V. Petrenko, M. Netesa, O. Tiutkin, O. Gromova, V. Kozachyna
{"title":"MATHEMATICAL MODELING OF WATER PURIFICATION WITH FILTER","authors":"V. Petrenko, M. Netesa, O. Tiutkin, O. Gromova, V. Kozachyna","doi":"10.15802/stp2020/199710","DOIUrl":"https://doi.org/10.15802/stp2020/199710","url":null,"abstract":"","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128942755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"KINEMATIC SYNTHESIS OF THE GUIDE BEARING CENTRAL SLIDE-CRANK MECHANISM OF THE GRIPPING DEVICE BASED ON THE ENERGETIC MOTION TRANSMISSION INDEX","authors":"R. P. Pogrebnyak, M. Pohrebniak","doi":"10.15802/stp2020/199726","DOIUrl":"https://doi.org/10.15802/stp2020/199726","url":null,"abstract":"","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129571528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose . The article is aimed to obtain the regression dependences of manganese distribution between carbides and the metal base on the content of pig iron C, Cr, Mn and Ni after annealing at 690°C. Methodology. To achieve this purpose cast iron containing 1.09… 3.91% С; 11.43… 25.57% Cr; 0.6… 5.4% Mn; 0.19… 3.01% Ni and 0.8… 1.2% Si have been studied. To obtain reliable results analytical analysis of publications, microstructural and local micro-X-ray spectral methods, mathematical statistics and regression analysis of the obtained dependences were used. Findings . Using the methods of mathematical statistics, regression dependences of the manganese distribution between the phases and the magnitude of its concentration in the metallic basis of high-chromium cast iron on the content of C, Cr, Mn, and Ni after annealing at 690°C were obtained. During annealing, manganese was re-distributed by replacing its atoms with chromium atoms in carbides. The effect of chromium and nickel varied sig-nificantly according to the content of manganese in cast iron. The minimum values of the manganese distribution coefficient of 0.16 were observed at the minimum carbon and manganese content and the maximum amount of chromium and nickel. The maximum concentration of manganese in the basis of 5.79% was determined with the minimum content of carbon and nickel and the maximum content of chromium and manganese. This made it possi-ble to determine the chemical compositions of cast iron, which provide the required content of manganese in the metal base after annealing at 690°C. Originality . The regression dependences of the manganese content in the base and the coefficient of its interphase distribution on the content in cast iron of C, Cr, Mn and Ni after annealing at 690°C were obtained. Practical value . The obtained dependences of manganese distribution between phases in high-chromium cast iron after annealing at 690°C can be used during the development of the new wear resistant cast irons in the system Fe-C-Cr-Mn-Ni for castings that require heat treatment.
{"title":"THE INFLUENCE OF THE CHEMICAL COMPOSITION OF WEAR-RESISTANT CAST IRON ON THE INTERPHASE DISTRIBUTION OF MN AFTER ANNEALING AT 690°C","authors":"V. Netrebko","doi":"10.15802/stp2020/199717","DOIUrl":"https://doi.org/10.15802/stp2020/199717","url":null,"abstract":"Purpose . The article is aimed to obtain the regression dependences of manganese distribution between carbides and the metal base on the content of pig iron C, Cr, Mn and Ni after annealing at 690°C. Methodology. To achieve this purpose cast iron containing 1.09… 3.91% С; 11.43… 25.57% Cr; 0.6… 5.4% Mn; 0.19… 3.01% Ni and 0.8… 1.2% Si have been studied. To obtain reliable results analytical analysis of publications, microstructural and local micro-X-ray spectral methods, mathematical statistics and regression analysis of the obtained dependences were used. Findings . Using the methods of mathematical statistics, regression dependences of the manganese distribution between the phases and the magnitude of its concentration in the metallic basis of high-chromium cast iron on the content of C, Cr, Mn, and Ni after annealing at 690°C were obtained. During annealing, manganese was re-distributed by replacing its atoms with chromium atoms in carbides. The effect of chromium and nickel varied sig-nificantly according to the content of manganese in cast iron. The minimum values of the manganese distribution coefficient of 0.16 were observed at the minimum carbon and manganese content and the maximum amount of chromium and nickel. The maximum concentration of manganese in the basis of 5.79% was determined with the minimum content of carbon and nickel and the maximum content of chromium and manganese. This made it possi-ble to determine the chemical compositions of cast iron, which provide the required content of manganese in the metal base after annealing at 690°C. Originality . The regression dependences of the manganese content in the base and the coefficient of its interphase distribution on the content in cast iron of C, Cr, Mn and Ni after annealing at 690°C were obtained. Practical value . The obtained dependences of manganese distribution between phases in high-chromium cast iron after annealing at 690°C can be used during the development of the new wear resistant cast irons in the system Fe-C-Cr-Mn-Ni for castings that require heat treatment.","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"407 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115927155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose . The aim of the work is: a theoretical study of the car movement stability when exposed to longitudinal forces of a quasistatic nature; determination of analytical for estimating the longitudinal loading of cars in trains; the influence analysis of simultaneous action of certain factors on the value of longitudinal forces, at which the car movement stability is still preserved. Methodology . Assessment of the freight car stability when moving at different speeds along curved track sections was investigated using the analytical method. The most unfavorable schemes for applying compressive longitudinal forces in a vertical and horizontal plane are considered. Findings . Expressions are obtained for calculating the value of the car lift resistance coefficient by the longitudinal compressive force acting on the car as part of a freight train. The calculations were carried out in an empty and loaded state