Modern technologies. System analysis. Modeling最新文献

{"title":"Development and modeling of an automated wheelset repair line","authors":"А. Рожкова, В. А. Ковригина, E. Rozhkova, I. Kovrigina, D. G. Nalabordin","doi":"10.26731/1813-9108.2020.3(67).32-40","DOIUrl":"https://doi.org/10.26731/1813-9108.2020.3(67).32-40","url":null,"abstract":"Every year the railcar fleet is being improved more and more, the latest railcars are being designed and implemented. There is an increase in the number of units of rolling stock and an increase in the railcar turnaround. All these and many other factors, of course, require improved maintenance and faster repairs. In this case, the cost of repair and its quality should not deteriorate. The best solu-tion is to introduce automation in the railcar repair process, which will increase labor productivity, thereby increasing the volume of finished products, ease working conditions for the staff and improve the quality indicators of the railcar repair industry. The present work considers an increase in the efficiency of wheelsets turning processes due to the introduction of automation of the process itself. The possibility of improving the production process is achieved by assigning optimal process conditions, in particular, by automating the measurement of the wheelset tread and assigning turning parameters. The above statistical analysis of railcar uncouplings for routine repairs showed that annually more than 800 thousand railcars are uncoupled on the road network for unscheduled repairs, of which 48 % are wheelset malfunctions. Thus the issues associated with studying the reliability indicators of wheelsets in operation and their organization repairs remain relevant for the railcar economy of railways. As a result of statistical modeling, it was proved that the running time of the wheelset before the first turning obeys the normal distribution law, and the mathematical expectation of working hours before the first turning is 86 thousand km.","PeriodicalId":175652,"journal":{"name":"Modern technologies. System analysis. Modeling","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115098673","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":"Physics and technology of strengthening of polymeric insulation material of electric machines using thermal radiation","authors":"","doi":"10.26731/1813-9108.2020.3(67).108-116","DOIUrl":"https://doi.org/10.26731/1813-9108.2020.3(67).108-116","url":null,"abstract":"This article is aimed at considering infrared radiation from the viewpoint of compatibility of the impact of thermal energy generated in various types of emitters and polymer insulating material used during the manufacture or repair of electrical machines of traction rolling stock. The results of the local heating process with short-wave, medium-wave, and long-wave heat radiation of samples of glass-and-mica tapes impregnated in liquid electrical insulating polymer varnishes widely used for insulation of windings of electrical machines of traction rolling stock are clearly described. The physics and technology of the occurrence of thermal radiation using ceramic emitters, as well as the properties and role of a functional ceramic coating during the formation of pulsed narrow-band radiation and a high heat transfer rate, are extensively analyzed. The dependence of the emissivity factor on the specific resistivity of the material of the infrared emitter, as well as on its temperature, is shown using classical Maxwell’s equations. On the basis of the studies performed, the result of using the most efficient thermal infrared radiation generator is obtained. This allows us to judge that the application of emitters with low resistivity to restore the electrical insulation of bodies results in large losses of electricity, which means it is energetically inefficient when used intensively. It is noted that only infrared emitters with properties close to a completely black body are suitable for this purpose, namely, ceramic emitters with a darkened surface on the front side and a golden coating on the opposite side. The prospects for the development of the technology using the technology of microarc oxidation, the main property of which is the possibility of regulating the heating parameters, as well as the emergence of modified structures with special properties, are considered. The practical application of thermal radiation in locomotive engineering will make it possible to achieve a perfectly smooth surface of insulating structures, particularly, insulating fingers of the support brackets of the brush holders of traction electric motors. As a result of which, there will be no microdefects and porosities that are characteristic of traditional convective drying.","PeriodicalId":175652,"journal":{"name":"Modern technologies. System analysis. Modeling","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128203955","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":"The study of a