scholarly journals METHODOLOGY OF CHOOSING PARAMETERS FOR DIAGNOSING ELEMENTS OF URBAN ELECTRIC VEHICLES

2021 ◽  
Vol 3 (163) ◽  
pp. 138-143
Author(s):  
V. Shavkun
Keyword(s):  
Technological Process ◽  
High Efficiency ◽  
Technical Condition ◽  
Individual Characteristics ◽  
Rolling Stock ◽  
Diagnostic Tools ◽  
Repair System ◽  
Electric Transport ◽  
Repair Work ◽  
Maintenance And Repair

The operation of various vehicles in the field of urban electric transport is accompanied by high costs to maintain their working condition throughout the service life. Preservation of serviceability of vehicles is provided by performance of planned and preventive works on maintenance (MOT) and repair, and also the unscheduled repairs which are carried out for elimination of failures which arise in the interprophylactic periods, and malfunctions. As already noted, in the planned preventive maintenance and repair system, the vehicle after a certain mileage (time) is forcibly subjected to preventive actions in the prescribed amount. At the same time, despite the adjustment of maintenance and repair modes depending on a number of factors, there is no individual approach to each rolling stock. However, there is a need for such an approach, because even when rolling stock under the same conditions, the technical condition of each of them at the same time due to a number of reasons (individual characteristics of rolling stock, driving quality, maintenance, etc.) can differ significantly. Not every rolling stock requires all the operations provided by the "hard" volume of a particular type of maintenance. Execution of these "unnecessary" operations leads, on the one hand, to incomplete realization of individual properties of a rolling stock, increase in expenses for MOT, on the other, at all does not promote improvement of its technical condition. On the contrary, more frequent interventions in the work of joints of units and mechanisms contribute to increased wear of bonded surfaces, the appearance of damage to joints, violation of the tightness of joints. Significant losses of labor and material resources are also associated with a large amount of repair work due to late detection of failures. The fullest use of individual capabilities of rolling stock and ensuring on this basis the high efficiency of rolling stock during operation can be done through the widespread introduction into the technological process of maintenance and repair of diagnosing the technical condition of rolling stock. To increase the efficiency of the vehicle, use, methods and diagnostic tools have been developed, which are used both during maintenance and repairs, and as an independent technological process. Diagnosis allows to increase the coefficient of readiness and probability of trouble-free operation of vehicles, to reduce the complexity and cost of operation, to increase the maintainability and controllability of vehicles.

scholarly journals The method for increasing the efficiency of equipment’s maintenance in railway traction power supply systems

2018 ◽  
Vol 47 (3) ◽  
pp. 39-47 ◽  
Author(s):  
Oleksandr Matusevych ◽  
Valeriy Kuznetsov ◽  
Viktor SYCHENKO
Keyword(s):  
Power Supply ◽  
Operational Reliability ◽  
Technical Condition ◽  
Repair System ◽  
Maintenance And Repair ◽  
Traction Substations ◽  
Electric Equipment ◽  
Traction Power Supply ◽  
Supply Systems ◽  
Traction Power

Purpose. To develop the method for increasing the efficiency of the equipment’s maintenance and repair system, ensuring necessary level of operational reliability of the equipment, safety and reliability of the electric equipment with minimal expenses on operation. Relevance. Aging of the power equipment in railway power supply systems sharply raised a need for assessment of its states and degree of risk for operation outside rated service life. In critical conditions of technological processes and operational modes of the railways it is necessary to increase the equipment’s operational reliability. The scheduled maintenance and repair system whose main technical and economic criterion is the minimum of equipment’s downtimes on the basis of a rigid regulation of repair cycles, in the conditions of market regulations in the field of repair in many cases does not provide the optimal decisions due to insufficient financing. The solution of this problem is possible by improvement of the maintenance and repair system. Under these conditions the main direction for supporting the operational reliability of power electric equipment on TS is a development of the modern methods based on individual supervision over real changes of technical condition of power equipment. Scientific novelty. In this article the authors proposed an integrated approach, on the basis of which can be developed the effective maintenance and repair system for traction power supply systems. Proposed approach allowed to react quickly to changes of service conditions on traction substations, to control the technical condition of power electric equipment under the conditions of uncertainty, to establish interrelation between quality of service and operational reliability of the equipment, to choose a service strategy on traction substations. Practical importance. The validity of the developed method was confirmed by the results of calculations and practically by choosing the optimal maintenance's option for transformer TDTN-25000/150-70 U1 (ТДТН-25000/150-70 У1) on traction power supply substation.

