scholarly journals Fluid Characteristics Analysis of the Lubricating Oil Film and the Wear Experiment Investigation of the Sliding Bearing

Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 67
Author(s):  
Fengming Du ◽  
Changduo Chen ◽  
Kaiguang Zhang
Keyword(s):  
Lubricating Oil ◽  
Sliding Bearings ◽  
Sliding Bearing ◽  
Oil Film ◽  
Cavitation Effect ◽  
Characteristics Analysis ◽  
Key Factor ◽  
Wear Tests ◽  
Fluid Characteristics ◽  
Oil Film Pressure

The sliding bearing is an important component in machines. The characteristics of the oil film fluid of the sliding bearing is the key factor affecting lubrication, which will affect the wear and reliability of the sliding bearing. Herein, the lubricating oil of the sliding bearing is studied, the oil film flow model considering the cavitation effect is established, the pressure and temperature distribution of the oil film under different rotational speeds is explored, and its influence on oil film pressure and temperature are analyzed. Furthermore, wear tests are carried out to measure the wear amount of the bearing bush under different rotational speeds, and the influence of the fluid characteristics of the lubricating oil film on bearing wear is explored. The simulation and experimental study in this paper can provide a reference for the design of sliding bearings.

Oil Film Properties of Three Oil Wedge Sliding Bearing and its Effect to the Rotor Stability

2012 ◽  
Vol 614-615 ◽  
pp. 469-474
Author(s):  
Ai Ping Zhang ◽  
Sheng Qiang Lin
Keyword(s):  
Film Thickness ◽  
Navier Stokes ◽  
Film Properties ◽  
Navier Stokes Equation ◽  
Sliding Bearing ◽  
Film Pressure ◽  
Oil Film ◽  
Wedge Sliding ◽  
Oil Film Pressure ◽  
Pressure Characteristics

Calculating navier-stokes equation to study oil film pressure characteristics of three oil wedge bearing by using CFD software. Studied how to the three oil wedge sliding bearing effect on rotor stability, and analyzing oil film pressure characteristics of three oil wedge sliding bearing and cylindrical bearing. The results showed that three oil wedge bearing is much more stable than the cylindrical bearing, it is more advantageous to the running rotor and unit at stable working than the cylindrical bearing in the same oil film thickness and inlet pressure.

A Review of the Research on the Influencing Factors of Lubrication Performance for Sliding Bearings

2021 ◽  
Vol 16 ◽  
Author(s):  
Xiaodong Yu ◽  
Shiwei Zhan ◽  
Dianbin Huang ◽  
Fan Sun ◽  
Fakun Wang ◽  
...  
Keyword(s):  
Influencing Factors ◽  
High Speed ◽  
Sliding Friction ◽  
Working Environment ◽  
Research Progress ◽  
Lubricating Oil ◽  
Stable Operation ◽  
Sliding Bearings ◽  
Sliding Bearing ◽  
Lubrication Performance

Background: Sliding bearing is a kind of bearing that works under sliding friction, which has the characteristics of stable operation, safety and reliability and noiseless. With the technological progress of the machinery industry, modern machinery and equipment is developing in the direction of high speed and heavy load, its power is getting higher and higher, and the working environment is getting worse, so plain bearings are more and more widely used. Objective: In order to improve the lubricating performance of sliding bearings, the influencing factors of lubricating performance of sliding bearings are summarized and commented. Methods: The research progress and achievements at home and abroad are summarized from three aspects: influencing factors of lubrication performance of radial sliding bearings, thrust sliding bearings and influencing factors of lubricating oil on lubrication performance of sliding bearings, which provides reference for the future development of sliding bearings. Results: The study discusses the experimental method, simulation process and experimental results of the factors affecting the lubrication performance of sliding bearing. Conclusion: The texture, deformation, surface morphology of oil cavity, eccentric load and flow state of sliding bearings all affect the lubricating performance of sliding bearings, and lubricating oil also affects the lubricating performance of sliding bearings.

Analysis of EHL Line Contact in Rapid Braking Motion

2013 ◽  
Vol 318 ◽  
pp. 220-224
Author(s):  
Li Jun Du ◽  
Yao Yao Hong ◽  
She Miao Qi
Keyword(s):  
Elastohydrodynamic Lubrication ◽  
Constant Load ◽  
Lubricating Oil ◽  
Line Contact ◽  
Transient Effects ◽  
Film Pressure ◽  
Oil Film ◽  
Braking Process ◽  
Almost All ◽  
Oil Film Pressure

As is well known, almost all the machines need to start and brake. In this process, the lubrication state of their parts changes instantaneously. In this paper, an isothermal study for the line contact elastohydrodynamic lubrication (EHL), which is in rapid braking process and under a constant load, is carried out by using a simplified multigrid method. Numerical results indicate that the oil film thickness decreases and the oil film pressure increases with the decrease of the speed during the process of rapid braking. The oil film shrinks quickly and the oil entrapment occurs when the speed reduces to a certain range. Simultaneously, the distribution of oil film pressure tends to the central lubrication area. The size of the oil entrapment area and the changes of the oil film pressure are closely related to the braking time and the initial speed, which reflects the transient effects of the lubricating oil film.

