scholarly journals TECHNICAL DIAGNOSTICS-GUARANTEE OF HIGH-QUALITY AND EFFECTIVE MAINTENANCE OF TIMBER ROLLING STOCK

2021 ◽  
Vol 10 (4) ◽  
pp. 208-216
Author(s):  
Konstantin Yakovlev ◽  
Sergey Legostaev
Keyword(s):  
Traffic Safety ◽  
Road Safety ◽  
Technical Condition ◽  
Rolling Stock ◽  
Technical Diagnostics ◽  
Control Room ◽  
Safe Operation ◽  
Standard Analysis ◽  
Remote Transmission ◽  
Diagnostics System

A logging vehicle is a source of increased danger, and its serviceability affects road safety. Diagnostics of the technical condition of the car allows you to timely identify serious defects in components, mechanisms and aggregates without removing them and disassembling them, to have time to eliminate malfunctions in time and bring the technical characteristics to the standard. Analysis of the literature data has shown that diagnostics of the technical condition of a logging vehicle plays an important role in preventing accidents. Our task was to improve the reliability of the car and reduce the complexity of work during the next maintenance. In the article, we justify the criteria necessary for the organization of safe operation of logging vehicles when transporting timber on public roads. The age and technical condition of the timber rolling stock fleet is analyzed. The most frequent failures of forest transport vehicles on the example of cars of the KAMAZ family, affecting the organization of traffic safety, are determined. The necessity of pre-trip control inspections and Express diagnostics of vehicles is revealed. Taking into account the identified shortcomings, the scheme of post-trip removal of parameters from the built-in diagnostics system of a logging vehicle and subsequent remote transmission of data to the server of the control room of a motor transport enterprise has been developed. The conducted scientific research allowed us to find a solution to the problem, which is to allocate technical diagnostics in an independent type of technical impact. This measure will reduce the costs of premature technical impacts on the systems, components and aggregates of timber rolling stock without reducing the requirements for traffic safety

scholarly journals PRIVATE TRACTION ROLLING STOCK ON THE MAIN-LINE TRACKS. ASPECTS CERTIFICATION OF PRIVATE LOCOMOTIVES

2020 ◽  
pp. 97-106
Author(s):  
M.O. Bahrov ◽  
◽  
I.V. Gladkykh
Keyword(s):  
Technical Condition ◽  
Rolling Stock ◽  
Measuring Instruments ◽  
Technical Diagnostics ◽  
Expert Evaluation ◽  
Test Results ◽  
Normative Documents ◽  
Certification Testing ◽  
Certification Body ◽  
Key Aspects

The article deals with the procedures for certification of private locomotives in order to grant authorization for their operation on certain public railway lines. The special feature of the certification is that, as a rule, locomotives belonging to departments, enterprises and organizations that are not within the management sphere of JSC "Ukrzaliznytsia" and were not previously used on public railway lines of Ukraine, but are now presented for participation in the project, can be of several types, different years of construction, have different diesel operating hours (SMU hours), different degrees of wear of the mechanical part of load-bearing structures, wheelsets, trolleys, couplings, braking equipment, different technical condition of measuring instruments, safety devices and air tanks, devices security, etc. Therefore, the article presents the provisions of certification schemes (models) that can be used by the certification body for the certification of single locomotives and batches of private locomotives, and their aspects. The paper also presents the basic normative documents according to which certification procedures are carried out. The key aspects of existing certification testing of locomotives are specified. The scope of work on technical diagnostics of locomotives for certification is described. The procedure and duration of the direct certification process are given taking into account the analysis of documentation, technical inspection, provision of expert evaluation, selection and identification of a sample (samples) of a representative item from the batch submitted for sampling, certification testing, processing and registration of test results, comprehensive conclusion on compliance of the locomotive with the requirements of regulatory and technical documents, decision-making on the possibility (or impossibility) of issuing a certificate.

