Analysis on Influence of Oil Film Thickness on Temperature Field of Heavy Hydrostatic Bearing in Variable Viscosity Condition

2011 ◽  
Vol 239-242 ◽  
pp. 1418-1421 ◽  
Author(s):  
Yan Qin Zhang ◽  
Xiao Qiu Xu ◽  
Xiao Dong Yang ◽  
Hong Mei Li ◽  
Hui Jiang ◽  
...  
Keyword(s):  
Temperature Field ◽  
Film Thickness ◽  
Temperature Rise ◽  
Variable Viscosity ◽  
Lubricating Oil ◽  
Engineering Practice ◽  
Flow State ◽  
Oil Film ◽  
Hydrostatic Bearing ◽  
Nc Machine

According to the problem of the influence of oil film thickness on temperature rise for heavy hydrostatic thrust bearing during operation， build viscosity-temperature equation of lubricating oil film and mathematics model of oil film temperature rise of heavy hydrostatic bearing with multiple oil pads, simulate the temperature field of hydrostatic bearing with sector cavity under various oil film thickness using FVM(finite volume method), and reveal the influence law of oil film thickness of temperature rise for hydrostatic bearing. The results show that temperature distribution of hydrostatic bearing is much the same under various oil film thicknesses, but the influence of oil film thickness of temperature rise for hydrostatic bearing is greater. The results of numerical calculations actually response flow state inside hydrostatic bearing ，offer theoretical foundation for the design of hydrostatic bearing in engineering practice, and have important significance in improving operation stability of NC machine.

scholarly journals Transient temperature field analysis of variable viscosity RTHSB with a special structural cavity

2020 ◽  
Vol 12 (10) ◽  
pp. 168781402096505
Author(s):  
Jiafu Ruan ◽  
Xigui Wang ◽  
ShuE Ji ◽  
Yongmei Wang ◽  
Siyuan An
Keyword(s):  
Temperature Field ◽  
Film Thickness ◽  
Dynamic Simulation ◽  
Temperature Rise ◽  
Variable Viscosity ◽  
Operating Conditions ◽  
Lubricating Oil ◽  
Transient Temperature ◽  
Oil Film ◽  
Instantaneous Temperature

A radial thrust hydrodynamic sliding bearing (RTHSB) with special shaped cavity had been designed. Taking the instantaneous temperature rise characteristics of RTHSB as an analysis object, considering the influence of inlet lubricating oil velocity and transmission shaft speed, a dynamic simulation method of variable viscosity temperature field is proposed, and the mathematical model of instantaneous temperature rise of time-varying oil film is constructed. The correlation equation between instantaneous temperature rise and oil film variable viscosity is analyzed, the lubricating performance of a special-shaped cavity with variable thickness of the oil film considering real-time full operating conditions is revealed, and the alternating transient laws of oil film thickness with variable viscosity and its instantaneous temperature rise for no-load, heavy-load, and different rotating speeds are studied. It is obtained that the higher temperature area of profiled shaped cavity on reverse flow side extends to oil seal side with increase of rotating speed. The dynamic simulation of variable viscosity of RTHSB with different film thickness is simulated by using FLUENT software and the trend of transient film temperature field distribution of in special-shaped cavity is evaluated. The rationality of the mechanism analysis and numerical simulation results in this paper has been verified.

Research on the oil film temperature field of hydrostatic bearing with variable viscosity dynamic simulation and experiment

2019 ◽  
Vol 233 (11) ◽  
pp. 1763-1772
Author(s):  
Yan-Qin Zhang ◽  
Ji-Chang Sun ◽  
Peng-Rui Kong ◽  
Xiang-Bin Kong ◽  
Xiao-Dong Yu
Keyword(s):  
High Temperature ◽  
Film Thickness ◽  
Dynamic Simulation ◽  
Temperature Region ◽  
Temperature Rise ◽  
Variable Viscosity ◽  
High Temperature Region ◽  
Counter Flow ◽  
Oil Film ◽  
Hydrostatic Bearing

