. 3 (25.05.2020): 514–35. http://dx.doi.org/10.1177/1464419320924918.

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This work attempts to study the vibration response of a double-row self-aligning ball bearing due to surface and localized imperfections. For the contact deformation at the ball–race interactions, the Hertzian load–deflection relation is used for the evaluation of time-varying contact stiffness. The elastohydrodynamic theory is applied to find out the central film thickness. For both the inner and outer race waviness cases, the system response is observed as periodic (with vibrations of high amplitude) at [Formula: see text], i.e. multiples of Nb and its vicinity, but gradually turns to quasi-periodic as the value of waviness order reach some intermediate value. In the case of a localized defect, the double impulse phenomenon marks the entry and exit events of the rolling element in and out of the rectangular spall. Hence, this analysis can be used as a diagnostic tool with system dynamic characteristics for distributed and localized defect identification.

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Chen, Guanci, Ping Jia und Jianqiang He. „Effects of geometric parameters on static load capacity of a double-row four-point contact ball bearing“. Journal of Mechanical Science and Technology 27, Nr. 4 (April 2013): 1053–61. http://dx.doi.org/10.1007/s12206-013-0228-2.

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27

Zhu, Yi-Li, und Zhong-Qiao Zheng. „The use of double-decker catcher bearing with face-to-face installed inner layer bearings“. Modern Physics Letters B 31, Nr. 19-21 (27.07.2017): 1740012. http://dx.doi.org/10.1142/s0217984917400127.

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In active magnetic bearing (AMB) system, the catcher bearings (CB) are indispensable to temporarily support the rotor from directly impacting the stators. In most cases, traditional CB cannot bear the ultra-high speed, vibrations and impacts after a rotor drop event. To address the shortcomings, a double-decker ball bearing (DDBB) with inner two face-to-face angular contact ball bearings are proposed to be used as CB in an AMB system, and the dynamic response of the rotor after a rotor drop event is experimentally analyzed. The results indicate that using a DDBB as a CB helps to reduce the following collision forces after a rotor drop. Larger ball initial contact angles and smaller pre-load force on the inner layer bearings, larger radial clearance of the outer layer bearing and choosing AISI 10AISI 1045 steel which has a larger density for the adapter ring can effectively reduce the maximum impact force after a rotor drop event.

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Guo, Zheng Song, Suo Huai Zhang, Hao Zhang und Hai Ming Wang. „Finite Element Analysis on Tapered Roller with Logarithmic Profile“. Advanced Materials Research 1030-1032 (September 2014): 1189–92. http://dx.doi.org/10.4028/www.scientific.net/amr.1030-1032.1189.

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Taking the type of a double-row tapered roller bearing of a high speed railway passenger coach as research object, the analysis for tapered roller with logarithmic profile has been done. Through the comparison of contact stresses at different crowning values by the finite element software has been done, the best crowning value has been got. There is a certain error between the theory of crowning value and the best crowning value by researching.

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Liu, Jing, RuiKun Pang, YaJun Xu, ShiZhao Ding und QuBo He. „Vibration analysis of a single row angular contact ball bearing with the coupling errors including the surface roundness and waviness“. Science China Technological Sciences 63, Nr. 6 (26.04.2020): 943–52. http://dx.doi.org/10.1007/s11431-019-1493-7.

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30

Xia, Xintao, Shujing Dong, Liming Sun und Tianju Chen. „Load Calculation and Design of Roller Crowning of Truck Hub Bearing“. Open Mechanical Engineering Journal 9, Nr. 1 (26.02.2015): 106–10. http://dx.doi.org/10.2174/1874155x01509010106.

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Double-row tapered roller bearing 353112 is used in trucks, and the external load and pressure distribution of the bearing are calculated combining with the specific operating conditions. Tapered roller bearings typically employ roller profile modification to equalize the load distribution, minimizing the stress concentration at the roller ends. Doing FEA (finite element analysis) on the contact stress with the changing roller crowning between roller and races, the appropriate roller profile and the crown drop of roller can be achieved. Finally the best control equation of roller crowning is obtained. It has important guiding significance for the improvement of roller crowning design of truck hub bearings.

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Jingyang, Zheng, Ji Jinchen, Yin Shan und Tong Van Canh. „The Load Distribution of the Main Shaft Bearing Considering Combined Load and Misalignment in a Floating Direct-Drive Wind Turbine“. E3S Web of Conferences 64 (2018): 07009. http://dx.doi.org/10.1051/e3sconf/20186407009.

