I. Zhukovytskyy, V. Pakhomova, D. O. Ostapets, O. Tsyhanok
Purpose. The article is aimed at the development of a methodology for detecting attacks on a computer network. To achieve this goal the following tasks were solved: to develop a methodology for detecting attacks on a computer network based on an ensemble of neural networks using normalized data from the open KDD Cup 99 database; when performing machine training to identify the optimal parameters of the neural network which will provide a sufficiently high level of reliability of detection of intrusions into the computer network. Methodology. As an architectural solution of the attack detection module, a two-level network system is proposed, based on an ensemble of five neural networks of the multilayer perceptron type. The first neural network to determine the category of attack class (DoS, R2L, U2R, Probe) or the fact that there was no attack; other neural networks – to detect the type of attack, if any (each of these four neural networks corresponds to one class of attack and is able to identify types that belong only to this class). Findings. The created software model was used to study the parameters of the neural network configuration 41–1–132–5, which determines the category of the attack class on the computer network. It is determined that the optimal training speed is 0.001. The ADAM algorithm proved to be the best for optimization. The ReLU function is the most suitable activation function for the hidden layer, and the hyperbolic tangent function – for the output layer activation function. Accuracy in test and validation samples was 92.86 % and 91.03 %, respectively. Originality. The developed software model, which uses the Python 3.5 programming language, the integrated development environment PyCharm 2016.3 and the Tensorflow 1.2 framework, makes it possible to detect all types of attacks of DoS, U2R, R2L, Probe classes. Practical value. Graphical dependencies of accuracy of neural networks at various parameters are received: speed of training; activation function; optimization algorithm. The optimal parameters of neural networks have been determined, which will ensure a sufficiently high level of reliability of intrusion detection into a computer network.
目的。本文旨在开发一种检测计算机网络攻击的方法。为了实现这一目标，解决了以下任务:开发一种基于神经网络集合的计算机网络攻击检测方法，该方法使用来自开放KDD Cup 99数据库的规范化数据;在进行机器训练时，识别神经网络的最优参数，这将为检测入侵计算机网络提供足够高的可靠性。方法。作为攻击检测模块的体系结构解决方案，提出了一个基于多层感知器类型的五个神经网络集成的两级网络系统。第一个确定神经网络的攻击类别(DoS、R2L、U2R、Probe)或没有攻击的事实;其他神经网络-检测攻击类型，如果有的话(这四个神经网络中的每一个都对应于一类攻击，并且能够识别只属于该类的类型)。发现。利用建立的软件模型对神经网络配置41-1-132-5的参数进行了研究，确定了计算机网络上攻击类的类别。确定最佳训练速度为0.001。ADAM算法被证明是最优的优化算法。ReLU函数是最适合隐藏层的激活函数，而双曲正切函数-是最适合输出层的激活函数。试验样品和验证样品的准确度分别为92.86%和91.03%。创意。所开发的软件模型使用Python 3.5编程语言，集成开发环境PyCharm 2016.3和Tensorflow 1.2框架，可以检测DoS、U2R、R2L、Probe类的所有类型的攻击。实用价值。得到了不同参数下神经网络精度的图形依赖关系:训练速度;激活功能;优化算法。确定了神经网络的最优参数，保证了计算机网络入侵检测具有足够高的可靠性。
{"title":"DETECTION OF ATTACKS ON A COMPUTER NETWORK BASED ON THE USE OF NEURAL NETWORKS COMPLEX","authors":"I. Zhukovytskyy, V. Pakhomova, D. O. Ostapets, O. Tsyhanok","doi":"10.15802/stp2020/218318","DOIUrl":"https://doi.org/10.15802/stp2020/218318","url":null,"abstract":"Purpose. The article is aimed at the development of a methodology for detecting attacks on a computer network. To achieve this goal the following tasks were solved: to develop a methodology for detecting attacks on a computer network based on an ensemble of neural networks using normalized data from the open KDD Cup 99 database; when performing machine training to identify the optimal parameters of the neural network which will provide a sufficiently high level of reliability of detection of intrusions into the computer network. Methodology. As an architectural solution of the attack detection module, a two-level network system is proposed, based on an ensemble of five neural networks of the multilayer perceptron type. The first neural network to determine the category of attack class (DoS, R2L, U2R, Probe) or the fact that there was no attack; other neural networks – to detect the type of attack, if any (each of these four neural networks corresponds to one class of attack and is able to identify types that belong only to this class). Findings. The created software model was used