scholarly journals TECHNICAL DIAGNOSIS OF TRACTION ROLLING STOCK. FEATURES OF APPLICATION OF THE METHOD OF EVALUATION OF THE RESIDUAL RESOURCE OF SUPPORTING METAL STRUCTURES

2021 ◽  
pp. 43-52
Author(s):  
M.O. Bahrov ◽  
Keyword(s):  
Service Life ◽  
Key Words ◽  
Rolling Stock ◽  
Operating Life ◽  
Load Bearing ◽  
Metal Structures ◽  
Technical Diagnosis ◽  
Certification Procedure ◽  
Experimental Project ◽  
Method Of Evaluation

Recently there is the intrest increasing in admission of private locomotives to the operating on the particular headings of public railways. At the initiative of Ministry of Infrastructure the Resolution of the Cabinet of Ministers of Ukraine dated 04.12.2019 № 1043 “About implementation of experimental project on the admission of private locomotives to the operating on the particular headings of public railways” is confirmed. The experimental project is designed for two years, it means till 04.12.2021. According to the requirements of the “Temporary Regulations on the procedure of the admission of private locomotives to the operating on the particular headings of public railways” approved by the Order of the Ministry of Infrastructure of Ukraine dated 04.03.2020 № 191, defined the requirements for applicants (enterprises), rolling stock, their maintanence and repair, personnel. In particular, it is established that private locomotives are allowed to operate on public railways with the availability of a conformity certificate. Private locomotives, that are applied for participation in experimental project, as a rule, are not new, and have certain service life, respectively, certain performance characteristics, remaining operating life of load-bearing metal structures, so the certification procedure of locomotives has some particularities and should cover, exept common measures of certification, measures of technical diagnoses, i.e. with the assessment of final resources of load-bearing metal struc-tures. Key words: experimental project, allowance for private locomotives, a conformity certificate, technical diagnoses.

STUDY OF RESIDUAL RESOURCE AND ESTABLISHMENT OF THE LIMIT LIFE OF NON-PURCHASER PASSENGER CARS OF CONSTRUCTION OF KVZ

2020 ◽  
pp. 54-62
Author(s):  
N. Radkevich ◽  
S. Sapronova ◽  
V. Tkachenko
Keyword(s):  
Service Life ◽  
Residual Life ◽  
Rolling Stock ◽  
Technical Diagnostics ◽  
Passenger Cars ◽  
Load Bearing ◽  
Metal Structures ◽  
Passenger Traffic ◽  
Long Operation ◽  
Theoretical Results

In order to ensure the uninterrupted performance of passenger traffic, the task of ensuring the operation of rolling stock outside the extended service life, including passenger cars for the carriage of passengers, remains relevant. Based on this, there is a need for comprehensive research aimed at substantiating the possibility of ensuring operation while maintaining dynamic and strength characteristics. The article examines the residual life of load-bearing metal structures of passenger cars based on the results of technical diagnostics and standard tests. It is concluded that the condition of the load-bearing metal structures of passenger cars built by the Kryukiv Carriage Plant (KСP) after long operation does not approach the limit. The obtained practical and theoretical results make it possible to extend the service life of passenger cars for the construction of KCP beyond the factory set by 41 years.

scholarly journals INVESTIGATION OF RESIDUAL RESOURCE OF SPECIAL RAILWAY VAGON

2021 ◽  
Vol 1 (37) ◽  
pp. 50-58
Author(s):  
N. Radkevich
Keyword(s):  
Service Life ◽  
Residual Life ◽  
Technical Diagnostics ◽  
Residual Service Life ◽  
Passenger Cars ◽  
Scientific Publications ◽  
Load Bearing ◽  
Metal Structures ◽  
Long Operation ◽  
Standard Tests

