Theoretical and Experimental Investigation on Air Film Pressure Field Characteristics of Aerostatic Thrust Bearing

2021 ◽  
pp. 135065012110689
Author(s):  
Guoda Chen ◽  
Qi Lu ◽  
Yifan Ge ◽  
Wei Zhang
Keyword(s):  
Experimental Investigation ◽  
External Load ◽  
Thrust Bearing ◽  
Pressure Field ◽  
Measurement Equipment ◽  
Film Pressure ◽  
Theoretical Simulation ◽  
Simulation Results ◽  
Air Film ◽  
Theoretical Results

This paper studied the air film pressure field (AFPF) characteristics of aerostatic thrust bearing, in which we proposed the measurement equipment for the 2D AFPF and successfully verified the theoretical simulation results. The experimental results agreed well with the theoretical results. However, in the area between the distribution circle of orifice to the air film outlet boundary, the experimental air film pressure (AFP) was slightly higher than the theoretical one. While for the area between the distribution circle of orifice and the center of the bearing, it showed the opposite law. Besides, the increase ratio of the AFP was close to that of the external load with its increase.

An Experimental Investigation of a Tilting-Pad, Compliant-Surface, Thrust Bearing

1976 ◽  
Vol 98 (1) ◽  
pp. 95-110 ◽  
Author(s):  
Glenn K. Rightmire ◽  
Vittorio Castelli ◽  
Dudley D. Fuller
Keyword(s):  
Experimental Investigation ◽  
Film Thickness ◽  
Thrust Bearing ◽  
Lubricant Film ◽  
Film Pressure ◽  
Compliant Surface ◽  
Pressure Fields ◽  
Tilting Pad ◽  
Typical Range

Results are provided for an investigation of a compliant-surface, tilting-shoe bearing, when operating in oil. Two values of elastomer durometer were used on shoes as well as seven different pivot locations. The investigation included measurements of lubricant film pressure fields and film-thickness profiles under the shoes during operation. Friction and overall stiffness were also recorded for a typical range of speeds, loads, and pivot positions.

scholarly journals Theoretical Simulation and Experimental Investigation of a Rail Damper to Minimize Short-Pitch Rail Corrugation

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Caiyou Zhao ◽  
Ping Wang ◽  
Xi Sheng ◽  
Duo Meng
Keyword(s):  
Experimental Investigation ◽  
Frequency Domain ◽  
Field Test ◽  
Dynamic Models ◽  
Vibration Mode ◽  
Theoretical Simulation ◽  
Rail Corrugation ◽  
Theoretical Results ◽  
Rail Damper

The Cologne-egg fastening systems applied in metro lines, which can be subjected to rail corrugation, are considered in this paper. To understand the mechanism of the formation and development of rail corrugation, dynamic models of the wheel and the track with Cologne-egg fastening system in the frequency domain are developed to analyse the wheel and track vibration behaviour. A field test is also analysed to verify the validity of the mechanism. Using these experimental and theoretical results, the vibration mode of the rail that is responsible for rail corrugation is determined. Based on the results, a novel rail damper that can suppress the track pinned-pinned resonance and smooth the track receptance is presented to minimize short-pitch rail corrugation. It is ultimately found from theoretical simulation and experimental investigation that the application of the rail damper is a long-term and effective method of controlling short-pitch rail corrugation in metro lines.

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.

On the Analytical and Experimental Investigation of a Hydrostatic, Axisymmetric Compliant-Surface Thrust Bearing

1967 ◽  
Vol 89 (4) ◽  
pp. 510-519 ◽  
Author(s):  
V. Castelli ◽  
G. K. Rightmire ◽  
D. D. Fuller
Keyword(s):  
Experimental Investigation ◽  
Elasticity Theory ◽  
Linear Elasticity ◽  
Thrust Bearing ◽  
Theoretical Data ◽  
Linear Elasticity Theory ◽  
Compliant Surface ◽  
Theoretical Results

The paper presents experimental and theoretical data on the axisymmetric hydrostatic thrust bearing with one bonded compliant surface. The theoretical results are exact and are based on linear elasticity theory. The effects of compliance on the behavior of the thrust bearing are discussed and illustrated.

Simulation and experiment on pressure field characteristics of hydrostatic hydrodynamic hybrid thrust bearings

2019 ◽  
Vol 71 (1) ◽  
pp. 102-108 ◽  
Author(s):  
Jun-peng Shao ◽  
Guang-dong Liu ◽  
Xiaodong Yu
Keyword(s):  
Bearing Capacity ◽  
Thrust Bearing ◽  
Pressure Field ◽  
Dynamic Pressure ◽  
Film Pressure ◽  
Content Type ◽  
Oil Film ◽  
Pressure Fields ◽  
Rotary Speed ◽  
Oil Film Pressure

PurposeThis paper aims to improve the bearing capacity of hydrostatic thrust bearing under working conditions of high speed and heavy load; a new wedge-shaped structure opened on an edge of oil seal is put forward, the loss and insufficiency for hydrostatic bearing capacity are made up by using dynamic pressure, and then, hydrostatic hydrodynamic lubrication is realized.Design/methodology/approachOil film three-dimensional models of unidirectional and bi-directional hydrostatic hydrodynamic oil pad are established by using UG. The oil film pressure fields of two kinds of oil pad are simulated by using ANSYS ICEM CFD and ANSYS CFX; the pressure fields distribution characteristics are obtained, and the effects of workbench rotary speed and bearing weight on pressure field are analyzed. Also, the experimental verification is made.FindingsThe results demonstrate that with an increase in workbench rotary speed, the oil film pressure of two kinds of hybrid oil pad increases gradually, and the maximum pressure of the bi-directional one accounts for 95 per cent of the unidirectional one when the load is constant. With an increase in load, the oil film pressure of two kinds of hybrid oil pad increases gradually, the difference between them is 9.4 per cent under the condition of load of 25twhen the rotary speed is constant.Originality/valueThe paper can provide theoretical basis for a structure design of hybrid thrust bearing under different rotary speed and load conditions, and compensate the shortage of static pressure-bearing capacity by using dynamic pressure, improve the stability of vertical CNC machining equipment.