with a transverse run-up of the car body frame relative to the track axis in a guiding section of 50 mm in a curve of small radius taking into account the inertia forces from the unbalanced acceleration. Originality . In a theoretical study, the effect on the movement stability of quasistatic longitudinal compressive forces depending on the change in speed and the force value, as well as the effect of friction forces at the contact point of the wheel flange and rail and the eccentricity of fastening the tail of the automatic coupler, are considered. The influence of longitudinal compressive forces on the stability of freight rolling stock when moving in a curve of small radius with speeds up to a design value of 120 km/h is investigated. Practical value . The application of the results obtained by the above method will help to increase the stability of the freight rolling stock, which in turn will allow increasing the technical speed of train movement by removing some existing limits of permissible speeds. Using the described methodology for determining the car lift resistance coefficient will allow justifying the cause of wheel derailment, as well as to develop and put into practice the technical measures to prevent the lift of carriages, thrusts and shears of the track.
{"title":"STABILITY OF FREIGHT CARS UNDER THE ACTION OF COMPRESSIVE LONGITUDINAL FORCES","authors":"A. Shvets","doi":"10.15802/stp2020/199485","DOIUrl":"https://doi.org/10.15802/stp2020/199485","url":null,"abstract":"Purpose . The aim of the work is: a theoretical study of the car movement stability when exposed to longitudinal forces of a quasistatic nature; determination of analytical for estimating the longitudinal loading of cars in trains; the influence analysis of simultaneous action of certain factors on the value of longitudinal forces, at which the car movement stability is still preserved. Methodology . Assessment of the freight car stability when moving at different speeds along curved track sections was investigated using the analytical method. The most unfavorable schemes for applying compressive longitudinal forces in a vertical and horizontal plane are considered. Findings . Expressions are obtained for calculating the value of the car lift resistance coefficient by the longitudinal compressive force acting on the car as part of a freight train. The calculations were carried out in an empty and loaded state with a transverse run-up of the car body frame relative to the track axis in a guiding section of 50 mm in a curve of small radius taking into account the inertia forces from the unbalanced acceleration. Originality . In a theoretical study, the effect on the movement stability of quasistatic longitudinal compressive forces depending on the change in speed and the force value, as well as the effect of friction forces at the contact point of the wheel flange and rail and the eccentricity of fastening the tail of the automatic coupler, are considered. The influence of longitudinal compressive forces on the stability of freight rolling stock when moving in a curve of small radius with speeds up to a design value of 120 km/h is investigated. Practical value . The application of the results obtained by the above method will help to increase the stability of the freight rolling stock, which in turn will allow increasing the technical speed of train movement by removing some existing limits of permissible speeds. Using the described methodology for determining the car lift resistance coefficient will allow justifying the cause of wheel derailment, as well as to develop and put into practice the technical measures to prevent the lift of carriages, thrusts and shears of the track.","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127118496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"IMPROVING THE TECHNOLOGY OF WORK OF MARSHALLING YARDS BASED ON REMOTE ACOUSTIC SOUNDING","authors":"V. Burchenkov","doi":"10.15802/stp2020/199482","DOIUrl":"https://doi.org/10.15802/stp2020/199482","url":null,"abstract":"","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116251237","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose. Recently, there has been a growing demand in Ukraine for the reuse of industrial buildings that have not been in exploitation for a certain period of time. At the same time, there are frequent cases when new technological equipment transfers significant dynamic loads to existing structures over a long period of time. Since the available data regarding the dynamic properties of industrial buildings are now practically absent, the main goal of the studies made by the authors is to evaluate and analyze own dynamic characteristics of a one-storey industrial building. Methodology. To achieve this goal, it was necessary first to choose the type of industrial building, which is common enough for the formulated conditions of the reuse possibility. A one-storey unheated industrial building with three purlins (purlins 15 + 15 + 6 m) with a steel supporting frame was taken as such a building. In the course of research, the cross sections of the main load-bearing elements were varied, as well as the schemes of their connection with each other. The calculations were carried out by the finite element method based on the Lira for Windows project complex. Findings. The obtained frequency spectra of the own dynamic characteristics for the main bearing structural elements of an industrial building of the type in question are in the range up to 30 Hz. Also, during the research, dependencies were obtained for changing this range for various cases of design decisions of the building. Originality. The research results presented in the publication make it possible to evaluate the range of the own dynamic characteristics of single-storey multipurlined unheated industrial buildings with the traditional structural solution of the steel frame. Practical value. The resulting range of the own dynamic characteristics of the industrial building of the type in question is quite dangerous for human health. The most unfavorable is the oscillation form of the columns, which actually involves the entire structural frame. Therefore, in the course of research, a special method was developed and tested to stabilize such vibrations «on the base» using flexible ropes.
