Pub Date : 2019-07-19DOI: 10.17816/TRANSSYST20195270-82
K. Voevodskii, Vladimir M. Strepetov, G. E. Sereda
Aim:to propose a technical solution to ensure the lateral stabilization of the vehicle with an electrodynamic suspension. Development of a method for calculating the levitation characteristics of a transport installation with an electrodynamic suspension in the presence of a longitudinal joint in the track. Analysis of the results of theoretical studies. Мaterials and methods: The article used the methods of the electromagnetic field theory, generalized functions, Fourier transform, analytical and numerical methods for determining quadratures. The program for PC was developed in the Fortran language. Result: to ensure lateral stabilization of the vehicle with an electrodynamic suspension, it was proposed to introduce a longitudinal insulating joint into the structure of the track bed. A mathematical model is proposed for this system of electrodynamic suspension in approximation of an infinitely wide track structure of rectangular cross section. A mathematical model is proposed for this system of electrodynamic suspension in approximation of an infinitely wide track structure of rectangular cross section. Numerical integration of these equations was performed by applying the Gauss formula and the Philo method. The results of the calculations allowed us to obtain a number of graphical dependencies of the levitation characteristics on the magnitude of the lateral displacement of the carriage electromagnet from a relatively symmetrical position. Conclusion: thus, the obtained results of the study fully meet the goal of determining the parameters of the side stabilization of the vehicle with an electrodynamic suspension with a track, containing a longitudinal joint under the assumptions made. Comparison of the proposed method with other proposed stabilization methods does not reveal the decisive advantages or disadvantages of the new method. In most cases, its most serious drawback is its low levitation quality. However, it is significantly reduced if the movement of the high speed ground transportation vehicle occurs predominantly at high speed, at which the force of aerodynamic drag prevails over the force of electrodynamic braking. Same relative is and the dignity of the system-high lateral rigidity. The reason for this is that the demands on the lateral stiffness can be quantified only formulated in relation to a particular track HSGT taking into account the timetable and other factors. In fact, the main destabilizing influences in sideways are inertia at motion on component and crosswind. Its role in choosing the stabilization system could play and other tasks the system subsystems HSGT. For example, installing additional stabilizing magnets can make it difficult to escape the passenger compartment from the magnetic field. Plays a role also principle and system design of traction. From the above it is clear that the final choice of the lateral stabilization of the research at this stage would be premature. Proposed and studied in this ar
{"title":"Levitation Characteristics of a Transport Installation with an Electrodynamic Suspension During a Longitudinal Joint with Road Track","authors":"K. Voevodskii, Vladimir M. Strepetov, G. E. Sereda","doi":"10.17816/TRANSSYST20195270-82","DOIUrl":"https://doi.org/10.17816/TRANSSYST20195270-82","url":null,"abstract":"Aim:to propose a technical solution to ensure the lateral stabilization of the vehicle with an electrodynamic suspension. Development of a method for calculating the levitation characteristics of a transport installation with an electrodynamic suspension in the presence of a longitudinal joint in the track. Analysis of the results of theoretical studies. \u0000Мaterials and methods: The article used the methods of the electromagnetic field theory, generalized functions, Fourier transform, analytical and numerical methods for determining quadratures. The program for PC was developed in the Fortran language. \u0000Result: to ensure lateral stabilization of the vehicle with an electrodynamic suspension, it was proposed to introduce a longitudinal insulating joint into the structure of the track bed. A mathematical model is proposed for this system of electrodynamic suspension in approximation of an infinitely wide track structure of rectangular cross section. \u0000A mathematical model is proposed for this system of electrodynamic suspension in approximation of an infinitely wide track structure of rectangular cross section. Numerical integration of these equations was performed by applying the Gauss formula and the Philo method. The results of the calculations allowed us to obtain a number of graphical dependencies of the levitation characteristics