Design and performance analysis on heat pipe hydrostatic thrust bearings based on rectangular oil pad

2018 ◽  
Vol 70 (7) ◽  
pp. 1251-1257
Author(s):  
Xibing Li ◽  
Weixiang Li ◽  
Xueyong Chen ◽  
Ming Li ◽  
Huayun Chen ◽  
...  
Keyword(s):  
Temperature Field ◽  
Heat Pipe ◽  
Temperature Rise ◽  
Dry Friction ◽  
Thermal Deformation ◽  
Thrust Bearing ◽  
Processing Quality ◽  
Content Type ◽  
Thrust Bearings

Purpose The purpose of this paper is to examine the effect of application of a heat pipe in an aspect of hydrostatic thrust bearings on thermal balance and deformation and the role of this application in increasing the rotating speed of a workbench. Design/methodology/approach Numerical simulations of oil film temperature field, the temperature field and thermal deformation of the bearing’s workbench and base were performed by finite element analysis (FEA) software for both the traditional hydrostatic thrust bearings and the heat pipe ones. Findings Oil pad and workbench of the hydrostatic thrust bearings are fabricated with a heat pipe cooling structure, which can take away most of the heat generated by shearing of the oil film, control the temperature rise and thermal deformation of the hydrostatic thrust bearing effectively, avoid the dry friction phenomenon and finally improve the processing quality of equipment. Originality/value The heat pipe hydrostatic thrust bearings could control the temperature rise and thermal deformation of the hydrostatic thrust bearing effectively, avoid the dry friction phenomenon and improve the processing quality of equipment.

On the performance of foil thrust bearing with misaligned bearing runner

2017 ◽  
Vol 69 (2) ◽  
pp. 105-115 ◽  
Author(s):  
Abdelrasoul M. Gad
Keyword(s):  
High Speed ◽  
Thrust Bearing ◽  
Approximation Technique ◽  
Hydrodynamic Effect ◽  
Stable Operation ◽  
Content Type ◽  
Thrust Bearings ◽  
Load Carrying ◽  
Foil Thrust Bearing ◽  
Stiffness And Damping

Purpose Compliant foil thrust bearings are promising bearings for high-speed oil-free turbomachinery. However, most previous experimental and numerical approaches to investigate the performance of these bearings have ignored the effect of bearing runner misalignment. Therefore, this paper aims to evaluate the effects of static and dynamic angular misalignments of the bearing runner on the performance of a gas-lubricated foil thrust bearing. Design/methodology/approach The bearing runner is allowed a maximum angular misalignment that produces a minimum gas film thickness as low as 20 per cent of the nominal clearance. Then, the variations of bearing load carrying capacity, viscous power loss and stiffness and damping coefficients of the gas film with runner misalignment are thoroughly analyzed. The flow in the gas film is modeled with compressible Reynolds equation along with the Couette approximation technique, and the deformation of the compliant bearing is calculated with a robust analytical model. Small perturbations method is used to calculate the force and moment dynamic coefficients of the gas film. Findings The results show that misaligned foil thrust bearings are capable of developing a restoring moment sufficient enough to withstand the imposed misalignments. Furthermore, the enhanced hydrodynamic effect ensures a stable operation of the misaligned bearing, and the results highlighted the role of the compliant bearing structure to maintain foil bearing prominent features even at misaligned conditions. Originality/value The value of this study is the evaluation of the effects of runner angular misalignments on the static and dynamic characteristics of Generation II bump-type foil thrust bearing.

Contrastive Analysis on Thermal Deformation of Thrust Bearing Pad with Two Kind of Supporting

2014 ◽  
Vol 494-495 ◽  
pp. 554-557
Author(s):  
Yong Hai Li ◽  
Shi Bo Liu ◽  
Rong Kui Yao ◽  
Jian Wang ◽  
Ning Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Temperature Field ◽  
Thermal Deformation ◽  
Thrust Bearing ◽  
Deformation Field ◽  
Contrastive Analysis ◽  
Tilting Pad ◽  
Finite Element Numerical Simulation ◽  
Point Line

In order to solve thermal deformation, the finite element numerical simulation of two kind of tilting pad thrust bearing is made for the same pad surface, and thermal deformation is made to analyze comparatively. The results show that the temperature field, the deformation field and the values of pad are similar for two different supported thrust bearing (point, line support) under the same operating condition. The pad temperature and deformation will increase with the increasing of pv values. According to the calculation conditions, the temperature field rose about 1°C, and the thermal deflection increased 0.002mm with pv value increased by 10%.

scholarly journals Numerical study on temperature field of the sandwich plate defects based on MATLAB

2020 ◽  
Vol 143 ◽  
pp. 01003 ◽  
Author(s):  
Ruoyang Zhou ◽  
Xiaoxiong Zha ◽  
Chao Wang
Keyword(s):  
Temperature Field ◽  
Thermal Imaging ◽  
Sandwich Plate ◽  
Numerical Study ◽  
Heating Time ◽  
Thickness Direction ◽  
Processing Quality ◽  
Infrared Thermal Imaging ◽  
Different Thickness

As for the defects of the plate whose length and width are more than 8 times larger than the thickness direction, the finite difference numerical calculations are carried out by using the software of MATLAB. The surface temperature of defects in different positions, different thickness defects, different heating heat flow and heating time, and defects under defects are analyzed correspondingly by the program. According to the temperature difference results of the flawless surface and the flawed surface, the feasibility of infrared thermal imaging to detect the defects of the sandwich plate is analyzed to ensure the processing quality of the sandwich plate.