diverging flow in the gap between the walls with the formation of annular rarefaction zones","authors":"П. Черепанов, П. К. Ляпустин, A. P. Cherepanov, P. Lyapustin, V. Elshin","doi":"10.26731/1813-9108.2020.3(67).22-31","DOIUrl":"https://doi.org/10.26731/1813-9108.2020.3(67).22-31","url":null,"abstract":"The article considers the flow diverging in a slit gap between two closely spaced walls with a transverse flow supply to the gap through a central hole in one of the walls. It shows the main statements of the hypothesis and analyzes the current state of research on the flow of compressible media. It is assumed that the flow moves continuously in the gap with the formation of annular rarefaction zones. This process has not been studied in practice, but there is evidence that annular zones are formed in the gap directly behind the nozzle edge, in which rarefaction alternates with increased pressure. Studies have shown that behind the first annular zone, a second and even a third annular zone of rarefaction are detected. It is also established that if one of the plates is made of a resilient or elastic material, then due to the rarefaction in the annular zones, the plate will execute oscillatory move-ments. Therefore, the proposed work attempts to study the nature of the continuous flow between the plates and provides a justi-fication for the undulating flow in the gap, which causes a reduced (rarefaction) and increased (above atmospheric) pressure in the annular zones between closely located plates. By the example of a simplified mathematical model of continuous flow, some of its parameters are determined in the resulting annular zones. Field studies have observed that as the flow moves away from the feed nozzle, there is a change in the pressure of the diverging flow. The study was conducted not with the help of pressure gauges and vacuum meters, as it is usually accepted, but with the help of receptors containing discrete jet logic elements, the sensitivity of which is slightly higher than, for example, pressure gauges and vacuum meters. At the same time, the distribution of the flow in the gap with the formation of concentric annular zones (cavities), depending on the pressure and flow rate passing through the feed channel, the flow rate in the gap, the presence and size of these zones were determined. Research has been conducted using fairly simple units, but it has shown some practical applications of this flow. They can be useful in the development of a wide range of different devices, and specifically for recognizing the position, orientation and capture of plate parts during automatic assembly. The paper also shows the possibility of ejecting and multicomponent mixing of fluids to form gas-liquid mixtures in heat and mass transfer processes during absorption, rectification, dispersion, emulsification, creating vibration to clean walls from deposits, as well as in other technologies and devices.","PeriodicalId":175652,"journal":{"name":"Modern technologies. System analysis. Modeling","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132314597","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":"Modeling of electromagnetic influence of traction networks on pipelines in case of complex approach paths","authors":"","doi":"10.26731/1813-9108.2020.3(67).116-125","DOIUrl":"https://doi.org/10.26731/1813-9108.2020.3(67).116-125","url":null,"abstract":"The purpose of the computer research presented in the article was to develop a methodology for simulating the electromagnetic influence of traction networks of AC railways on pipelines laid on the ground surface. The paper considers situations corresponding to the complex paths for pipelines approaching railway lines. The simulation was carried out in the Fazonord software package developed at Irkutsk State Transport University. In this software package, a lattice equivalent circuit of a multi-wire system is formed by using expressions for the internal and mutual resistances of individual conductors. In this case, an algorithm for implementing Carson's formulas is applied, which is acceptable from the viewpoint of coverage of the near, intermediate, and far zones and has sufficient speed for multiple calculations carried out to account for the displacement of traction loads. Modeling results are presented for an example of a 25-kV traction network and a pipeline laid on the ground. The situation of a complex path for the traction network approaching the pipeline was consid-ered. For comparison, calculations were performed with parallel approximation. It is shown that the maximum induced voltage in the latter case can exceed 100 V. For a complex path, this indicator is 85 V, but also exceeds the permissible value of 60 V. In order to en-sure safe working conditions for the personnel, measures are required to lower the induced voltages. The proposed methodology can be used to solve practical problems associated with the design and operation of oil and gas transport