scholarly journals SCIENTIFIC APPROACH TO THE METHODS OF INCREASING THE LIFE CYCLE OF WHEELS OF RAILWAY VEHICLES

2021 ◽  
Vol 1 (38) ◽  
pp. 164-172
Author(s):  
S. Sapronova ◽  
V. Tkachenko ◽  
N. Braikovska ◽  
Y. Zub
Keyword(s):  
Life Cycle ◽  
Traffic Safety ◽  
Technical Condition ◽  
Rolling Stock ◽  
Optimal Parameters ◽  
Maintenance And Repair ◽  
Complete Restoration ◽  
Scientific Approach ◽  
Wheel Profile ◽  
Railway Rolling Stock

The value of the life cycle of rolling stock wheels is determined by the frequency of maintenance, in the process of which the turning is carried out to restore the profiles of the rolling surfaces, or the replacement of completely worn wheels. Traffic safety depends on the technical condition of the wheels of locomotives and wagons. Maintenance and repair of wheelsets accounts for about 30% of all costs of Ukrzaliznytsia's rolling stock repair units. Wheel repair technologies are based on the complete restoration of wheel profiles by turning, using which, their life cycle is reduced, and costs increase by 20% or more. The railways of Ukraine use an outdated, unreasonable, inefficient system of control over the formation of rolling surfaces in operation. Therefore, there is a need to create a scientifically sound approach to methods of extending the life cycle of the wheels of locomotives and wagons while ensuring the safety of railway rolling stock. According to the proposed scientific approach, the wheel profile is restored to optimal parameters, which provides an extended life cycle of wheelsets. As a result of the developed scientific approach the life cycle of wheel pairs will increase by 15… 25% and the expenses of the railway for their repair will considerably decrease.

scholarly journals RESEARCH OF THE OPERATIONAL DEPENDABILITY OF THE LADA KALINA VEHICLE SYSTEMS AFFECTING TRAFFIC SAFETY

Dependability ◽  
2017 ◽  
Vol 17 (4) ◽  
pp. 31-35
Author(s):  
I. V. Denisov ◽  
A. A. Smirnov
Keyword(s):  
Traffic Safety ◽  
Road Safety ◽  
Design Theory ◽  
Technical Condition ◽  
The Road ◽  
Warranty Period ◽  
Reliability Indicators ◽  
Operation Conditions ◽  
Vladimir Oblast ◽  
Primary Test

The growing number of cars in the Russian Federation means that a large number of vehicles with different performance indicators get involved in the transportation process. One of those indicators is dependability that is a key characteristic of quality. A vehicle’s operation is the primary test of its dependability, of which the indicators depend on the used design solutions and the manufacturing process. Defects occurring at various stages of vehicle manufacture significantly affect the dependability indicators. It must be noted that a vehicle is a source of increased hazard. A failure of a vehicle in operation due to a manufacturing defect or nonobservance of operation conditions may cause an accident. Therefore it is extremely important to have at one’s disposal information on the implemented systems reliability indicators that affect active safety. In this context, the research of automotive vehicles dependability in operation is a relevant scientific task, solving which will enable managing the technical condition of vehicles and ensure traffic safety.The aim of this research was to evaluate the operational dependability of the systems that directly affect the road safety of Lada Kalina with subsequent use of the obtained information in the development of automated systems for management of automotive vehicle technical condition in operation.The methods of research are based on the theoretical foundations of vehicle maintenance, the probability theory and mathematical statistics, experimental design theory. Standard methods of processing of statistical information on the operational dependability of vehicles were used. The data was obtained from official OAO AvtoVAZ dealerships in the Vladimir Oblast. As the result of research of the operational dependability of the systems that directly affect the road safety of Lada Kalina a list of defective components in the steering, braking, chassis, lighting and signalling systems was identified. Times to failure of parts, units and assemblies that limit the vehicle dependability, as well as the primary numerical characteristics of random distribution were determined. The defects identified at early stages of operation indicate design and manufacturing flaws of Lada Kalina.Conclusions: In this paper the authors present the findings regarding the defects of the Lada Kalina systems that directly affect traffic safety. This information was obtained by means of analyzing vehicle failures within the warranty period that were recorded based on the owners’ applications to the OAO AvtoVAZ dealerships an maintenance facilities in the Vladimir Oblast. Maintenance facilities, when performing diagnostic operations as part of routine maintenance, should take into consideration the list of the least dependable vehicle components given in this paper and directly affecting the traffic safety. The manufacturing factory should take note of the indicated defects and develop a plan of their elimination, as well as timely inform the consumers of the identified warranty-specific defects and recall the products.

scholarly journals Methods of analysis of possible states of the object diagnosis.

