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 MODEL OF AN ESTIMATION OF A RESOURCE OF TRACTION TRANSFER OF A MOTOR CARLOAD ROLLING STOCK

2015 ◽  
Vol 2 (158) ◽  
Author(s):  
Aleksandr Babanin ◽  
Sergiy Yarovoy ◽  
Vadim Bulba
Keyword(s):  
Life Cycle ◽  
Service Life ◽  
Motor Block ◽  
Technical Condition ◽  
Normal Operation ◽  
Rolling Stock ◽  
Definition Of ◽  
Analytical Expressions

In clause questions of definition of a resource of the wheel motor block traction transfer of a motorcarload rolling stock are considered. Problems of forecasting of a technical condition of responsible units oftraction transfer are certain. The model of deterioration in which the periods extra earnings are allocated,normal operation, intensive deterioration and prolongation of service life of the wheel motor block of amotor carload rolling stock is formalized for weigh his life cycle. For each allocated period meetingdependences of speed and intensity of deterioration are offered. According to dependences calculations arelead and analytical expressions of wear of points of cog-wheels of power reducing of traction transfer whichallow to predict his resource in operation are received.

Mathematical Justification of the New Method of Determination of Wheel Pair’s and Rail’s Damage

2009 ◽  
Author(s):  
Nikoloz Mgebrishvili ◽  
Guri Sharashenidze ◽  
Manana Moistsrapishvili ◽  
Sergo Sharashenidze ◽  
Liana Kuparashvili ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Mobile Device ◽  
Traffic Safety ◽  
Economic Effect ◽  
Rolling Stock ◽  
Wheel Pair ◽  
Railway Traffic ◽  
Accuracy Of Measurement ◽  
Mathematical Justification

Development of modern railways largely depends on the control of intactness of the wheel pairs and rails. It is impossible to ensure safety and increase the speed of railway traffic without providing such control. Detection of the wheel pairs’ and rails’ wear and damage is one of the key problems of railway science. Many scientific works are accomplished and lot of devices are elaborated in this field, but the mentioned problem still remains urgent. In order to increase the traffic safety, the group of authors has proposed a constructional scheme of the mobile device for detection of wheel pairs’ and rails’ wear and damage, which will have increased accuracy of measurement. Increasing of accuracy of measurement is carried out on the basis of development of mathematical model, which provides the realization of equal wear of wheel pairs’ as well as ones no equal wear. By installation of the proposed device on each wheel pair of each railcar of the rolling stock, the automatic control of wheel pairs’ and rails’ condition will be achieved. Namely: -Detection of the worn out wheel pair and determination of wear degree; -Detection of the damaged wheel pair; -Identification of the worn out or damaged wheel pair. Besides, on the basis of elaborated mathematical model: -Detection of the worn out rail; -Detection of the damaged rail; -Identification of location of the worn out or damaged rail. The obtained information will be constantly connected to the locomotive computer system. Therefore, for checking rolling stocks, there will no longer be need to build expensive stationary systems, to move trains great distances for their inspection and in the result, the time lost for stoppage will be saved. So, with the help of proposed mobile device, the traffic safety increases and at the same time expenses for detection of wheel pairs’ wear and damage decrease, which results in significant economic effect.

scholarly journals And probabilistic model to calculate on-the-dejnosti nodes and interfaces of the manipulator

2017 ◽  
Author(s):  
Н.А. Сидоренков ◽  
Б.Г. Мартынов
Keyword(s):  
Service Life ◽  
Operational Reliability ◽  
Technical Condition ◽  
Optimal Frequency ◽  
Maintenance And Repair ◽  
Reliability Models ◽  
Warranty Period ◽  
Hydraulic Manipulators ◽  
Statistical Studies ◽  
Proactive Maintenance