to study the parameters of the neural network configuration 41–1–132–5, which determines the category of the attack class on the computer network. It is determined that the optimal training speed is 0.001. The ADAM algorithm proved to be the best for optimization. The ReLU function is the most suitable activation function for the hidden layer, and the hyperbolic tangent function – for the output layer activation function. Accuracy in test and validation samples was 92.86 % and 91.03 %, respectively. Originality. The developed software model, which uses the Python 3.5 programming language, the integrated development environment PyCharm 2016.3 and the Tensorflow 1.2 framework, makes it possible to detect all types of attacks of DoS, U2R, R2L, Probe classes. Practical value. Graphical dependencies of accuracy of neural networks at various parameters are received: speed of training; activation function; optimization algorithm. The optimal parameters of neural networks have been determined, which will ensure a sufficiently high level of reliability of intrusion detection into a computer network.","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":"2020-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126536644","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":"STUDY OF NEGATIVE INFLUENCE OF PETROLEUM PRODUCTS ON METAL ELEMENTS OF RAILWAY INFRASTRUCTURE","authors":"Y. Zelenko, D. Zelenko, L. Neduzha","doi":"10.15802/stp2020/218353","DOIUrl":"https://doi.org/10.15802/stp2020/218353","url":null,"abstract":"","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114635102","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. Identification and methodological substantiation of ways to increase the unitized cargo transportation efficiency, which would increase the trucking company profits and the manufacturer quality customer service. Methodology. In the course of the research the following methods were used: the method of theoretical generalization and systematization to determine the peculiarities of formation of the rational routes of cargo transportation in different conditions; the analytical method to determine the factors influencing the feasibility of adopting a certain strategy of the trucking company to improve the transportation efficiency; comparison to analyze strategies to increase the cargo transportation efficiency of the trucking company when using routes of different types. Findings. The relationship between the organizational structure effectiveness of the production enterprise management and the probable problems in choosing the type of route for goods delivery to customers is defined. The authors proved that the efficiency of unitized cargo transportation depends on a well-defined strategy of increasing the road transport efficiency. Based on the conducted research the influence of economic and organizational factors on expediency of the decision concerning rational strategy of transportation efficiency maintenance is estimated. Three types of strategies are proposed, the content of which is reflected in the receipt of additional profit by the transport company from the production enterprise, when using pendulum routes by saving its resources (return of returnable packaging) and by finding cargo on the way back, as well as using delivery-assembling routes while minimizing fines for late goods delivery. The dependence visualization of the amount of the trucking company profit on the type of strategy adopted allows us to assess the prospects for the introduction of certain types of freight vehicles routes. Originality. Methodical approaches to ways substantiation of the trucking company profit increase, choosing their rational route according to the efficiency increase strategy of unitized cargo transportations from the manufacturer to clients have received further development. Practical value. The obtained results are aimed at improving the methodological approaches to optimizing the unitized cargo routes, based on the choice of two types of routes in certain conditions, the first is the pendulum route with simultaneous receipt of applications for goods delivery, the second – the delivery-assembling routes, taking into account fines for late delivery.