Bi-layered/tri-layered bio-media in direct contact with metal diagonal horn for hyperthermia

2018 ◽  
Vol 10 (8) ◽  
pp. 921-932
Author(s):  
Soni Singh ◽  
Bhagirath Sahu ◽  
S. P. Singh
Keyword(s):  
Reflection Coefficient ◽  
Direct Contact ◽  
Specific Absorption Rate ◽  
Effective Field ◽  
Field Size ◽  
Theoretical Simulation ◽  
Temperature Distributions ◽  
Fat Thickness ◽  
Simulation Results ◽  
Theoretical Results

AbstractIn this paper, theoretical/simulation study of specific absorption rate (SAR) and/or temperature distributions in a bi-layered bio-media (fat and muscle)/realistic tri-layered bio-media (skin, fat, and muscle layers) in direct contact with water-loaded metal diagonal horn (MDH) designed at 915 MHz are investigated. The effects of fat thickness on the input reflection coefficient, reflection coefficient at the interface between the MDH and the bi-layered bio-media, and the SAR distribution in the bi-layered bio-media are also studied through simulation and theoretically at 915 MHz. Further, the SAR parameters such as penetration depth and effective field size inside the bi-layered bio-media due to the MDH are evaluated theoretically and the theoretical results are compared with the corresponding simulation results. Finally, SAR and temperature distributions in tri-layered bio-media without and with embedded irregular/oval-shaped tumor are provided for demonstrating the hyperthermia performance of the MDH applicator.

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.

scholarly journals A Convergent Collocation Approach for Generalized Fractional Integro-Differential Equations Using Jacobi Poly-Fractonomials

Mathematics ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 979
Author(s):  
Sandeep Kumar ◽  
Rajesh K. Pandey ◽  
H. M. Srivastava ◽  
G. N. Singh
Keyword(s):  
Differential Equation ◽  
Fractional Derivative ◽  
Collocation Method ◽  
Caputo Fractional Derivative ◽  
Fractional Derivatives ◽  
Special Cases ◽  
Collocation Approach ◽  
Linear And Nonlinear ◽  
Simulation Results ◽  
Theoretical Results

In this paper, we present a convergent collocation method with which to find the numerical solution of a generalized fractional integro-differential equation (GFIDE). The presented approach is based on the collocation method using Jacobi poly-fractonomials. The GFIDE is defined in terms of the B-operator introduced recently, and it reduces to Caputo fractional derivative and other fractional derivatives in special cases. The convergence and error analysis of the proposed method are also established. Linear and nonlinear cases of the considered GFIDEs are numerically solved and simulation results are presented to validate the theoretical results.

Rough Air-Soft Elastohydrodynamic Lubrication

2013 ◽  
Vol 420 ◽  
pp. 30-35
Author(s):  
Khanittha Wongseedakaew ◽  
Jesda Panichakorn
Keyword(s):  
Surface Roughness ◽  
Film Thickness ◽  
Modulus Of Elasticity ◽  
Contact Region ◽  
Elastohydrodynamic Lubrication ◽  
Multilevel Methods ◽  
Inlet Temperature ◽  
Film Pressure ◽  
Air Inlet ◽  
Air Film

This paper presents the effects of rough surface air-soft elastohydrodynamic lubrication (EHL) of rollers for soft material under the effect of air molecular slip. The time independent modified Reynolds equation and elasticity equation were solved numerically using finite different method, Newton-Raphson method and multigrid multilevel methods were used to obtain the film pressure profiles and film thickness in the contact region. The effects of amplitude of surface roughness, modulus of elasticity and air inlet temperature are examined. The simulation results showed surface roughness has effect on film thickness but it little effect to air film pressure. When the amplitude of surface roughness and modulus of elasticity increased, the air film thickness decreased but air film pressure increased. However, the air inlet temperature increased when the air film thickness increased.

Design of Magnetic Levitated Thrust Bearing Experiment Table

2011 ◽  
Vol 199-200 ◽  
pp. 597-602
Author(s):  
Shou Fa Liu ◽  
Zhang Jie Shi ◽  
Chun Feng Li
Keyword(s):  
Thrust Bearing ◽  
Deformation Measurement ◽  
Experimental Results ◽  
Electromagnetic Parameters ◽  
Ansys Simulation ◽  
Overall Design ◽  
Experimental Parameters ◽  
Structural Dimensions ◽  
Simulation Results

In this paper, the overall design of magnetic levitated thrust bearing experiment table was completed, of which the main experimental parameters those are electromagnetic parameters and structural dimensions were determined, in addition, the joint debugging and deformation measurement are performed. Analysis results showed that theoretical value, ANSYS simulation results and experimental results were similar, which said that it is feasible to perform stiffness check of the thrust collar on the experiment table.

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