目的。最近，乌克兰对一段时间内未开发的工业建筑的再利用需求不断增长。与此同时，经常出现新技术设备在很长一段时间内将巨大的动荷载转移给现有结构的情况。由于目前有关工业建筑动力特性的数据几乎没有，作者所做研究的主要目的是评估和分析单层工业建筑的自身动力特性。方法。为了实现这一目标，首先有必要选择工业建筑的类型，这对于重复使用可能性的规定条件来说是足够常见的。一个单层无供暖的工业建筑，有三个檩条(15 + 15 + 6米)，钢支撑框架作为这样的建筑。在研究过程中，主要承重单元截面的变化，以及它们之间的连接方案。计算采用基于Lira for Windows项目综合体的有限元法进行。发现。所获得的有关类型的工业建筑物的主要承重结构元件本身动态特性的频谱在30赫兹的范围内。此外，在研究过程中，根据建筑设计决策的各种情况，获得了改变这个范围的依赖关系。创意。本文的研究成果使得用传统的钢框架结构方案来评估单层多层无供暖工业建筑自身动力特性的范围成为可能。实用价值。这种类型的工业建筑自身动力特性的结果范围对人体健康是相当危险的。最不利的是柱的振动形式，这实际上涉及到整个结构框架。因此，在研究过程中，开发并测试了一种特殊的方法，使用柔性绳索来稳定“在基础上”的这种振动。
{"title":"DYNAMIC PROPERTIES OF ONE-STOREY INDUSTRIAL BUILDING","authors":"D. V. Rozumenko, D. Bannikov","doi":"10.15802/stp2020/199378","DOIUrl":"https://doi.org/10.15802/stp2020/199378","url":null,"abstract":"Purpose. Recently, there has been a growing demand in Ukraine for the reuse of industrial buildings that have not been in exploitation for a certain period of time. At the same time, there are frequent cases when new technological equipment transfers significant dynamic loads to existing structures over a long period of time. Since the available data regarding the dynamic properties of industrial buildings are now practically absent, the main goal of the studies made by the authors is to evaluate and analyze own dynamic characteristics of a one-storey industrial building. Methodology. To achieve this goal, it was necessary first to choose the type of industrial building, which is common enough for the formulated conditions of the reuse possibility. A one-storey unheated industrial building with three purlins (purlins 15 + 15 + 6 m) with a steel supporting frame was taken as such a building. In the course of research, the cross sections of the main load-bearing elements were varied, as well as the schemes of their connection with each other. The calculations were carried out by the finite element method based on the Lira for Windows project complex. Findings. The obtained frequency spectra of the own dynamic characteristics for the main bearing structural elements of an industrial building of the type in question are in the range up to 30 Hz. Also, during the research, dependencies were obtained for changing this range for various cases of design decisions of the building. Originality. The research results presented in the publication make it possible to evaluate the range of the own dynamic characteristics of single-storey multipurlined unheated industrial buildings with the traditional structural solution of the steel frame. Practical value. The resulting range of the own dynamic characteristics of the industrial building of the type in question is quite dangerous for human health. The most unfavorable is the oscillation form of the columns, which actually involves the entire structural frame. Therefore, in the course of research, a special method was developed and tested to stabilize such vibrations «on the base» using flexible ropes.","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114925842","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose . The aim of the work is to study the influence of longitudinal quasistatic tensile and compressive forces in gondola cars arising at stationary and transient modes of train movement on their main dynamic indicators and interaction indicators of rolling stock with a rail track, taking into account the possibility of speed increasing. The relevance of this study is related with the need to control the longitudinal forces arising during stationary and transient modes of train movement, with increasing speeds, masses and lengths of trains, especially freight ones, increasing the locomotives` power. Methodology . The main method for studying the dynamic loading of a gondola car on typical three-element bogies is mathematical and computer modeling of the interaction of rolling stock and track structure based on the model of spatial vibrations of freight cars` couplings. In a theoretical study, the influence of quasistatic longitudinal tensile and compressive forces is considered depending on the change in speed and the force value on the tension of 1 MN; 0.5 MN; 0 and before compression of 0.5 MN; 1 MN. Findings . As a result of theoretical studies and after modeling, taking into account the processes of oscillation of gondola cars under the action of quasistatic longitudinal forces limited by norms to ± 1MN (100 tf), the dependencies of the main parameters normalized by technical documentation are obtained taking into account the value of the movement speed. Originality . The influence of longitudinal compressive and tensile forces on the dynamic loading of a freight car is studied in order to solve the problem of forecasting the dynamics of rolling stock, taking into account the value of the speed along curved track sections. Practical value . Application of the results obtained can increase the stability of freight rolling stock and the strength of the railway track, which in turn will remove some existing restrictions on permissible speeds and increase the technical speed of trains. The obtained dependencies of the main normalized indices on the longitudinal quasistatic force will make it possible to predict the development of deviations and prevent their transformation into the dangerous ones for train movement.