pipeline sections approaching routes of electrified alternating current railways. The methodology is multiple-function and can be used for any trajectory of pipelines approaching traction networks. It is possible to take into account the unequal electrical characteristics of soils in individual sections of the approach. This work was financially supported by a grant on the topic “Improving the quality of electric energy and electromagnetic safety in power supply systems of railways equipped with Smart Grid devices by applying methods and means of mathematical modeling based on phase coordinates”. paths]. Sovremennye tekhnologii. Sistemnyi analiz. Modelirovanie [ Modern Technologies.","PeriodicalId":175652,"journal":{"name":"Modern technologies. System analysis. Modeling","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127807956","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":"Comparative analysis of methods for solving transport problems with optimal planning of the transportation process","authors":"А. Лебедева, Е. Гозбенко, А. А. Пыхалов, Юрий Федорович Мухопад, O. Lebedeva, V. Gozbenko, A. Pykhalov, Y. Mukhopad","doi":"10.26731/1813-9108.2020.3(67).134-139","DOIUrl":"https://doi.org/10.26731/1813-9108.2020.3(67).134-139","url":null,"abstract":"Transport modeling is associated with the optimization (finding the best possible solution) of the transportation network. This research aims to fully satisfy the freight demand within the limits of production capacity at the lowest possible cost. Is conciders the statement of the problem of the transport model with respect to optimization criteria (cost, time). The main algorithms are presented that allow finding basic solutions using Vogel’s methods, methods of northwest corner, least cost, double preference, as well as the potential method and the distribution method for finding the optimal solution. Basic algorithms for finding the initial path are presented. According to the test results, the lowest transport costs were shown by the Vogel’s method, which is con-sidered the most labor-intensive, but the transportation plan constructed using this method is often close to or is optimal. Using tested methods for constructing an initial plan, a basic plan can be obtained. The distribution method and the potential method were used to find the optimal solution. Testing has shown that both the potential method and the distribution method gave the same values when finding the optimal solution, regardless of the initial solution method. As a result, we can conclude that it is possible to apply various methods of linear programming when solving transport problems, but their effectiveness will depend on many factors, such as the characteristics of transportation, restrictions, the used objective function and others. Testing transport planning methods makes it possible to find the optimal solution by applying an iterative process. This significantly reduces the complexity and labor costs of calculations, and assumes the use of optimization methods in modeling the transport network and transport planning.","PeriodicalId":175652,"journal":{"name":"Modern technologies. System analysis. Modeling","volume":"164 7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127533356","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":"Analysis of options for enhancing the power supply system of the Slyudyanka-Goncharovo section of the East-Siberian railway","authors":"","doi":"10.26731/1813-9108.2020.3(67).80-90","DOIUrl":"https://doi.org/10.26731/1813-9108.2020.3(67).80-90","url":null,"abstract":"","PeriodicalId":175652,"journal":{"name":"Modern technologies. System analysis. Modeling","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121888001","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":"Development of a method for calculating the dependence of the rotational speed of a flat-blade impeller with a pipe on the fluid flow","authors":"A. Bal'chugov, B. O. Kustov, A. Badenikov","doi":"10.26731/1813-9108.2020.3(67).16-22","DOIUrl":"https://doi.org/10.26731/1813-9108.2020.3(67).16-22","url":null,"abstract":"The article presents a developed methodology for calculating the dependence of the rotational speed of a flat-blade impeller with a pipe on the flow rate of fluid in the pipe and the results of experimental verification of the proposed methodology. The rele-vance of the work stems from the fact that devices with a rotating impeller and a tube are promising for the intensification of the heat transfer process, and, currently, there is no acceptable engineering methodology for their calculation. The calculation method is based on a modified classical equation of motion of the impeller, presented in the form of a balance of the driving moment of rotation of the impeller and the sum of the moments of loss, taking into account the moment of friction in the pipe that rotates together with the impeller and taking into account the mass of the rotating fluid. The calculation