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 The Basics of Developing an Alternative Concept for Commercial and Military Vehicle Operation (Random Strategy)

2021 ◽  
Vol 1 (2) ◽  
pp. 61-69
Author(s):  
Yeghiazar Vahram Vardanyan ◽  
Valerik Mamikon Harutyunyan ◽  
Karo Hakob Mosikyan ◽  
Vladimir Sahidovich Koichev
Keyword(s):  
Structural Characteristics ◽  
Rolling Stock ◽  
Repair Work ◽  
Maintenance And Repair ◽  
Stochastic Nature ◽  
Military Vehicles ◽  
Military Vehicle ◽  
Random Strategy ◽  
Vehicle Operation ◽  
Planning Strategies

The efficiency of commercial automobiles and wheeled military vehicles mainly depends on the choice of maintenance (M) and current repair (CR) concept. In the paper the difficulties of adapting the (M) and (CR) planning strategies to the structural characteristics of modern transport facilities are pointed out. The advantages of using the (M) and (CR) random strategy for transport facilities based on the stochastic nature of failures and malfunctions are substantiated. Considering the failures and malfunctions as random values and identifying the patterns of their distribution based on γ percentage resources, it is proposed to develop a list of regulated maintenance and repair work, periodicity and labor intensity based on a random strategy, which will increase the efficiency of preserving the technical resource of the rolling stock throughout the entire life cycle of the vehicle. 

COMPOSITIONAL MODEL DEVELOPMENT OF DC DRIVE MOTOR RELIABILITY ESTIMATE FOR TRAM-CARS

2020 ◽  
Vol 2020 (8) ◽  
pp. 39-46
Author(s):  
Elena Shischenko ◽  
Anton Alekseev ◽  
Vera Novikova
Keyword(s):  
Model Development ◽  
Reliability Assessment ◽  
Rolling Stock ◽  
Repair System ◽  
Reliability Estimate ◽  
Design Elements ◽  
Maintenance And Repair ◽  
Compositional Model ◽  
Dc Drive ◽  
Definition Of

The investigation purpose is to develop a method for the assessment of reliability values of dc drive motors for tram cars the life of which approaches its completion which will allow correcting the maintenance and repair system in order to decrease the number of sudden failures and hence the number of unscheduled repair operations. According to the available rolling-stock (trams) repair statistics, a considerable part of unscheduled repair works is determined by failures of dc drive motors. Reasoning from the investigation purpose one of the problems consists in the development of the simulator allowing the accurate definition of quantitative characteristics of reliability during the operation. The operation reliability of dc drive motors of tram-cars is affected considerably by the interaction of design structure elements and it raises a question of combined structural-functional patterns use during the formation of a compositional simulator for reliability estimate. The results obtained show that the account of structural-functional ties of dc drive motors design elements in tram-cars during the simulator formation for reliability assessment allows obtaining more correct data for the definition of maintenance terms and repair works. In such a way, the compositional model for reliability assessment of dc drive motors installed in tram-cars allows obtaining more exact dependences of their trouble-free operation probability that gives an opportunity to correct terms for scheduled-preventive repair, so that to decrease the number of sudden failures becoming more often, as it is seen in practice, at the approach of tram-car operation completion and decrease the number of unscheduled repair works. The model offered for reliability assessment is urgent for the term correction of maintenance and repair works of tram-car dc drive motors the life of which comes to the completion and also for motors which run out of power.

scholarly journals Monitoring the Technical Condition of AC Electric Locomotives using Traction Energy Consumption Rates

2021 ◽  
Vol 18 (5) ◽  
pp. 62-89
Author(s):  
A. P. Semenov ◽  
V. V. Semchenko ◽  
I. Yu. Khromov
Keyword(s):  
Technology Implementation ◽  
Reactive Power ◽  
Electricity Consumption ◽  
Technical Condition ◽  
Operating Conditions ◽  
Repair System ◽  
Dynamic Data ◽  
Maintenance And Repair ◽  
Institute Of Technology ◽  
General Director