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.

The study of the temperature field in an infinite slab under line and plane heat source

2015 ◽  
Vol 25 (1) ◽  
pp. 25-32 ◽  
Author(s):  
Wang Qing-Cheng ◽  
Wu Zhao-Chun ◽  
Zhu Xiang-Ping
Keyword(s):  
Temperature Field ◽  
Heat Source ◽  
Temperature Rise ◽  
Temperature Fields ◽  
Manufacturing Processes ◽  
Heat Sources ◽  
Content Type ◽  
Infinite Slab ◽  
Different Types ◽  
Changing Patterns

Purpose – The purpose of this paper is to reveal the characteristics of the temperature field under different types of heat sources, which are significant to the temperature control encountered in practical manufacturing processes. Design/methodology/approach – The temperature fields in an infinite slab under line or plane heat source are calculated numerically by control volume approach and ADI scheme, and the numerical results of the temperature rise have been compared among the different types of the heat sources. Findings – The numerical results show the different changing patterns of temperature fields under line and plane heat source, respectively, and demonstrate that the magnitude of temperature rise depends strongly on the type of the heat sources. The order of temperature rise from high to low is point, line and plane heat source base on the same input heat. Originality/value – The study is original and findings are new, which demonstrate the different changing patterns of temperature fields and the magnitude of temperature rise under line and plane heat source. The numerical solution is significant for the temperature control in practical manufacturing processes.

Simulation Research on Temperature Field of Circular Cavity Hydrostatic Thrust Bearing

2009 ◽  
Vol 419-420 ◽  
pp. 141-144 ◽  
Author(s):  
Xiao Dong Yu ◽  
Xiu Li Meng ◽  
Bo Wu ◽  
Jun Peng Shao ◽  
Yan Qin Zhang ◽  
...  
Keyword(s):  
Temperature Field ◽  
Thermal Deformation ◽  
Thrust Bearing ◽  
Three Dimensional ◽  
Circular Cavity ◽  
Cavity Radius ◽  
Distribution Law ◽  
Cavity Depth ◽  
Simulation Research ◽  
Heavy Equipment

In order to solve the thermal deformation of the hydrostatic thrust bearing in the heavy equipment, a simulation research concerning temperature field of multi-pad hydrostatic thrust bearing having circular cavities was described. The Finite Volume Method of Fluent 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 cavity radius and cavity depth 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 can be gotten from a circular cavity hydrostatic thrust bearing, oil cavity temperature decreases by gradually with cavity radius enhancing, oil cavity temperature decreases by gradually with cavity depth. Through this method, the safety of a hydrostatic thrust bearing having circular cavities multi-pad can be forecasted, and the optimal design of such products can be achieved, so it can provide reasonable data for design and lubrication and experience and thermal deformation computation for hydrostatic thrust bearing in the heavy equipment.

Temperature rise characteristic of MR fluid in a multi-disc MR clutch under slip condition

2015 ◽  
Vol 67 (2) ◽  
pp. 85-92 ◽  
Author(s):  
Daoming Wang ◽  
Youfu Hou ◽  
Zuzhi Tian ◽  
Qingrui Meng
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
Temperature Rise ◽  
Slip Condition ◽  
Impact Factors ◽  
Gap Size ◽  
Mr Fluid ◽  
Content Type ◽  
Heat Transfer Theory ◽  
The Impact

Purpose – This study aims to reveal the temperature rise characteristic of magnetorheological (MR) fluid in a multi-disc MR clutch under slip condition, including the temperature distribution regularity and the impact factors. Design/methodology/approach – Three-dimensional transient heat conduction equation for the MR fluid in the working gap was derived based on the heat transfer theory. Then, numerical simulation was conducted to analyze the temperature field of MR fluid. Furthermore, an experimental study was performed to explore the temperature distribution of the MR fluid in radial and circumferential directions, as well as the effects of disc groove, slip power and gap size on temperature rise characteristic of the MR fluid. Findings – The results show that temperature appears to be largest in the center of the working gap and the temperature difference increases with the slip time. However, the temperature field in a circumferential direction is basically the same, but it presents slightly lower in the groove area. The temperature of the MR fluid increases linearly with the slip time and the rise rate increases with the slip power. Moreover, the temperature rise value decreases with the increase of gap size. Originality/value – In this paper, the temperature gradients, both in radial and circumferential directions, are experimentally measured going beyond the estimation by computer simulations. In addition, the factors that influence the temperature rise characteristic of MR fluid were fully analyzed. The results could provide a reliable basis for the development of cooling technology for high-power MR devices.