{"title":"GONDOLA CARS DYNAMICS FROM THE ACTION OF LONGITUDINAL FORCES","authors":"A. Shvets","doi":"10.15802/STP2019/195821","DOIUrl":"https://doi.org/10.15802/STP2019/195821","url":null,"abstract":"Purpose . The aim of the work is to study the influence of longitudinal quasistatic tensile and compressive forces in gondola cars arising at stationary and transient modes of train movement on their main dynamic indicators and interaction indicators of rolling stock with a rail track, taking into account the possibility of speed increasing. The relevance of this study is related with the need to control the longitudinal forces arising during stationary and transient modes of train movement, with increasing speeds, masses and lengths of trains, especially freight ones, increasing the locomotives` power. Methodology . The main method for studying the dynamic loading of a gondola car on typical three-element bogies is mathematical and computer modeling of the interaction of rolling stock and track structure based on the model of spatial vibrations of freight cars` couplings. In a theoretical study, the influence of quasistatic longitudinal tensile and compressive forces is considered depending on the change in speed and the force value on the tension of 1 MN; 0.5 MN; 0 and before compression of 0.5 MN; 1 MN. Findings . As a result of theoretical studies and after modeling, taking into account the processes of oscillation of gondola cars under the action of quasistatic longitudinal forces limited by norms to ± 1MN (100 tf), the dependencies of the main parameters normalized by technical documentation are obtained taking into account the value of the movement speed. Originality . The influence of longitudinal compressive and tensile forces on the dynamic loading of a freight car is studied in order to solve the problem of forecasting the dynamics of rolling stock, taking into account the value of the speed along curved track sections. Practical value . Application of the results obtained can increase the stability of freight rolling stock and the strength of the railway track, which in turn will remove some existing restrictions on permissible speeds and increase the technical speed of trains. The obtained dependencies of the main normalized indices on the longitudinal quasistatic force will make it possible to predict the development of deviations and prevent their transformation into the dangerous ones for train movement.","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115540470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose. During the maintenance of equipment for overheated axleboxes detecting, the problem of the time consumption for manual measurement of the trackside chambers temperature appeared. This is impractical in the era of using electronic programmable devices. The purpose of this article is to improve the heating control scheme for trackside chambers of the microprocessor hardware complex, namely the subunit of the microprocessor thermostat, which is designed to maintain a stable temperature inside the trackside chambers. Methodology. The studies are based on statistical data obtained as a result of the operation of overheated axleboxes detection equipment. In the article the methods of circuit simulation to obtain a microelectronic scheme have been applied. Findings . The work has considered the problem of manual servicing overheated axlebox detection equipment. The necessity of automation measurement procedure, processing and transmission of data on the temperature of the trackside chamber has been determined. An electronic scheme based on a microcontroller has been developed, which allows you to react in case of appearance of possible temperature changes outside the specified limits. The performed calculations show that the proposed scheme significantly reduces the time for servicing the equipment and eliminates the human factor, which can influence the reliability of the readings during the temperature measuring. Originality. For the first time, an improved scheme for controlling the heating of trackside chambers based on a microcontroller has been proposed, which allows automatical adjusting and maintains the temperature in the trackside chamber from 21 to 40°C, and gives the alarm signal when the thermistor fails and temperature fluctuates outside the set limits. Practical value . The heating control scheme applying allows automation of temperature measurements inside the trackside chamber. This significantly reduces the maintenance time for overheated axlebox detection equipment, since it completely eliminates both the necessity for manual check of the temperature with a mercury thermometer between trains traffic and the necessity for manual adjusting the temperature in case of its discrepancy to the standards.
