scholarly journals Study of Groove Parameters on the Hydrodynamic Behavior of Spiral-Grooved Thrust Bearing with Gas Lubricant

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Xianfei Xia ◽  
Yu Chen ◽  
Xiuying Wang ◽  
Yu Sun
Keyword(s):  
Thrust Bearing ◽  
Mechanical Systems ◽  
Computational Method ◽  
Hydrodynamic Characteristics ◽  
Published Data ◽  
Hydrodynamic Behavior ◽  
Groove Shape ◽  
Lubrication Performance ◽  
Hydrodynamic Response ◽  
Simulation Results

The gas-lubricated thrust bearing is widely used in agriculture mechanical systems, and the groove shape plays an important role on the hydrodynamic behavior of spiral-grooved thrust bearing (SGTB). Although the groove shape may change smaller, it is clear that the hydrodynamic response is very sensitive to the groove parameters. This paper proposes a computational method for the analysis of SGTB with gas lubricant, considering the effects of groove parameters. With the compressibility taken into account, the evaluation of lubrication performance for SGTB is obtained by the CFD technology. Also, the simulation results are compared with the published data, which indicates that the presented model of SGTB is able to obtain more realistic results of hydrodynamic characteristics of SGTB. Moreover, the mapping relationship between groove parameter and hydrodynamic behavior of SGTB is represented.

Investigations on influence of groove shapes for the journal bearing in high-speed and heavy-load press system

2018 ◽  
Vol 70 (1) ◽  
pp. 230-240 ◽  
Author(s):  
Yu Chen ◽  
Yu Sun ◽  
Chunping Cao
Keyword(s):  
High Speed ◽  
Design Methodology ◽  
Journal Bearing ◽  
Computational Method ◽  
Hydrodynamic Characteristics ◽  
Hydrodynamic Behavior ◽  
Heavy Load ◽  
Content Type ◽  
Thermal Influence ◽  
Fluid Interaction

Purpose The purpose of this study is to investigate the hydrodynamic characteristics of journal bearings in a high-speed and heavy-load press system by considering thermal influence and cavitation. Design/methodology/approach A proper and effectual computational method is presented for steady-state analysis of fluid interaction in a rotor-bearing press system by combining computational fluid dynamics techniques. Findings The influences of eccentricity ratio, rotational speed and oil-film thickness on the hydrodynamic behavior of the journal bearing are studied. Originality/value The computational method can be used for creating a precise lubrication design for a journal bearing of a lubrication system.

Effect of groove shape on the hydrodynamic lubrication of journal bearing considering cavitation

2019 ◽  
Vol 37 (5) ◽  
pp. 1557-1576 ◽  
Author(s):  
Yu Chen ◽  
Jun Feng ◽  
Y. Sun ◽  
Xu Peng ◽  
Qiao Dai ◽  
...  
Keyword(s):  
Journal Bearing ◽  
Hydrodynamic Lubrication ◽  
Hydrodynamic Characteristics ◽  
Operation Condition ◽  
Content Type ◽  
Hydrodynamic Simulations ◽  
Groove Shape ◽  
Operation Conditions ◽  
Lubrication Performance ◽  
Shape Selection

Purpose The purpose of this study is to investigate the influence of groove shape on the hydrodynamic characteristics of a journal bearing. Design/methodology/approach The computational fluid dynamics model also takes into account the cavitation phenomena and thermal effect, which can illustrate the lubrication performance of a journal bearing. Findings The hydrodynamic simulations of the journal bearing with the different groove shapes are conducted under different operation conditions. Originality/value Based on the numerical analysis, the suggestions are presented for groove shape selection and can be used to the design of a journal bearing under the extreme operation condition.

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.

Effect of recess depth on lubrication performance of annular recess hydrostatic thrust bearing by constant rate flow

2018 ◽  
Vol 70 (1) ◽  
pp. 68-75 ◽  
Author(s):  
Jun-peng Shao ◽  
Guang-dong Liu ◽  
Xiao-dong Yu ◽  
Yan-qin Zhang ◽  
Xiu-li Meng ◽  
...  
Keyword(s):  
Thrust Bearing ◽  
Simulation Method ◽  
Content Type ◽  
Oil Film ◽  
Constant Rate ◽  
Lubrication Performance ◽  
Optimal Value ◽  
Improved Performance ◽  
Lubrication Characteristics ◽  
Volume Method

Purpose The purpose of this paper is to describe a simulation and experimental research concerning the effect of recess depth on the lubrication performance of a hydrostatic thrust bearing by constant rate flow. Design/methodology/approach The computational fluid dynamics and finite volume method have been used to compute the lubrication characteristics of an annular recess hydrostatic thrust bearing with different recess depths. The performances are oil recess pressure, oil recess temperature and oil film velocity. The recess depth has been optimized. A test rig is established for testing the pressure field of the structure of hydrostatic thrust bearing after recess depth optimization, and experimental results show that experimental data are basically identical with the simulation results, which demonstrates the validity of the proposed numerical simulation method. Findings The results demonstrate that the oil film temperature decreases and the oil film pressure first increases and then decreases with an increase in the recess depth, but oil film velocity is constant. To sum up comprehensive lubrication performance, the recess depth of 3.5 mm is its optimal value for the annular recess hydrostatic thrust bearing. Originality/value The computed results indicate that to get an improved performance from a constant flow hydrostatic thrust bearing, a proper selection of the recess depth is essential.

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.