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The main shaft tapered double-inner ring bearing (TDIRB) of floating direct-drive wind turbine system (FDDWT) is one of the most critical components in FDDWT, and its failure accounts for a large proportion of wind turbine malfunctions and faults. Over the past decades, a significant number of methods have been proposed to calculate the contact load distribution along the roller length in TDIRB, since the contact load distribution of roller is the key factor of fatigue life of TDIRB. Most of methods, however, neglected the misalignment of inner ring with respect to outer ring and friction force. In this paper, with the help of comprehensive and accurate quasi-static mathematical method, the contact load distribution of internal loads in TDIRB are analysed by considering the effects of combined loads, angular misalignment and friction force at different wind speeds for FDDWT. The simulation results show that the amount of combined load has an apparent effect on the contact load distribution along the TDIRB raceways and flanges in both rows. Furthermore, the slight change of tilted misalignment has a great influence on the contact load distribution. In addition, the slight angular misalignment easily produces noncontact zone for the bearing raceway in both rows, which is significantly disadvantage for the external load uniform transmitting to each roller.

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Petersen, Dick, Carl Howard, Nader Sawalhi, Alireza Moazen Ahmadi und Sarabjeet Singh. „Analysis of bearing stiffness variations, contact forces and vibrations in radially loaded double row rolling element bearings with raceway defects“. Mechanical Systems and Signal Processing 50-51 (Januar 2015): 139–60. http://dx.doi.org/10.1016/j.ymssp.2014.04.014.

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33

Visintin, M., und H. Barbeau. „The Effects of Body Weight Support on the Locomotor Pattern of Spastic Paretic Patients“. Canadian Journal of Neurological Sciences / Journal Canadien des Sciences Neurologiques 16, Nr. 3 (August 1989): 315–25. http://dx.doi.org/10.1017/s0317167100029152.

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ABSTRACT:The effects of mechanically supporting a percentage of body weight on the gait pattern of spastic paretic subjects during treadmill locomotion was investigated. Electromyographic (EMG), joint angular displacement and temporal distance data were simultaneously recorded while 7 spastic paretic subjects walked at 0% and 40% body weight support (BWS) at their maximal comfortable treadmill speed. Forty percent BWS produced a general decrease in EMG mean burst amplitude for the lower limb muscles investigated with instances of more appropriate EMG timing in relation to the gait cycle. The joint angular displacement data at 40% BWS revealed straighter trunk and knee alignment during the weight bearing phase especially at initial foot-floor contact and midstance. An increase in single limb support time and a decrease in percentage total double support time were evident at 40% BWS. An increase in stride length and maximum comfortable walking speed was also seen with BWS. The use of BWS during treadmill locomotion as a therapeutic approach to retrain gait in neurologically impaired patients is discussed.

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Liang, Junshuai, Ning Li, Jingyu Zhai, BaoGang Wen, Qingkai Han und Changxin Yu. „Study on bearing stiffness characteristics with residual stress in carburized layer“. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 21.09.2020, 095440622096079. http://dx.doi.org/10.1177/0954406220960793.

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In this study, a layering method of carburized ring is presented. A finite element (FE) model for analyzing bearing stiffness characteristics is established considering the residual stress in the carburized layer. The residual stress in the carburized layer of a double-row conical roller bearing is tested and the influence of the distribution of residual stress in carburized layer on the bearing stiffness is investigated. Results show that the residual stress in the carburized layer increases the contact stiffness of the bearing by 5% in the low-load zone and 3% in the high-load zone. The radial stiffness of the bearing is increased by 5% in the low-load zone and 3% in the high-load zone. The axial stiffness is increased by 6%, and the angular stiffness increased by 4%. The larger the thickness of the carburized layer, the greater the residual compressive stress in the carburized layer, the deeper the position of the maximum residual stresses in the carburized layer will lead to the greater stiffness of the bearing.

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Haiting, Lv. „Characteristics and Mechanical Properties of Rolling-Element Bearings“. International Journal of Vehicle Structures and Systems 8, Nr. 3 (13.11.2016). http://dx.doi.org/10.4273/ijvss.8.3.08.

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Large rolling bearings are mainly used in occasions of low speed and heavy load due to its desirable properties such as large-scale structure and high bearing capacity. Currently, the research emphases of large rolling bearings are focussed on the load distribution, load carrying capacity, fatigue life and structure optimization. Bearings used in heavy vehicles belong to large bearings, whose reliability is also very important. In this paper, the characteristics of the structures of four point angular contact ball bearings and three row cylindrical roller bearing are analyzed. Finite element (FE) model is used to simulate the load distribution and angle variation in the actual working process of a large rolling bearing. In order to analyze the impact of the constraints, the stiffness and the local hard point of the supporting structure on the mechanical properties of large rolling bearings, a series of simplified FE models of large rolling bearing with different constraints and supporting structure has been carried out.

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Khakse, Prashant Govindrao, und Vikas M. Phalle. „Analytical Study of Non-Recessed Conical Hole Entry Hybrid/Hydrostatic Journal Bearing with Constant Flow Valve Restrictor“. Tribologia - Finnish Journal of Tribology 37, Nr. 3−4 (11.12.2020). http://dx.doi.org/10.30678/fjt.88768.