2021 ◽  
Vol 24 (1) ◽  
pp. 33-38
Author(s):  
VAZHYNSKYI A. ◽  
◽  
ZHUKOV S. ◽  
Keyword(s):  
Flaw Detection ◽  
Technical Condition ◽  
Measuring System ◽  
Diagnostic Tools ◽  
Technical Diagnostics ◽  
Information Measuring ◽  
Other Information ◽  
Complex Technical Systems ◽  
Technical Systems ◽  
Diagnostics System

The development of new methods of technical diagnostics is an important task aimed at improving the efficiency and safety of the operation of industrial equipment. Such methods are complexes of jointly used methods for obtaining diagnostic information, methods for extracting from it the actual data on the technical state of the diagnosed objects, and methods for organizing diagnostic processes. Complex technical systems are characterized by complex nonlinear interactions between their constituent elements, complex scenarios of causal relationships between hazardous, probabilistic events and processes occurring during their operation. These scenarios can be implemented in complex scenario trees. Features of technical diagnostics of complex technical systems are determined by the distinctive properties of failures in such systems and scenarios. The technical diagnostics system is an information-measuring system and contains sensors of controlled parameters, communication lines with an information collection unit, executive devices, devices for interfacing with other information-measuring and control systems. Methods of technical diagnostics serve as the basis for constructing such a system. The current level and prospects for the development of diagnostic tools, flaw detection and automated control open real possibilities of using methods of maintenance and repair of equipment by a technical condition. The greatest effect from the use of such a system is achieved when operating complex equipment, preventive repair of which is associated with high costs, and emergency repair.

scholarly journals Improving the Methodology of Placing Peripheral Devices for Monitoring the Technical Condition of Rolling Stock

2021 ◽  
pp. 25-36
Author(s):  
V. V. Burchenkov
Keyword(s):  
Traffic Safety ◽  
Block Diagram ◽  
Research Work ◽  
Technical Condition ◽  
Rolling Stock ◽  
Functional Block Diagram ◽  
Process Step ◽  
Technical Control ◽  
Control Devices

Purpose. Based on the research work of units and parts of rolling stock undercarriage in transient modes of emergency situations it is proposed to optimize the sequential placing of peripheral contactless devices for technical control of locomotives and cars on railway lines. Methodology. Investigation of transient processes of temperature increase of faulty axle bearings of locomotives and cars during remote technical diagnosing allows one to organize theory and hardware construction of the peripheral systems for testing the rolling stock on the move. Automatic control of the technical state of the rolling stock on the move – the last and in some cases the only possible process step, which allows revealing unacceptable defects in rolling units and thereby prevent emergencies in railway transport. Findings. Based on the research it was proposed a solution to the optimization problem of placing peripheral control devices of rolling stock when moving according to the criteria of the linear and exponential nature of heating defective axle boxes of wheelsets and other units of undercarriage. The risks of train stop on the railway line because of the erroneous classification of normally heated axle boxes as overheated, as well as the consequences of classification of overheated axle box as normally heated axle boxes were evaluated. Originality. Optimization model of placing peripheral control devices based on probabilistic criteria for evaluating the degree of permissible risk that, at a minimum, should not be exceeded during the transition to control technical means. A functional block diagram of test hardware diagnostics for the wheelsets when determining the gradations of digital indicators of defects was proposed. Practical value. The value of the results obtained lies in the improvement of a method of placing technical control peripheral devices and diagnosing rolling stock when determining the distance between the control stations in the same direction and organizing tracking modes for railcars with developing defects. From a technical point, reduced error probability is directly related to traffic safety and diagnostic algorithms.