Currently, the methods of monitoring the technical condition of locomotives using data of on-board microprocessor-based control systems are widely used. This monitoring of Russia has become an operating technology of the locomotive maintenance and repair system.The main problem of monitoring is the limited set of sensors in locomotive circuits. Increased number of sensors leads to a decrease in reliability and to an increase in the cost of a locomotive and of its life cycle, while allowing to achieve better quality of diagnostic information.Besides, it is advisable to have integrated indicators of the technical condition of a locomotive. The article presents a computer software product for analysing the technical condition of a locomotive based on dynamic data on consumption of traction active power and generation of reactive power. The software was developed by using algorithmic language Visual BASIC for Applications, embedded in MS Excel, using probabilistic and statistical methods of analysis.The method for diagnosing the technical condition of a locomotive within the monitoring system is based on a comparison of dynamics of consumption of active and generation of reactive power by two sections of the same locomotive according to the principle of functional benchmarking. For monitoring the technical condition of locomotives, the term «pre-failure» is suggested, which is defined as the operable condition of a locomotive while there are internal hidden defects or damage. Pre-failure manifests itself in power consumption. To analyse the technical condition of AC electric locomotives in terms of electricity consumption, the initial data must have a high degree of unimodality, which is determined by uniformity of operating conditions.The resulting data obtained following the analysis of the technical condition of a locomotive based on the dynamic data on consumption of tractive active energy and generation of reactive power can be used to determine a defect that causes a change in consumption of electricity at the moment when the locomotive enters technical maintenance and repair depot. *Information about the authors: Semenov, Alexander P. – Ph.D. (Eng), General Director of JSC Research Institute of Technology, Control and Diagnostics of Railway Transport, Omsk, Russia, [email protected]. Semchenko, Victor V. – Ph.D. (Eng), General Director of JSC Railroad Centre of Technology Implementation of Krasnoyarsk Railway, Krasnoyarsk, Russia, [email protected]. Khromov, Igor Yu. – Business Analyst of LLC2050-Integrator, Moscow, Russia, [email protected]. Article received 13.05.2020, accepted 23.10.2020. For the original Russian text of the article please see p. 62. 

Methodological Aspects of the Development of Resource-Technological Models for the Formation of the Design Cost of Maintenance and Repair of Oil and Gas Equipment

2020 ◽  
Vol 9 (1) ◽  
pp. 3-11
Author(s):  
Denis Siutin ◽  
Sergey Pahomov
Keyword(s):  
Oil And Gas ◽  
Full Range ◽  
Operating Time ◽  
Technical Condition ◽  
Time Data ◽  
Project Cost ◽  
Repair Work ◽  
Maintenance And Repair ◽  
Gas Pumping ◽  
Methodological Aspects

An important element in ensuring the stability of the gas transmission system of PJSC Gazprom is the reliability and safety of gas pumping units (GPU), their systems and equipment. Due to the aging of a large number of operating types and modifications of gas compressor units, the task of maintaining their healthy technical condition and ensuring reliable operation through maintenance and repair (MRO) is especially important. At present, when determining the project cost of GPU maintenance and repair work, indicators and data of different levels are used, and at the same time, data on the nomenclature, physical and cost indicators of work in the context of GPU types are not regulated and unified, depending on the full range of work performed by type MRO, technical condition and operating time of units. The article describes the methodological aspects of the development of resource-technological models (RTM) for maintenance and repair in the context of types (modifications) of gas compressor units, types and lists of works that will allow for the integrated formation of the project cost of work.

scholarly journals Organization of operation, repair and maintenance of locomotives in the railroad operating domain

2019 ◽  
Vol 135 ◽  
pp. 02008
Author(s):  
Aleksander Pavlyukov ◽  
Alexander Buynosov ◽  
Aleksander Mironov ◽  
Sergey Laptev
Keyword(s):  
Service Providers ◽  
Technical Condition ◽  
Repair System ◽  
Cycle Structure ◽  
Maintenance And Repair ◽  
Repair Costs ◽  
Limited Life ◽  
Software Product ◽  
Equipment Failures ◽  
Repair Cycle

The methods that are widely used today to determine the required locomotive fleet, the Corresponding maintenance and repair system consider the locomotive as a whole, without taking into account the technical condition of its individual units, which have a limited life cycle. Furthermore, the methods used today do not take into account the time spent on relocation from an operational locomotive depot to a service depot and back. The purpose of this study is to develop the methods for determining the number of locomotives based on the anticipated workloads for specific operational sections, the necessary accompanying maintenance and repair, the optimized repair cycle structure with due account of the available resources of the limiting units in the railroad operating domain which are capable of taking into account the technical condition of equipment (failures, repair costs, and time spent on relocation from one depot to another). A model for organization of repair of gas turbine locomotives assigned to operational locomotive depots while undergoing repair in service locomotive depots is proposed. Using this model, it is possible to develop a software product for distributing routine locomotive repairs among service providers, thus optimizing the workload of the latter.