In order to improve the lubrication performance of the double-rectangular cavity hydrostatic thrust bearing, this paper selects the temperature rise characteristics of hydrostatic bearing as the research object under the conditions of changing oil film thickness and different working conditions. Using the dynamic mesh method with variable viscosity dynamic simulation, the changing temperature rise curves under different inlet flow velocities and rotating speeds are obtained. This paper obtains the changing laws of oil film thickness and temperature under the hydrostatic bearing running in no-load, load 2.5 t, load 10 t and the rotating speeds of 40 r/min, 60 r/min and 80 r/min. Under the low rotating speed, the high temperature region in the oil cavity mainly concentrates on the counter flow side. With the increase of working speed, the high temperature region on the counter flow side expands to the oil seal side obviously. When the oil film thickness was in the range of 0.04 mm to 0.07 mm, the temperature of oil seal edge increased with the increase of the inlet flow velocity. Using the FLUENT software, the variable viscosity simulation of hydrostatic bearing is carried out under different oil film thickness, and the temperature distribution of oil cavity is obtained. Finally, the correctness of theoretical analysis and simulation are verified by conducting experiment.

Application of dynamic mesh technology in the oil film flow simulation for hydrostatic bearing

2019 ◽  
Vol 71 (1) ◽  
pp. 146-153
Author(s):  
Yanqin Zhang ◽  
Zhiquan Zhang ◽  
Xiangbin Kong ◽  
Rui Li ◽  
Hui Jiang
Keyword(s):  
Film Thickness ◽  
Flow Velocity ◽  
Manufacturing Industry ◽  
Dynamic Mesh ◽  
Lubricating Oil ◽  
Thickness Variation ◽  
Content Type ◽  
Oil Film ◽  
Rotating Speed ◽  
Hydrostatic Bearing

Purpose The purpose of this paper was to obtain the lubrication characteristics of heavy hydrostatic bearing in heavy equipment manufacturing industry through theoretical analysis and numerical simulation. Design/methodology/approach This paper discusses the influence of oil film thickness variation on velocity field, outlet-L and outlet-R flow velocity under the hydrostatic bearing running in no-load 0 N, load 400 KN, full load 1,500 KN and rotating speeds of 10 r/min, 20 r/min, 30 r/min, 40 r/min, 50 r/min and 60 r/min, by using dynamic mesh technology and FLUENT software. Findings When the working table rotates clockwise, in the change process of oil film thickness, the fluid flow pattern of the lubricating oil at the edge of the sealing oil is the rule of laminar flow, and the oil cavity has a vortex. The outlet-R flow velocity becomes higher and higher by increasing the bearing load and working table speed, and the flow velocity increases with the decrease in oil film thickness; the outlet-L flow velocity increases with the decrease in oil film thickness under low rotating speed (less than 10 r/min) condition and decreases with the decrease of oil film thickness under high rotating speed (more than 60 r/min) condition. Originality/value The influence of the oil film thickness on the flow state distribution of the oil film was analyzed under different working conditions, and the influence rules of oil film thickness on the flow velocity of hydrostatic bearing oil pad was obtained by using dynamic mesh technology.

scholarly journals Flow-Heat-Solid Coupling Thermal Deformation Analysis of Hydrostatic Spindle under Viscosity Temperature Effect

2021 ◽  
Author(s):  
Dongju Chen ◽  
Xuan Zhang
Keyword(s):  
Temperature Field ◽  
Temperature Effect ◽  
Thermal Deformation ◽  
Maximum Error ◽  
Error Rates ◽  
Lubricating Oil ◽  
Deformation Analysis ◽  
Oil Film ◽  
Hydrostatic Bearing ◽  
Spindle Shaft

Abstract The hydrostatic bearing oil film plays a key role in supporting and lubricating. As the speed increases, the temperature of the lubricating oil increases and the viscosity decreases. As a result, the bearing capacity of the oil film is reduced, which affects the motion accuracy of the hydrostatic bearing. In this paper, the simulation and analysis of the temperature rise of the hydrostatic bearing oil film under the constant viscosity and the viscosity-temperature effect are performed respectively. Then, based on the fluid-heat-solid coupling analysis theory, the temperature field of the hydrostatic bearing and the thermal deformation of the spindle shaft with and without the viscosity-temperature effect are analyzed separately. The temperature field of the shaft and the thermal deformation of the spindle shaft are analyzed separately. Finally, the bearing temperature and shaft deformation are compared with the experimental values for error analysis. It is found that the error rate is smaller when the viscosity-temperature effect is considered. Considering the viscosity-temperature effect, the maximum error rates of the temperature of the radial and thrust bearing bushes are 11.05% and 7.82%, and the maximum error rates of the thermal deformation of the spindle shaft in the axial and radial directions are 12.03% and 18.57%.