{"title":"SEARCH AND JUSTIFICATION OF WAYS TO INCREASE THE UNITIZED CARGO TRANSPORTATION EFFICIENCY","authors":"Y. Litvinova, O. D. Baranovsky","doi":"10.15802/stp2020/217765","DOIUrl":"https://doi.org/10.15802/stp2020/217765","url":null,"abstract":"Purpose. Identification and methodological substantiation of ways to increase the unitized cargo transportation efficiency, which would increase the trucking company profits and the manufacturer quality customer service. Methodology. In the course of the research the following methods were used: the method of theoretical generalization and systematization to determine the peculiarities of formation of the rational routes of cargo transportation in different conditions; the analytical method to determine the factors influencing the feasibility of adopting a certain strategy of the trucking company to improve the transportation efficiency; comparison to analyze strategies to increase the cargo transportation efficiency of the trucking company when using routes of different types. Findings. The relationship between the organizational structure effectiveness of the production enterprise management and the probable problems in choosing the type of route for goods delivery to customers is defined. The authors proved that the efficiency of unitized cargo transportation depends on a well-defined strategy of increasing the road transport efficiency. Based on the conducted research the influence of economic and organizational factors on expediency of the decision concerning rational strategy of transportation efficiency maintenance is estimated. Three types of strategies are proposed, the content of which is reflected in the receipt of additional profit by the transport company from the production enterprise, when using pendulum routes by saving its resources (return of returnable packaging) and by finding cargo on the way back, as well as using delivery-assembling routes while minimizing fines for late goods delivery. The dependence visualization of the amount of the trucking company profit on the type of strategy adopted allows us to assess the prospects for the introduction of certain types of freight vehicles routes. Originality. Methodical approaches to ways substantiation of the trucking company profit increase, choosing their rational route according to the efficiency increase strategy of unitized cargo transportations from the manufacturer to clients have received further development. Practical value. The obtained results are aimed at improving the methodological approaches to optimizing the unitized cargo routes, based on the choice of two types of routes in certain conditions, the first is the pendulum route with simultaneous receipt of applications for goods delivery, the second – the delivery-assembling routes, taking into account fines for late delivery.","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"80 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124779698","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":"DETERMINATION AND ANALYSIS OF TECHNICAL PARAMETERS OF THE BENCH FOR RAILWAY WHEELS COMPLEX TESTS","authors":"S. Raksha, P. H. Anofriiev, O. Kuropiatnyk","doi":"10.15802/stp2020/217771","DOIUrl":"https://doi.org/10.15802/stp2020/217771","url":null,"abstract":"","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"172 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124183138","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. An integral and essential feature of the modern wagon fleet is its large scale. For the entire fleet of rolling stock, even the smallest structural changes take on enormous proportions. The aim of the work is a theoretical study of the influence of the inertial characteristics of bodies of various types of freight rolling stock, taking into account the loading mode and the movement speed, on their main dynamic and interaction indicators with the track structure. Methodology. Theoretical studies were carried out by the method of mathematical and computer modeling of the dynamic load during the movement of some types of freight cars: gondola cars model 12-532, hopper cars for transporting coal model 12-4034 and flat wagons model 13-401 on standard bogies 18-100 at speeds in the range from 50 to 90 km/h on curves of small and medium radii. Findings. The analysis of theoretical studies of the dynamic qualities and interaction indicators of freight rolling stock and the railway track is presented. In the course of theoretical studies and after modeling taking into account the oscillation processes of freight cars at different loading modes the dependences of the main dynamic indicators on the movement speed were obtained. Originality. The influence of inertial characteristics of bodies of various types of freight rolling stock and loading modes on the dynamic load of a car was first explored in order to solve the problem of predicting the rolling stock dynamics and indicators of its interaction with the track. The results of theoretical studies taking into account the movement speed along curved track sections of small and medium radius were obtained. Practical value. The presented calculation results make it possible to determine the optimal values of such parameters as dead weight, height of the mass center and car base length when solving the problems of modernizing the operated car fleet and determining the reserves for increasing their carrying capacity. They make it possible to solve the problems of finding the optimal directions for modernizing the rail vehicle; contribute to the creation of technical conditions for the manufacture of new and modernization of the operated freight cars and are aimed at increasing the level of reliability and safety of the transportation process in modern conditions on the railway transport.