{"title":"IMPROVEMENT OF MICROPROCESSOR COMPLEX SCHEME USING MICROPROCESSOR HARDWARE COMPLEX","authors":"K. Yashchuk, S. Petrovsky","doi":"10.15802/STP2019/196015","DOIUrl":"https://doi.org/10.15802/STP2019/196015","url":null,"abstract":"Purpose. During the maintenance of equipment for overheated axleboxes detecting, the problem of the time consumption for manual measurement of the trackside chambers temperature appeared. This is impractical in the era of using electronic programmable devices. The purpose of this article is to improve the heating control scheme for trackside chambers of the microprocessor hardware complex, namely the subunit of the microprocessor thermostat, which is designed to maintain a stable temperature inside the trackside chambers. Methodology. The studies are based on statistical data obtained as a result of the operation of overheated axleboxes detection equipment. In the article the methods of circuit simulation to obtain a microelectronic scheme have been applied. Findings . The work has considered the problem of manual servicing overheated axlebox detection equipment. The necessity of automation measurement procedure, processing and transmission of data on the temperature of the trackside chamber has been determined. An electronic scheme based on a microcontroller has been developed, which allows you to react in case of appearance of possible temperature changes outside the specified limits. The performed calculations show that the proposed scheme significantly reduces the time for servicing the equipment and eliminates the human factor, which can influence the reliability of the readings during the temperature measuring. Originality. For the first time, an improved scheme for controlling the heating of trackside chambers based on a microcontroller has been proposed, which allows automatical adjusting and maintains the temperature in the trackside chamber from 21 to 40°C, and gives the alarm signal when the thermistor fails and temperature fluctuates outside the set limits. Practical value . The heating control scheme applying allows automation of temperature measurements inside the trackside chamber. This significantly reduces the maintenance time for overheated axlebox detection equipment, since it completely eliminates both the necessity for manual check of the temperature with a mercury thermometer between trains traffic and the necessity for manual adjusting the temperature in case of its discrepancy to the standards.","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132625680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose . Increasing the traffic intensity in large cities requires the implementation of plans to improve the air quality in accordance with the Procedure for the implementation of state monitoring in the field of atmospheric air protection. To develop and justify the measures to reduce air pollution and negative impact on the environment and public health in decision-making information systems, it is necessary to process large amounts of available heterogeneous information and use mathematical decision-making models. The paper proposes a mathematical decision-making model for evaluating the effectiveness of air quality management plans in cities with high emissions of mobile pollution sources. Methodology . For air quality management problems in cities, a methodology is used for constructing mathematical models of decision-making under emission parameters uncertainty due to incomplete data on vehicles` emissions and their distribution over the city. The structure of data flows in the information system is considered in accordance with the requirements of modern environmental decision support systems, during which the management bodies have the opportunity to take into account different social and economic criteria. Findings . Analysis of national statistics showed an increase in the contribution of mobile sources to the structure of urban air pollution. Information technologies and optimization models are considered that make it possible to quickly assess the impact of vehicles and their traffic on atmospheric air quality in cities and make strategic decisions on planning measures to improve it. Originality . The structure of an information system and a decision-making model for air quality management are proposed based on the multi-criteria optimization of emission parameters using the construction of “source – receptor” matrix in the network area for modelling air pollution of a city’s territory with motor vehicle emissions. Practical value. The model could be used at the stage of designing municipal environmental monitoring systems and developing plans for improving atmospheric air quality in urban agglomerations.