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The present work studies the analysis of a non recessed hole entry conical hybrid/hydrostatic journal bearing adjusted for constant flow valve (CFV) restriction. The paper provides effectiveness between the conical bearings with hole entry operating in hybrid and hydrostatic mode. The Reynolds formulae, for the flow of fluid through the mating surfaces of a conical journal and bearing, are numerically worked out in both the modes considering the finite element analysis (FEA) and the necessary boundary preconditions. Holes in double row are marked on conical bearing circumference to accommodate the CFV restrictors, the angular distance between two holes are 30o apart from the apex. Qualitative features of the conical journal bearing system with hole entry have been elaborated to analyze bearing performance for radial load variation Wr = 0.25-2. Numerical results obtained from the present study indicate that load carrying capacity of conical bearing, operating in hydrostatic mode, is enhanced by the maximum pressure, direct fluid film damping and direct film stiffness coefficients vis-a-vis corresponding hybrid mode.

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Brouwer, Matthew D., und Farshid Sadeghi. „Investigation of Turbocharger Dynamics Using a Combined Explicit Finite and Discrete Element Method Rotor–Cartridge Model“. Journal of Tribology 139, Nr. 1 (20.07.2016). http://dx.doi.org/10.1115/1.4033101.

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The objectives of this investigation were to develop a coupled dynamic model for turbocharger ball bearing rotor systems, correlate the simulated shaft motion with experimental results, and analyze the corresponding bearing dynamics. A high-speed turbocharger test rig was designed and developed in order to measure the dynamic response of a rotor under various operating conditions. Displacement sensors were used to record shaft motion over a range of operating speeds. To achieve the objectives of the analytical investigation, a discrete element angular contact ball bearing cartridge model was coupled with an explicit finite element shaft to simulate the dynamics of the turbocharger test rig. The bearing cartridge consists of a common outer ring, a pair of split inner races, and a row of balls on each end of the cartridge. The dynamic cartridge model utilizes the discrete element method in which each of the bearing components (i.e., races, balls, and cages) has six degrees-of-freedom. The rotor is modeled using the explicit finite element method. The cartridge and rotor models are coupled such that the motion of the flexible rotor is transmitted to the inner races of the cartridge with the corresponding reaction forces and moments from the bearings being applied to the rotor. The coupled rotor–cartridge model was used to investigate the shaft motion and bearing dynamics as the system traverses critical speeds. A comparison of the analytical and experimental shaft motion results resulted in minimal correlation but showed similarity through the critical speeds. The cartridge model allowed for thorough investigation of bearing component dynamics. Effects of ball material properties were found to have a significant impact on turbocharger rotor and bearing dynamics.

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Maia Dias, Carlos, Sérgio B. Gonçalves, António Completo, Martina Tognini, Manuel Ribeiro da Silva, Jorge Mineiro, Francisco Curate, Frederico Ferreira und João Folgado. „Why are tapes better than wires in knotless rotator cuff repairs? An evaluation of force, pressure and contact area in a tendon bone unit mechanical model“. Journal of Experimental Orthopaedics 8, Nr. 1 (03.02.2021). http://dx.doi.org/10.1186/s40634-020-00321-y.

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AbstractPurposeKnotless repairs have demonstrated encouraging performance regarding retear rate reduction, but literature aiming at identifying the specific variables responsible for these results is scarce and conflictive.The purpose of this paper was to evaluate the effect of the material (tape or wire suture) and medial tendon passage (single or double passage) on the contact force, pressure and area at the tendon bone interface in order to identify the key factors responsible for this repairs´ success.MethodsA specific knotless transosseous equivalent cuff repair was simulated using 2 tape or suture wire loaded medial anchors and 2 lateral anchors, with controlled lateral suture limb tension. The repair was performed in a previously validated sawbones® mechanical model. Testing analyzed force, pressure and area in a predetermined and constant size “repair box” using a Tekscan® sensor, as well as peak force and pressure, force applied by specific sutures and force variation along the repair box.ResultsTapes generate lower contact force and pressure and double medial passage at the medial tendon is associated with higher contact area. Suture wires generate higher peak force and pressure on the repair and higher mean force in their tendon path and at the medial bearing row. Force values decrease from medial to lateral and from posterior to anterior independently of the material or medial passage.ConclusionContrary to most biomechanical literature, suture tape use lowers the pressure and force applied at the tendon bone junction, while higher number of suture passage points medially increases the area of contact. These findings may explain the superior clinical results obtained with the use uf suture tapes because its smaller compressive effect over the tendon may create a better perfusion environment healing while maintaining adequate biomechanical stability.

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