{"title":"INTERACTION DYNAMICS OF SOME TYPES OF FREIGHT CARS WITH A RAILWAY TRACK","authors":"A. Shvets","doi":"10.15802/stp2020/217649","DOIUrl":"https://doi.org/10.15802/stp2020/217649","url":null,"abstract":"Purpose. An integral and essential feature of the modern wagon fleet is its large scale. For the entire fleet of rolling stock, even the smallest structural changes take on enormous proportions. The aim of the work is a theoretical study of the influence of the inertial characteristics of bodies of various types of freight rolling stock, taking into account the loading mode and the movement speed, on their main dynamic and interaction indicators with the track structure. Methodology. Theoretical studies were carried out by the method of mathematical and computer modeling of the dynamic load during the movement of some types of freight cars: gondola cars model 12-532, hopper cars for transporting coal model 12-4034 and flat wagons model 13-401 on standard bogies 18-100 at speeds in the range from 50 to 90 km/h on curves of small and medium radii. Findings. The analysis of theoretical studies of the dynamic qualities and interaction indicators of freight rolling stock and the railway track is presented. In the course of theoretical studies and after modeling taking into account the oscillation processes of freight cars at different loading modes the dependences of the main dynamic indicators on the movement speed were obtained. Originality. The influence of inertial characteristics of bodies of various types of freight rolling stock and loading modes on the dynamic load of a car was first explored in order to solve the problem of predicting the rolling stock dynamics and indicators of its interaction with the track. The results of theoretical studies taking into account the movement speed along curved track sections of small and medium radius were obtained. Practical value. The presented calculation results make it possible to determine the optimal values of such parameters as dead weight, height of the mass center and car base length when solving the problems of modernizing the operated car fleet and determining the reserves for increasing their carrying capacity. They make it possible to solve the problems of finding the optimal directions for modernizing the rail vehicle; contribute to the creation of technical conditions for the manufacture of new and modernization of the operated freight cars and are aimed at increasing the level of reliability and safety of the transportation process in modern conditions on the railway transport.","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":"2020-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132683893","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 propose to develop a mathematical model for the calculated determination of residual stresses in arbitrary layer of a thermal gas coating based on the change magnitude in the base geometry (sample deflection) and the variation law of the layer thickness derivative, further regulation of these stresses by changing the technological parameters of spraying for each type of sprayed coating. Methodology. Based on known works on stress detection of in welded joints, the approach of determination of samples deflection after layer-by-layer spraying was developed. These deflection parameters are the basis for the developed mathematical model of influence on the stress state. The data on the study of the main types of residual (internal) stresses, as I type, distributed in the volume of the whole part (sample) with coating, and II type, localized in the volume of sprayed particles, are systematized. Findings. We presented investigations of the residual stresses arising in the applied layer, the magnitude and nature of the distribution of which depend on the type, base and sprayed materials, methods and parameters of spraying, the rigidity of the part, and other factors. The important role of evaluating residual stresses in a thermal gas coating by the calculation method is shown in connection with the complexity of the experimental determination of the kinetics of stress development in the coating-base composite. Originality. The authors of this work, on the basis of the first created mathematical model and software product Mathcad-Prime 6 2020, conducted a study of the level and principles of the formation of residual stresses in the coating during gas-thermal layer-by-layer spraying with various material, including the possibility of using a pulsating spraying air flow. Analytical studies have shown that the attention in the literature over the past five to seven years has been paid only to the study of residual stresses and deformations in welded joints, and only the growing interest in spraying technology opens up wide possibilities for studying the formation of stress fields in a thermal gas coating. Practical relevance. The results obtained in this paper confirm the formation of residual stresses in coatings and can be used as computational programs to solve design tasks, as well as for educational purposes during experts training in engineering fields.