Research on Hydrostatic Supporting Temperature-Rise of Heavy NC Machine Tool

2013 ◽  
Vol 274 ◽  
pp. 132-135 ◽  
Author(s):  
Yan Qin Zhang ◽  
Rui Li ◽  
Chun Xi Dai ◽  
Jun Peng Shao ◽  
Xiao Dong Yang ◽  
...  
Keyword(s):  
Temperature Field ◽  
Machine Tool ◽  
Optimization Design ◽  
Thrust Bearing ◽  
Effective Control ◽  
Fluid Temperature ◽  
Oil Film ◽  
Hydrostatic Bearing ◽  
Nc Machine Tool ◽  
Nc Machine

With heavy NC machine tool is widely used in many oil pad round guide hydrostatic bearing as the research object, in the under condition of variable viscosity, establish oil film viscosity-temperature equation. Adopt finite volume method, simulation the hydrostatic bearing internal fluid temperature field under different flow rates on the speed of 6R / min. Numerical simulation hydrostatic thrust bearing oil film temperature field, can find a general high temperature region, and then take effective control temperature. It can achieve the hydrostatic thrust bearing oil film temperature field prediction for engineering practical oil chamber structure, offer the theoretical foundation for optimization design.

Temperature Field of Hydrostatic Supporting Disk in Different Viscosity and Rotational Speed

2013 ◽  
Vol 274 ◽  
pp. 124-127
Author(s):  
Yan Qin Zhang ◽  
Rui Li ◽  
Chun Xi Dai ◽  
Jun Peng Shao ◽  
Xiao Dong Yang ◽  
...  
Keyword(s):  
Temperature Field ◽  
Machine Tools ◽  
Variable Viscosity ◽  
Great Influence ◽  
Structure Design ◽  
Oil Film ◽  
Hydrostatic Bearing ◽  
Volume Method ◽  
Bearing Structure ◽  
Important Significance

With heavy hydrostatic bearing as the research object, establish oil film viscosity-temperature equation. Adopt finite volume method, respectively calculates the oil film temperature field under different rotate velocity in Invariant viscosity and variable viscosity, revealing the oil film temperature arise influence rule of hydrostatic bearing on the viscosity and rotate velocity. The results show that the viscosity and rotate velocity have a great influence on the hydrostatic bearing oil film temperature rise, but the effect regularity varied. The calculated results that provide a theoretical basis for the hydrostatic bearing structure design and bearing deformation calculation, and have very important significance on improve the reliability and precision of the whole machine tools.

Hot oil carrying characteristic about hydrostatic bearing oil film of heavy vertical lathe in high speed

2019 ◽  
Vol 71 (1) ◽  
pp. 126-132
Author(s):  
Yanqin Zhang ◽  
Pengrui Kong ◽  
Yanan Feng ◽  
Lili Guo
Keyword(s):  
High Speed ◽  
Variable Viscosity ◽  
Load Condition ◽  
Cnc Machine Tools ◽  
Engineering Practice ◽  
Cnc Machine ◽  
Content Type ◽  
Oil Film ◽  
Hydrostatic Bearing ◽  
Volume Method

Purpose To investigate the effects of hot oil carrying (HOC), the purpose of this paper is to present a new calculation method of oil film temperature which takes the effects into account and defines the factor of HOC. Design/methodology/approach Based on finite volume method, the paper studied the temperature characteristics in high speed and the condition of variable viscosity from the temperature field and flow field of the film, and the thermal rule of HOC is revealed. The theoretical values are in good agreement with the experimental results. Findings The results show that, for this structure of hydrostatic bearing, the phenomenon of HOC does not occur until the work speed is more than 10 r/min under any load condition. And it always happens in the total range of load, from 0 to 320 kN, when the speed is over 60 r/min. Moreover, the film temperature increases sharply, when the phenomenon happens in high speed, and the influence of the speed is greater than the effect of load on the temperature rise. Originality/value The results would help to increase the speed of CNC machine tools and the design on structure of the bearing in engineering practice.