scholarly journals RESEARCH INTO SAFE TRAFFIC OF LITHUANIAN RAILWAY LINES

Transport ◽  
2005 ◽  
Vol 20 (4) ◽  
pp. 154-159
Author(s):  
Laura Černiauskaite ◽  
Igoris Podagelis ◽  
Kazys Sakalauskas
Keyword(s):  
Traffic Safety ◽  
Traffic Accidents ◽  
Human Factor ◽  
Technical Condition ◽  
Rolling Stock ◽  
The European Union ◽  
Stock Company ◽  
Traffic Incidents ◽  
First Results

The European Union directions pay a specific focus on traffic safety. Safety of railway transport traffic is among priority fields which has a direct effect on the quality of life of the population. It is most convenient to consider the number of breaks and accidents per year as the indicator of traffic safety. Reasons of traffic accidents can be very different. Most accidents occur due to poor technical condition of rolling‐stock and infrastructure, the human factor and the deficient organization of traffic. Stock Company “Lithuanian railways” can not assure safe traffic yet. The number of traffic incidents decreased in a few preserves only. Considering that, it is necessary to prepare a strategy for traffic safety and the program for its implementation. In 2002 specialists started preparing a study for safe traffic. The study is important for the preparation and implementation of the mentioned program. First results obtained from the research have already approved the importance of the influence of infrastructure, rolling‐stock and a human factor on traffic safety. The research carried out indicates positive changes in the situation of traffic safety of Lithuanian railways.

scholarly journals CERTIFICATION DEPOT AS ONE OF WAYS TO ENHANCE PERFORMANCE MULTIPLE UNITS

2015 ◽  
Vol 2 (158) ◽  
Author(s):  
Anatoliy Falendysh ◽  
Vіktor Baikov ◽  
Olga Kletska
Keyword(s):  
Traffic Safety ◽  
Technical Condition ◽  
Rolling Stock ◽  
Multiple Units

The technical condition of the locomotive fleet is directly related to traffic safety. However,according to the Department's annual suburban passenger Ukrzaliznytsia analysis Traffic Safety negativetrend of the deteriorating condition of the motor-car rolling stock (MVPS) is stored.

scholarly journals STATEMENT OF THE PROBLEM FOR TECHNICAL DIAGNOSTIC TANK CARS

2021 ◽  
pp. 68
Author(s):  
V. VOROPAI
Keyword(s):  
Life Cycle ◽  
Technical Condition ◽  
Industrial Enterprise ◽  
Practical Significance ◽  
Rolling Stock ◽  
Alternative Form ◽  
Technical Diagnostics ◽  
Main Task ◽  
Global Management ◽  
Modern Technologies

The purpose of the work is to formulate the problem of technical diagnostics of tank cars. Research methods. Methods of formal logic were used methods of the theory of reliability and probability were used to describe the stages of solving the problem. Results. A study of a large array of data on the performance indicators of tank cars for the transportation of liquefied gases of the fleet of a chemical industry enterprise in Ukraine was carried out. The results of technical inspection of tank cars were obtained. A hypothesis has been formed about the possibility of increasing the resource of tank cars of an industrial park for their further operation. A proposal was put forward to consider the last stage of the life cycle as the stage "Life cycle renewal and recycling", which is not defined in Statement Standart. It should in an alternative form represent the stages of "utilization", "modernization", "modification" and "recycling", this will correspond to modern technologies on the scale of the global management of any resources. The research task was formulated, which determines the main task - the possibility of increasing the resource of tank cars of the operating fleet of an industrial enterprise using the methods of technical diagnostics. Practical significance. The solution to the task of determining the technical condition of tank cars will allow an industrial enterprise to reasonably operate the rolling stock during the forecast period.

scholarly journals Experimental study of the rolling resistance of car wheels on a roller stand