on the magnitude of the lateral displacement of the carriage electromagnet from a relatively symmetrical position. \u0000Conclusion: thus, the obtained results of the study fully meet the goal of determining the parameters of the side stabilization of the vehicle with an electrodynamic suspension with a track, containing a longitudinal joint under the assumptions made. \u0000Comparison of the proposed method with other proposed stabilization methods does not reveal the decisive advantages or disadvantages of the new method. In most cases, its most serious drawback is its low levitation quality. However, it is significantly reduced if the movement of the high speed ground transportation vehicle occurs predominantly at high speed, at which the force of aerodynamic drag prevails over the force of electrodynamic braking. \u0000Same relative is and the dignity of the system-high lateral rigidity. The reason for this is that the demands on the lateral stiffness can be quantified only formulated in relation to a particular track HSGT taking into account the timetable and other factors. \u0000In fact, the main destabilizing influences in sideways are inertia at motion on component and crosswind. Its role in choosing the stabilization system could play and other tasks the system subsystems HSGT. \u0000For example, installing additional stabilizing magnets can make it difficult to escape the passenger compartment from the magnetic field. Plays a role also principle and system design of traction. From the above it is clear that the final choice of the lateral stabilization of the research at this stage would be premature. \u0000Proposed and studied in this ar","PeriodicalId":100849,"journal":{"name":"Journal of Transportation Systems Engineering and Information Technology","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82469314","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}
Pub Date : 2019-07-19DOI: 10.17816/TRANSSYST20195247-59
O. Larin, A. Bokov
Background: The movement of the train in an insulated space with the natural atmospheric pressure is accompanied by energy losses for unproductive work to overcome the profile air drag from the front and rear surfaces of the vehicle. At the same time, there is also a considerable increase of energy costs for overcoming the growing force of oncoming air drag. In order to exclude these energy losses, it is proposed to organize synchronous and volume-balanced pumping of air from the front part of the tube transport and injection of the air into the back part of the tube transport. Aim: To develop a method of organising air exchange inside the tube transport, which will ensure the reduction of air resistance to the movement of the train. Methods: The proposed developments are based on well-known national and foreign designs of high-speed tube transport systems, the results of a comparative analysis of tube transport with varying degrees of air pumping (backing vacuum and hard vacuum), taking into account the experience of redistributing the residual air volume in the Hyperloop and TransPod tube transport systems. The operating parameters of the compressor units that pump air into the internal cavity of the tube when the train is in motion is regulated on the basis of process models of gas dynamics. Results: A new method and device has been developed for reducing the air drag to the movement of the train by forced air exchange, which provides for the redistribution of air from the front to the rear of the transport tube relative to the vehicle travel direction. For the air redistribution, the external air exchange unit, consisting of air ducts, compressor units, gate valves, and air collectors is used. The process of external air exchange takes place only when the vehicle is in motion, for the movement of the vehicle no prior air exhaust is required. The air redistribution is controlled taking into account the speed of the train, its location in the tube, the design features of the tunnel and vehicle. The speed of the train for each segment of the speed section is normalised depending on the actual performance of the components of the air exchange system. Modes of operation of the compressor units must ensure synchronous redistribution of air from the front to the rear of the tube. The movement of a vehicle along a tube with normal atmospheric pressure in the internal cavity provides conditions for the safe transportation of goods and passengers. Conclusion: The developed method is designed to reduce the force of air resistance when the train is in motion inside the airtight tube without creating vacuum. The presented developments have good prospects for use in projects of high-speed transport systems of both underground and underwater designs.
