Vol 7, No 4 (2021)
Scientific and practical development
Force control in girder-cable systems
Abstract
The object of the study is the forces in the beam-cable systems. The introduction of these systems in construction is associated with the task of creating a pre-stress in order to regulate the stress-strain state of the beam-cable system as a whole. Prestressing will make it possible to rationally use high-strength materials in the structure, and to design the structure economically. When designing girder-cable-stayed structures of bridge spans, it is necessary to determine the sequence of stresses of the structural elements-shrouds in order to regulate the forces in the beam element of the structure. This problem is considered in this article. The dynamic programming method is used to regulate the stress-strain state of the system by pulling the shrouds in the optimal sequence. To solve the problems, formulas for the output value and the optimality criterion, as well as the matrix, are given. As a result, the values of the output values of interest at all stages of the tension of the shrouds are found.
5-13
Bench testing of hybrid ems prototype
Abstract
Aim: To test the levitation performance of a hybrid EMS prototype.
Materials and Methods: a levitation test setup with a 18 mm thick steel rail was constructed on a basis of the certified test bench 1958U-10-1 for measurement in the range up to 100 kN. The attractive force was investigated by varying the air gap size and coil current. Measured data were compared with parametric simulations.
Results: Experimental and numerical results agreed with the accuracy required for practical application.
Conclusions: A prototype of hybrid EMS (HEMS) for maglev transport has been designed, built, and tested at JSC “NIIEFA”. The HEMS concept has an advantage of reduced power loss and low stray field. The bench testing has proved good levitation performance and low power consumption of the proposed design. The measured data were used to check design solutions and verify 3D numerical models of the magnets. The comparison demonstrated a good match between measurements and simulations.
14-32
Analysis of the possibility of using solar energy for the energy supply of the innovative ELTRO transport system for Myanmar
Abstract
Background: The development and research of the applicability of various mathematical models for calculating the solar radiation of companies is an urgent task for the innovative transport system of Myanmar.
Aim: Determination of the daily balance of energy generated by solar panels to perform a given operation of the transport system.
Materials and methods: Mathematical, algorithmic and software (based on the Python language) have been developed for energy supply and creation of interactive geo-information models for the ELTRO transport system.
Results: To estimate solar resources at a point with coordinates (φ = 19.76° s. w.; ψ = 96.07° w. d.), data from the databases "NASA", "Meteonorm" and the Myanmar GMS were used and compared with the actual data on the Myanmar GMS database in order to determine the reliability of the information presented in them.
Conclusion: The results obtained made it possible to determine the structure of the solar energy supply system and the parameters of typical solar energy modules that provide energy supply not only to the transport system, but also to the adjacent territories.
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Transport systems load-bearing structures state diagnistics and monitoring
Abstract
Aim: To provide the study and control of the stress-strain state of load-bearing structures during the operation of magnetolevitation transport systems.
Methods: Experimental and theoretical studies of dynamic parameters.
Results: To assess the stress-strain state of the main load-bearing structures of magnetolevitation transport systems using string superstructure it is proposed to measure the natural vibration frequencies.
Conclusion: The organization of diagnostics or monitoring of changes in the natural vibration frequencies of load-bearing structures ensures the operational reliability of load-bearing structures for Maglev.
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Transport economy
Tariff policy offers on the line of magnetic levitation transport
Abstract
Background: The transport interchange hub meets its fundamental function - the concentration and organization of traffic flows of various types of transport, including individual and passenger transfers, and is of a utilitarian nature. One of the possible solutions is to place not just transfer complexes, but multi-storey structures of this kind. Where the first floor is a distribution pedestrian level, the main task of which is to ensure the transfer of passengers in a comfortable environment. On the next level there are objects of passing passenger service, the three upper floors are "intercepting" parking. With the urban area adjacent to the node, communications are provided through underground pedestrian crossings.
Aim: The commissioning of maglev transport lines in places of concentration of growing passenger traffic, which will help to reduce travel time, meet freight needs, improve the quality and increase travel safety when driving on dedicated lanes. At the same time, it is necessary to integrate maglev transport into the transport system of cities.
Method: The article defines the goals and objectives of the placement of transport interchange complexes. The article presents a methodology for assessing the location of transport hubs, which consists of three stages.
Results: At the first stage, in accordance with the proposed methodology, it is necessary to carry out an integrated assessment of the territories under consideration in order to determine the prospects for their development. At the second stage, it is necessary to analyze the existing transport infrastructure in the region, providing passenger traffic in order to identify areas with the greatest transport accessibility, both in the current period and in the future. At the third stage, on the basis of logistic criteria, the analysis of the transport network in the areas with the highest passenger flows is carried out.
