In this paper, the formulas of elasto-hydrodynamic traction coefficients three Chinese aviation lubricating oils, 4109, 4106 and 4050, were obtained by a great number tests. The nonlinear dynamics differential equations high-speed angular contact ball bearing built on basis dynamic theory rolling bearings solved Gear Stiff (GSTIFF) integer algorithm with variable step. impact lubricant coefficient cage’s characteristics in was investigated, Poincaré map used to analyze types oils response...

In this paper, the formulas of elastohydrodynamic traction coefficients four Chinese aviation lubricating oils, namely, 4109, 4106, 4050, and 4010, were obtained by a great number tests. The nonlinear dynamics differential equations high-speed cylindrical roller bearing built on basis dynamic theory rolling bearings solved Hilber–Hughes–Taylor (HHT) integer algorithm with variable step. influence lubricant coefficient cage's behavior was investigated, Poincaré map used to analyze types oils...

With the advancement of industries such as high-speed railways, new energy vehicles, and wind power, bearings are frequently exposed to various electric field environments, leading need for lubricating oil films withstand voltage. One major issues caused by breakdown discharge process film in is generation local instantaneous high temperatures. This temperature rise a key factor contributing problems operating bearings, surface damage contact area, degradation lubrication performance....

The paper mainly studied the temperature rise characteristics of under-race lubricated high-speed angular contact ball bearings under operational conditions from perspective dynamics. steady-state calculation model bearing was established using a thermal network method in consideration influence factor friction power consumption components based on dynamic model. Following this, change were obtained by solving balance equation. Through this process, laws rotation speed, oil supply, and...

In the ultra-low temperature environment, material properties of bearing change, which puts forward higher requirements for dynamic performance cage. The bearings operating in environments commonly use solid lubricants. This study first focused on measuring traction coefficients molybdenum disulfide (MoS2) lubricant a nitrogen atmosphere, and Gupta fitting model is constructed to derive equation. Subsequently, differential equation angular contact ball was established, stability cage...

In this study, a novel dynamic model of ball bearing based on rigid–elastic–liquid (REL) coupling structure considering external load excitation is established, and the response its outer ring under examined. First, differential equation journal motion (i.e. ring) derived Newton’s law, oil film force induced by REL determined using central finite difference method, planar bending theory thin ring, Simpson’s rule. Further, fourth fifth-order variable step length Runge–Kutta method used to...

Purpose The purpose of this paper is to study the influence cage dynamic unbalance on performances in cylindrical roller bearings. Design/methodology/approach analysis model which considering presented, and relationship between stability, slip ratio skew angle investigated. Findings Cage has a great effect stability. an axial excursion affects characteristics greater than that only radial direction. increases with unbalance, especially excursion. non-metal more sensitive metal cage....

Real-time condition monitoring and fault diagnosis of spindle bearings are critical to the normal operation matching machine tool. In this work, considering interference random factors, uncertainty vibration performance maintaining reliability (VPMR) is introduced for tool (MTSB). The maximum entropy method Poisson counting principle combined solve variation probability, so as accurately characterize degradation process optimal state (OVPS) MTSB. dynamic mean calculated using least-squares...

Purpose This study aims to analyze the roller dynamic characteristics and cage whirling of tapered bearing considering tilt skew which provide a theoretical basis for design application bearing. Design/methodology/approach Based on rolling analysis, differential equations are established. Fine integral method predict correct Adams–Bashforth–Moulton multi-step used solve bearings. Findings Friction at flange contact between large is chief factor skew. In comparison cone speed, axial loads...

Purpose The purpose of this study is to investigate the effect roller dynamic unbalance on cage stress. Design/methodology/approach Considering impact unbalance, analysis model high-speed cylindrical bearing established. And then results are used as boundary conditions for finite element and obtain Findings Roller affects contact status between pocket causes overall increase in most significant stress angular direction axis, followed by radial axial directions. Smaller clearance a reasonable...

This study presents a method for measuring the imbalance in small-sized cylindrical roller. The roller was calibrated on built static-pressure-air flotation measurement machine. impact of dynamic characteristics cage were then studied aero-bearing test rig. displacement spectrums with different obtained orbits under various bearing speed and radial load used to evaluate stability. results show that cannot form stable operating state at lower or without unbalanced rollers. balanced rollers...

The traction motor is a crucial component of high-speed electric multiple units, and its operational reliability directly impacted by the temperature increase in bearings. To accurately predict simulate change process bearings during operation, fluid–solid–thermal simulation analysis model grease-lubricated deep groove ball was constructed. This aimed to rise bearing grease flow process, which validated through experiments. results from tests indicate that contact zone between rolling...

This article focuses on the problem of sealing failure in high-speed micro bearings. Based a thermal-stress coupled finite element model, distribution equivalent stress and contact pressure ring influence various factors performance are analyzed. this, Latin Hypercube sampling method, Kriging surrogate model genetic algorithm used to find optimal combination performance. Finally, accuracy method is verified through orthogonal experiments. Research has found that maximum seal 0.59234 MPa, it...

To meet the precision design of bearings on large wind turbine spindles, a crowning method bearing spindles considering flexibility support structure is proposed. Firstly, finite element (FE) model shaft system with flexible constructed by connecting and through constraint equations (CE) multi-point (MPC) algorithms replacing rollers nonlinear spring elements dampers. Then, Newmark integration algorithm used to solve analyze effect structure’s rigidity load distribution bearings. perform...

This study focuses on the rivet early fatigue characteristics in a deep-groove ball bearing cage for transmission system turboprop engine. Nonlinear dynamic differential equations with two-piece were developed. The stress was used to identify failure mechanism of rivets. investigation revealed that by delivering an optimal preload causes two halves have less misalignment and lower stress. fit relationship between bore has significant influence Excessive clearance increases head rivet, while...

Bearings operating in ultra-low-temperature environments are commonly lubricated with solid lubricants. This study first focused on measuring the traction coefficients of molybdenum disulfide (MoS2) lubricant under various working conditions. Based this data, friction power consumption bearings was calculated and analyzed using a dynamic model. Additionally, experimental verification bearing ultra-low temperature conducted. The research findings will serve as foundation for application...

Information such as probability distribution, performance degradation trajectory, and reliability function varies with the service status of rolling bearings, which is difficult to analyze evaluate using traditional theory. Adding equipment operation bearing has become focus current research ensure effective maintenance system, reduce faults, improve quality under condition statistics. So, a mathematical model established by proposing hierarchical maximum entropy Bayesian method (HMEBM),...

In this study, a dynamic model of ball bearing based on rigid-elastic-liquid (REL) coupling structure under unbalanced rotor force is established, and the response characteristics its outer ring external load excitation are examined. Firstly, differential equation journal motion (i.e., ring) derived Newton's law, oil film introduced by REL determined using central finite difference method, plane thin bending theory, Simpson's rule. Further, fourth-and fifth-order variable step length...

Aerospace bearings need to withstand the low-temperature environment of space, which will cause changes in internal lubrication state bearings. This article aims assess traction properties aerospace lubricants under micro-oil droplet (hereinafter referred as ‘micro-oil’) supply conditions, and provide a theoretical basis for studying motion characteristics environment. An experimental study on high-speed bearing was conducted specially designed lubricant characteristic tester. A modified...