168 research outputs found

    Algorithm, mathematical models and analysis of axle counting systems

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    The article discusses one of the sensors that is widely used to determine the location of a train with an axle counting system, namely the axle counter, since various types of sensors, such as track circuits, eurobalises, etc., are widely used in railway automation at stages and stations. The study consists in identifying the failure of the railway car counting axle under the influence of disturbing factors, namely the influence of weather conditions, terrain, the influence of rail magnetization, which leads to a malfunction of the axle counting system. The research method was to determine the failure in the calculation of the axles of the train, when, for unknown reasons, false information was shown, it turned out that when switching from diesel traction to electric rail, it is a grounding circuit, and the electrochemical effect also manifests itself, which leads to the accumulation of electrical energy. The research method consists in determining these factors; for this, algorithmic expressions were developed and the principle of operation of the axle counter was investigated. As a result, it was found that with electric traction, rail magnetization and magnetization between rail tracks, an accumulator effect, occur. The influence of the disturbing factor is calculated and shown by the distance to the sensitive element of the control sensor, the magnitude of the electromagnetic field intensity modulus, which affects the operation of the axle count sensor. In conclusion, protection methods based on adaptive protection methods are proposed

    Determination of the optimal parameters of the control sensor at the crossing in the control mode

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    On railway sections where there are intersections with road transport, control systems for crossing signaling with auto barriers are arranged. To control the entrance of the train to this section, track circuits with insulating joints are used. Such circuits have a number of significant drawbacks, one of which is the coming off of insulating joints, as well as breakage of the track circuit, which give 45% of the failures of automation systems on the haul. In this article, a study was made of a crossing track circuit with a tone frequency for the control mode. For the study, mathematical expressions for determining the most unfavorable moment were derived, an algorithmic expression for the control mode coefficient was presented, which gives more accurate information about the presence of damage. As a result, a block diagram was developed and graphs were displayed on the simulation model showing the influence and determination of the control mode of operation of the jointless tone track circuit. In conclusion, the results of the study are summarized

    Algorithm and software tools for optimizing the preparation of routes on high-speed lines based on RFID technology

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    On railways of the Republic of Uzbekistan, on hauls "Dashtabad - Zarbdar" and "Dashtabad - Bayaut" on section Tashkent - Samarkand and Navoi - Bukhara - 1, on section Samarkand – Bukhara organized high-speed train traffic, where hauls with a SAB microprocessor system were modernized on basis of axle counting system, produced by "Promelectronica". For the preparation of routes when departing or receiving at station, especially on high-speed sections, preparation is carried out with a large investment of time, which, in turn, interrupts the technological work carried out at the station. Offered with microprocessor semi-automatic lock on the axle counts, apply for establish routes RFID points, because maintenance and economic component are minimal. Accordingly, after examining the points and deriving analytical equations, algorithms and software tools were proposed. Key words: high-speed line, high-speed traffic, train, station, stage, mixed traffic, microprocessor-based semi-automatic blocking

    Discutindo a educação ambiental no cotidiano escolar: desenvolvimento de projetos na escola formação inicial e continuada de professores

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    A presente pesquisa buscou discutir como a Educação Ambiental (EA) vem sendo trabalhada, no Ensino Fundamental e como os docentes desta escola compreendem e vem inserindo a EA no cotidiano escolar., em uma escola estadual do município de Tangará da Serra/MT, Brasil. Para tanto, realizou-se entrevistas com os professores que fazem parte de um projeto interdisciplinar de EA na escola pesquisada. Verificou-se que o projeto da escola não vem conseguindo alcançar os objetivos propostos por: desconhecimento do mesmo, pelos professores; formação deficiente dos professores, não entendimento da EA como processo de ensino-aprendizagem, falta de recursos didáticos, planejamento inadequado das atividades. A partir dessa constatação, procurou-se debater a impossibilidade de tratar do tema fora do trabalho interdisciplinar, bem como, e principalmente, a importância de um estudo mais aprofundado de EA, vinculando teoria e prática, tanto na formação docente, como em projetos escolares, a fim de fugir do tradicional vínculo “EA e ecologia, lixo e horta”.Facultad de Humanidades y Ciencias de la Educació

    stairs and fire

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    Algorithm and software tools for optimizing the preparation of routes on high-speed lines based on RFID technology

