scholarly journals Installation for experimental study of wear of sliding contact "contact wire – lining"

2017 ◽  
Vol 0 (14) ◽  
Author(s):  
D. Ustymenko
Keyword(s):  
Experimental Study ◽  
Sliding Contact ◽  
Contact Wire

scholarly journals AN EXPERIMENTAL STUDY ON THIRD-BODY PARTICLE TRANSPORT IN SLIDING CONTACT

2021 ◽  
Vol 19 (1) ◽  
pp. 001
Author(s):  
Qiang Li ◽  
Iakov A. Lyashenko ◽  
Jasminka Starcevic
Keyword(s):  
Experimental Study ◽  
Particle Transport ◽  
Tangential Force ◽  
Sliding Contact ◽  
Pure Form ◽  
Third Body ◽  
Rubber Layer ◽  
The Third ◽  
Rough Body ◽  
3D Printed

An experiment is designed to study the third-body particle transport in a rough contact. To study the influence of particles in a pure form, it is assured that the first bodies have no contact and the sliding is very slow, so that the process can be considered as quasistatic. An example of sliding contact of a 3D printed “rough body” on small spheres artificially located on a rubber layer is presented. The trajectory of particles during the sliding is captured for studying their movement and the correlation to the fluctuation of normal and tangential force.

scholarly journals Thermal modes of operation of power-current contact of electric transport during conduct of bench tests

2021 ◽  
pp. 17-24
Author(s):  
А.М. Mukha ◽  
D.V. Ustymenko ◽  
Mohammad Al Said Ahmad Diab
Keyword(s):  
Electric Vehicles ◽  
Test Bench ◽  
Heating Time ◽  
Sliding Contact ◽  
Rolling Stock ◽  
Final Test ◽  
Relative Temperature ◽  
Bench Tests ◽  
Contact Wire ◽  
Test Result

Purpose. Analysis of the results of bench tests of sliding electrical contacts of electric vehicles, in order to determine the thermal regime of the sliding contact. Methodology. The initial data were obtained during field experiments on a specialized stand in the laboratory, which were carried out to determine the wear of the contact wire inserts of different types for pantographs of electro-rolling stock of railways. To determine the contact wire temperature at the place of sliding contact, a non-destructive non-contact method of control using a thermal imager was used. Findings. During the experimental part of the research, the  thermal imaging photographs were obtained, they recorded the temperatures at the place of sliding contact between the insert of the pantograph of the electric rolling stock and the contact wire installed on the test disk. These temperature values were recorded with a certain time interval, which allowed to build the dependences of changes in thermal regime over time, to determine the heating time constant of the "insert-contact wire" of the test bench and to obtain the final temperature value at the end of tests. Accepting the insert sample in which the minimum temperature in the area of sliding contact is as a reference, it becomes possible by the value of the temperature of the contact wire in the area of sliding contact to predict the final test result of other types of pads. Originality. Indicators of temperature modes of sliding contact of electric vehicles during bench tests are obtained for the first time, the proposed relative temperature indicator allows to predict the results of bench tests of qualitative indicators of sliding contact of electric vehicles.. Practical value. Bench tests of inserts of current collectors of electric vehicles are a long procedure, the normative indicator of the number of passes of the current collector on the stand is equal to 500 thousand passes, which requires significant expenditure of time, energy, human resources and others. The indicators proposed according to the test results, namely the heating time constant and the relative temperature index, allow to carry out two-stage tests. At the first stage, with a duration of 10 thousand revolutions of the test bench disk, the proposed indicators are determined and compared with the corresponding reference, in case of their compliance it becomes possible to predict the final test result as successful (contact wire wear less than normal) or unsuccessful. In the latter case, the need for the second stage of testing up to 500 thousand revolutions is questionable, because the end result will be negative, and the significant resources will be involved in the test, and therefore these tests are impractical.

Experimental study of thermal sliding contact parameters at interface seat of large strains

2010 ◽  
Vol 3 (S1) ◽  
pp. 821-824 ◽  
Author(s):  
B. Bourouga ◽  
E. Guillot ◽  
B. Garnier ◽  
L. Dubar
Keyword(s):  
Experimental Study ◽  
Sliding Contact ◽  
Large Strains ◽  
Contact Parameters

Paper 21: Measurements of Friction and Wear under Conditions of Dynamic Excitation

1967 ◽  
Vol 182 (14) ◽  
pp. 175-182
Author(s):  
K. Barker ◽  
H. Kaliszer ◽  
G. W. Rowe
Keyword(s):  
Experimental Study ◽  
Shear Strength ◽  
Friction And Wear ◽  
Sliding Contact ◽  
Impulsive Force ◽  
Metal Interface ◽  
Heavy Load ◽  
Dynamic Excitation ◽  
Interfacial Contact ◽  
Steel Disc

An experimental study is being made of the friction and wear of pins of different materials in sliding contact with a rotating mild steel disc. A load is applied by dead weights and the excitation is introduced either by out-of-balance in the wheel or by an electromechanical vibrator attached to the loading arm. Stepless speed variation up to 60 ft/s is provided. The friction force, temperature, and worn volume are recorded continuously. Under light loads a synchronous impulsive force appears to decrease the shear strength of the lubricant–metal interface, whereas under a heavy load it does not have a significant effect on the interfacial contact. Synchronous vibrations alter the wear pattern of a phosphor-bronze pin. The running-in period is extended, but the final wear rate is greater. Changes in the running-in characteristics of a steel pin are not observed.

Heat Modeling of the Catenary’s Contact Wire During the Electrical Power Supply of Trains in Station

2014 ◽  
Author(s):  
Thomas Bausseron ◽  
Philippe Baucour ◽  
Raynal Glises ◽  
Sylvain Verschelde ◽  
Didier Chamagne
Keyword(s):  
Experimental Study ◽  
Heat Flux ◽  
Heat Conduction ◽  
Heat Exchange ◽  
Numerical Model ◽  
Thermal Resistance ◽  
Power Supply ◽  
Electrical Power ◽  
Contact Wire ◽  
Interface Heat

The overheating problem of the railroad catenary at the contact with the pantograph when the train is stopped and electrically fed is responsible of many incidents. This paper describes an experimental study and a numerical model of a catenary/pantograph system used during the preconditioning of the train. Several incidents of wire breakage have highlighted the importance of the catenary/pantograph heating problem, in those incidents the contact wire had melted and broke itself. The experimental setups consists of estimating the contact’s thermal resistance and area in order to calculate which part of the interface heat flux go throught the catenary’s contact wire and which part go throught the pantograph’s collector strip. The numerical model is based on several phenomena as heat conduction into the wires, heat exchange with ambiance through convection, Joule effects and heat flux from the interface.

scholarly journals The mobile tribotester design in roller-block and roller-roller system using in sliding and rolling-sliding contact

Mechanik ◽  
2018 ◽  
Vol 91 (1) ◽  
pp. 42-44
Author(s):  
Henryk Bąkowski ◽  
Zbigniew Stanik ◽  
Marek Jasiok
Keyword(s):  
Experimental Study ◽  
High Pressure ◽  
Surface Layer ◽  
Low Temperatures ◽  
Sliding Contact ◽  
Operational Conditions ◽  
Roller System

The paper presented an experimental study to estimation surface layer wear in sliding and rolling-sliding contact using in different operational conditions of study, such as extremely low temperatures, low or high pressure, presence of lubricant or sand whether high rotational speeds.

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