scholarly journals The performance evaluation of heavy loaded tribosystems with vacuum ion-plasma PVD and DLC coatings

2021 ◽  
Vol 2131 (2) ◽  
pp. 022041
Author(s):  
V Kolesnikov ◽  
D Manturov ◽  
I Kolesnikov
Keyword(s):  
Test Bench ◽  
Tooth Wear ◽  
Friction Unit ◽  
Dlc Coatings ◽  
Bench Tests ◽  
Ion Plasma ◽  
Mechanical And Tribological Characteristics ◽  
Continuous Indentation ◽  
Derivatives Of ◽  
Applied Purpose

Abstract The results of studies of the physical, mechanical and tribological characteristics of PVD and DLC coatings are presented. The complex of basic mechanical properties (hardness H and elastic modulus E), as well as derivatives of mechanical characteristics H/E and Н3/Е2 , were investigated by the method of continuous indentation at various loads. The friction coefficient, the wear rate of the sample and the counterbody were determined as tribological indicators. The applied purpose of the work was to determine the friction unit for applying the developed coatings, materials and modes of applying PVD and DLC coatings. To solve this problem, a test bench was designed and built that simulates the operation of the selected friction unit. As a result of the research carried out, the results of laboratory and bench tests were compared. The performance of the coatings was determined by the volume of the tooth wear of the sleeve and the tip with the help of the method of micrometric measurements. As a result of the study of the surface morphology, the volumes of wear of rubbing conjugations and the intensity of their wear were determined. It has been established that the results of bench tests confirm laboratory studies and suggest that such an installation can be used for researching other heavily loaded spline conjugations.

Formation of Gradient Multiphase Nanostructured Surface Layers Using the Electron-Ion-Plasma Combined Method

2015 ◽  
Vol 756 ◽  
pp. 236-242 ◽  
Author(s):  
Yuriy F. Ivanov ◽  
Anton D. Teresov ◽  
Olga V. Ivanova ◽  
Victor E. Gromov ◽  
Evgeniy A. Budovskikh ◽  
...  
Keyword(s):  
Titanium Alloy ◽  
Subsequent Treatment ◽  
Nanostructured Surface ◽  
Combined Method ◽  
Surface Layers ◽  
Pulsed Electron Beam ◽  
Mechanical And Tribological Properties ◽  
Ion Plasma ◽  
Defect Substructure ◽  
Mechanical And Tribological Characteristics

The data of the study of the elemental and phase composition, the condition of the defect substructure, mechanical and tribological characteristics of titanium alloy VT6 subjected to electroexplosive carburization with a sample of titanium diboride powder and the subsequent treatment by high-intensity pulsed electron beam is presented. It has been established that the main mechanisms responsible for an increase in the mechanical and tribological properties of the material are solid, dispersion, and grain boundary.

scholarly journals Justification of parameters of wheelset axle fatigue strength test-bench for railway rolling stock

2019 ◽  
Vol 294 ◽  
pp. 03008
Author(s):  
Oleksii Kuropiatnyk ◽  
Serhii Raksha ◽  
Pavlo Anofriev
Keyword(s):  
Energy Consumption ◽  
Fatigue Strength ◽  
Angular Velocity ◽  
Test Bench ◽  
Work Force ◽  
Strength Test ◽  
Rail Transport ◽  
Rolling Stock ◽  
Bench Tests ◽  
Railway Rolling Stock

The operation safety of the railway rolling stock depends directly on the strength of the base part of the wheelset – its axle. Therefore, in recent years numerous studies of theoretical and experimental nature, both for means of rail transport, and for machines containing rail track equipment are carried out. This paper substantiates the main parameters of the fatigue test bench for axles for wheelsets of railway rolling stock. We performed an analysis of the load schema for bench tests, determined the dependence of the bench work force on the parameters of the wheelset axle. In addition, we substantiated the design and parameters of vibrator. For the research, we adopted the following criteria of rationality: work force, energy consumption and longitudinal dimension of the test bench. The design is considered the best, if these criteria acquire the smallest values. The results of the research indicate that the load scheme “cantilever beam” is rational for the fatigue bench tests of the axles for wheelsets of railway rolling stock. The best design of the vibrator have to provide the test bench work force by rotating the unbalanced mass around the stationary wheelset axle. The rational vibrator contains a sectoral eccentric mass rotating at an angular velocity of about 150 s-1. In this case, the eccentric mass value is about 80 kg, and its eccentricity is 135 mm.

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.

SWIVEL JOINT WEAR-RESISTANCE INCREASE OF PROCESSING MACHINE MANIPULATORS

2021 ◽  
Vol 2021 (5) ◽  
pp. 32-39
Author(s):  
Vladimir Kapustin ◽  
Evgeniy Pamfilov ◽  
Elena Sheveleva ◽  
Galina Pilyushina
Keyword(s):  
Wear Resistance ◽  
Thermal Power ◽  
Thermal Capacity ◽  
Friction Unit ◽  
Functional Surface ◽  
Resistance Increase ◽  
Capacity Increase ◽  
Damping Characteristics ◽  
Physical And Chemical ◽  
Mechanical And Tribological Characteristics