Dynamic Autonomous Car Mobile Analysis Simulating Mechanical Systems Analysis – First Dynamic Characteristics of Running Mouse –

1998 ◽  
Vol 10 (6) ◽  
pp. 488-493
Author(s):  
Shigeki Toyama ◽  
◽  
Yasuo Murakuki
Keyword(s):  
Dynamic Characteristics ◽  
Systems Analysis ◽  
Tracking Control ◽  
Mechanical Systems ◽  
Dc Motor ◽  
Path Tracking ◽  
Running Performance ◽  
Tire Force ◽  
Simulation Results

This paper dynamically simulates a small running 2DW2C automobile (mouse) and simulates path tracking control. Our purpose was to optimize mouse design using simulation results. We added tire force and DC motor force to A1 Motion, a simulator for analyzing mechanical systems developed in our laboratory, and improved the simulator simulating a running automobile. Experiments with a small 2DW2C automobile compared experimental and simulation results involving dynamic characteristics of an actual mouse. We got correct simulation results using this model and simulator. We studied its running performance, affected by its wheelbase and caster length, and evaluated path tracking control using closoidal curves.

Image Segmentation Arithmetic Based on Narrow Band C-V

2010 ◽  
Vol 108-111 ◽  
pp. 1338-1343
Author(s):  
Xiao Hu Lv ◽  
Yong Xin Liu
Keyword(s):  
Image Segmentation ◽  
Level Set ◽  
Narrow Band ◽  
Segmentation Algorithm ◽  
Computational Method ◽  
Computation Complexity ◽  
Iterative Computation ◽  
Iterative Calculation ◽  
Simulation Results

The characters of C-V model are analyzed in this paper. Using the C-V technique to segment objects from an image, every pixel of whole image needed to be updated in each iterative calculation. The amount of iterative calculation is very large. So a computational method combine C-V model with the narrow band of level set is proposed. The segmentation iterative computation is defined on a narrow band, so the computation complexity is gotten lower. This segmentation algorithm is simulated in MATLAB. The simulation results shows that this segment arithmetic is efficiency, constringency fast and can get object integrally.

Hydrodynamic Characteristics of Dislocated Floating Ring Bearing with Different Eccentricities

2011 ◽  
Vol 52-54 ◽  
pp. 152-155
Author(s):  
Yu Jie Dai
Keyword(s):  
Numerical Simulation ◽  
Boundary Element Method ◽  
Internal Friction ◽  
Boundary Element ◽  
Hydrodynamic Characteristics ◽  
Ring Radius ◽  
Simulation Results ◽  
Element Method

For obtain the effect of floating ring radius R2 and floating ring velocity v2 on internal friction in dislocated floating ring with different eccentricities, the evolution of internal friction is simulated with boundary element method (BEM). Numerical simulation results show that internal friction increases with the increase of eccentricity. Internal friction rises linearly as the addition of floating ring velocity v2 if the eccentricity e and radius R2 are fixed. When the velocity v2 is a constant and the range of R2 is 0.75<R2<0.8, the internal friction increase enormously.

Hydrodynamic Interaction of Ice Sheet and a Floating Platform

2016 ◽  
Author(s):  
Aziz Ahmed ◽  
Mohammed Abdul Hannan ◽  
Xudong Qian ◽  
Bai Wei
Keyword(s):  
Model Test ◽  
The Arctic ◽  
Wave Direction ◽  
Hydrodynamic Behavior ◽  
Incoming Wave ◽  
Hydrodynamic Analysis ◽  
Hydrodynamic Response ◽  
Level Ice ◽  
Ice Floes ◽  
Multi Body

Arctic is the one of the final frontiers in the field of oil and gas exploration. It is also a potential source of the vast amount of renewable energy using wind turbines and wave energy converters. Floating platforms hold certain advantages over fixed platforms for such harsh environment, as they allow disconnection and reconnection in the event of large icebergs or vast multi-year ice floes. They are also commercially attractive as they allow redeployment in other regions during the Arctic off-peak periods. However, such platforms will still need to encounter and withstand first-year level ice of varying sizes and from different directions. Such large ice floes will interfere with the hydrodynamic response of the floater. The hydrodynamic analysis of an isolated floater without accounting for the effect of the level ice is incomplete and may result in a un-conservative prediction of the floater’s response. The lack of any simple methodology to account for the effect of level ice on the hydrodynamic behavior of the floater is the motivation behind this study. This study aims to identify the most relevant parameters affecting the multi-body hydrodynamic behavior of level ice and a single floater. A standard semi-submersible represents the floater, and a range of geometric variations of the level ice simulates the varying nature of the ice environment encountered by the floaters in the Arctic. This study validates the hydrodynamic analysis procedure against model test on an ice floe and wave interaction. The calibration of the model test provides the damping coefficient required for the frequency domain, multi-body hydrodynamic model. This investigation varies the ice orientation and distance from the floater for a detailed parametric study employing the calibrated model. Current research finds that the presence of a comparably sized level ice floe near the floater significantly influences the hydrodynamic Response Amplitude Operator (RAO) of the floater. It can diminish the RAOs in some degree of freedom while enhancing the RAOs in other degree of freedoms. This study identifies the wave direction, ice floe distance, ice floe orientation as the most important parameters. Sway and pitch motion of the floater experienced the most enhancements due to the presence of level ice floe along the incoming wave direction. Additionally, this study proposes some initial upper bound values to account for the effect of level ice floes on the RAOs generated from a single body hydrodynamic analysis.

Sign in / Sign up

Export Citation Format

Share Document