Во время эксплуатации гидроманипуляторов (ГМ) возникает задача продления жизненного цикла ГМ. В настоящее время он составляет при полной нагрузке ГМ от 3 до 5 лет или 6000 моточасов до капитального ремонта. В зависимости от условий работы и обслуживания этот ресурс, по данным ПО «Подъемные машины», может быть израсходован за 8 мес. Руководством по эксплуатации ГМ определены пять видов ТО: ЕТО и четыре номерных. Причем в гарантийных обязательствах определен период работы ГМ до первого отказа. Он соответствует примерно 120 моточасам. Для продления срока службы ГМ до капитального ремонта необходимо перейти от обычной планово-предупредительной системы ТО и ремонта к проактивной системе. Основу проактивной системы ТО и Р составляет правильное управление техническим состоянием механизма с целью повышения его эксплуатационной надежности, определения оптимальной периодичности ТО и Р, что в свою очередь требует полной информации о техническом состоянии механизма и надежности его узлов и сопряжений. Цель проактивной системы ТО и Р – предупреждать отказ узлов и сопряжений механизма. Для реализации этой цели необходима разработка модели надежности ГМ и проведение статистических исследований отказов элементов механизма. Поэтому данная задача является актуальной. В настоящей статье приводится выражение, которое позволит формировать стратегию обслуживания данного типа манипуляторов для продления их срока службы. Цель исследования – разработка вероятностной модели надежности узлов и сопряжений ГМ для решения одной из задач управления техническим состоянием механизма с целью обоснования проактивной системы ТО и Р. During operation of hydraulic manipulators (GM), there arises the problem of extending the life cycle of the GM. Currently, it is under full load UM from 3 to 5 years or 6000 hours before overhaul. Depending on the conditions of operation and maintenance of this resource, according to «Lifting machines», can be used for 8 months. The user manual for the GM identifies five kinds: UTB and four plates. And in a warranty period defined by the work of the GM until the first failure. It corresponds to about 120 hours. To extend the service life of the GM overhaul need to move from conventional preventive system of maintenance and repair to a proactive system. The basis for proactive maintenance and R is the correct management of the technical condition of the mechanism with the purpose of increasing its ex-operational reliability, determining the optimal frequency and R, which in turn requires full information about the technical condition of the mechanism and reliability of its components and interfaces. The purpose of proactive maintenance and repair – to prevent failure of the nodes and interfaces of the mechanism. To achieve this goal it is necessary to develop reliability models of the GM and carrying out statistical studies of failures of elements of the mechanism. Therefore, this task is urgent. In this paper, we provide an expression that will form the servicing strategy for this type of manipulators to extend their service life. The purpose of the study: the development of probabilistic reliability models of the nodes and interfaces of GM to address one of the problems of control of technical condition of the mechanism in order to justify the proactive maintenance and R.

scholarly journals Assessment of the Efficiency of Transformers Technical Condition Monitoring Based on Dissolved Gas Analysis

2020 ◽  
pp. 438-448
Author(s):  
Ammar A. Yahya ◽  
Vladimir M. Levin
Keyword(s):  
Economic Effect ◽  
Quantitative Measure ◽  
Condition Index ◽  
Diagnostic Value ◽  
Operational Reliability ◽  
Technical Condition ◽  
Gas Analysis ◽  
On Line ◽  
Single Method ◽  
Transformer Equipment

The method of analysis of gases dissolved in oil is one of the most informative methods for early detection of defects in power oil-filled transformers. This determined its wide application in the practice of off-line and on-line monitoring of transformer equipment. In the article, based on the ratio of weight coefficients used in the calculation of the technical condition index of functional units and equipment units, a method for determining the reliability of oil-filled transformer equipment is proposed. An indicator that characterizes the quantitative measure of the diagnostic value of a single method (group of methods) for monitoring parameters of a power oil-filled transformer in the calculations of the technical condition index is obtained. The efficiency of monitoring the state of a power oil-filled transformer was evaluated based on the results of the analysis of gases dissolved in oil. A quantitative example of calculating the economic effect of increasing the operational reliability of a group of 110 kV power transformers in one of the areas of the distribution network using a remote diagnostic monitoring system based on the analysis of gases dissolved in oil is given

scholarly journals The method of determining technical resources of mobile agricultural machinery and destination terms of repair and service work

2020 ◽  
pp. 156-165
Author(s):  
M. O. Vasylenko ◽  
L. I. Shapoval
Keyword(s):  
System Analysis ◽  
Residual Life ◽  
Economic Effect ◽  
Discrete Event ◽  
Statistical Processing ◽  
Warning System ◽  
Statistical Simulation ◽  
Operational Reliability ◽  
Technical Condition ◽  
Agricultural Machinery