52-64
Trends for sustainable development of ecomobility transportation systems
Abstract
Background: Nowadays, the transport industry faces unconventional challenges such as the need to modify the transport service and reduce dependence on resource leverage. At the same time, it is necessary to take into account the decline in business activity associated with the pandemic crisis and, as a result, the drop in demand and prices for hydrocarbon fuel in the medium term until the end of the crisis. Also, the implementation of a forward-looking transport policy has a close relationship with the economic category of time, since the value of time, converted into speed, shifts the emphasis of value from the initial price of the purchased transport service to the total cost of owning it. The railway transport system of the Russian Federation, as one of the leaders of the world transport system, has every opportunity to actively participate in global restructuring in response to the global climate and environmental crises.
Aim: Determination of the relationship between the adoption of a sustainable development policy and the effectiveness of the implementation of projects for the development of backbone infrastructure in Russia. We confirm that the activities of transport companies within the framework of the established sustainable development goals (hereinafter referred to as ESG – Environmental, Social, and Corporate Governance) contributes to the improvement of their operational activity.
Methods: The research methodology is based on the analysis of international approaches and assessment criteria for ESG factors using analytical procedures to identify cause-and-effect relationships of the strategy for the development of railway transport in the Russian Federation within the framework of ESG. The information base of the study is based on an analysis of reports from international organizations and data from JSC “Russian Railways” in terms of funding, expected prospects and effects.
Results: as a result of the study, the conditions for the transformation of the sustainable development of railway transport systems in the world and in the Russian Federation were determined against the background of changes in the geography and structure of commodity markets, favorable prospects were established from the direct participation of business in the implementation and implementation of the goals and objectives of sustainable development.
Conclusion: on the basis of the study, an assessment was made of the benchmarks of JSC “Russian Railways” in the sustainable development strategy. In order to implement environmental infrastructure projects, the parameters of the compliance of the strategy for the development of railway transport in Russia with the goals of sustainable growth have been established.
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Structural and logical model of transport cluster
Abstract
Background: Transport clustering, being a cooperation of enterprises of the same territory to consolidate resources to improve the quality of transport and logistics services, to improve the quality of infrastructure, to ensure the growth of transport accessibility of the territory, is one of the drivers of economic growth of the territory. Therefore, the question of forming a mechanism for creating a transport cluster (TС) is relevant, the first stage of which is the TLC model.
Aim: creation of a structural and logical model of a transport and logistics cluster, the implementation of which will allow the creation of a TC in any territory with a high transport and transit potential.
Methods: Based on the research, generalization and analysis of the works of domestic and foreign researchers in the field of transport clustering and regulations, laws and strategic documents, the definitions of the concepts of the components of the TLC were clarified, the main and auxiliary participants of the cluster were identified, their functional relationships were identified, the requirements for the infrastructure of the TC were determined, the effect of the activity of the TC for the participants and for the territory on which the cluster is located was revealed.
Results: The result of the study is a structural and logical model of the transport cluster.
Conclusions: The obtained structural and logical model of the transport cluster allows the development of transport clustering in the Russian Federation, since it is a universal tool for creating a TC for any territory with a high transport and transit potential
76-89
Advancing the development of railway transport with the help of digital technologies
Abstract
Background: The object of the study is regional and global cargo transportation. In order for cargo transportation to link the national economy into a single whole, and also allow it to realize its export opportunities, the level of organization of railway transport should be significantly higher than that of other market participants (primarily shippers and consignees).
Aim: to study the prospects for increasing the role of railway transport with the help of digital technologies.
Methods: To model the role of railway transport at the national and global levels, the article uses the concept of general organizational science by A. A. Bogdanov (Tectology). The Theory of Inventive Problem Solving (TRIZ) is used to model the role of railway transport at the micro level.
Results: Railway transport is considered as a system consisting of subsystems: "working body", "transmission", "engine" and "computer". Each of these subsystems corresponds to separate divisions of railway transport. Digitalization involves the transfer from a person to automated systems, first of all, the functions of such a subsystem as a "working body", which functions according to the same algorithm and, therefore, is extremely routine. This simplifies and makes more predictable the production activities of the relevant departments of railway transport, which in turn creates the opportunity to increase the complexity of other subsystems.
Conclusion: Railway transport was originally created as a complex macro system based on the most advanced technologies and significantly ahead of other industries in its development. Because of this, he was able to dramatically increase the level of complexity of the territories that he reached. However, today railway transport is experiencing increasing competition from other modes of transport, and therefore qualitatively new measures are required from railway transport to ensure advanced development. To do this, it is proposed to apply digitalization to the process of physical movement of goods as a whole: from fixing the need for transportation from shippers to delivering goods directly to the production sites of consignees. In this case, the main competitive advantage of railway transport becomes the "computer".
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