The article examines the residual life of load-bearing metal structures (NMC) of special cars for the transportation of special contingent on the basis of the results of technical diagnostics and standard tests. Most scientific publications investigate the increase in the service life of different types of passenger cars by improving their design properties. The following methods are used in the study: resetting from wedges, resource tests for impact strength, impact tests, static strength tests. On the basis of carrying out technical diagnostics and standard tests the possibility of establishment of new appointed service life of cars is defined. The residual resource was set at one of the minimum calculated values obtained by mathematical dependence to calculate the residual service life. When determining the residual resource during the standard tests, the evaluation of the fatigue resistance margin was performed taking into account the stress of the load-bearing structures of the car during the tests. It is concluded that the condition of load-bearing metal structures of special wagons for transportation of special contingent after long operation does not approach the limit. The obtained practical and theoretical results make it possible to extend the service life of special wagons for the transportation of special contingent beyond the established by the manufacturer.

scholarly journals Vibration model as a system of coupled oscillators in a direct current electric motor

2019 ◽  
Vol 124 ◽  
pp. 02002
Author(s):  
O. A. Filina ◽  
A. N. Tsvetkov ◽  
P. P. Pavlov ◽  
D. Radu ◽  
V. M. Butakov
Keyword(s):  
Mathematical Model ◽  
Service Life ◽  
Economic Effect ◽  
Dc Motor ◽  
Operational Reliability ◽  
Technical Condition ◽  
Normal Operation ◽  
Rolling Stock ◽  
Operating Life ◽  
Vibration Model

This article describes a vibration model connected by individual nodes of a DC motor. The purpose of the article is a mathematical model allowing to predict the work of machines with a depreciation resource and search for ways to increase the information content of assessing the functioning of the rolling stock condition without dismantling them. Currently, the operational reliability of the DC motor is reduced after the development of the service life. Study and evaluation of the vibration effect on the brush-collector node. The main components of the DC motor (bearings, electrical brushes) are unrecoverable. Therefore, any interference with their normal operation leads to premature wear of the entire DC motor. Existing methods for life-extending maintain the operational reliability of a DC motor equal or close to the passport data for several years. This model allows vibration diagnostics without dismantling the DC motor and stopping the rolling stock. The mathematical model describes the oscillations of each node of the DC motor in the direction of movement of the rolling stock, showing the excess of the permissible value. After mathematical processing of the results, a machine reliability model under study is obtained (usually in the form of polynomials) as a function of the needed parameters – the influencing factors. Due to this model, pre-detected defects can save on repairs and maintenance in the future. This model is the basis of software for online diagnostics. The proposed model allows providing an objective use of repair and restoration compositions depending on the current technical condition, which will lead to an increase in the service life of the mechanism and savings in operating costs. On the one hand, extending the operating life of a DC motor should produce an economic effect, and on the other hand, technical measures to maintain operational reliability cause an increase in material costs.

scholarly journals ПОВЫШЕНИЕ КОРРОЗИОННОЙ СТОЙКОСТИ ДЕТАЛЕЙ КУЗОВА МИКРОАВТОБУСОВ СЕМЕЙСТВА “ГАЗЕЛЬ”

2021 ◽  
pp. 53-62
Author(s):  
G.S. Chibukhchyan
Keyword(s):  
Corrosion Resistance ◽  
Service Life ◽  
Automotive Industry ◽  
Effective Means ◽  
Operating Conditions ◽  
The Body ◽  
Rolling Stock ◽  
Corrosion Properties ◽  
Load Bearing ◽  
The World