Annotation Purpose. Optimization terms of repair and maintenance works due to monitoring of the technical condition in mobile agricultural machinery on the basis statistical simulation using of its technical resource. Methods. System analysis and methods for statistical processing results of operational reliability tractors in experimental farms on NAAS. For the development statistical simulation models, discrete-event simulation, “Any Logic” simulation environment is provided. Results. The intensity using of mobile agricultural machinery during the year by the amount of fuel consumption is established, which makes it possible to plan the terms and scope of repair and maintenance works during the period of minimum load of equipment. The advantages strategy of adaptive maintenance and repair of agricultural machinery in comparison with the planning and warning system, which consist in determining the periods of repair and maintenance work, taking into account the intensity using mobile equipment and residual resource, which is basis for the development and implementation of operational management plans for its technical. Prerequisites for statistical simulation of the process of using the technical resource of mobile equipment are highlighted; the stages of establishment of its residual resource and appointment of terms of repair and maintenance works are defined. Conclusions. The economic effect on the results of research will be to monitor the technical state of mobile equipment, minimization of downtime for technical reasons during intense field work and effective use of technical resources maintaining a crop of potential losses by 8–10% due to the timely implementation processes. Keywords: mobile technology, adaptive repair strategy, initial data, modeling process, modeling algorithm, statistical simulation model, technical condition, residual life, terms of repair works.

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.

scholarly journals WEAR DYNAMICS ANALYSIS OF THE SUPPORTING STRUCTURES OF SHUNTING LOCOMOTIVES OF INDUSTRIAL RAILWAY TRANSPORT UNDER THE INFLUENCE OF MATERIAL CORROSION

2021 ◽  
pp. 57-65
Author(s):  
Y. V Horobets
Keyword(s):  
Service Life ◽  
Environmental Influence ◽  
Corrosive Wear ◽  
Thickness Measurement ◽  
Technical Condition ◽  
Metal Corrosion ◽  
Rolling Stock ◽  
Uniform Corrosion ◽  
Maintenance Work ◽  
Supporting Structures

Purpose. The research is aimed at obtaining new knowledge about the environmental influence on the supporting structures of the traction rolling stock of railways according to the corrosive wear parameter, the nature of the dynamics of this influence, as well as the evaluation of technical condition of the domestic traction rolling stock of industrial railways. Methodology. To obtain the relevant data, the author conducted aggregation and analysis of the results of ultrasonic thickness measurement of the main supporting structures of locomotives, obtained during eight years of the work to extend the service life of industrial transport locomotives. The supporting structures of series of locomotives presented in this study have a total range of service life of 25-48 years. They are located in different regions of Ukraine. Findings. The author found that among the surveyed fleet of diesel locomotives of industrial transport, the uniform corrosion level of supporting structures has a linear dependence on their service life with a rather low slope. Thus, according to the definitions of the normative documentation, which was relevant at the time of production of the rolling stock units that are the objects of this study, the material of the supporting structures (except for one particular case) belongs to the resistant group of metal corrosion resistance. Originality. Due to reasons such as the independence of industrial rolling stock from state-owned railway enterprises and the performance of maintenance work by various organizations, information on the general condition of the rolling stock of industrial transport is not readily available. The author for the first time collected statistical data on the state of industrial rolling stock and analyzed them. Practical value. The obtained results illustrate the development dynamics of equal corrosion of traction industrial transport structures, which, in turn, gives grounds for the subsequent improvement of the methodology of examining rolling stock units both during scheduled work and in order to extend the service life.

scholarly journals Improving the efficiency and safety of operation of underground tunnel escalators. Forecasting model

2021 ◽  
Vol 1 (1) ◽  
pp. 12-22
Author(s):  
V.A. Popov ◽  
◽  
V.V. Yelantsev ◽  
Keyword(s):  
Mathematical Model ◽  
Information Technologies ◽  
Good Condition ◽  
Forecast Model ◽  
Technical Condition ◽  
Technical State ◽  
Rolling Stock ◽  
Main Task ◽  
Technical Object ◽  
Underground Tunnel

