Wear Analysis Using a Quick Stop Device

Purpose Fretting wear takes place when two contacting solid surfaces are subjected to relatively small amplitude oscillatory motion in the order of a few microns. The purpose of this paper is the design and manufacture of a fretting wear test rig that can analyze fretting wear on journal bearings. Design/methodology/approach This study included the manufacturing and operating principles of the test rig. In the test rig, the shaft was fixed and vibrational motion was given to the bearing housing. Vibration motion the amplitude of which could be adjusted was used on the test rig. The vibration motion was applied to a two-piece journal bearing on a fixed shaft supported from both ends. Findings Vibration amplitude was provided by a micro vibration engine (motor) to be under 100 μm. Originality/value Also, scanning electron microscopy, energy dispersive X-ray and X-ray diffraction analyses of the samples were investigated.

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Dynamic Modeling and Validation of a Lorentz, Self-Bearing Motor Test Rig

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.1499731 ◽

2002 ◽

Vol 125 (1) ◽

pp. 156-166 ◽

Cited By ~ 3

Author(s):

L. S. Stephens ◽

D.-G. Kim

Keyword(s):

Dynamic Model ◽

Permanent Magnets ◽

Transfer Functions ◽

System Model ◽

Test Rig ◽

Motor Test ◽

Three Phase ◽

New Type ◽

Bearing Force ◽

Good Agreement

A new type of self-bearing motor that uses Lorentz-type forces to generate both bearing force and motoring torque has been developed. The motor stator is of slotless construction with four three-phase windings. The motor rotor is constructed of 16 surface mounted permanent magnets (PM’s). The main advantage of the design is that it eliminates the tradeoff between motoring torque and bearing force with PM thickness as found in previous designs. This paper presents the dynamic model for the self-bearing motor and illustrates how the model is integrated into the overall system model of the motor test rig. The dynamic model is validated against experimentally measured transfer functions with good agreement between the two.

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Design and Numeric Simulation of a Thermoacoustic Bi-Directional Turbine Test Rig

Volume 2C: Turbomachinery ◽

10.1115/gt2019-92009 ◽

2019 ◽

Cited By ~ 1

Author(s):

Dongdong Liu ◽

Yanyan Chen ◽

Wei Dai ◽

Ercang Luo

Keyword(s):

Acoustic Field ◽

Large Scale ◽

Three Dimensional ◽

Typical Result ◽

Test Rig ◽

Impulse Turbine ◽

Power Generators ◽

Numeric Simulation ◽

Shaft Power ◽

New Type

Abstract As a new type of acoustic-electric conversion method, bi-directional impulse turbine provides great potential for developing large scale and economic thermoacoustic power generators. A test rig for turbine tests in acoustic fields, which are provided through two reciprocating pistons, has been introduced. A three-dimensional numerical model has been used to simulate the whole system. The fundamental characteristics of the turbine in oscillating flow are analyzed. Impact of acoustic field features on the turbine performance has been studied. The results show that the performance is sensitive to the acoustic field. For the test rig, a typical result is that with a shaft power of 187 W, the turbine can reach an efficiency around 32%.

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A Technique for the Detection of Liquid Slip at a Load-Bearing, High Shear Contact

World Tribology Congress III, Volume 2 ◽

10.1115/wtc2005-64269 ◽

2005 ◽

Author(s):

J. H. Choo ◽

H. A. Spikes ◽

M. Ratoi ◽

R. P. Glovnea ◽

A. Forrest

Keyword(s):

High Speed ◽

Physical Phenomenon ◽

Solid Surfaces ◽

The Other ◽

Plasma Cleaning ◽

High Shear ◽

Test Rig ◽

Simple Liquids ◽

New Type ◽

O2 Plasma

This research aims to exploit the physical phenomenon of simple liquids slipping against very smooth solid surfaces, to create a new type of bearing where the lubricant slips against one surface but not the other. To demonstrate the feasibility of this idea, a special test rig capable of measuring milli-Newton forces has been employed to measure friction in high-speed, sliding contacts between a steel roller and sapphire window, lubricated by hexadecane. Sapphire was made either lyophobic by coating with a self-assembled silane monolayer, or lyophilic by O2-plasma cleaning. The roller was made lyophilic. A significant reduction in friction was achieved with lyophobic sapphire but not with lyophilic sapphire. This reduced friction is believed to result from lubricant slip against the lyophobic surface. One possible application of such a bearing will be in microsystems and devices.