{"title":"DETECTION OF RESIDUAL STRESSES IN COATINGS OBTAINED BY THE METHOD OF ARC METALLIZATION WITH A PULSATING SPRAYING FLOW","authors":"O. M. Serenko, I. Zakharova","doi":"10.15802/stp2020/217611","DOIUrl":"https://doi.org/10.15802/stp2020/217611","url":null,"abstract":"Purpose. The authors propose to develop a mathematical model for the calculated determination of residual stresses in arbitrary layer of a thermal gas coating based on the change magnitude in the base geometry (sample deflection) and the variation law of the layer thickness derivative, further regulation of these stresses by changing the technological parameters of spraying for each type of sprayed coating. Methodology. Based on known works on stress detection of in welded joints, the approach of determination of samples deflection after layer-by-layer spraying was developed. These deflection parameters are the basis for the developed mathematical model of influence on the stress state. The data on the study of the main types of residual (internal) stresses, as I type, distributed in the volume of the whole part (sample) with coating, and II type, localized in the volume of sprayed particles, are systematized. Findings. We presented investigations of the residual stresses arising in the applied layer, the magnitude and nature of the distribution of which depend on the type, base and sprayed materials, methods and parameters of spraying, the rigidity of the part, and other factors. The important role of evaluating residual stresses in a thermal gas coating by the calculation method is shown in connection with the complexity of the experimental determination of the kinetics of stress development in the coating-base composite. Originality. The authors of this work, on the basis of the first created mathematical model and software product Mathcad-Prime 6 2020, conducted a study of the level and principles of the formation of residual stresses in the coating during gas-thermal layer-by-layer spraying with various material, including the possibility of using a pulsating spraying air flow. Analytical studies have shown that the attention in the literature over the past five to seven years has been paid only to the study of residual stresses and deformations in welded joints, and only the growing interest in spraying technology opens up wide possibilities for studying the formation of stress fields in a thermal gas coating. Practical relevance. The results obtained in this paper confirm the formation of residual stresses in coatings and can be used as computational programs to solve design tasks, as well as for educational purposes during experts training in engineering fields.","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"160 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116213935","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}
V. H. Ravliuk, M. H. Ravliuk, I. Kyrychenko, N. Lamnauer, A. Melnychuk
Purpose. This study aims to use linear models to determine the wear of brake pads of freight cars at the top and bottom for further use in solving similar practical problems. Methodology. As a working technique the known approach for controlling linear wear changes of pad parameters depending on freight cars run on a network of Ukrzaliznytsia JSC with the modernized brake levers in real operating conditions is used. Based on the obtained statistical data in the operating conditions, we the consistently found values of the corresponding regression analysis indi-cators for pad wear at specific points, which are recommended by regulatory documents when performing mainte-nance in operational units of car facilities for brake systems of freight cars. Findings. A probabilistic-statistical model of brake pad wear is constructed on the basis of experimental data collected in the respective parks of the sorting station during the operation of freight cars. The function of wear distribution for the top and bottom part of a pad by means of which the decision of practical problems is possible is offered. Also for different parts of the brake pad found its γ-percentage and average residual wear. Originality. For the first time for the brake pads of freight cars with modernized devices, the functional dependence of their wear depending on the run of cars on the network of Ukrzaliznytsia JSC was determined. Based on the received dependence the statistical model of pad wear taking into account possibilities of their use before full resource exhaustion is developed. The function of distribution of run of freight cars taking into account pad wear due to which the wear percent at the set run is also defined. Practical value. The results obtained in the work will be taken into account in the future to solve technical problems related to non-standard wear of pads in the brake systems of bogies and increase the service life of freight cars.
{"title":"PROBABILITY AND STATISTICAL MODEL OF WEARING OF BRAKE PADS OF FREIGHT CARS","authors":"V. H. Ravliuk, M. H. Ravliuk, I. Kyrychenko, N. Lamnauer, A. Melnychuk","doi":"10.15802/stp2020/217633","DOIUrl":"https://doi.org/10.15802/stp2020/217633","url":null,"abstract":"Purpose. This study aims to use linear models to determine the wear of brake pads of freight cars at the top and bottom for further use in solving similar practical problems. Methodology. As a working technique the known approach for controlling linear wear changes of pad parameters depending on freight cars run on a network of Ukrzaliznytsia JSC with the modernized brake levers in real operating conditions is used. Based on the obtained statistical data in the operating conditions, we the consistently found values of the corresponding regression analysis indi-cators for pad wear at specific points, which are recommended by