The automotive industry makes a significant contribution to the global economic production. Its annual turnover is comparable to the sixth largest economy in the world. The automotive industry accounts for about 5% of the world Gross Domestic Product (GDP). The automotive industry has a powerful multiplier effect and stimulates the development of a number of other industries. Automotive products account for about half of the world's oil consumption, half of the rubber produced, 25% of glass and about 15% of steel. Note that the size and structure of the automotive market often act as indicators of the level of economic development, and its state quickly and accurately reflects the changes taking place in the world economy.0 The average service life of a car is up to 15-20 years, depending on many factors. The service life is significantly reduced when the car is exposed to aggressive operating conditions. Most often, the car fails due to corrosion damage (corrosion) of its parts: the body, pipelines, elements of brake systems, frames and other important components. The damage caused to humanity by corrosion is enormous. According to various sources, corrosion "eats" from 10 to 25% of the world's iron production. As a result of corrosion of the load-bearing and critical elements of the rolling stock of road transport, reliability and performance, passive safety and road safety are sharply reduced, which requires the use of new effective means and methods to increase the corrosion resistance of critical parts and components of the car. One of the effective solutions to improve the anti - corrosion properties is the application of an insulating coating on the surface of the metal, which can significantly reduce the rate of its corrosion. However, it is necessary to take into account the economic component and the complexity of the technological process. For minibuses of the “GAZEL” family operated in Yerevan, it is of particular importance to increase the corrosion resistance of parts and load-bearing elements of the body.

scholarly journals Reliability as a Key Driver for a Sustainable Design of Adaptive Load-Bearing Structures

2022 ◽  
Vol 14 (2) ◽  
pp. 895
Author(s):  
Dshamil Efinger ◽  
Andreas Ostertag ◽  
Martin Dazer ◽  
David Borschewski ◽  
Stefan Albrecht ◽  
...  
Keyword(s):  
Environmental Sustainability ◽  
Construction Materials ◽  
Internal Stresses ◽  
Elastic Model ◽  
Load Spectrum ◽  
Operating Life ◽  
Load Bearing ◽  
Linear Elastic ◽  
High Rise ◽  
Bearing Structure

The consumption of construction materials and the pollution caused by their production can be reduced by the use of reliable adaptive load-bearing structures. Adaptive load-bearing structures are able to adapt to different load cases by specifically manipulating internal stresses using actuators installed in the structure. One main aspect of quality is reliability. A verification of reliability, and thus the safety of conventional structures, was a design issue. When it comes to adaptive load-bearing structures, the material savings reduce the stiffness of the structure, whereby integrated actuators with sensors and a control take over the stiffening. This article explains why the conventional design process is not sufficient for adaptive load-bearing structures and proposes a method for demonstrating improved reliability and environmental sustainability. For this purpose, an exemplary adaptive load-bearing structure is introduced. A linear elastic model, simulating tension in the elements of the adaptive load-bearing structure, supports the analysis. By means of a representative local load-spectrum, the operating life is estimated based on Woehler curves given by the Eurocode for the critical notches. Environmental sustainability is increased by including reliability and sustainability in design. For an exemplary high-rise adaptive load-bearing structure, this increase is more than 50%.

One of possible approaches to estimating the service life of a wheel set axle of high-speed rolling stock

2021 ◽  
Author(s):  
G. M. Volokhov ◽  
A. A. Lunin ◽  
D. A. Knyazev ◽  
V. V. Chunin ◽  
M. V. Timakov
Keyword(s):  
Service Life ◽  
High Speed ◽  
Rolling Stock

Cross Property Correlations for Metals Subjected to Fatigue Damage Accumulation

2002 ◽  
Author(s):  
Mahesh C. Bogarapu ◽  
Igor Sevostianov
Keyword(s):  
Electrical Resistance ◽  
Damage Accumulation ◽  
Fatigue Tests ◽  
Electric Resistance ◽  
Metal Structures ◽  
Accumulated Damage ◽  
Fatigue Damage Accumulation ◽  
Theoretical Predictions ◽  
Method Of Evaluation ◽  
Better Than

A new method of evaluation of elastic property deterioration due to accumulated damage is suggested and experimentally verified. It is based on the explicit correlations between two groups of anisotropic properties – conductivity and elasticity, recently established for porous/microcracked materials with anisotropic microstructures. An experimental study of fatigue has been done to verify the theoretical predictions. The electrical resistance and Young’s modulus are measured as functions of the number of loading cycles in the standard fatigue tests. The agreement between the theoretical predictions and the direct experimental data is better than 10% in all cases. The results allow one to use the measurement of electric resistance to estimate the damage accumulated in metal structures and decrease in the elastic modulus.