Cavitation Bubble Dynamics Induced by Hydrodynamic Pressure Oil Film in Ultrasonic Vibration Honing

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Ce Guo ◽  
XiJing Zhu ◽  
Jia Liu ◽  
Dan Zhang
Keyword(s):  
Ultrasonic Vibration ◽  
Cavitation Bubble ◽  
Bubble Dynamics ◽  
Prediction Method ◽  
Hydrodynamic Pressure ◽  
Ultrasonic Frequency ◽  
Film Pressure ◽  
Oil Film ◽  
Cavitation Effect ◽  
Oil Film Pressure

During ultrasonic vibration honing (UVH), a thin hydrodynamic oil film formed can seriously affect the cavitation effect in the grinding fluid, but the mechanism is still unclear now. Based on the hydrodynamics theory, a revised cavitation bubble model with oil film pressure is developed, and it has been calculated by the four-order Runge–Kutta method. The calculation results show that the oil film pressure under UVH is a positive–negative alternant pulse pressure, and it can induce the secondary expansion of the bubble, leading to double microjets during the process of the bubble collapsing. The effects of ultrasonic amplitude, ultrasonic frequency, oil film height, and reciprocation speed of the honing stone on the bubble dynamics are discussed. With the increase of ultrasonic amplitude, the amplitude of the bubble expansion is increased, and the oscillation interval is extended. As increasing normalized oil film height, the variation of the bubble first expansion is slight, while the amplitude of the bubble secondary expansion is reduced and the oscillation interval is also shortened. The main effect of ultrasonic frequency and reciprocation speed of the honing stone on the bubble dynamics is connected with the secondary bubble expansion. The bubble secondary expansion is decreased with the increasing reciprocation speed of the honing stone, ultrasonic frequency, and oil film height. The results of the simulations are consistent with the surface roughness measurements well, which provides a theoretical prediction method of cavitation bubbles control.

Influence of interface slip on the surface frictional force of texturing sliding bearing

2019 ◽  
Vol 72 (6) ◽  
pp. 735-742
Author(s):  
Yuanfang Zhao ◽  
Yang Jianxi
Keyword(s):  
Friction Force ◽  
Optimization Design ◽  
Friction Reduction ◽  
Sliding Bearings ◽  
Sliding Bearing ◽  
Content Type ◽  
Oil Film ◽  
Friction Resistance ◽  
Slip Conditions ◽  
Interface Slip

Purpose The purpose of this paper is to explore the sensitive parameters affecting the friction resistance of sliding bearings under different interface slip conditions and the influence of the texture position of circular pits on the friction force of sliding bearings. Design/methodology/approach Based on the mechanical equilibrium equation and Newton's viscous fluid mechanics formula and wedge oil film model, the calculation model of sliding bearing friction resistance under interface slip state is established, and the influence of interface slip on friction resistance under different slip conditions is analyzed by means of ANSYS. Friction simulation model of circular pit textured journal bearing under different interface slip conditions. Findings The friction resistance of bearings is mainly determined by journal linear velocity, oil film slip ratio, pressure of inlet and outlet of bearings, oil film thickness and bearing capacity. When both the upper and lower surfaces of the oil film slip, the friction resistance decreases significantly, which is only 4-17 per cent of that without slip. And the friction force of the texture model of circular pit at the exit is better than that at the entrance and the middle of the pit. Originality/value Relevant research results will lay a new theoretical foundation for friction reduction and optimization design of sliding bearings.

Research on Load-Carrying Performances of Magnetic-Fluid Lubrication for Mill Oil-Film Bearing

2013 ◽  
Vol 712-715 ◽  
pp. 356-359
Author(s):  
Jian Mei Wang ◽  
Qing Xue Huang ◽  
Jian Zhao Sun ◽  
Xun Jie Huang ◽  
Jian Feng Kang
Keyword(s):  
Magnetic Field ◽  
Field Intensity ◽  
Magnetic Fluid ◽  
Magnetic Field Intensity ◽  
Lubricating Oil ◽  
Film Pressure ◽  
Oil Film ◽  
Lubricating Film ◽  
Load Carrying ◽  
Oil Film Pressure

The FEM model of lubricating oil film was built with mill oil-film bearing as the research target, the analysis system of magnetic-fluid lubricating oil film for oil-film bearing was developed. APDL and CEL languages were applied to compile the inner analytical programs, and the combination of VB, ANSYS Mechanical with ANSYS CFX was perfectly realized. Through the numerical simulation of magnetic-fluid lubricating film, the load-carrying performances of oil-film bearing with magnetic-fluid lubrication were analyzed, and the relationship among magnetic field intensity with oil-film pressure and temperature was quantitatively calculated. The numerical results have shown that the magnetic-fluid lubrication has obvious influences on oil-film pressure when magnetic field was applied on oil-film bearing, the lubricating viscosity increases with the magnetic-fluid intensity, and the oil-film pressure and temperature also increase with magnetic-field intensity. However, the increasing increment of oil-film temperature is far lower than that of oil-film pressure. The above conclusions prove that magnetic fluid with proper magnetic field can effectively improve the load-carrying capacity of lubricating oil film and enhances the stability of oil-film pressure. Moreover, the adjustable intelligent oil-film pressure with magnetic field is deduced to be feasible.

The Oil Spill Analysis and Structure Improvement of Marine Sliding Bearing

2014 ◽  
Vol 541-542 ◽  
pp. 549-552
Author(s):  
Guo Fu Hu ◽  
Shi Ping Yang
Keyword(s):  
Oil Spill ◽  
Reference Value ◽  
Structure Design ◽  
Lubricating Oil ◽  
Motor Shaft ◽  
Sliding Bearings ◽  
Sliding Bearing ◽  
Slide Bearing ◽  
Structure Improvement

In view of the problems serious leakage of lubricating oil in the current slide bearing of a ship motor shaft sealing.This paper analyzed the reasons of bearing oil through the work principle of sliding bearing and the sealing structure. And put forward to solve leakage measures, provide a certain reference value for the seal structure design of sliding bearings and other rotation machine .

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