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    On railways of the Republic of Uzbekistan, on hauls "Dashtabad - Zarbdar" and "Dashtabad - Bayaut" on section Tashkent - Samarkand and Navoi - Bukhara - 1, on section Samarkand – Bukhara organized high-speed train traffic, where hauls with a SAB microprocessor system were modernized on basis of axle counting system, produced by "Promelectronica". For the preparation of routes when departing or receiving at station, especially on high-speed sections, preparation is carried out with a large investment of time, which, in turn, interrupts the technological work carried out at the station. Offered with microprocessor semi-automatic lock on the axle counts, apply for establish routes RFID points, because maintenance and economic component are minimal. Accordingly, after examining the points and deriving analytical equations, algorithms and software tools were proposed. Key words: high-speed line, high-speed traffic, train, station, stage, mixed traffic, microprocessor-based semi-automatic blocking

    Algorithm, mathematical models and analysis of axle counting systems

    No full text
    The article discusses one of the sensors that is widely used to determine the location of a train with an axle counting system, namely the axle counter, since various types of sensors, such as track circuits, eurobalises, etc., are widely used in railway automation at stages and stations. The study consists in identifying the failure of the railway car counting axle under the influence of disturbing factors, namely the influence of weather conditions, terrain, the influence of rail magnetization, which leads to a malfunction of the axle counting system. The research method was to determine the failure in the calculation of the axles of the train, when, for unknown reasons, false information was shown, it turned out that when switching from diesel traction to electric rail, it is a grounding circuit, and the electrochemical effect also manifests itself, which leads to the accumulation of electrical energy. The research method consists in determining these factors; for this, algorithmic expressions were developed and the principle of operation of the axle counter was investigated. As a result, it was found that with electric traction, rail magnetization and magnetization between rail tracks, an accumulator effect, occur. The influence of the disturbing factor is calculated and shown by the distance to the sensitive element of the control sensor, the magnitude of the electromagnetic field intensity modulus, which affects the operation of the axle count sensor. In conclusion, protection methods based on adaptive protection methods are proposed

    Four-Pole Rail Coefficients Of The Jointless Track Circuit In The Presence Of One Of The Ends Track Circuit Insulating Joints

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    The article describes the equivalent circuit of a jointless rail circuit with one throttle transformer and derives equations for the analysis and synthesis of rail circuits when powered on one side. A mathematical model and analytical expressions are developed taking into account the resistance of the rails and the resistance of the insulation. The coefficients of a rail four-poul with one throttle transformer supply voltage on the one hand. The calculated expressions of the four-terminal devices and the sensitivity criteria of the rail circuit when a single line breaks, as well as the minimum transmission resistance, are presented and derived

    Catalogue of wood plants of the Mountain Botanical Garden

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    The unique scientific installation "System of experimental bases of the Mountain Botanical Garden of the Dagestan Scientific Center of the Russian Academy of Sciences" includes two experimental bases (EB): Gunib EB - 30 ha in area, located at the Gunib plateau (1600 - 1950 m above sea level), Tsudakhar EB - 10 ha in area, located 2 km away from the village of Tsudakhar (1100-1250 m above sea level). Collections of the experimental bases include woody plants from the Northern Hemisphere, including resource, rare and endemic flora of the North Caucasus and Dagestan. The catalogue has been compiled on basis of the plant lists prepared by the supervisors of the Mountain Botanical Garden Laboratory of Woody Plants Introduction and Genetic Resources. Currently, the collection of the Mountain Botanical Garden includes 1260 taxa of woody plants: 439 species, 19 subspecies, 239 population forms and 559 varieties, 139 genera, representing 58 families. The following genera are the most widespread, according to their type and species variety: Malus (167 taxa), Pyrus (78), Armeniaca (65), Sorbus (59), Lonicera (53), Cerasus (46), Rosa (43), Juniperus (43), Rubus (41), Acer (37), Ribes (33). The collection includes 22 species of woody plants included in the Red Books of Russia and Dagestan
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