scholarly journals Modeling the mechanical wear of the contact elements of pantograph during high-speed movement

2020 ◽  
Vol 157 ◽  
pp. 01022
Author(s):  
Victor Philippov ◽  
Alexandr Smerdin
Keyword(s):  
Service Life ◽  
High Speed ◽  
Theoretical Calculations ◽  
Experimental Studies ◽  
Maximum Error ◽  
Life Assessment ◽  
Rolling Stock ◽  
Mechanical Wear ◽  
Wear Process ◽  
Mechanical Component

The use of contact elements with an extended service life is one of the most economical and least costly ways to ensure reliable, economical and environmentally friendly transmission of electricity to rolling stock. To evaluate the service life in OSTU, a methodology for conducting experimental studies of contact pairs of pantograph has been developed and successfully tested, involving bench tests for each pair of contact materials “contact insert - contact wire” in order to determine their optimal combination to reduce wear and increase service life. Assessment of the amount of wear and prediction of the life of the contact elements are made, including using mathematical modeling. The purpose of this article is to improve the mechanical component of the wear model of the contact elements of pantograph in high-speed conditions. The results of experimental studies and theoretical calculations of the mechanical wear of contact elements are presented. The analysis of the graphs allows us to conclude that it is possible to use an improved mathematical model for modeling the mechanical component of the wear process of the elements of contact pairs with a maximum error value of not more than 5%.

POINTWORK SERVICE LIFE EXTENSION BY MEANS OF UNEVEN STIFFNESS OF TURNOUT CURVE RAILS LINE

2017 ◽  
pp. 7-14
Author(s):  
Ludmila Blazhko ◽  
Vladislav Zakharov ◽  
Yevgeniy Chernyayev ◽  
Yevgeniy Shekhtman
Keyword(s):  
Service Life ◽  
Computational Methods ◽  
Practical Importance ◽  
Side Impact ◽  
Life Extension ◽  
Rolling Stock ◽  
Study Results ◽  
Service Life Extension ◽  
Train Speed ◽  
Side Track

Objective: To reduce side wear of rail elements of side track backing-up rail. Methods: Comparative and computational methods were applied in the study. Results: It was detected that in order to extend the pointwork turnout curve service life, it is necessary to reduce the side impact on an outer rail by using rail pads of diverse elasticity. Practical importance: Application of rail pads of diverse elasticity under the outer and inner rails of a pointwork turnout curve makes it possible to increase the speed of rolling stock movement on the side direction of pointwork and increase the life of a pointwork turnout curve with fixed train speed.

THE IMPROVEMENT OF WHEEL TREAD REPROFILING PROCESS

2017 ◽  
pp. 120-128
Author(s):  
Igor Ivanov ◽  
Dmitriy Kononov ◽  
Sergey Urushev
Keyword(s):  
High Speed ◽  
Performance Enhancement ◽  
Practical Knowledge ◽  
Practical Importance ◽  
Rolling Stock ◽  
Speed Profile ◽  
Operating Life ◽  
Operational Life ◽  
High Speed Grinding ◽  
Process Solutions

Object: To show the lack of wheelset operating life efficiency use in case traditional methods of wheel tread reprofiling were used in the process of repair works. To consider the possibilities of further improvement of this process on the basis of new reprofiling technologies, using the deep and high-speed grinding. Methods: The methods of wheel tread reprofiling were analyzed, the effective process solutions, based on theoretical conclusions and current practical knowledge, were studied. Results: Wheel set wastage in case of using the traditional ways of reprofiling was estimated. Preliminary parameters of wheelset reprofiling modes using high-speed grinding were estimated, providing for the increase in wheel set operational life and reprofiling performance enhancement. Practical importance: The appropriateness of rolling stock wheel tread reprofiling, by using the method of infeed high-speed profile grinding, was presented. The obtained results may be applied in the development of requirements specification for wheel tread reprofiling machine at repair facilities of the Russian Railways.

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