{"title":"MOBILE POLLUTION SOURCES EMISSION FACTORS IN THE TASKS OF AIR QUALITY MANAGEMENT OF LARGE CITIES","authors":"V. Nochvai","doi":"10.15802/stp2019/196059","DOIUrl":"https://doi.org/10.15802/stp2019/196059","url":null,"abstract":"Purpose . Increasing the traffic intensity in large cities requires the implementation of plans to improve the air quality in accordance with the Procedure for the implementation of state monitoring in the field of atmospheric air protection. To develop and justify the measures to reduce air pollution and negative impact on the environment and public health in decision-making information systems, it is necessary to process large amounts of available heterogeneous information and use mathematical decision-making models. The paper proposes a mathematical decision-making model for evaluating the effectiveness of air quality management plans in cities with high emissions of mobile pollution sources. Methodology . For air quality management problems in cities, a methodology is used for constructing mathematical models of decision-making under emission parameters uncertainty due to incomplete data on vehicles` emissions and their distribution over the city. The structure of data flows in the information system is considered in accordance with the requirements of modern environmental decision support systems, during which the management bodies have the opportunity to take into account different social and economic criteria. Findings . Analysis of national statistics showed an increase in the contribution of mobile sources to the structure of urban air pollution. Information technologies and optimization models are considered that make it possible to quickly assess the impact of vehicles and their traffic on atmospheric air quality in cities and make strategic decisions on planning measures to improve it. Originality . The structure of an information system and a decision-making model for air quality management are proposed based on the multi-criteria optimization of emission parameters using the construction of “source – receptor” matrix in the network area for modelling air pollution of a city’s territory with motor vehicle emissions. Practical value. The model could be used at the stage of designing municipal environmental monitoring systems and developing plans for improving atmospheric air quality in urban agglomerations.","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121926526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Purpose. The authors’ aim is to summarize the results of relevant international publications and, based on these, to give a comprehensive review about the modern ballasted tracks’ substructure. Methodology. This article is a start of a PhD research, which means it was proceeded by a secondary research. At first, the substructure and its protection layers were summarized, after that the geosynthetic cementious composite mat materials, especially the Concrete Canvas are discussed. Findings. The experiences of the geosynthetics’ and other protection layers’ functions, show that a possible using of the GCCM (geosynthetic cementious composite mat) under the ballast can be a good solution for renewing short sections in the railway tracks. Originality. One of the authors – namely Balazs Eller – is a PhD student at Szechenyi Istvan University in Gyor (Hungary). His research topic is the reinforcement possibilities of railway substructure with the usage of special (mainly cement-bonded) layers. This article was written to collect and summarize the up to date knowledge related to modern ballasted railway tracks’ substructure to be able to determine the following research ways and possibilities at this topic. The research plan will be sentenced in the near future, as well as the required laboratory and field tests will be prepared. Practical value. As expectation, after having executed the related research, the advantages and disadvantages of GCCM layers in the railway substructure will be able to defined, as well as factual deterioration process can be determined related to the ballasted tracks and their geometrical stability.
{"title":"REVIEW OF THE MODERN BALLASTED RAILWAY TRACKS’ SUBSTRUCTURE AND FURTHER INVESTIGATIONS","authors":"B. Eller, S. Fischer","doi":"10.15802/stp2019/195831","DOIUrl":"https://doi.org/10.15802/stp2019/195831","url":null,"abstract":"Purpose. The authors’ aim is to summarize the results of relevant international publications and, based on these, to give a comprehensive review about the modern ballasted tracks’ substructure. Methodology. This article is a start of a PhD research, which means it was proceeded by a secondary research. At first, the substructure and its protection layers were summarized, after that the geosynthetic cementious composite mat materials, especially the Concrete Canvas are discussed. Findings. The experiences of the geosynthetics’ and other protection layers’ functions, show that a possible using of the GCCM (geosynthetic cementious composite mat) under the ballast can be a good solution for renewing short sections in the railway tracks. Originality. One of the authors – namely Balazs Eller – is a PhD student at Szechenyi Istvan University in Gyor (Hungary). His research topic is the reinforcement possibilities of railway substructure with the usage of special (mainly cement-bonded) layers. This article was written to collect and summarize the up to date knowledge related to modern ballasted railway tracks’ substructure to be able to determine the following research ways and possibilities at this topic. The research plan will be sentenced in the near future, as well as the required laboratory and field tests will be prepared. Practical value. As expectation, after having executed the related research, the advantages and disadvantages of GCCM layers in the railway substructure will be able to defined, as well as factual deterioration process can be determined related to the ballasted tracks and their geometrical stability.","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"1125 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116076151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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