An Experimental Hydrodynamic Thrust Bearing Device and Its Application to the Study of a Tapered-Land Thrust Bearing

2014 ◽  
Vol 136 (2) ◽  
Author(s):  
Y. Henry ◽  
J. Bouyer ◽  
M. Fillon
Keyword(s):  
Experimental Study ◽  
Thrust Bearing ◽  
Active Surface ◽  
Friction Torque ◽  
Experimental Results ◽  
Hydrodynamic Behavior ◽  
Thrust Bearings ◽  
Surface Polishing ◽  
Pressure Peak ◽  
Good Agreement

An experimental study is presented with the main objective of understanding the hydrodynamic behavior of a tapered-land thrust bearing with fixed geometry. The experimental results were obtained using an original test rig designed at the “Institut Pprime.” Extensive instrumentation applied to the thrust bearing allows a precise evaluation of various characteristics such as the temperature, the film thickness and the friction torque. The results are in good agreement with the findings of other surveys in the literature. However, large differences between the measured parameters were observed from one pad to another. The authors demonstrate that this is due to the imperfections on the active surface, produced during machining. For a better understanding of the influence of irregularities in the flatness, the test was repeated with a thrust bearing manufactured using a high-precision surface polishing process. Experimental results with respect to the real geometry of the bearings were presented with both processes being compared. Interesting features, such as hot spots and a pressure peak, were identified on the pad at different supply temperatures and inlet pressures. This experimental study significantly advances the comprehension of the hydrodynamic behavior of tapered-land thrust bearings.

Experimental Investigation in a Hydrodynamic Taper Land Thrust Bearing

2012 ◽  
Author(s):  
Y. Henry ◽  
J. Bouyer ◽  
M. Fillon
Keyword(s):  
Experimental Study ◽  
Experimental Investigation ◽  
Film Thickness ◽  
Thrust Bearing ◽  
Active Surface ◽  
Friction Torque ◽  
Test Rig ◽  
Hydrodynamic Behavior ◽  
Precise Evaluation ◽  
Good Agreement

An experimental study is presented with the main objective of understanding the hydrodynamic behavior of a taper land thrust bearing with fixed geometry. The experimental results were obtained on an original test rig designed at the Pprime Institute. An extensive instrumentation of the thrust bearing allows a precise evaluation of various elements such as the temperature, the film thickness or the friction torque. The results are in good agreement with other literature surveys. However, an important difference of the measured parameters was found between the pads. The authors consider that this is most probably caused by the imperfections of the active surface produced during machining.

An Experimental Study on Externally Pressurized Supersonic Gas Thrust Bearings

1985 ◽  
Vol 107 (1) ◽  
pp. 122-127 ◽  
Author(s):  
Yutaka Miyake ◽  
Takehiko Inaba ◽  
Naoshige Kubo ◽  
Jun-ichi Takeoka
Keyword(s):  
Experimental Study ◽  
Flow Rate ◽  
Load Capacity ◽  
Experimental Results ◽  
Static Characteristics ◽  
Thrust Bearings ◽  
Pressure Distributions ◽  
Theoretical Predictions ◽  
New Type ◽  
Good Agreement

Externally pressurized supersonic gas thrust bearings whose generation of load capacity is substantially independent of the viscosity of working fluids, have been proposed and analyzed by the authors. This report presents the experimental results of the static characteristics of this new type of bearings. The experimental results including load capacity, stiffness, mass flow rate, and pressure distributions in the bearing clearance, generally show a good agreement with the theoretical predictions and verify the validity of this new bearing. The effect of an orifice to improve the stiffness is also examined. Some problems which should be solved to put the bearing in practical use are pointed out.

scholarly journals Inlet and Exit-Header Shapes for Uniform Flow Through a Resistance Parallel to the Main Stream

1961 ◽  
Vol 83 (3) ◽  
pp. 361-368 ◽  
Author(s):  
Morris Perlmutter
Keyword(s):  
Experimental Study ◽  
Pressure Drop ◽  
Total Pressure ◽  
Experimental Results ◽  
Main Stream ◽  
Height Ratio ◽  
Large Length ◽  
Flow Through ◽  
Pass Through ◽  
Good Agreement

An analytical and experimental study of flow in headers with a resistance parallel to the turbulent and incompressible main stream has been made. The purpose was to shape the inlet and exit headers, which had a large length-to-height ratio, so that the fluid would pass through the resistance uniformly. Analytical wall shapes and estimated total pressure drop through the headers were compared with experimental results. Good agreement between analysis and experiment was found for the cases compared.