scholarly journals DEVELOPMENT OF ALGORITHMIC MODELS FOR RESEARCH OF RELIABILITY PARAMETERS OF TROLLEYBUS TRACTION ELECTRIC MOTORS IN THE OPERATION PROCESS

2020 ◽  
Vol 2 ◽  
pp. 39-46
Author(s):  
Vyacheslav Shavkun ◽  
Tatyana Pavlenko ◽  
Olha Kozlova
Keyword(s):  
Block Diagram ◽  
Rolling Stock ◽  
Diagnostic Tools ◽  
Electric Transport ◽  
Electric Motors ◽  
Reliability Indicators ◽  
Reliability Parameters ◽  
Operational Factors ◽  
Reliability Of Operation ◽  
Algorithmic Model

The analysis of the reliability parameters of traction engines during the operation of trolleybuses in different modes is done. The presented groups of operational factors are lead to the emergence of censored samples. The methods of express analysis of engine reliability using technical diagnostic tools are determined. A block diagram of an algorithmic model for studying the reliability parameters of traction electric motors of trolleybuses during operation has been developed. It allows at any time to evaluate the influence of operational factors on the reliability indicators of traction electric engines and to more clearly and reasonably assign organizational, technical and preventive measures. It has been established that the effective and reliable operation of urban electric transport, in particular trolleybuses, depends on the reliability of individual components and assemblies of rolling stock, as well as on the quality and timely control of their parameters during operation. In practice, it has been proved that failure of traction electric motors (TEM) of trolleybuses leads to significant material losses at electric transport enterprises. And one of the main parameters of reliability of traction electric motors of trolleybuses is the reliability of operation during operation. Based on the research results, practical recommendations are developed on the rational choice of diagnostic parameters. Their implementation at electric transport enterprises will increase the reliability of traction electric motors as a whole up to 10 %. The developed methodology allows the study (assessment) of the reliability parameters of any type of traction engine of a trolley during operation

scholarly journals PLANNING OF REPAIR CONSTRUCTION WORKS IN THE SOLUTION OF PROBLEMS OF TECHNICAL OPERATION OF THE RESIDENTIAL REAL ESTATE

2018 ◽  
Vol 22 (3) ◽  
pp. 40-50
Author(s):  
D. I. Emelyanov ◽  
N. A. Ponyavina ◽  
E. A. Chesnokova ◽  
N. V. Bredikhina
Keyword(s):  
Real Estate ◽  
Housing Stock ◽  
Technical Condition ◽  
Individual Characteristics ◽  
Living Conditions ◽  
Repair Work ◽  
The Real Estate ◽  
Apartment Buildings ◽  
The Individual ◽  
Construction Works

The process of the housing stock aging is constant and continuous. Untimely repair of housing significantly increases the risk of accidents. The purpose of the management companies is to carry out a complex of repair works of apartment buildings according to the current quality requirements for the entire period of operation. The real estate, enterprises, organizations owners engaged in the operation and maintenance of housing, are extremely interested to increase the duration of the effective operation period for buildings and structures basing on the system of maintenance and repair of buildings. This system is equally important for each period of the life cycle of the property. In the field of housing and communal services, despite the ongoing reforms, the problem of timely financing of repair works aimed at ensuring comfortable and safe living conditions in accordance with the existing quality standards is acute. In this regard, the development of an effective system of housing maintenance is a priority. The current state and the main prospects of development of maintenance and maintenance of the housing stock during the planning and repair work in apartment buildings are considered. The proposed multilevel structure of the maintenance system and the methodology of evaluation of technical condition of residential properties taking into account the individual characteristics of the object. The method of planning of repair and construction works taking into account organizational and technological reliability is developed. The technique presented in the article allows to improve the quality of management decisions, which in turn ensure compliance with comfortable and safe living conditions and efficient use of financial resources.

scholarly journals Schedule maintenance and repair system of Locomotive

2020 ◽  
Vol 8 ◽  
Author(s):  
Valiev M.Sh ◽  
Kosimov H.R
Keyword(s):  
Automatic Control ◽  
Technical Condition ◽  
Monitoring Systems ◽  
Measurement Information ◽  
Repair System ◽  
Maintenance And Repair ◽  
Operation Process ◽  
Processing Measurement ◽  
Efficiency And Reliability

To increase the efficiency and reliability of locomotives, it is necessary to constantly monitor the operation process. The introduction of modern automatic control and monitoring systems on locomotives is not only a departure from the established state of the equipment, but also an effective and efficient way of processing measurement information that can detect changes in the technical condition of key parts.

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