Influence of Working Parameters on Dynamic Pressure Effect of Heavy Constant Flow Hydrostatic Center Rest

2013 ◽  
Vol 274 ◽  
pp. 82-86
Author(s):  
Bo Wu ◽  
Xiao Dong Yu ◽  
Xue Mei Chang ◽  
Chao Yin
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Pressure Field ◽  
Pressure Effect ◽  
Dynamic Pressure ◽  
Lubricating Oil ◽  
Constant Flow ◽  
Oil Film ◽  
Working Parameters ◽  
Volume Method

In order to increase the working performance of a heavy constant flow hydrostatic center rest, a theoretical study concerning the lubricating oil film dynamic pressure effect of the heavy constant flow hydrostatic center rest is described. The Computational Fluid Dynamics and the Finite Volume Method have been used to compute numerically the static pressure field and the total pressure field of the lubricating oil film. The influences of spindle rotating rate, lubricating oil dynamic viscosity and inlet flow rate on the lubricating oil film dynamic pressure effect of the heavy constant flow hydrostatic center rest were analyzed based on the computational fluid dynamics and lubrication theory, and the influencing laws were revealed. By means of this method, the reasonable data can be provided for reasonably controlling dynamic pressure and structure optimal design of the heavy constant flow hydrostatic center rest.

Simulation on Pressure Field of Gap Oil Film in Constant Flow Hydrostatic Center Frame

2013 ◽  
Vol 427-429 ◽  
pp. 289-292
Author(s):  
Xiao Dong Yu ◽  
Hong Ying Li ◽  
Xiu Li Meng ◽  
Li Tan ◽  
Zhi Qiang Wang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Pressure Field ◽  
Three Dimensional ◽  
Constant Flow ◽  
Cavity Pressure ◽  
Distribution Law ◽  
Simulation Research ◽  
Oil Film ◽  
Simulation Results ◽  
Volume Method

In order to solve the force deformation of the hydrostatic center frame in the heavy type horizontal lathe, a simulation research concerning pressure field of hydrostatic center frame was described. The Finite Volume Method of CFX has been used to compute three-dimensional pressure field of gap fluid between the rotation workpiece and bearing pillow. This research theoretically analyzes the influence of angular velocity on the bearing pressure performance according to lubricating theory and computational fluid dynamics, and it has revealed its pressure distribution law of gap oil film. The simulation results indicate that an improved characteristic will be affected by rotating velocity easily, and oil cavity pressure creases by gradually with rotating velocity enhancing. Through this method, it can provide reasonable data for design, lubrication, experience and force deformation computation for hydrostatic center frame in the heavy type horizontal lathe.

Influence of Oil-Returning Slot on Load Capacity of Heavy Constant Flow Hydrostatic Center Rest

2014 ◽  
Vol 494-495 ◽  
pp. 633-636
Author(s):  
Bo Wu ◽  
Zhi Huang ◽  
Xiao Dong Yu ◽  
Hui Jiang ◽  
Chun Zhou Wang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Load Capacity ◽  
Flow State ◽  
Constant Flow ◽  
Heavy Equipment ◽  
Lubrication Performance ◽  
Oil Flow ◽  
Lubrication Characteristics ◽  
Volume Method

In order to increase load capacity of a heavy constant flow hydrostatic center rest, a theoretical study concerning the lubrication performance of the heavy constant flow hydrostatic center rest is described. The Computational Fluid Dynamics and the Finite Volume Method have been used to compute lubrication characteristics, such as the recess pressure and the oil flow state. The influences of oil-returning slot on the load capacity of the heavy constant flow hydrostatic center rest was analyzed based on the computational fluid dynamics and lubrication theory, and the influencing laws were revealed. Through this method, the reasonable data can be provided for optimal design and lubrication performance improving of the constant flow hydrostatic center rest in the heavy equipment.

Heavy load characteristics of micro-beveled heavy-duty hydrostatic bearing lubricant oil film

2020 ◽  
pp. 135065012092049
Author(s):  
Zhang Yanqin ◽  
Luo Yi ◽  
Ni Shiqian ◽  
Zhang Zhiquan
Keyword(s):  
Compensation Effect ◽  
Dynamic Pressure ◽  
Fluid Velocity ◽  
Lubricating Oil ◽  
Heavy Load ◽  
Oil Film ◽  
Lubricant Oil ◽  
Pressure Compensation ◽  
Volume Method ◽  
The Mathematical Model