Rotordynamic and Bearing Upgrade of a High-Speed Turbocharger

2002 ◽  
Vol 125 (1) ◽  
pp. 95-101 ◽  
Author(s):  
B. C. Pettinato ◽  
P. DeChoudhury
Keyword(s):  
High Speed ◽  
Thrust Bearing ◽  
Load Capacity ◽  
Journal Bearings ◽  
Experimental Results ◽  
Thrust Bearings ◽  
Vibration Data ◽  
Oil Leakage ◽  
Bearing Life ◽  
Thrust Load

The paper discusses the redesign of a high-speed turbocharger for improved bearing life and mechanical operation. The bearings were changed from a pair of combination journal/thrust bearings to a pair of redesigned journal bearings with double acting thrust bearing at the center of the unit. Internal oil passages, drain cavities, and seals were also revised. These modifications resulted in reduced oil leakage across end seals, reduced coke buildup at the turbine, increased thrust load capacity, and improved rotordynamics. Both the analytical and experimental results, which consisted of bearing performance and vibration data of original and modified systems are presented.

Paper 17: A Self-Acting Parallel Surface Thrust Bearing

1967 ◽  
Vol 182 (14) ◽  
pp. 139-146 ◽  
Author(s):  
A. H. Bennett ◽  
C. Ettles
Keyword(s):  
Thrust Bearing ◽  
Flat Surface ◽  
Operating Conditions ◽  
Superior Performance ◽  
Land Type ◽  
Thrust Bearings ◽  
Parallel Surface ◽  
Analysis Design ◽  
Design And Testing ◽  
Good Agreement

This paper describes the analysis, design, and testing of a one-piece hydrodynamic thrust bearing with an initially flat surface, which has a performance similar to conventional pivoted pad thrust bearings. The leading portion of each pad is undercut allowing it to deflect elastically under load and form a wedge-shaped film. Analysis of the configuration used is particularly simple and gives good agreement with experimental results. This cantilever bearing is compared quantitatively with the plain land type and is shown to have a greatly superior performance. Comprehensive instrumentation mounted in both the rotor and the bearing gave an accurate account of the operating conditions.

An Optimum Design Approach for Textured Thrust Bearing With Elliptical-Shape Dimples Using CFD and DOE Including Cavitation

2016 ◽  
Author(s):  
Gen Fu ◽  
Alexandrina Untaroiu
Keyword(s):  
Reynolds Equation ◽  
Thrust Bearing ◽  
Major Axis ◽  
Friction Torque ◽  
Load Force ◽  
Surface Model ◽  
Temperature Threshold ◽  
Optimization Approach ◽  
Loading Capacity ◽  
Thrust Bearings

Surface texturing has been used to enhance contact performance for decades since 1960s. Surface structures can tremendously change the friction coefficient of the contact surface. These structures have been widely used in bearings and seals. According to previous studies, textured thrust bearings provide more loading capacity than non-textured bearings. Compared to tapered and step bearings, the dimples can also reduce the friction torque. However, most previous optimization efforts for texturing geometry were focused on rectangular dimples and employed Reynolds equation. Limited studies have been done to investigate the effects of partially textured thrust bearings with elliptical dimples. This study proposes a new optimization approach to find the optimal partially texture geometry with elliptical dimples, which maximize the loading capacity and minimize the friction torque. In this study, a 3D computational fluid dynamics model for a parallel sector-pad thrust bearing is built using ANSYS CFX software instead of solving Reynolds equation with simplified field assumptions. Only one sector of the thrust bearing is modeled. Mass conserving cavitation model is used to simulate the cavitation region inside the dimples. Energy equation for Newtonian flow is also solved. Realistic boundary conditions are applied. The results of the model are validated by the experimental data from the literature. Based on this model, the flow pattern and pressure distribution inside the dimples are analyzed. Then, the geometry of elliptical dimple is parameterized and analyzed using the method of design of experiments (DOE). In this study, all the dimples have identical geometry. The selected geometry parameters include the length of major axis, the length of minor axis, dimple depth, circumferential space between two dimples, radial space between two dimples, radial extend and circumferential extend. The design space is sampled using central composite method. A temperature threshold is set to exclude the design points which result in high temperatures. A quadratic response surface model is created based on the results of the DOE process. Next, a multi-objective optimization scheme is used to find the optimal texture structure with the load force and friction torque set as objective functions. The results show that the shape of dimples has a crucial effect on the performance of the textured thrust bearings. This optimization approach proposed is expected to be useful in typical texture design process of thrust bearing.