The subways of Moscow and St. Petersburg are the oldest in Russia. Its infrastructure includes a diverse fleet of equipment. The fleet of rolling stock in the last decade was mainly renewed, while due to the peculiarities of operation and mainly for financial reasons, the escalator fleet will not be replaced for a long time. In this connection, the main task of the departments responsible for the operation of escalators is to maintain the rapidly aging fleet in good condition. Thus, a situation, when the escalator economy is a source of costs to meet the constantly increasing demand for re-sources is formed. At the same time, the limited allocation of all types of resources only aggravates the current situation. The above circumstances contribute to the actualization of the issue of selection of tools, which makes it possible to increase the efficiency and safety of operation of underground tunnel escala-tors. According to the authors of the paper, one of such tools can be the forecasting of the technical state of the elements of the escalator subsystems, made on the basis of special routing of infor-mation flows, designed for the optimal distribution of allocated resources. Since an escalator is a complex technical object of increased danger, the routing of information flows for it characterizing its technical condition is possible only on the basis of a preliminary de-composition into information levels. For this reason, the beginning of the paper is devoted to the decomposition of the technical state of the escalator into four information levels, covering all aspects of the technical state from the mi-cro-level of the state of materials from which the elements of the escalator subsystems are made, ending with the functional state of the entire escalator. The purpose of the work is further revealed. It consists in describing a general mathematical model for predicting the technical state of the elements of the escalator subsystems and the re-quirements for its construction. The work describes the main task that solves the proposed forecast model. In conclusion, the options for using the proposed model are considered. The scientific novelty of the proposed approach lies in the use of the modern mathematical appa-ratus of the fuzzy set theory for processing parametric information, elements of artificial intelli-gence, as well as a precedent approach in analyzing the operational situation, which, in combination, are necessary to build a predictive model of the technical state as applied to the escalator facilities of the subway. From a practical point of view, it should be noted that the proposed mathematical model, implemented on the basis of modern information technologies, will make it possible to more rationally adjust the mechanisms for allocating resources, while ensuring the necessary level of safety for passenger transportation.

scholarly journals INVESTIGATION CASES OF ROLLING STOCK DERAILMENT USING MATHEMATICAL MODELING

2019 ◽  
Vol 20 (2) ◽  
pp. 340-350
Author(s):  
А. Batig ◽  
A. Kuzyshyn
Keyword(s):  
Mathematical Modeling ◽  
Mathematical Model ◽  
Mathematical Models ◽  
Technical Condition ◽  
The Body ◽  
Object Oriented Programming ◽  
Rolling Stock ◽  
Highly Qualified ◽  
Rolling Surface ◽  
Computer Environment

The purpose of this article is to analyze the need to apply the methods of mathematical modeling when performing examinations of rolling stock derailment. The description of the dynamic behavior of rolling stock when moving on the track is a rather complicated, time-consuming process, which requires highly qualified expert and time-consuming. The presence of detailed mathematical models of the constituent units of the rolling stock would greatly facilitate the study of cases of their derailment. At present, a significant number of scientific papers are devoted to the study of the dynamics of rolling stock movement using mathematical models. In Lviv NDISE, investigations of such railway accidents as rolling stock derailment from the rails are performed by experts according to the methods developed by the doctor of technical sciences Sokol E. M., allowing to take into account a certain number of parameters of wagon running gears. At present, when experts examine the cases of rolling stock derailment, there is a need to develop new methods that would allow to take into account more parameters of the undercarriage parts of the wagons, such as: parameters of the damping system, spring suspension, bolster, node of the body-bogie bolster center plates, etc. P. There are also cases of railway accidents, in which one of the reasons may be the presence of defects on the rolling surface of the wheels of the rolling stock. In this regard, experts of Lviv NDISE to take into account the above-mentioned parameters of the running gears and to identify the most significant for rolling stock derailment, it was developed object-oriented programming in the computer environment Maple. At present, have developed a mathematical model of a passenger car of a diesel train, the DPKr-2, and an improved mathematical model of a freight wagon. The authors of the article came to the conclusion that the use of mathematical models and their computer solution can facilitate the process of researching rolling stock cases from the rails, as it allows automating and speeding up the study of dynamic indicators of rolling stock, facilitating the process of establishing the limiting values of its technical condition parameters and assessing the consequences changes in these parameters in certain working conditions.

Contribution to the Research and Development of Radiation Chambers in Steam Reforming. Problem-Oriented Application of a Fuzzy Expert System

1992 ◽  
Vol 57 (10) ◽  
pp. 2125-2134 ◽  
Author(s):  
Petr Stehlík ◽  
František Babinec
Keyword(s):  
Carbon Dioxide ◽  
Mathematical Model ◽  
Expert System ◽  
Service Life ◽  
Research And Development ◽  
Steam Reforming ◽  
Methane Conversion ◽  
Chemical Processes ◽  
Fuzzy Expert System ◽  
Present Contribution

An application of a fuzzy expert system intended for estimating some parameters of steam reforming can also be one of the examples of an ever increasing utilization of expert systems in practice. The present contribution deals with the method making use of a verified mathematical model for simulating thermal chemical processes in reforming furnace radiation chamber in order to create knowledge base. This base includes linguistic values of selected independent and dependent variable quantities. Examples given illustrate an evaluation of dependent variable quantities (methane conversion into carbon dioxide and monoxide, reaction tube service life) by means of the said expert system based on queries.

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