This paper is based on the new Q1-205 micro-beveled double rectangular cavity heavy hydrostatic thrust bearing. According to the hydrostatic and dynamic pressure lubrication theory, the mathematical model of the dynamic and static bearing capacity of micro-beveled oil film is established under the conditions of considering the bearing oil supply system and the actual structural of the oil pad. Based on the finite volume method, the lubricating performance of the oil film is numerically simulated under heavy load of 10t, 15t, 20t, 25t and 30t, and the comprehensive influence law of oil cavity pressure, fluid velocity, vorticity and flow rate is revealed under the influence of extreme working conditions such as heavy load. Finally, the oil film pressure field affected by heavy load is tested under certain wedge parameters and rotational speed and verifies the theoretical analysis and simulation. It is found that the experimental and theoretical result of bearing is consistent with each other under heavy load. The dynamic pressure compensation effect of the bearing is better under the wedge oil pad condition. However, under heavy load, the extrusion and heating of lubricating oil are serious, which make the viscosity of lubricating oil drops sharply. In addition, the dynamic pressure effect of wedge oil pad is less affected by load. The compensation effect decreases slightly with the increase of load. The dynamic pressure compensation range of the bearing is 30%–10% under heavy load.

Oil Film State between Friction Pair in Hydro-Viscous Drive

2013 ◽  
Vol 313-314 ◽  
pp. 206-209
Author(s):  
Fang Wei Xie ◽  
Yun Sen Hong ◽  
Gang Zheng ◽  
Shu Meng Wang
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Radial Direction ◽  
Friction Pair ◽  
Dynamic Pressure ◽  
Numerical Results ◽  
Physical Models ◽  
Flow State ◽  
Oil Film ◽  
Film State

In the paper, we research the flow state and the pressure of the oil film between the parallel and the deformed friction pairs to reveal the oil film state between the friction pair in hydro-viscous drive. Firstly, 3D physical models of the oil film were established. Then, the models were solved based on the principle of computational fluid dynamics. We found that the dynamic pressure goes up gradually along the radial direction; at zone with groove the dynamic pressure is higher, and the dynamic pressure between deformed interfaces is lower than that between parallel interfaces. The velocity of the oil film increases along the radial direction, and that between deformed interfaces is higher. The numerical results can provide some theoretic basis for the study of the HVD technology.

Simulation on Supporting Characteristics of Heavy Hydrostatic Thrust Bearing

2012 ◽  
Vol 157-158 ◽  
pp. 94-97 ◽  
Author(s):  
Yan Qin Zhang ◽  
Rui Li ◽  
Chun Xi Dai ◽  
Jun Peng Shao ◽  
Xiao Dong Yu ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Thrust Bearing ◽  
Pressure Field ◽  
Internal Flow ◽  
Engineering Practice ◽  
Rotating Speed ◽  
Hydrostatic Bearing ◽  
Cavity Structure ◽  
Volume Method

The pressure field of the clearance oil film of the hydrostatic bearing in varies velocities was simulated based on Finite Volume Method (FVM) by the software of Computational Fluid Dynamics. In this article, a conclusion could be drawn that the viscosity has great influences on the pressure in the heavy hydrostatic bearing and it cannot be neglected especially in high rotating speed. The results of numerical calculations provide internal flow status inside the bearing, which would help the design of the oil cavity structure of the bearing in engineering practice.

Research on Velocity Field and Dynamic Pressure Effect of Oil Film of Hydrostatic Center Rack

2010 ◽  
Vol 129-131 ◽  
pp. 1119-1123 ◽  
Author(s):  
Jun Peng Shao ◽  
Chao Yin ◽  
Bo Wu ◽  
Zhong Wen Wang ◽  
Zhi Huang ◽  
...  
Keyword(s):  
Velocity Field ◽  
Pressure Field ◽  
Pressure Effect ◽  
Dynamic Pressure ◽  
Spindle Speed ◽  
Engineering Practice ◽  
Element Analysis ◽  
Open Type ◽  
Oil Film ◽  
Simulation Results

Hydrostatic center rack is an open type hydrostatic supporting equipment. In this paper, taking oil film of middle pillow of hydrostatic center rack as the research object, the velocity field, pressure field and dynamic pressure effect are simulated based on CFX finite element analysis software. The velocity distribution, pressure field and the relationship curve between spindle speeds and dynamic pressure are obtained. The simulation results show that there is negative pressure at the entrance of spindle rotation direction. When the spindle speed is less than 360r/min, the dynamic pressure effect is not obvious and at the steady state basically. Above this speed, the dynamic pressure effect increases significantly as the spindle speed rises. The simulation results can reflect the flow law of internal flow field of the middle pillow. It provides a theoretical basis for the structure optimization of hydrostatic center rack and open type radial sliding bearing in engineering practice.