{"title":"Decreasing of Profile Air Drag to the Train Movement Inside the Tube Transport","authors":"O. Larin, A. Bokov","doi":"10.17816/TRANSSYST20195247-59","DOIUrl":"https://doi.org/10.17816/TRANSSYST20195247-59","url":null,"abstract":"Background: The movement of the train in an insulated space with the natural atmospheric pressure is accompanied by energy losses for unproductive work to overcome the profile air drag from the front and rear surfaces of the vehicle. At the same time, there is also a considerable increase of energy costs for overcoming the growing force of oncoming air drag. In order to exclude these energy losses, it is proposed to organize synchronous and volume-balanced pumping of air from the front part of the tube transport and injection of the air into the back part of the tube transport. \u0000Aim: To develop a method of organising air exchange inside the tube transport, which will ensure the reduction of air resistance to the movement of the train. \u0000Methods: The proposed developments are based on well-known national and foreign designs of high-speed tube transport systems, the results of a comparative analysis of tube transport with varying degrees of air pumping (backing vacuum and hard vacuum), taking into account the experience of redistributing the residual air volume in the Hyperloop and TransPod tube transport systems. The operating parameters of the compressor units that pump air into the internal cavity of the tube when the train is in motion is regulated on the basis of process models of gas dynamics. \u0000Results: A new method and device has been developed for reducing the air drag to the movement of the train by forced air exchange, which provides for the redistribution of air from the front to the rear of the transport tube relative to the vehicle travel direction. For the air redistribution, the external air exchange unit, consisting of air ducts, compressor units, gate valves, and air collectors is used. The process of external air exchange takes place only when the vehicle is in motion, for the movement of the vehicle no prior air exhaust is required. The air redistribution is controlled taking into account the speed of the train, its location in the tube, the design features of the tunnel and vehicle. The speed of the train for each segment of the speed section is normalised depending on the actual performance of the components of the air exchange system. Modes of operation of the compressor units must ensure synchronous redistribution of air from the front to the rear of the tube. The movement of a vehicle along a tube with normal atmospheric pressure in the internal cavity provides conditions for the safe transportation of goods and passengers. \u0000Conclusion: The developed method is designed to reduce the force of air resistance when the train is in motion inside the airtight tube without creating vacuum. The presented developments have good prospects for use in projects of high-speed transport systems of both underground and underwater designs.","PeriodicalId":100849,"journal":{"name":"Journal of Transportation Systems Engineering and Information Technology","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81493978","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}
Pub Date : 2019-07-19DOI: 10.17816/transsyst201952106-117
S. Smirnov, O. Smirnova
Background: Currently, the car, water, railway, air and pipe transports are used for cargo and goods transportation. Each kind of cargo transport has its own specific competitive advantages that provide its most effective application at various stages of logistics chain. The economic efficiency of cargo transportation influences the overall economic efficiency, in particular, the gross domestic product. The quality of economic growth as applied to transport branch and its input to the national economy is relevant, since with the current organisation of different transport modes interaction, there are still high transaction costs. Aim: Study of influence of various modes of transport, including maglev transport, on the economy and economic growth. Methods: Theoretical and empirical. The paper considers the influence of various modes of transport, that operate in the cargo transport sphere, on the countrys economy. The comparison of existing modes of transport with the maglev transport from the point of view of desired effects is made. Results: The maglev transport possesses new properties and advantages, which makes it possible to view is as viable and able to provide a qualitative economic growth and resource-based economy if realised. Conclusion: The most efficient use of resources, the consumption of which should at least not increase and at most decrease, is achieved with the introduction of maglev transport into the transport system, as its economic properties already now excel those of the majority of other types of transport. It is obvious, as to the experts, that in transition to resource-based economy the maglev transport will be major transport for both cargo and passenger transit.