regulatory documents when performing mainte-nance in operational units of car facilities for brake systems of freight cars. Findings. A probabilistic-statistical model of brake pad wear is constructed on the basis of experimental data collected in the respective parks of the sorting station during the operation of freight cars. The function of wear distribution for the top and bottom part of a pad by means of which the decision of practical problems is possible is offered. Also for different parts of the brake pad found its γ-percentage and average residual wear. Originality. For the first time for the brake pads of freight cars with modernized devices, the functional dependence of their wear depending on the run of cars on the network of Ukrzaliznytsia JSC was determined. Based on the received dependence the statistical model of pad wear taking into account possibilities of their use before full resource exhaustion is developed. The function of distribution of run of freight cars taking into account pad wear due to which the wear percent at the set run is also defined. Practical value. The results obtained in the work will be taken into account in the future to solve technical problems related to non-standard wear of pads in the brake systems of bogies and increase the service life of freight cars.","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130322786","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}
V. Zurnadzhy, V. Voloshyn, R. Kussa, V. Efremenko, A. V. Dzherenova, O. V. Tsvetkova
{"title":"MODERN STRUCTURAL STEELS WITH TRIP-EFFECT","authors":"V. Zurnadzhy, V. Voloshyn, R. Kussa, V. Efremenko, A. V. Dzherenova, O. V. Tsvetkova","doi":"10.15802/stp2020/212955","DOIUrl":"https://doi.org/10.15802/stp2020/212955","url":null,"abstract":"","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115880183","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 goal is to point out that the new geometric design of the curves of tramways is recommended, furthermore the introduction of a new parameter too. This new parameter is the Creepage Index (CI), which takes into consideration the values of wheel creep from the optimal rolling radii difference on every wheelset in the bogie. Methodology. The several types of railprofiles and railway wheel tread profile geometres have been analised with a special softver and compared with standards, TSIs and BOStrab. Findings. The result of the analisys is that the mechanical conformity of rail/wheel interaction (running characteristic) in tramway tracks are unfavourable and new regulations are necessary to reduce the rail/wheel wear and corrugation especially in curves with small radii. Originality. In the EU the Technical Specifications for Interoperability (TSI) are in force, which regulate the parameters of running behaviour for the international and national public railways. However, the regulation does not apply to domestic tramways. In the course of the analysis, the author propose to introduce a system of regulation, which based on the mechanical suitability of the rail/wheel interaction. This is especially justified, because for example the regulation of German light rails (BOStrab) only requires the geometric dimensions of the wheel and the groove of the rail and their limits. Practical value. The author developed new geometric design and limit systems of narrow curves and straight tracks and a new test parameter, which shows degree of coherence for running characteristic of the given curve and vehicle, from the aspect of infrastructure, in case of all wheelsets of bogie. This CI (Creepage Index) parameter takes into account all wheel creep values resulting from the variations (+, –) of the optimum rolling radius difference. This results the tightening of bogie design principles and for running characteristic reasons, it requires the continous flange running of the outer wheel in narrow curves.
{"title":"ANALYSIS OF RAIL-WHEEL INTERACTION IN CURVES WITH SMALL RADII","authors":"R. Csépke","doi":"10.15802/stp2020/213180","DOIUrl":"https://doi.org/10.15802/stp2020/213180","url":null,"abstract":"Purpose. The authors goal is to point out that the new geometric design of the curves of tramways is recommended, furthermore the introduction of a new parameter too. This new parameter is the Creepage Index (CI), which takes into consideration the values of wheel creep from the optimal rolling radii difference on every wheelset in the bogie. Methodology. The several types of railprofiles and railway wheel tread profile geometres have been analised with a special softver and compared with standards, TSIs and BOStrab. Findings. The result of the analisys is that the mechanical conformity of rail/wheel interaction (running characteristic) in tramway tracks are unfavourable and new regulations are necessary to reduce the rail/wheel wear and corrugation especially in curves with small radii. Originality. In the EU the Technical Specifications for Interoperability (TSI) are in force, which regulate the parameters of running behaviour for the international and national public railways. However, the regulation does not apply to domestic tramways. In the course of the analysis, the author propose to introduce a system of regulation, which based on the mechanical suitability of the rail/wheel interaction. This is especially justified, because for example the regulation of German light rails (BOStrab) only requires the geometric dimensions of the wheel and the groove of the rail and their limits. Practical value. The author developed new geometric design and limit systems of narrow curves and straight tracks and a new test parameter, which shows degree of coherence for running characteristic of the given curve and vehicle, from the aspect of infrastructure, in case