Simulation on Multi-Oil-Cavity and Multi-Oil-Pad Hydrostatic Bearings

2013 ◽  
Vol 274 ◽  
pp. 274-277 ◽  
Author(s):  
Xiao Qiu Xu ◽  
Jun Peng Shao ◽  
Xiao Dong Yang ◽  
Yan Qin Zhang ◽  
Xiao Dong Yu ◽  
...  
Keyword(s):  
Hydraulic System ◽  
Thrust Bearing ◽  
Three Dimensional ◽  
Structure Design ◽  
Analysis Software ◽  
Hydrostatic Bearing ◽  
Hydrostatic Bearings ◽  
Simulation Results ◽  
Three Dimensional Models ◽  
Volume Method

Taking multi-oil-cavity and multi-oil-pad hydrostatic bearings as studied projects, firstly make brief instructions for structure characteristics and working principal of hydraulic system; Then, build three-dimensional models of multi-oil-cavity and multi-oil-pad hydrostatic bearings respectively. Adopting finite volume method, oil film mesh is generated by universal finite analysis software CFD; then, carry on numerical simulations for pressure distribution and temperature distribution of the two studied hydrostatic thrust bearing under various viscosity, and make comparative analysis for difference between the two studied hydrostatic thrust bearing. Based on the analysis of numerical simulation results, the conclusions whether oil-return groove is set for hydrostatic bearing could be received. Simulation results reveal truly the influence of setting oil-return groove or not on hydrostatic thrust bearing, and improve structure design for hydrostatic thrust bearing.

Research on Temperature Field of Hydrostatic Thrust Bearing with Annular Cavity Multi-Pad

2011 ◽  
Vol 121-126 ◽  
pp. 3477-3481
Author(s):  
Xiao Dong Yu ◽  
Xiu Li Meng ◽  
Bo Wu ◽  
Chun Li Gao ◽  
Zhi Xin Qiu ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Temperature Field ◽  
Thermal Deformation ◽  
Thrust Bearing ◽  
Three Dimensional ◽  
Distribution Law ◽  
Simulation Research ◽  
Temperature Performance ◽  
Simulation Results ◽  
Volume Method

A simulation research concerning temperature field of hydrostatic thrust bearing having annular cavities multi-pad was described in order to solve the thermal deformation of the hydrostatic thrust bearing with annular cavity multi-pad in the heavy CNC equipment. The Finite Volume Method of CFX has been used to compute three-dimensional temperature field of gap fluid between the rotation worktable and base. This study theoretically analyzes the influence of rotating velocity on the bearing temperature performance according to computational fluid dynamics and lubricating theory. It has revealed its temperature distribution law. The simulation results indicate that an improved characteristic will be affected by rotating velocity easily, and oil cavity temperature increases by gradually with rotating velocity enhancing. Through this method, the safety of a hydrostatic thrust bearing having annular cavities multi-pad 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 thrust bearing in the heavy CNC equipment.

Influence Research of Recess Shape on Dynamic Effect of Hydrostatic Thrust Bearing

2013 ◽  
Vol 274 ◽  
pp. 57-60
Author(s):  
Xiao Dong Yu ◽  
Zhen Guo Li ◽  
De Fan Zhou ◽  
Heng Wei Li ◽  
Chun Li Gao ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Thermal Deformation ◽  
Thrust Bearing ◽  
Pressure Field ◽  
Three Dimensional ◽  
Dynamic Effect ◽  
Loading Capacity ◽  
Simulation Research ◽  
Simulation Results ◽  
Volume Method

This work describes a simulation research concerning dynamic effect of multi-pad hydrostatic thrust bearing having rectangular recess, sector recess, ellipse recess and I-shaped recess in order to solve the loading capacity of the hydrostatic thrust bearing. Three-dimensional pressure field of gap fluid between the rotation worktable and the base has been computed by using the Finite Volume Method. This study theoretically analyzes the influence of recess shape on dynamic effect of the bearing according to computational fluid dynamics and lubricating theory, and the simulation results indicate that an improved characteristic will be affected by recess shape easily. Through this method, the safety of a multi-pad hydrostatic thrust bearing having different cavities can be forecasted, and the optimal loading capacity of such products can be achieved, so it can provide reasonable data for design, lubrication, experience and thermal deformation computation for hydrostatic thrust bearing.

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.

Determination of the Discharge Coefficient of a Thin-Walled Orifice Used in Hydrostatic Bearings

2005 ◽  
Vol 127 (3) ◽  
pp. 679-684 ◽  
Author(s):  
S. Charles ◽  
O. Bonneau ◽  
J. Fre^ne
Keyword(s):  
Discharge Coefficient ◽  
Ad Hoc ◽  
Thrust Bearing ◽  
Accurate Estimation ◽  
Hydrostatic Bearing ◽  
Hydrostatic Bearings ◽  
Flow Through ◽  
Thin Walled ◽  
Experimental Bench

The characteristics of hydrostatic bearings can be influenced by the compensating device they use, for example, a thin-walled orifice (diaphragm). The flow through the orifice is given by a law where an ad hoc discharge coefficient appears, and, in order to guarantee the characteristics of the hydrostatic bearing, this coefficient must be calibrated. The aim of this work is to provide an accurate estimation of the discharge coefficient under specific conditions. Therefore an experimental bench was designed and a numerical model was carried out. The results obtained then by the experimental and theoretical approach were compared with the values given by the literature. Finally, the influence of the discharge coefficient on the behavior of a thrust bearing is examined.