{"title":"Magnetic Levitation Cargo Ransport Role in World Economy","authors":"S. Smirnov, O. Smirnova","doi":"10.17816/transsyst201952106-117","DOIUrl":"https://doi.org/10.17816/transsyst201952106-117","url":null,"abstract":"Background: Currently, the car, water, railway, air and pipe transports are used for cargo and goods transportation. Each kind of cargo transport has its own specific competitive advantages that provide its most effective application at various stages of logistics chain. The economic efficiency of cargo transportation influences the overall economic efficiency, in particular, the gross domestic product. The quality of economic growth as applied to transport branch and its input to the national economy is relevant, since with the current organisation of different transport modes interaction, there are still high transaction costs. \u0000Aim: Study of influence of various modes of transport, including maglev transport, on the economy and economic growth. \u0000Methods: Theoretical and empirical. The paper considers the influence of various modes of transport, that operate in the cargo transport sphere, on the countrys economy. The comparison of existing modes of transport with the maglev transport from the point of view of desired effects is made. \u0000Results: The maglev transport possesses new properties and advantages, which makes it possible to view is as viable and able to provide a qualitative economic growth and resource-based economy if realised. \u0000Conclusion: The most efficient use of resources, the consumption of which should at least not increase and at most decrease, is achieved with the introduction of maglev transport into the transport system, as its economic properties already now excel those of the majority of other types of transport. It is obvious, as to the experts, that in transition to resource-based economy the maglev transport will be major transport for both cargo and passenger transit.","PeriodicalId":100849,"journal":{"name":"Journal of Transportation Systems Engineering and Information Technology","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89563709","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}
Pub Date : 2019-07-19DOI: 10.17816/transsyst201952118-129
I. V. Sokolova
Background: Development of Science in Russia is currently in urgent need of a thorough support from the state. Fundamental researches create ground for detalisation of innovative ideas and bring them closer through applied research to their developments and implementation. Ensuring sustainability of the countrys economy is possible only through contributing resources to researches of immediate relevance. Under existing conditions, special relevance is acquired by development of tools for assessment of additional effects of financing innovative development. Aim: The purpose of this study is to assess the impact on the national economy of the costs on innovative development of companies. Methods: Search for and analysis of: options of assessment of available information about results of scientific researches (both patented and those that are not officially registered as intellectual property); ways of deriving economic benefit from owning scientific researches results with absence of opportunity for their introduction into a companys activity or for selling. To assess the influence of expenses for innovative development on the national economy, the index of innovation support for the national economy (ISNE) is suggested to be used. Results: The algorithm for calculation of ISNE is presented. It is suggested to consider relevant for calculation those expenses of the companies, that work on development independently or with the help of national knowledge generation sector and higher education. These expenses are for: salaries, considering premium; procurement of national equipment and materials; paying for work carried out and services rendered by contracted companies. All other expenses at this stage are suggested to be deemed as irrelevant. The factor can be calculated for each company-resident, irrespective of type of activity and field of scientific researches for ID purposes. Conclusion: For companies that investing considerably in scientific and technical, innovative development, the increase of ISNE can be an additional incentive (with governmental support), will help in drawing attention to existing potential of the Russian science, save and multiply number of scientific schools, maintain high quality of scientific development and their effectiveness.
{"title":"On Assessment of Influence of Innovation Activities Results on the National Economy","authors":"I. V. Sokolova","doi":"10.17816/transsyst201952118-129","DOIUrl":"https://doi.org/10.17816/transsyst201952118-129","url":null,"abstract":"Background: Development of Science in Russia is currently in urgent need of a thorough support from the state. Fundamental researches create ground for detalisation of innovative ideas and bring them closer through applied research to their developments and implementation. Ensuring sustainability of the countrys economy is possible only through contributing resources to researches of immediate relevance. \u0000Under existing conditions, special relevance is acquired by development of tools for assessment of additional effects of financing innovative development. \u0000Aim: The purpose of this study is to assess the impact on the national economy of the costs on innovative development of companies. \u0000Methods: Search for and analysis of: \u0000 \u0000options of assessment of available information about results of scientific researches (both patented and those that are not officially registered as intellectual property); \u0000ways of deriving economic benefit from owning scientific researches results with absence of opportunity for their introduction into a companys activity or for selling. \u0000 \u0000To assess the influence of expenses for innovative development on the national economy, the index of innovation support for the national economy (ISNE) is suggested to be used. \u0000Results: The algorithm for calculation of ISNE is presented. It is suggested to consider relevant for calculation those expenses of the companies, that work on development independently or with the help of national knowledge generation sector and higher education. These expenses are for: \u0000 \u0000salaries, considering premium; \u0000procurement of national equipment and materials; \u0000paying for work carried out and services rendered by contracted companies. \u0000 \u0000All other expenses at this stage are suggested to be deemed as irrelevant. \u0000The factor can be calculated for each company-resident, irrespective of type of activity and field of scientific researches for ID purposes. \u0000Conclusion: For companies that investing considerably in scientific and technical, innovative development, the increase of ISNE can be an additional incentive (with governmental support), will help in drawing attention to existing potential of the Russian science, save and multiply number of scientific schools, maintain high quality of scientific development and their effectiveness.","PeriodicalId":100849,"journal":{"name":"Journal of Transportation Systems Engineering and Information Technology","volume":"108 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77918698","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}
Pub Date : 2019-07-19DOI: 10.17816/transsyst2019525-15
Konstantin K. Kim, A. Kolesova, S. Kolesov
Background: The vehicle moved in the pipe with rarefied air with the high speed provides high labour productivity, safety, ecological cleanness, comfort and independence from the atmospheric phenomena. Aim: improving the current collection in the speed range of 500-700 km/h. Method: We develop the method of decreasing the wear of the contact insert by using disulfide solid lubricant. Results: of the solution of magnetohydrodynamics equations for the lubricant layer allowed to define the optimal value of the lubricant layer thickness. Conclusion: The use of this lubricant is advisable on an alternating current. In this case the wear of the contact insert, the degree of sparking and the electromagnetic noise are decreased.