of all wheelsets of bogie. This CI (Creepage Index) parameter takes into account all wheel creep values resulting from the variations (+, –) of the optimum rolling radius difference. This results the tightening of bogie design principles and for running characteristic reasons, it requires the continous flange running of the outer wheel in narrow curves.","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":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128890500","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 article is to pose a new task for planning the processes of service systems functioning, as well as the development of constructive methods for modeling complex processes and systems by developing multilayer constructive model for ordering sets of inhomogeneous order sequences (MLCPM), which takes into account the complexity of formation operations. Methodology. The paper proposes the formulation of a new modeling problem, designed for ordering heterogeneous sequences of elements (orders). The studied results were used in logistics, technological, information and other processes. The main and essential difference of the proposed constructive multilayer models is the introduction of additional design structures into their composition, which provides the ability to set the complexity of the formation operations, as well as the possibility of additional analysis of the properties of objects that are formed during the adoption of decisions. Procedures of optimal control of the processes of finding decision are also being implemented by means of MLCRM. Findings. Using the example of the problem of optimal making- and breaking-up of multi-group trains, a new multilayer constructive model of optimal planning processes for ordering sets of heterogeneous order sequences has been developed. The article proposes a classification of features that determine the types of mathematical models of ordering processes. Originality. The article formulates a new scientific and applied problem for the planning of service systems, for the first time, the classification of signs of mathematical model classes of ordering processes of order sequences with the weight of operations was carried out. In the article, constructive-production models were developed, which was done by creating multilayer and parallel structural modeling structures for making- and breaking-up of trains. Practical value. The practical value of the results is determined by a wide range of possible applications of the proposed task for the planning of service systems. The proposed multilayer structural modeling structures allow improving the tools of constructive modeling. The constructed model of the processes of optimal making- and breaking-up of trains allows obtaining a new form of implementation of these technological processes of railway transport.
{"title":"КОНСТРУКТИВНІ БАГАТОШАРОВІ МОДЕЛІ ДЛЯ УПОРЯДКУВАННЯ ПОСЛІДОВНОСТЕЙ З УРАХУВАННЯМ СКЛАДНОСТІ ОПЕРАЦІЙ ФОРМУВАННЯ","authors":"V. Skalozub, V. M. Ilman, B. B. Bilyy","doi":"10.15802/STP2020/213232","DOIUrl":"https://doi.org/10.15802/STP2020/213232","url":null,"abstract":"Purpose. The aim of the article is to pose a new task for planning the processes of service systems functioning, as well as the development of constructive methods for modeling complex processes and systems by developing multilayer constructive model for ordering sets of inhomogeneous order sequences (MLCPM), which takes into account the complexity of formation operations. Methodology. The paper proposes the formulation of a new modeling problem, designed for ordering heterogeneous sequences of elements (orders). The studied results were used in logistics, technological, information and other processes. The main and essential difference of the proposed constructive multilayer models is the introduction of additional design structures into their composition, which provides the ability to set the complexity of the formation operations, as well as the possibility of additional analysis of the properties of objects that are formed during the adoption of decisions. Procedures of optimal control of the processes of finding decision are also being implemented by means of MLCRM. Findings. Using the example of the problem of optimal making- and breaking-up of multi-group trains, a new multilayer constructive model of optimal planning processes for ordering sets of heterogeneous order sequences has been developed. The article proposes a classification of features that determine the types of mathematical models of ordering processes. Originality. The article formulates a new scientific and applied problem for the planning of service systems, for the first time, the classification of signs of mathematical model classes of ordering processes of order sequences with the weight of operations was carried out. In the article, constructive-production models were developed, which was done by creating multilayer and parallel structural modeling structures for making- and breaking-up of trains. Practical value. The practical value of the results is determined by a wide range of possible applications of the proposed task for the planning of service systems. The proposed multilayer structural modeling structures allow improving the tools of constructive modeling. The constructed model of the processes of optimal making- and breaking-up of trains allows obtaining a new form of implementation of these technological processes of railway transport.","PeriodicalId":120413,"journal":{"name":"Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport","volume":"162 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114679667","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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