2021 ◽  
Vol 12 (2) ◽  
pp. 68-75
Author(s):  
Igor Мarmut ◽  
◽  
Vitalii Kashkanov ◽  
Volodymyr Zuiev ◽  
◽  
...  
Keyword(s):  
Traffic Safety ◽  
Experimental Studies ◽  
Rolling Resistance ◽  
Resistance Coefficient ◽  
Technical Condition ◽  
Radial Force ◽  
Test Method ◽  
Rolling Stock ◽  
Passenger Cars ◽  
Wheel Rolling

The article considers the results of experimental studies of the rolling resistance of car wheels on a roller stand. Also, the dependence of the coefficient of total resistances during wheel rolling on the stand rollers on the speed was established. Monitoring and diagnosing the technical condition of the rolling stock of vehicles from the point of view of traffic safety is one of the most important problems. This control is especially important for systems whose technical condition affects traffic safety, first of all, brake systems, as well as the power unit in the traction test mode. Foreign and domestic experience testifies to the effectiveness of instrumental control. Its advantages lie in the reliability of the values of the checked parameters. The diagnostic equipment includes roller stands, on which you can check the braking and traction properties of cars. As shown by many studies, in particular, carried out at the Department of Technical Operation and Service of Automobiles, KhNADU (HADI), inertial stands provide more reliable information about the technical condition of the car. The inertial test method allows you to reproduce real speed and thermal modes of operation. To improve the accuracy of diagnosing a car on a roller stand, it is necessary to have an idea of the nature of the interaction of the car wheels with the stand rollers. Studies of wheel rolling on the stand rollers have been carried out by many authors since the 70s of the last century. However, all of these studies were conducted on old bias tires. Now, only radial tires are used on passenger cars, the rolling resistance of which on rollers has practically not been studied. Therefore, returning to the study of this issue is relevant. The rolling resistance of wheels on the rollers of the stand will significantly affect the nature of their interaction during long-term running tests (due to increased heating of contacting bodies, power losses, violation of similarity conditions, etc.). It was found that the value of the rolling resistance coefficient noticeably depends on the ratio of the radii of the roller and the wheel, as well as the contact load, that is, the radial force of pressing the wheel against the roller, and in addition, on the speed and duration of the mode. The obtained results of the experiment made it possible to improve the theory of the interaction of a car wheel with the rollers of an inertial diagnostic stand. Also, the results of the experiments can be extended to different types of tires and the ratio of the radii of the wheel and roller.

scholarly journals Road Overbridges of Car Lift Type for Crossing Railway Tracks in Densely Built-Up Areas of Modern Cities

2021 ◽  
Vol 18 (5) ◽  
pp. 90-108
Author(s):  
D. V. Efanov ◽  
V. N. Myachin ◽  
G. V. Osadchy
Keyword(s):  
Los Angeles ◽  
Traffic Safety ◽  
Road Traffic ◽  
Rolling Stock ◽  
Technical Diagnostics ◽  
Technical Solution ◽  
Road Transportation ◽  
Moving Platforms ◽  
Monitoring Zone ◽  
Alternative Sources

The theoretical prerequisites for construction of road overbridges of car lift type for crossing railways by automotive vehicles are suggested. A technical solution has been proposed that makes it possible to ensure the crossing by cars of «problem» railway crossings during periods of their long-term closure for road traffic. The same solution can be used to organise a road overbridge in other locations where there is no railway crossing. The technical solution itself is based on the use of overhead road overpasses and is a «simplified» version of the solution implemented by Elon Musk and his company in Los Angeles based on a tunnel, moving platforms and freight elevators. For development of car lift type road overbridges, computational methods of theoretical mechanics, technical diagnostics and monitoring, as well as the theory of queuing should be used to estimate the number of cars passed through it when crossings are closed. It is proposed that the structures of the overbridge should be «built-in» into the landscape, equipped with alternative sources of energy supply and technical means of control, diagnostics and monitoring of rolling stock and of location of direct intersection of automobile and railway roads (an intelligent monitoring zone). The proposed promising technical solution in the form of a road overbridge makes it possible to increase comfort of road transportation and improve traffic safety at level crossings.

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