{"title":"Improve Current Collection in the Transport System of the Type \"HYPERLOOP\"","authors":"Konstantin K. Kim, A. Kolesova, S. Kolesov","doi":"10.17816/transsyst2019525-15","DOIUrl":"https://doi.org/10.17816/transsyst2019525-15","url":null,"abstract":"Background: The vehicle moved in the pipe with rarefied air with the high speed provides high labour productivity, safety, ecological cleanness, comfort and independence from the atmospheric phenomena. \u0000Aim: improving the current collection in the speed range of 500-700 km/h. \u0000Method: We develop the method of decreasing the wear of the contact insert by using disulfide solid lubricant. \u0000Results: of the solution of magnetohydrodynamics equations for the lubricant layer allowed to define the optimal value of the lubricant layer thickness. \u0000Conclusion: The use of this lubricant is advisable on an alternating current. In this case the wear of the contact insert, the degree of sparking and the electromagnetic noise are decreased.","PeriodicalId":100849,"journal":{"name":"Journal of Transportation Systems Engineering and Information Technology","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74467113","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}
Pub Date : 2019-07-19DOI: 10.17816/transsyst20195216-30
Weili Li, Junci Cao, Dong Li, Zhigang Wu
Background: Aiming at the problems of high local temperature and uneven temperature distribution in asynchronous traction motor of high-speed Electric Multiple Unit (EMU) when it is running. Aim: In this paper, the influence of ventilation system with different structure on temperature distribution is studied. Methods: Taking 600kW asynchronous traction motor as an example, the electromagnetic-fluid-temperature analysis model of the traction motor is established, and the temperature values of different positions in the motor are obtained. The accuracy of the calculation results is verified by comparing with the actual measurement. On this basis, by adjusting the structure of stator and rotor axial ventilation holes, the relationship between temperature distribution and fluid flow state in motor is studied. In addition, the influence of fluid incidence angle on fluid velocity and heat dissipation performance of motor is also studied, and the ventilation structure scheme with relative balance of axial and circumferential temperature in motor is found out, which provides a reference strategy for the design of temperature rise of motor with forced ventilation structure. Results: The wind speed near the intake side of stator teeth and rotor teeth groove is less than that far from the intake side. The flow distribution trend of rotor vent is similar to that of stator vent, but the air in the groove is affected by centrifugal force of rotor rotation, which makes the wind speed difference on the intake side larger than that on the outlet side. The stator winding and rotor guide bar are affected by wind temperature to reach the maximum temperature at the end of the outlet respectively. The stator core is higher at the windward side and the leeward side than the other parts of the motor. The heat dissipation effect at both ends is good. The highest temperature of the stator core appears near the leeward side.