Comparative Study on Pressure Field of Hydrostatic Thrust Bearing with Different Recess Shapes

2014 ◽  
Vol 621 ◽  
pp. 431-436
Author(s):  
Xiao Dong Yu ◽  
Zhi Qiang Wang ◽  
Xiu Li Meng ◽  
Qi Hui Zhou ◽  
Yan Qin Zhang ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Comparative Study ◽  
Thrust Bearing ◽  
Pressure Field ◽  
Three Dimensional ◽  
Distribution Law ◽  
Computational Fluid Dynamics Cfd ◽  
Simulation Results ◽  
Volume Method

A comparative study on pressure field of hydrostatic thrust bearing with sector recess, rectangular recess, ellipse recess and I-shaped recess is carried out in order to solve the deformation of the hydrostatic thrust bearing. The Finite Volume Method has been used to compute three-dimensional pressure field of gap oil film between the rotation worktable and the base. This study theoretically analyzes the influence of recess shape on the bearing pressure characteristic according to Computational Fluid Dynamics (CFD) and lubricating theory. It has revealed its pressure field distribution law. The simulation results indicate that an improved characteristic will be affected by recess shape easily. Through this method, the safety of a hydrostatic thrust bearing with different recesses can be forecasted, and the optimal design of such products can be achieved, so it can provide reasonable data for design, lubrication, and experiment and deformation computation for hydrostatic thrust bearing.

CFD Study of Ship-to-Bank Interaction

2017 ◽  
Vol Vol 159 (A3) ◽  
Author(s):  
Y K Kim ◽  
E Y K Ng
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Pressure Field ◽  
Physical Phenomenon ◽  
Experimental Studies ◽  
Container Ship ◽  
Confined Water ◽  
Water Effect ◽  
Computational Approaches ◽  
Shallow Water Effect

Ship-to-bank interaction is a complex physical phenomenon that involves not only in the asymmetric pressure field near banks or channels but also shallow water effect. Traditionally many experimental studies were carried out in this field. As numerical method is getting popular, there were various computational approaches as well. In this study, flow around a container ship in confined water is investigated with the open source CFD (Computational Fluid Dynamics) toolbox, OpenFOAM. Computations with several bank arrangements and different settings are performed. The OpenFOAM results are also compared to experiment results for validation.

Computational fluid dynamics: a primer for congenital heart disease clinicians

2020 ◽  
Vol 28 (8) ◽  
pp. 520-532
Author(s):  
Rabin Gerrah ◽  
Stephen J Haller
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Congenital Heart Disease ◽  
Blood Flow ◽  
Heart Disease ◽  
Congenital Heart ◽  
The Finite Element Method ◽  
Blood Flow Dynamics ◽  
Clinical Questions ◽  
Volume Method

Computational fluid dynamics has become an important tool for studying blood flow dynamics. As an in-silico collection of methods, computational fluid dynamics is noninvasive and provides numerical values for the most important parameters of blood flow, such as velocity and pressure that are crucial in hemodynamic studies. In this primer, we briefly explain the basic theory and workflow of the two most commonly applied computational fluid dynamics techniques used in the congenital heart disease literature: the finite element method and the finite volume method. We define important terminology and include specific examples of how using these methods can answer important clinical questions in congenital cardiac surgery planning and perioperative patient management.

Simulation on Temperature Field of Gap Oil Film in Constant Flow Hydrostatic Center Frame

2011 ◽  
Vol 121-126 ◽  
pp. 4706-4710
Author(s):  
Yong Hai Li ◽  
Xiu Li Meng ◽  
Xiao Dong Yu ◽  
Bo Wu ◽  
Chun Li Gao ◽  
...  
Keyword(s):  
Temperature Field ◽  
Angular Velocity ◽  
Thermal Deformation ◽  
Three Dimensional ◽  
Constant Flow ◽  
Distribution Law ◽  
Simulation Research ◽  
Oil Film ◽  
Temperature Performance ◽  
Volume Method

In order to solve the thermal deformation of the hydrostatic center frame in the heavy type horizontal lathe, a simulation research concerning temperature field of hydrostatic center frame is described. The Finite Volume Method of CFX has been used to compute three-dimensional temperature field of gap fluid between workpiece and bearing pillow. This research theoretically analyzes the influence of angular velocity on the bearing temperature performance according to lubricating theory and computational fluid dynamics, and it has revealed its temperature distribution law of gap oil film. Results indicate that an improved characteristic will be affected by angular velocity easily, and oil cavity temperature increases by gradually with angular velocity enhancing. Through this method, the safety of a hydrostatic center frame can be forecasted, and the optimal design of such products can be achieved, so it can provide reasonable data for design, lubrication, experience and thermal deformation computation for hydrostatic center frame in the heavy type horizontal lathe.

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