scholarly journals THEORETICAL DEPENDENCE OF WEAR VALUE OF FRICTION PAIR «CENETR PLATE – CENTER PAD» ON A FREIGHT CAR MILEAGE

2017 ◽  
Vol 0 (6(72)) ◽  
pp. 61-69
Author(s):  
L. A. Muradian ◽  
D. O. Podosenov ◽  
V. Y. Shaposhnyk
Keyword(s):  
Friction Pair ◽  
Theoretical Dependence ◽  
Freight Car ◽  
Plate Center

Increasing the life of the center plate-center bowl friction unit of a freight car by applying a combined coating formed by electrospark alloying

2021 ◽  
pp. 70-73
Author(s):  
Keyword(s):  
Operational Reliability ◽  
Friction Unit ◽  
Electrospark Alloying ◽  
Railway Transport ◽  
Antifriction Coating ◽  
Friction Units ◽  
Freight Car ◽  
Combined Coatings ◽  
Plate Center

An increase in the operational reliability of friction units of railway transport by applying antifriction combined coatings formed by electrospark alloying, which ensures their greater strength and adhesion to metal, is considered. Keywords: electrospark alloying combined antifriction coating, strength, adhesion. [email protected]

A Study of Driving evaluation factors for Introducing UBI to freight car

2016 ◽  
Author(s):  
GeomGeun Yoo ◽  
◽  
Jong-Un Won ◽  
YongJang Kwon ◽  
Jaewon Kim ◽  
...  
Keyword(s):  
Freight Car

On the Theoretical Dependence of Correspondence Postulates

1971 ◽  
Vol 38 (2) ◽  
pp. 170-177 ◽  
Author(s):  
James Child
Keyword(s):  
Theoretical Dependence

scholarly journals Analytical Determination of the Brake Temperature Mode During Repetitive Short-Term Braking

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1912
Author(s):  
Aleksander Yevtushenko ◽  
Katarzyna Topczewska ◽  
Michal Kuciej
Keyword(s):  
Friction Pair ◽  
Thermal Sensitivity ◽  
Finite Difference Methods ◽  
Temporal Variations ◽  
Frictional Heat ◽  
Maximum Temperature ◽  
Analytical Determination ◽  
Flash Temperature ◽  
Short Term ◽  
The One

An algorithm to determine the maximum temperature of brake systems during repetitive short-term (RST) braking mode has been proposed. For this purpose, the intermittent mode of braking was given in the form of a few cyclic stages consisting of subsequent braking and acceleration processes. Based on the Chichinadze’s hypothesis of temperature summation, the evolutions of the maximum temperature during each cycle were calculated as the sum of the mean temperature on the nominal contact surface of the friction pair elements and temperature attained on the real contact areas (flash temperature). In order to find the first component, the analytical solution to the one-dimensional thermal problem of friction for two semi-spaces taking into account frictional heat generation was adapted. To find the flash temperature, the solution to the problem for the semi-infinite rod sliding with variable velocity against a smooth surface was used. In both solutions, the temperature-dependent coefficient of friction and thermal sensitivity of materials were taken into account. Numerical calculations were carried out for disc and drum brake systems. The obtained temporal variations of sliding velocity, friction power and temperature were investigated on each stage of braking. It was found that the obtained results agree well with the corresponding data established by finite element and finite-difference methods.

scholarly journals Analysis and Comparative Assessment of Basic Tribological Properties of Selected Polymer Composites

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 75 ◽  
Author(s):  
Jerzy Jozwik ◽  
Krzysztof Dziedzic ◽  
Marcin Barszcz ◽  
Mykhaylo Pashechko
Keyword(s):  
Polymer Composites ◽  
Friction Force ◽  
Tribological Properties ◽  
Friction Pair ◽  
Computer Software ◽  
Operating Conditions ◽  
The Coefficient Of Friction ◽  
Cast Polyamide ◽  
Friction Path ◽  
Materials Used

Phenomena occurring in the contact area between two mating bodies are characterised by high complexity and variability. Comparisons are usually made between parameters such as the coefficient of friction, friction force, wear and temperature in relation to time and friction path. Their correct measurement enables the proper evaluation of tribological properties of materials used in the friction pair. This paper concerns the measurements of basic tribological parameters in the friction of selected polymer composites. Knowing the tribological properties of these composite materials, it will be possible to create proper operating conditions for kinematic friction pairs. This study investigated the coefficients of friction, friction force and temperatures of six polymer composites: cast polyamide PA6 G with oil, PA6 G with MoS2, polyoxymethylene POM with aluminium, polyethylene terephthalate PET with polytetrafluoroethylene PTFE, PTFE with bronze, and PTFE with graphite. The friction surface was also examined using an optical system and computer software for 3D measurements. As a result, PA6-G with oil was found to be the best choice as a composite material for thin sliding coatings.

Minimization of contact pressure for hub–shaft friction pair

2015 ◽  
Vol 36 (5) ◽  
pp. 404-408 ◽  
Author(s):  
V. M. Mirsalimov ◽  
P. E. Akhundova
Keyword(s):  
Contact Pressure ◽  
Friction Pair ◽  
Shaft Friction
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