{"title":"Study on Heat Exchange of Different Ventilation Structures of Asynchronous Traction Motor for High Speed EMU","authors":"Weili Li, Junci Cao, Dong Li, Zhigang Wu","doi":"10.17816/transsyst20195216-30","DOIUrl":"https://doi.org/10.17816/transsyst20195216-30","url":null,"abstract":"Background: Aiming at the problems of high local temperature and uneven temperature distribution in asynchronous traction motor of high-speed Electric Multiple Unit (EMU) when it is running. \u0000Aim: In this paper, the influence of ventilation system with different structure on temperature distribution is studied. \u0000Methods: Taking 600kW asynchronous traction motor as an example, the electromagnetic-fluid-temperature analysis model of the traction motor is established, and the temperature values of different positions in the motor are obtained. \u0000The accuracy of the calculation results is verified by comparing with the actual measurement. \u0000On this basis, by adjusting the structure of stator and rotor axial ventilation holes, the relationship between temperature distribution and fluid flow state in motor is studied. \u0000In addition, the influence of fluid incidence angle on fluid velocity and heat dissipation performance of motor is also studied, and the ventilation structure scheme with relative balance of axial and circumferential temperature in motor is found out, which provides a reference strategy for the design of temperature rise of motor with forced ventilation structure. \u0000Results: The wind speed near the intake side of stator teeth and rotor teeth groove is less than that far from the intake side. The flow distribution trend of rotor vent is similar to that of stator vent, but the air in the groove is affected by centrifugal force of rotor rotation, which makes the wind speed difference on the intake side larger than that on the outlet side. \u0000The stator winding and rotor guide bar are affected by wind temperature to reach the maximum temperature at the end of the outlet respectively. The stator core is higher at the windward side and the leeward side than the other parts of the motor. The heat dissipation effect at both ends is good. \u0000The highest temperature of the stator core appears near the leeward side.","PeriodicalId":100849,"journal":{"name":"Journal of Transportation Systems Engineering and Information Technology","volume":"112 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85487494","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}
Pub Date : 2019-07-19DOI: 10.17816/TRANSSYST20195231-46
V. Korzhov, Коржов Валерий Поликарпович, V. Zverev, Зверев Владимир Николаевич
Aim: Creation of multilayer superconducting tape made of Nb-Ti alloy. Methods: Using the methods of diffusion welding and packet rolling, for two cycles the prototypes of a multilayer tape based on a superconducting Nb50%Ti alloy were made. Copper was used as a stabiliser of the superconducting state of the conductor. At the initial stage, a multilayer Nb-Ti pack was assembled from niobium and titanium foils. Copper stabilising layers were laid in the pack in the 2nd cycle of tape manufacturing. The mutual diffusion between the Nb- and Ti-layers took place generally at the expense of niobium diffusing into the layers of titanium, with the Nb-50%Ti alloy emerging in their place. Results: Measurements of the critical current Ic with a perpendicular and parallel orientation of the magnetic field relative to the plane of the layers in the composite showed large anisotropy of Ic, which was the result of the superconducting vortices fixing exclusively at the boundaries of the Nb-Ti-alloy and the Nb-solid solution. In general, the composite was capable of carrying large current in magnetic fields of 5-6 T without long-lasting low-temperature annealing for -phase deposition, which is necessary in the case of Nb-Ti alloy composites produced by the known technology.
{"title":"A multilayer superconducting tape of the Nb50Ti alloy obtained from a Cu/Nb/Ti composite with a solid phase","authors":"V. Korzhov, Коржов Валерий Поликарпович, V. Zverev, Зверев Владимир Николаевич","doi":"10.17816/TRANSSYST20195231-46","DOIUrl":"https://doi.org/10.17816/TRANSSYST20195231-46","url":null,"abstract":"Aim: Creation of multilayer superconducting tape made of Nb-Ti alloy. \u0000Methods: Using the methods of diffusion welding and packet rolling, for two cycles the prototypes of a multilayer tape based on a superconducting Nb50%Ti alloy were made. Copper was used as a stabiliser of the superconducting state of the conductor. At the initial stage, a multilayer Nb-Ti pack was assembled from niobium and titanium foils. Copper stabilising layers were laid in the pack in the 2nd cycle of tape manufacturing. The mutual diffusion between the Nb- and Ti-layers took place generally at the expense of niobium diffusing into the layers of titanium, with the Nb-50%Ti alloy emerging in their place. \u0000Results: Measurements of the critical current Ic with a perpendicular and parallel orientation of the magnetic field relative to the plane of the layers in the composite showed large anisotropy of Ic, which was the result of the superconducting vortices fixing exclusively at the boundaries of the Nb-Ti-alloy and the Nb-solid solution. In general, the composite was capable of carrying large current in magnetic fields of 5-6 T without long-lasting low-temperature annealing for -phase deposition, which is necessary in the case of Nb-Ti alloy composites produced by the known technology.","PeriodicalId":100849,"journal":{"name":"Journal of Transportation Systems Engineering and Information Technology","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91131949","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}