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Analysis of Failure Modes of a Thermoplastic One-Way Clutch

Proceedings of the Institution of Mechanical Engineers Part C Mechanical Engineering Science ◽

10.1243/pime_proc_1991_205_111_02 ◽

1991 ◽

Vol 205 (3) ◽

pp. 209-215 ◽

Cited By ~ 1

Author(s):

S C Burgess ◽

T A Stolarski ◽

S Karp

Keyword(s):

Experimental Test ◽

Failure Modes ◽

Power Transmission ◽

Experimental Results ◽

Test Rig ◽

New Type ◽

Experimental Test Rig

This paper presents an analysis of the failure modes during power transmission of a new type of one-way clutch called an expansible-band clutch. The new clutch is made from thermoplastic materials and an experimental test rig has been used to test two material combinations to failure. The experimental results are compared with predictions obtained from empirical formulae. The differences in the two sets of results are used to make conclusions about the failure processes.

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A TRIBOLOGICAL TEST RIG FOR FIBRES, CABLES, AND PLAITINGS

Tribologia ◽

10.5604/01.3001.0010.6363 ◽

2018 ◽

Vol 271 (1) ◽

pp. 51-55

Author(s):

Piotr KOWALEWSKI ◽

Anna BROŃCZYK ◽

Wojciech WIELEBA

Keyword(s):

Control Systems ◽

Friction And Wear ◽

Machine Design ◽

Testing Device ◽

Test Rig ◽

Tribological Test ◽

Measurement Systems ◽

Innovative System ◽

New Type ◽

And Control

The paper presents a description of the mechanical construction, measuring and control systems and the possibilities of a new type tribological testing device. The design was developed and built at the Department of Fundamentals of Machine Design and Tribology of Wroclaw University of Science and Technology. Described tester allows the investigate a friction and wear of components such as fibrous tapes, ropes, plaitings or fibers themselves in contact with solid materials. The paper describes in detail the construction of drive and the load pneumatic system. The innovative system of the device such measurement equipped with piezoelectric sensors and an experimental fixing unit of tested components also have been described. Work includes diagrams of used control and measurement systems and the central lubrication system. As a test the polyethylene cable in contact with brass rods has been examined. The results of this studies were been also presented in the paper.

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Effects of Lubrication on the Wear Parameters of Metals Using Pin-on-Disk Test Rig

Advances in Research ◽

10.9734/air/2019/v18i530103 ◽

2019 ◽

pp. 1-12

Author(s):

C. F. Onyeanusi ◽

S. C. Nwigbo ◽

N. B. Anosike ◽

C. A. Nwajude

Keyword(s):

Friction And Wear ◽

Palm Kernel ◽

Frictional Coefficient ◽

Wear Test ◽

Test Rig ◽

Wear Pattern ◽

The Coefficient Of Friction ◽

Pin On Disk ◽

Disk Test

Friction and wear control of movable parts in machines remain a critical challenge in the industries. Determination of measurement to control this often involves both the material and the lubricant. A wear test experiment using pin-on-disk apparatus to determine the wear pattern on a sample of aluminium and copper materials, lubricated with vegetable oil of palm kernel origin was conducted. Wear parameters, which include frictional coefficient, wear rate, and heat generation (temperature) were evaluated alongside thermal stress-strains on the pin on disk. Results showed that under the same conditions, the coefficient of friction reduces with the application of lubricant up to 84% and 7% for aluminium and copper respectively. The wear pattern for both materials when lubricated were evaluated and compared with dry condition to establish the relationships.

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