Study on oil starvation at the oil seal edge of the oil film of hydrostatic bearing with double rectangular cavity

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Shiqian Ni ◽  
Yanqin Zhang ◽  
Zhen Quan
Keyword(s):  
Temperature Rise ◽  
Friction Pair ◽  
Operating Conditions ◽  
Rectangular Cavity ◽  
Lubricating Oil ◽  
Heat Accumulation ◽  
Content Type ◽  
Oil Film ◽  
Hydrostatic Bearing ◽  
Side Flow

Purpose When the clearance oil film of hydrostatic bearing friction pair is in critical lubrication state, the phenomenon of zero flow of local lubricating oil will aggravate the oil film temperature rise, which needs to be solved. Design/methodology/approach In this paper, the critical lubrication parameter equation and the oil film temperature rise mathematical model are derived for the new type q1-205 double rectangular cavity hydrostatic bearing. Based on a combination of theoretical analysis, simulation and experimental verification, this paper analyzes the flow characteristics and temperature rise characteristics of the lubricating oil when the hydrostatic bearing is in a critical lubrication state under different operating conditions and finally obtains the critical lubrication state of the oil film. Findings This study found that the numerical simulations and the derived formulas agree with the results. When the oil film is in critical lubrication, the cross-section side flow of the oil side is almost zero. The heat cannot be taken away in time, resulting in the local temperature rise of the oil film, which causes serious heat accumulation. Originality/value It is concluded that the operating condition parameters corresponding to the critical lubrication state provide a theoretical basis for the selection of actual hydrostatic bearing operating conditions, which is of great scientific significance.

Numerical Modeling of Unsteady Oil Film Motion Characteristics in Bearing Chambers

2015 ◽  
Vol 32 (3) ◽  
Author(s):  
Jingyu Zhao ◽  
Zhenxia Liu ◽  
Yaguo Lu ◽  
Jianping Hu
Keyword(s):  
Film Thickness ◽  
Theoretical Study ◽  
Rotation Speed ◽  
Three Dimensional ◽  
Lubricating Oil ◽  
Flow State ◽  
Oil Film ◽  
Model Based ◽  
Oil Flow ◽  
Motion Characteristics

AbstractTo obtain motion characteristics of the lubricating oil film on the aero-engine bearing chamber wall, a complete mathematical model based on theoretical study to solve three-dimensional unsteady oil film motion was established. On the basis of verifying the rationality of the computational model, the variations of the oil film thickness, velocity and temperature with the rotation speed and lubricating oil flow were analyzed and studied. The numerical results show that the following: In the stable oil film flow state, the oil film thickness shows a decreasing trend with increase in rotation speed and an increasing trend with increase in the lubricating oil flow. Particularly, comparison with the experimental work shows that the proposed numerical model based on theoretical study to solve unsteady oil film motion is a valuable technical means for the study of oil film movement mechanism and the design of actual bearing chamber.

Thermal elastohydrodynamic lubrication characteristics and optimisation of the ball-type tripod universal joint

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Fuqin Yang ◽  
Xiaojie Han ◽  
Mingqing Si
Keyword(s):  
Elastic Modulus ◽  
Film Thickness ◽  
Temperature Rise ◽  
Elastohydrodynamic Lubrication ◽  
Lubricating Oil ◽  
Universal Joint ◽  
Oil Viscosity ◽  
Content Type ◽  
Oil Film ◽  
Lubrication Characteristics

Purpose This paper aims to study the influence of three-column groove shell radius, ball radius, lubricating oil viscosity and elastic modulus on the thermal elastohydrodynamic lubrication (TEHL) characteristics and optimisation of the ball-type tripod universal joint. Design/methodology/approach The point contact TEHL model of the joint was developed, and the multi-grid method was used to solve it. The influence of three-column groove shell radius, ball radius, lubricating oil viscosity and elastic modulus on the lubrication characteristics was analysed. Further, the optimisation of the joint TEHL performance was carried out by the Kriging approximation model combined with the multi-objective particle swarm optimisation (MOPSO) algorithm. Findings The research results show that increasing groove shell radius and ball radius can effectively increase the oil film thickness, and decrease the oil film pressure, as well as the temperature rise. Decreasing elastic modulus can reduce the oil film temperature rise and pressure, and increasing viscosity can effectively increase the oil film thickness. The optimised minimum oil film thickness increases by 33.23% and the optimised maximum oil film pressure and maximum temperature rise decrease by 11.92% and 28.87%, respectively. Furthermore, the relative error of each response output is less than 10%. Originality/value This study applies TEHL theory to the tribological research of the ball-type tripod universal joint, and the joint’s lubrication performance is improved greatly by the Kriging model and MOPSO algorithm, which provides an effective measure to raise the joint’s working efficiency.

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