Pub Date : 2019-07-19DOI: 10.17816/transsyst201952130-138
R. Kircher, Johannes Kluehspies, E. Fritz, R. Koehler
Background: The present situation in megacities is characterized by traffic congestion, capacity limits of public transportation systems. In addition, environmental regulations due to potential health risks will have an increasing impact on urban transportation systems. Aim: In this paper, we describe major technology trends in transportation and in information and communication systems which will influence urban transportation in future megacities. Based on these trends a vision of a sustainable urban transportation system is developed. Method: In a first step, trends in urban development and the individual needs are analyzed. Digitalization of transportation and communication technologies offer new business opportunities for Artificial Intelligence (AI) based services. Results: The intelligent combination of advanced transportation technologies in large buildings and AI based services enables a vision of Mobility on Demand, representing a flexible and sustainable urban transportation in future megacities. Conclusion: The vision Mobility on Demand illustrates the effective and flexible integration of individual transportation needs into public transportation systems. Depending on the standards of future individual vehicles such vehicles could be integrated seamlessly into the urban Maglev transportation system.
背景:目前特大城市的特点是交通拥堵，公共交通系统的容量有限。此外，由于潜在的健康风险，环境法规将对城市交通系统产生越来越大的影响。目的:在本文中，我们描述了交通和信息通信系统的主要技术趋势，这些趋势将影响未来特大城市的城市交通。基于这些趋势，我们提出了可持续城市交通系统的设想。方法:第一步，分析城市发展趋势和个人需求。交通和通信技术的数字化为基于人工智能(AI)的服务提供了新的商机。结果:大型建筑中的先进交通技术与基于人工智能的服务的智能结合，实现了按需移动的愿景，代表了未来超大城市中灵活和可持续的城市交通。结论:vision Mobility on Demand展示了个人交通需求与公共交通系统有效和灵活的结合。根据未来个人车辆的标准，这些车辆可以无缝地集成到城市磁悬浮交通系统中。
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Pub Date : 2019-07-19DOI: 10.17816/TRANSSYST20195292-105
V. A. Polyakov, N. Khachapuridze
Background: The synthesis of high-quality dynamics and its analysis are the cardinal tasks of a magnetically levitated trains (MLT) creating problem. Aims of the work: Design the paradigm and technique of specified tasks rational solution. Methods: The synthesis of the wanted motion is proposed to carry out by solving the systems dynamics inverse problem, and its preliminary analysis by solving the same dynamics direct problem. Results: The reasons for MLTs dynamics modeling are identified and substantiated. The paradigm and tensor technique of its computer synthesis and analysis was developed.
{"title":"Reasons for and Rational Methods of Magnetically Levitated Trains Dynamic Modelling","authors":"V. A. Polyakov, N. Khachapuridze","doi":"10.17816/TRANSSYST20195292-105","DOIUrl":"https://doi.org/10.17816/TRANSSYST20195292-105","url":null,"abstract":"Background: The synthesis of high-quality dynamics and its analysis are the cardinal tasks of a magnetically levitated trains (MLT) creating problem. \u0000Aims of the work: Design the paradigm and technique of specified tasks rational solution. \u0000Methods: The synthesis of the wanted motion is proposed to carry out by solving the systems dynamics inverse problem, and its preliminary analysis by solving the same dynamics direct problem. \u0000Results: The reasons for MLTs dynamics modeling are identified and substantiated. The paradigm and tensor technique of its computer synthesis and analysis was developed.","PeriodicalId":100849,"journal":{"name":"Journal of Transportation Systems Engineering and Information Technology","volume":"148 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-07-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86028510","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}
Pub Date : 2019-04-05DOI: 10.17816/TRANSSYST20195142-53
Vladimir M. Strepetov, K. Voevodskii
Aim: the probability of correctness of the collegial decision, which is made by a majority vote of some collective (board), consisting of an odd number of members is investigated, if the probability of correctness of the individual decision of each member of Board is known. Мaterials and methods: Bernoulli scheme, asymptotic representation, estimation via geometric series, power series expansion, the formula of Wallis, a power scale of averages, average of Kolmogorov. Result: it is established, that if for each member of the board the probability of correctness of the individual decision is more than ½, then with an unlimited increase in the number of members of the Board the probability of correctness of the collegial decision tends to 1. The asymptotic representation and a number of bilateral estimates characterizing