Study on Precision Forging Schemes of Hypoid Driving Gear

2012 ◽  
Vol 472-475 ◽  
pp. 692-695
Author(s):  
Jian Hua Wang ◽  
Fu Xiao Chen
Keyword(s):  
Equivalent Stress ◽  
Three Dimensional ◽  
Equivalent Strain ◽  
Precision Forging ◽  
Forming Technology ◽  
Blank Shape ◽  
Simulation Results ◽  
Three Dimensional Models ◽  
3D Software ◽  
Deform 3D

By analyzing the characteristics and forming technology of hypoid driving gear, it was suitable for adopting fully enclosed die forging principle to form the gear. Based on different forging methods, three kinds of blank shape and corresponding forming schemes were designed. The three dimensional models of blank and die were created by the UG software. The three forming schemes were simulated by the Deform-3D software. The simulation results of distribution of equivalent stress, distribution of equivalent strain and load-stroke curve were comparatively analyzed. Then the most reasonable scheme was chosen. At last, the rationality of numerical simulation can be further verified by the optimized scheme was proved by experiment.

NUMERICAL SIMULATION OF FLOW FIELD IN THE HOMININE PHARYNGEAL CAVITIES OF DIFFERENT MORPHOLOGY

2015 ◽  
Vol 27 (02) ◽  
pp. 1550019
Author(s):  
Chi Yu ◽  
Gang Wang ◽  
Shu-Hua Chen
Keyword(s):  
Three Dimensional ◽  
Upper Airway ◽  
Healthy Person ◽  
Pharyngeal Cavity ◽  
Airflow Distribution ◽  
Obstructive Sleep ◽  
Airflow Field ◽  
Three Dimensional Models ◽  
And Function ◽  
Volume Method

Based on the data which came from the spiral Computerized Tomography (CT) images of the healthy person, primary snore (PS) patients and Obstructive Sleep Apnea–Hypopnea Syndrome (OSAHS) patients, the reconstruction three-dimensional models precisely preserve original configuration of pharyngeal cavity. The airflow of the cavity is simulated numerically and analyzed by the finite volume method. The results of the pressure and velocity distributions in the airflow field are quantitatively determined. Pressure gradients of airway are lower in the healthy person, the airflow distribution is quite uniform with free breath, and however, the PS patients and OSAHS patients remarkably escalates both the pressure and velocity of the pharyngeal cavity. The present study is useful for the quantitative mutual relationship between configuration and function in the upper airway, pathogenesis and diagnosing the diseases related to the anatomical structure and the function of upper airway.

Research on Buckling Mechanism of U Type Steel Support’s Pinnas Based on ANSYS

2012 ◽  
Vol 466-467 ◽  
pp. 1271-1274
Author(s):  
Jian Zhuang Liu ◽  
Jia Li ◽  
Li Gan ◽  
Fang Fang Du
Keyword(s):  
Stress Distribution ◽  
Cross Section ◽  
Coal Mine ◽  
Optimization Design ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Type Steel ◽  
Buckling Failure ◽  
Simulation Results ◽  
Three Dimensional Models

The prevenient mechanical research on U type steel support focuses on two dimensional analysis in the installing plan. Interested in the buckling failure of U type steel support’s pinnas in one coal mine of Huainan Group, the authors build three dimensional models to stimulating 25U and 29U support. The appealing simulation results verify ANSYS’s 3-D computational capabilities about complicated section support. The main objective of their investigation has been to obtain some knowledge of the mechanism, stress distribution, and load magnitude in the support’s deforming. Further, the deviating longitudinal load play an accelerating deformation role on its distorting, which should be paied more attention to cross-section optimization, design of support parameters, and installing way of steel lacing.

The Simulation of Rolling Process of Wire with Y-Type Roller

2014 ◽  
Vol 602-605 ◽  
pp. 709-712
Author(s):  
Jin Hong Ma ◽  
Bin Tao ◽  
Xiao Han Yao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rolling Mill ◽  
Three Dimensional ◽  
Rolling Process ◽  
Stress And Strain ◽  
Analysis Software ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Three Dimensional Models

Y-Type rolling mill with three roller is a new kind of wire mill.The three-dimensional models of rolling are established by Pro/E. Based on the finite element analysis software ANSYS/LS-DYNA, the rolling process of wire by Y-type rollers is simulated. The rolling piece movement is analysed. Stress and strain of Y-type roller are also analysed.

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.

Research on Velocity Influence on Thermal Deformation Field of Heavy Hydrostatic Thrust Bearing

2010 ◽  
Vol 129-131 ◽  
pp. 968-972
Author(s):  
Xiao Dong Yang ◽  
Jun Peng Shao ◽  
Xiao Qiu Xu ◽  
Yun Fei Wang ◽  
Chao Yin ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Theoretical Basis ◽  
Thermal Deformation ◽  
Thrust Bearing ◽  
Structure Design ◽  
Shape Deformation ◽  
Hydrostatic Bearing ◽  
Deformation Problem ◽  
Heavy Equipment ◽  
Wedge Shape

According to the structure of workbench and base of heavy hydrostatic bearing which is applied in heavy equipment, thermal deformation equations of the structure are deduced and boundary conditions for numerical simulation are established based on thermal elasticity theory. Then thermal deformation of hydrostatic bearing without load is calculated at different velocity. The results indicate that: temperature and velocity impacts a significant influence on thermal deformation of hydrostatic bearing. Thermal deformation increases as the velocity increases; workbench up-warps severely, oil-pad inclines towards outside to a certain extent, which results in the lubrication clearance emerges as wedge-shape deformation. The conclusions from thermal deformation calculation could provide theoretical basis for structure design of hydrostatic bearing and ravel out the thermal deformation problem.

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