procedure is valid for flat-blade impellers with an impeller wheel having cone-shaped protrusions at the ends, provided that the impeller blades are rigidly at-tached to the pipe walls. It is shown that, according to the calculation results, due to the friction energy loss in the rotating pipe, the impeller, bearing supports and lip-type sealings, the flat-blade impeller rotation speed decreases by 9,4 % compared to the maximum (ideal rotation speed). The proposed calculation method allows one to obtain a linear equation of the dependence of the impeller speed on the flow rate of the fluid in the pipe with an approximation reliability 0,968 in the range of water flow rate 1,7–3,4 m 3 /h. An experimental verification of the calculated dependence, obtained as a result of calculation by this method, was performed. The permissible deviation of the calculation results from the experimental results in the amount of 8,1–14,7 % is ob-served within the range of water flow rate 1,95–2,8 m 3 /h. If the water flow rate is less than 1,7 m 3 /h, the pipe rotation wasn’t steady. The developed calculation procedure and the obtained equations of the dependence of the rotation speed on the water flow will be in demand in the development of new devices to intensify heat transfer processes due to the fact that a fluid flow rotates the impeller with the heat exchange pipe.","PeriodicalId":175652,"journal":{"name":"Modern technologies. System analysis. Modeling","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128944931","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":"A simulation model of traction power supply system to determine energy indicators in conditions of energy storage system operation","authors":"","doi":"10.26731/1813-9108.2020.3(67).70-80","DOIUrl":"https://doi.org/10.26731/1813-9108.2020.3(67).70-80","url":null,"abstract":"","PeriodicalId":175652,"journal":{"name":"Modern technologies. System analysis. Modeling","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114803375","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":"Evaluation of the compatibility of the traction power supply system during implementation of train traffic separation using the “virtual coupling” technology","authors":"П. Асташков, А. Оленцевич, Ю. И. Белоголов, N. Astashkov, V. A. Olentsevich, Yu. I. Belogolov, V. V. Kashkowsky","doi":"10.26731/1813-9108.2020.3(67).173-180","DOIUrl":"https://doi.org/10.26731/1813-9108.2020.3(67).173-180","url":null,"abstract":"One of the main directions for improving the transportation process in the railway transport system for today is the development of train separation technology, the use of which will allow determining the distance between trains not by clear block sections, but by focusing on the current location of the rolling stock. The practical use of the technology proposed in the article will reduce the interval of train spacing, increase the throughput capacity and carrying capacity of railway lines. In general, the effectiveness of implementing train traffic separation using the “virtual coupling” system is presented in the works of many authors, however, these works do not consider the issues of using the existing infrastructure of the traction power supply system. To compare the “virtual coupling” technology with driving linked multiple trains is to evaluate the throughput capacity reserve and train traffic schedules. The use of modern software tools for mathematical modeling will allow us to solve not only the tasks in hand, but also to assess the compatibility of the currently used traction power supply system. According to the results obtained by the authors, it can be seen that when trains move in the “virtual coupling” mode, the energy consumption, losses in the traction network, the limiting load factor, the temperature in the overhead contact system and the feeder line are lower than when during the movement of the linked multiple train. The voltage in the overhead contact system when using trains with a virtual coupling is significantly higher than when using linked multiple trains. On the basis of the above facts, it can be concluded that it is more appropriate to use trains with a virtual coupling at the considered section than linked multiple ones.","PeriodicalId":175652,"journal":{"name":"Modern technologies. System analysis. Modeling","volume":"65 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131250263","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":"Increasing the operating speed of electric rolling stock by providing smooth regulation of the excitation current of the traction electric motors","authors":"","doi":"10.26731/1813-9108.2020.3(67).166-172","DOIUrl":"https://doi.org/10.26731/1813-9108.2020.3(67).166-172","url":null,"abstract":"","PeriodicalId":175652,"journal":{"name":"Modern technologies. System analysis. Modeling","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131248232","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}