Computation of Thermal Deformation of Thrust Bearing Pad Concerning the Convection by Non-Uniform Oil Flow

2005 ◽  
Author(s):  
Makoto Hemmi ◽  
Koushu Hagiya ◽  
Katsuhisa Ichisawa ◽  
Sukeyuki Fujita
Keyword(s):  
Temperature Distribution ◽  
Thermal Deformation ◽  
Thrust Bearing ◽  
Oil Film ◽  
Thrust Bearings ◽  
Turbine Generators ◽  
Precise Estimation ◽  
Tilting Pad ◽  
Oil Flow ◽  
Water Turbine

Tilting-pad thrust bearings are used to support the loads of large rotating machinery, such as water turbine generators. When such machines are in operation, thermal deformation is so extensive that it is comparable to deformation caused by the pressure of the oil film, and it influences the bearing’s performance. So, the temperature distribution in the pad, which determines the thermal deformation, should be calculated correctly. This requires precise estimation of the convection by the ambient oil at the pad’s surfaces, but the complexity of the pad’s shape and ambient oil flow of oil around it makes this estimation difficult. Using CFD (Computational Fluid Dynamics) software, we computed the temperature distribution in the pad by solving the heat transfer in the pad, in the oil and interfaces of them simultaneously. The thermal and stress deformation were then calculated by the FEM code and is used in oil film analysis to determine the characteristics of the bearing. Comparing its results with the experimental ones validated the computational process.

Simulation of the temperature field for massive concrete structures using an interval finite element method

2020 ◽  
Vol 37 (7) ◽  
pp. 2467-2486
Author(s):  
Zhiqiang Xie ◽  
Lei Wang ◽  
Zhengyang Zhu ◽  
Zhi Fu ◽  
Xingdong Lv
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
Temperature Rise ◽  
Adiabatic Temperature ◽  
Monitoring Data ◽  
Adiabatic Temperature Rise ◽  
Content Type ◽  
Interval Finite Element Method ◽  
Element Method

Purpose The purpose of this paper is to introduce an interval finite element method (IFEM) to simulate the temperature field of mass concrete under multiple influence uncertainties e.g. environmental temperature, material properties, pouring construction and pipe cooling. Design/methodology/approach Uncertainties of the significant factors such as the ambient temperature, the adiabatic temperature rise, the placing temperature and the pipe cooling are comprehensively studied and represented as the interval numbers. Then, an IFEM equation is derived and a method for obtaining interval results based on monotonicity is also presented. To verify the proposed method, a non-adiabatic temperature rise test was carried out and subsequently simulated with the method. An excellent agreement is achieved between the simulation results and the monitoring data. Findings An IFEM method is proposed and a non-adiabatic temperature rise test is simulated to verify the method. The interval results are discussed and compared with monitoring data. The proposed method is found to be feasible and effective. Originality/value Compared with the traditional finite element methods, the proposed method taking the uncertainty of various factors into account and it will be helpful for engineers to gain a better understanding of the real condition.

Summary of Research on Oil Film Temperature Characteristic of Hydrostatic and Hydrodynamic Thrust Bearings

2021 ◽  
Vol 14 ◽  
Author(s):  
Yanan Feng ◽  
Xiaodong Yu ◽  
Zelin Han ◽  
Shihao Li ◽  
Bangyao Tang ◽  
...  
Keyword(s):  
Temperature Rise ◽  
Thrust Bearing ◽  
Friction Pair ◽  
Dynamic Pressure ◽  
Operational Reliability ◽  
Lubricating Oil ◽  
Research Directions ◽  
Oil Film ◽  
Specific Research ◽  
Thrust Bearings

Background: In order to explore the temperature rise and distribution of the micro-gap lubricating oil film of the hydrostatic and hydrodynamic thrust bearing, further solve the problem of thermal deformation of the friction pair of the hydrostatic and hydrodynamic support and improve the operation accuracy and stability of the hydrostatic and hydrodynamic thrust bearing. Objective: Combined with the theory of dynamic and static pressure bearings, the problem of lubricating oil film temperature rise is analyzed, and specific research directions are proposed. It is hoped that it will be helpful to improve the research of bearing stability and provide a theoretical basis for the structural design and operational reliability of heavy hydrostatic bearings. Methods: This article summarizes the research status of the oil film temperature rise of hydrostatic and hydrodynamic thrust bearings, especially focusing on the influence of hot oil carrying on the temperature rise of the lubricating oil film, and finally the specific research directions and methods of the oil film temperature rise are prospected. Conclusion: Aiming at the research hotspots of lubricating oil film temperature rise and distribution, based on the analysis of the principle of hydrostatic and dynamic pressure bearings, the domestic and foreign literature on the influence of the micro-gap lubricating oil film temperature rise and distribution of hydrostatic and hydrodynamic thrust bearings is collected and analyzed. The research shows that although some research results have been made in this area, due to current research methods and angle analysis still have certain limitations, so the study of the oil film temperature rise is not comprehensive, and further detailed discussion and analysis are still needed.

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