The work purpose: the choice of promising design-technological ways to support high indices of wear-resistance and friction costs decrease with regard to conditions of parts operation in swivels. The research methods: the set of tribotechnical researches on wear-resistance, on friction loss and physical and chemical parameters. The novelty: there are offered fundamentals for development of new designs of sliding bearings with increased wear-resistance at the expense of the favorable stressed state formation in functional layers, and also thermal physical and damping indices. Investigation results: support of increased thermal conductivity and thermal capacity increase of the materials under consideration gives possibility to increase considerably the friction unit efficiency in swivels, and also at the expense of thermal power accumulation with structural constituents of materials. Wear-resistance increase in the friction unit is provided with the formation of residual compression stresses in a functional surface layer, and the presence of an expanded spring in the bearing system contributes to the increase of its damping characteristics. Conclusions: the design and technological methods offered for working capacity increase and life increase of swivel parts allow assuring increased mechanical and tribological characteristics to a considerable extent and optimizing thermal modes.

scholarly journals The vibration of prototype aircraft propeller speed reduction unit – test bench and FEM numerical simulation study

2014 ◽  
Vol 62 (4) ◽  
pp. 861-873
Author(s):  
W. Ostapski ◽  
A. Aromiński ◽  
S. Dowkontt
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Engine Speed ◽  
3D Model ◽  
Test Bench ◽  
Normal Modes ◽  
The Finite Element Method ◽  
Speed Reduction ◽  
Bench Tests ◽  
Lubrication Conditions

Abstract The results of torsional shaft vibration bench tests for a prototype aircraft propeller speed reduction unit are presented in this paper. The study was conducted as a function of engine speed and lubrication conditions. 3D model of the propeller speed reduction unit was developed. By using the finite element method, normal modes frequencies were defined. The simulation was conducted both unloaded and loaded under nominal power conditions.

Roller test bench with kinematic misalignment of running drums

2020 ◽  
pp. 7-11
Author(s):  
I.P. Troyanovskaya ◽  
I.S. Jitenko
Keyword(s):  
Mathematical Model ◽  
Closed Loop ◽  
Test Bench ◽  
Bench Tests ◽  
Different Types ◽  
Wheeled Vehicles ◽  
Power Analyses ◽  
Selection Of

A roller test bench with a rigid kinematic connection between running drums for testing of wheeled vehicles is studied. A mathematical model of the bench is developed. Its force, kinematic and power analyses were performed. Recommendations on the selection of gear ratios for different types of tests of wheeled vehicles are given. Keywords roller bench, closed loop, running drums, kinematic mismatch, power circulation, bench tests

Testing technique for jackhammers at the «СОРП» test bench

2020 ◽  
pp. 16-22
Author(s):  
V.S. Vanaev
Keyword(s):  
Impact Energy ◽  
Dynamic Characteristics ◽  
Test Bench ◽  
Operating Conditions ◽  
Testing Technique ◽  
Object Processing ◽  
Energy Characteristics ◽  
Bench Tests ◽  
Processing Energy

A methodology for measuring the parameters of jackhammers at the «СОРП» test bench is presented, which is distinguished by metrological impeccability and correctness. All parameters are measured in the same nominal operating conditions, which was not provided by the previously used methods. Keywords jackhammer, bench, tests, manual machine, object, processing, energy characteristics, impact energy, dynamic characteristics. [email protected]

scholarly journals DEVELOPMENT AND BENCH TESTS OF A PHYSICAL MODEL OF REVERSIBLE HYDRAULIC IMPACT DEVICE

2021 ◽  
Vol 2 (3) ◽  
pp. 180-188
Author(s):  
Leonid V. Gorodilov ◽  
Vitaly G. Kudryavtsev ◽  
Alexey I. Pershin
Keyword(s):  
Physical Model ◽  
Flow Rate ◽  
Test Bench ◽  
Body Movement ◽  
Bench Tests ◽  
Operating Modes ◽  
Hydraulic Impact ◽  
Impact Device

The paper presents a physical model of reversible one-way hydraulic impact device (with two striker movement limiters). The researches helped to develop the design of the device and a test bench simulating the resistance of the medium in case of possible body movement. Tests of a hydraulic impact device with a rigidly sealed body showed its efficiency in the operating modes obtained in the calculations: when changing the flow rate of the liquid, the striker strikes both in the forward and reverse directions.

scholarly journals Discharge sensitivity of collapsible drip tapes to water temperature

2021 ◽  
Vol 25 (1) ◽  
pp. 3-9
Author(s):  
Ana C. S. de Araujo ◽  
José A. Frizzone ◽  
Antonio P. de Camargo ◽  
Diego J. de S. Pereira ◽  
Verônica G. M. L. de Melo ◽  
...  
Keyword(s):  
Turbulent Flow ◽  
Water Temperature ◽  
Test Bench ◽  
Temperature Variations ◽  
Bench Tests ◽  
Effect Of Water ◽  
Significant Difference ◽  
Discharge Variation ◽  
Thin Walled ◽  
Discharge Pressure

ABSTRACT The objective of this study was to quantify the effect of water temperature variations on the discharge of collapsible thin-walled drip tapes with integrated non-pressure-compensating emitters. The tests were conducted in the laboratory using an automated test bench. Tests were performed to determine the discharge-pressure curves by varying the water temperature from 20 to 50 °C. Nine emitter models of three wall thicknesses (6, 8, and 9 MIL) were evaluated. The coefficients K and x of the discharge-pressure curves varied according to the water temperature. In flat emitters of turbulent flow (x < 0.5), the discharge decreased as the temperature increased. In the welded emitters of turbulent flow, several responses were observed. Regarding emitter D (x > 0.5), the discharge increased as the temperature was increased, while for emitter C (x < 0.5), the discharge decreased; the highest discharge variations occurred at pressures higher than 60 kPa. For embossed emitters, the discharge increased as a function of temperature, however, the greatest variation occurred at the lowest pressures. None of the emitters showed significant difference in the discharge variation due to wall thicknesses.

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