Evaluating Thermal Performance of a PTFE-Faced Tilting Pad Thrust Bearing

2003 ◽  
Vol 125 (2) ◽  
pp. 319-324 ◽  
Author(s):  
Sergei B. Glavatskih
Keyword(s):  
Thrust Bearing ◽  
Friction Torque ◽  
Outer Diameter ◽  
Test Results ◽  
Operating Characteristics ◽  
Thrust Bearings ◽  
Ptfe Composite ◽  
Temperature Distributions ◽  
Tilting Pad ◽  
Bearing Friction

This paper compares and analyses operating characteristics of equalizing tilting pad thrust bearings with babbitt and polytetrafluoroethylene (PTFE) composite facings. Each bearing arrangement included six pads with an outer diameter of 228.6 mm and 60 percent offset. The babbitted bearing was typical of design in general use. A PTFE composite was applied instead of the babbitt to a similar bearing. Bearings were tested at different load-speed combinations in the fully flooded mode. Pad temperature distributions, collar temperatures and bearing friction torque were continuously measured. Test results show that the PTFE composite provides excellent thermal insulation so that pad thermal crowning is eliminated. PTFE-faced bearings operate with lower power loss and slightly higher collar temperatures compared to similar babbitted bearings.

scholarly journals Numerical And Experimental Study Of Producing Flanges On Hollow Parts By Extrusion With A Movable Sleeve

2015 ◽  
Vol 60 (3) ◽  
pp. 1917-1922 ◽  
Author(s):  
A. Gontarz ◽  
G. Winiarski
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Failure Modes ◽  
Experimental Results ◽  
New Method ◽  
Special Device ◽  
The Finite Element Method ◽  
Forming Process ◽  
Forging Press ◽  
Good Agreement

Abstract The paper presents the numerical and experimental results of a new method for producing flanges on hollow parts. With this new method, the flange is extruded by a movable sleeve. This innovative technique is modelled numerically by the finite element method. The effect of workpiece and finished product geometries on the forming process is investigated and failure modes are identfied. The numerical reults are then verified in experiments. The tests are conducted using a three-slide forging press equipped with a special device. The numerical and experimental results show a good agreement, which proves that the developed method is correct.

scholarly journals Numerical and Experimental Study of Producing Flanges on Hollow Parts by Extrusion with a Movable Sleeve / Badania Teoretyczno-Doświadczalne Procesu Wyciskania Z Zastosowaniem Ruchomej Tulei Kołnierza We Wsadach Drążonych

2015 ◽  
Vol 60 (4) ◽  
pp. 2733-2738
Author(s):  
A. Gontarz ◽  
G. Winiarski
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Failure Modes ◽  
Experimental Results ◽  
New Method ◽  
Special Device ◽  
The Finite Element Method ◽  
Forming Process ◽  
Forging Press ◽  
Good Agreement

The paper presents the numerical and experimental results of a new method for producing flanges on hollow parts. With this new method, the flange is extruded by a movable sleeve. This innovative technique is modelled numerically by the finite element method. The effect of workpiece and finished product geometries on the forming process is investigated and failure modes are identfied. The numerical reults are then verified in experiments. The tests are conducted using a three-slide forging press equipped with a special device. The numerical and experimental results show a good agreement, which proves that the developed method is correct.

Sign in / Sign up

Export Citation Format

Share Document