...Yu Hou; Xi Wang; Xingyu Li; Rubing Guo; Junqiang Li; Qiang Li The differences in the roller diameters within a roller bearing is unavoidable in practice, which is known as the off-sized effect. The off-sized effect results in the dynamic variation of the load distribution in bearings and further...

...Yiming Han; Petr Sperka; Jing Wang; Ivan Krupka; Martin Hartl; Weimin Li; X. B. Wang; Weimin Liu The influence of the grease-water two-phase emulsion on the bearing track on the film formation has been studied by carrying out optical interferometry experiments on a ball disk test rig to observe...

...Ken Takahashi; Takafumi Nagatomo The calculating method for fatigue life of rolling bearings is based on the theory of Lundberg and Palmgren. The rated life is determined from the ratio of the dynamic load rating of the bearing to the dynamic equivalent load. However, in actual applications...

...Oliver Menck Fatigue life calculation in bearings is an issue that has been the focus of decades of research culminating in national and international standards that are easily applicable to a wide variety of applications. However, almost all research has focused on simple, repetitive operating...

...Michael Dawoud; Stephan Beitler; Hubert Schwarze The rolling element slip of an NU215 cylindrical roller bearing fitted with four cage types was studied under various operating conditions. In comparison, a specially designed full complement bearing with the same principal dimensions was also tested...

...Michael Dawoud; Stephan Beitler; Hubert Schwarze The slip behavior of four cage types was studied for an NU215 cylindrical roller bearing under radial forces lower than the minimum recommended by the manufacturer by performing force, speed, and oil flow ramp tests. In comparison, a specially...

...Michael Dawoud; Stephan Beitler; Hubert Schwarze The set and roller slip of an NU215 cylindrical roller bearing with medium clearance (MC) and tight clearance (TC) classes have been tested and compared to those of extensive clearance (EC) presented in Parts I and II of this publication. A total...

...-darmstadt.de bearings fluid-film lubrication hydrodynamic lubrication hydrostatic lubrication journal bearings rotordynamic seals References [1] Childs , D. W. , 1983 , “ Finite-Length Solutions for Rotordynamic Coefficients of Turbulent Annular Seals ,” ASME J. Lubr...

...–thermal–load coupling model, a 30,205 tapered roller bearing with curved contact is examined by reading the real-time key point temperatures using thermocouple. Finally, the effectiveness of the presented model is verified through experiments and comparison. Figure 1 shows the arbitrary curvilinear...

...Jing Liu; Zidan Xu The heat generated during the bearing working process would greatly affect the working life and stability of bearing and mechanical transmission system. To analyze the heat generation of cylindrical roller bearings (CRBs), a theoretical calculation model of bearing friction...

... the boundary condition for calculation of the raceway’s elastic deformation outside the Hertz contact zone. Since the ball screw only bears the axial load, the displacements of the screw and the nut under the axial load are along the axis of the screw. According to Saint–Venant principle, the elastic...

...Xun Huang; Ge Xu; Shuyun Jiang Journal bearing reaction is usually represented by a set of forces and moments concentrated at a single point. This single point support model cannot be utilized to describe the behavior of fairly long bearing. This technical brief proposes a multiple nodes model...

...Hiroyuki Ohta; Yusuke Ueki This article deals with the expressions of friction force of a four-point contact linear ball bearing with two rows under low-speed operation. First, the slip velocity on a contact area and the equilibrium of moments acting on a ball were theoretically examined...

...Xiao-Yi Wang; Hu-Tian Feng; Chang-Guang Zhou; Zeng-Tao Chen; Jing-Lun Xie Preload, which is widely applied in linear motion ball guide (LMBG) to eliminate clearance and increase stiffness, gradually decreases owing to wear, resulting in the degradation of the load-bearing capability and dynamic...

...Dongil Shin; Junho Suh; Alan B. Palazzolo This paper investigates the journal asymmetric temperature-induced thermal bow vibration of a rotor, as supported by a flexure pivot journal bearing (FPJB). Thermal bow-induced vibration, known as the Morton effect (ME), is caused by non-uniform viscous...

...Luc Houpert; Oliver Menck This article begins by describing standard bearing life models in continuous rotation before going on to explain how the bearing life can be calculated for roller and ball bearings in oscillatory applications. An oscillation factor a osc is introduced, which accounts...

... fatigue life equation was constructed from this investigation’s RCF simulations to evaluate the stochastic RCF performance, given grain diameter and contact pressure, of non-conformal contacts. References [1] 2020 , Precedence Research Report on Bearing Market—Global Market Size, Trends Analysis...

...A. Dindar; A. S. Chimanpure; A. Kahraman A tribo-dynamic model of ball bearings is proposed to predict their load-dependent (mechanical) power losses. The model combines (i) a transient, point contact mixed elastohydrodynamic lubrication (EHL) formulation to simulate the mechanics of the load...

...P. Samanta; H. Hirani The present work portrays the latest review of the progressive advances in passive magnetic bearing (PMB) technology. PMB is an old technology with many encouraging properties. However, there are a number of inherent issues with design, analysis, and performance...

...Shuyun Jiang; Pengfei Liu; Xiaohui Lin Water-lubricated hydrodynamic spiral groove bearing is a potential support way for high-speed rotary machine, but the frictional power loss of the bearing will increase with the rotatory speed. Surface texture processing should be an effective technical means...