the speed of this aspiration are obtained. For heterogeneous Board (that is a Board, whose members make the right individual decision with different probability) introduced the concept of collegial average as an average characteristics, which can replaced the individual probability of each member of the board with the preservation of the probability of a collegial decision. The existence and uniqueness of the collegial average are proved. We derive a collegial inequality showing that the collegial average of some a set of numbers is not less than the geometric average of the same numbers with the equality takes place in the case and only if all the numbers are equal to each other. The collegial inequality serves as an analogue and complement to known set of inequalities establishing a connection between different averages (for example, Cauchy inequality for arithmetic average and geometric average). Conclusion: thus, the results of the study fully meet the aim of determining the probability of correctness of collegial decision taken by a majority of votes under the assumptions. As a result we obtain an asymptotic representation and bilateral estimates characterizing the rate of striving for the correct solution. For a heterogeneous board, the existence uniqueness of the concept of collegial average as an average characteristics is introduced and strictly proved, which can be replaced by an individual probability of each with preserving the probability of correctness of the collegial decision. It is established that the collegial average is not less than the geometric average. Possible applications of the results obtained can be the quantitative evaluation of election procedures and the solution of problems associated with improving the reliability of recognition of weak signals of control sensors of various transport systems, including high-speed transport systems on magnetic suspension.
{"title":"The probability of the correct majority made decision","authors":"Vladimir M. Strepetov, K. Voevodskii","doi":"10.17816/TRANSSYST20195142-53","DOIUrl":"https://doi.org/10.17816/TRANSSYST20195142-53","url":null,"abstract":"Aim: the probability of correctness of the collegial decision, which is made by a majority vote of some collective (board), consisting of an odd number of members is investigated, if the probability of correctness of the individual decision of each member of Board is known. \u0000Мaterials and methods: Bernoulli scheme, asymptotic representation, estimation via geometric series, power series expansion, the formula of Wallis, a power scale of averages, average of Kolmogorov. \u0000Result: it is established, that if for each member of the board the probability of correctness of the individual decision is more than ½, then with an unlimited increase in the number of members of the Board the probability of correctness of the collegial decision tends to 1. The asymptotic representation and a number of bilateral estimates characterizing the speed of this aspiration are obtained. For heterogeneous Board (that is a Board, whose members make the right individual decision with different probability) introduced the concept of collegial average as an average characteristics, which can replaced the individual probability of each member of the board with the preservation of the probability of a collegial decision. The existence and uniqueness of the collegial average are proved. \u0000We derive a collegial inequality showing that the collegial average of some a set of numbers is not less than the geometric average of the same numbers with the equality takes place in the case and only if all the numbers are equal to each other. The collegial inequality serves as an analogue and complement to known set of inequalities establishing a connection between different averages (for example, Cauchy inequality for arithmetic average and geometric average). \u0000Conclusion: thus, the results of the study fully meet the aim of determining the probability of correctness of collegial decision taken by a majority of votes under the assumptions. As a result we obtain an asymptotic representation and bilateral estimates characterizing the rate of striving for the correct solution. For a heterogeneous board, the existence uniqueness of the concept of collegial average as an average characteristics is introduced and strictly proved, which can be replaced by an individual probability of each with preserving the probability of correctness of the collegial decision. It is established that the collegial average is not less than the geometric average. Possible applications of the results obtained can be the quantitative evaluation of election procedures and the solution of problems associated with improving the reliability of recognition of weak signals of control sensors of various transport systems, including high-speed transport systems on magnetic suspension.","PeriodicalId":100849,"journal":{"name":"Journal of Transportation Systems Engineering and Information Technology","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87568780","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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