Search

In article discusses models of unlimited track circuits with a receiver, adapting to different working conditions, applied double receiver with one power supply in the middle, which allows you to extend the length of the continuous rail circuit. For this, a goal is set, in which is the development of models of jointless track circuits with an adaptive receiver, in which the rail line must take into account the total stress distribution along the rail line and disturbing factors. The article presents the equivalent circuits of continuous welded rail circuits with an adaptive receiver, algorithmic expressions for determining currents and voltages at the ends of the rail circuit, the coefficients of rail lines with an adaptive receiver are developed, calculation algorithms are presented. In conclusion, a graph is given, according to which it is shown that a continuous rail circuit with an adaptive receiver can operate with an insulation resistance three times lower than the threshold value in any modes of the rail circuit, taking into account the fact that, minimum allowable insulation resistance for tone-on-tone continuous rail circuits is taken as Ri=0,7ohm*km. Derived for the theory and synthesis of solutions, and also proposed new approaches to ensure the operating modes of the rail circuit, taking into account the real and weather conditions of operation.

See the retraction notice E3S Web of Conferences 549, 00001 (2024), https://doi.org/10.1051/e3sconf/202454900001

See the retraction notice E3S Web of Conferences 549, 00001 (2024), https://doi.org/10.1051/e3sconf/202454900001

The normal operating state of jointless and butt track circuits depends on the state of change in the insulation resistance; respectively, the correct choice of the maximum and minimum limit resistance characteristics should be considered. The maximum and minimum limit resistance depends on the power consumption of the unlimited track circuit in the normal and the mode of movement of the wheelset at the supply end of the rail line. The article presents a study of an intelligent track circuit without insulated joints, where logical elements replace all the equipment of mechanical and electrical energy converters. The research aims to determine the shunt that affects the definition of the movable block, respectively, the definition of the power of the shunt. The method consists in choosing a sensor, namely an intelligent track control sensor, and developing a mathematical model for determining the shunt power, which provides the influence of the shunt on the track circuit. Research carried out for track circuits with insulating joints has shown that with the value of the argument, modulus, and synthesis of the maximum-minimum limit resistance when the supply end is shunted, the maximum power will be the least minimum Rkmax. Because of the lack of more accurate data for an intelligent control sensor, studies were carried out.

While Wi-Fi 5 is still sufficient for many organizations and businesses, it is important to consider and upgrade to Wi-Fi 6. This article discusses the main differences between Wi-Fi 5 and Wi-Fi 6. The goal is to identify key metrics transmission of information content of signals, a method for determining the best use of Wi-Fi signals for certain categories of use, an analysis and study of the influence of frequencies on the quality of transmitted information, and also analyzes the growth rate of an organization using these technologies. Using the Orthogonal Frequency Division Multiple Access connection principle, Wi-Fi 6 technology provides the main advantage of performing multiple receptions and transmissions at the same time. Multiple User Multiple Input Multiple Output technology allows routers to communicate with all devices at the same time, resulting in maximum packet exchange. Using the Basic Service Set (BSS) color scheme, we can see that Wi-Fi 6 is far ahead of previous technologies.

The article analyzes the operation of relative track circuits, which shows that they are able to provide reliable control of the state of the rail line in extreme climatic conditions. Reliable operation of relative track circuits can be carried out at very low values of insulation resistance, down to 0.1 Ohm km and below. The method of monitoring the state of the rail line, based on fixing the voltage of the receiving end before the train approaches and then determining the threshold values, significantly expands the range of changes in the insulation resistance, in which the normal operation of the track circuit is possible. The goal is to represent the track circuit, where the theory of the rail line is used according to the standard of the track circuit operating modes, at present many factors have not been taken into account for high-speed traffic, one of these is the transmission resistance with insulation resistance, the influence of disturbing and other factors. Mathematical modeling has been developed to determine the insulation resistance in various weather conditions.

See the retraction notice E3S Web of Conferences 420, 00001 (2023), https://doi.org/10.1051/e3sconf/202342000001

See the retraction notice E3S Web of Conferences 420, 00001 (2023), https://doi.org/10.1051/e3sconf/202342000001

See the retraction notice E3S Web of Conferences 420, 00001 (2023), https://doi.org/10.1051/e3sconf/202342000001

The design of the suspension unit of the flame tube in the housing of the annular combustion chamber of a ground-based gas turbine installation of a gas pumping unit is given for placing it in a device for fixing the flame tube in the combustion chamber housing, where automatic clearance selection is required arising between the contacting surfaces of the docking nodes of the combustion chamber and the nozzle apparatus of the turbine, when the combustion chamber is operating as part of the engine. The proposed design of the suspension unit of the flame tube in the annular combustion chamber housing makes it possible to increase the reliability and resource of the combustion chamber and, in general, the entire ground-based gas turbine installation by eliminating the jamming of the split rings in the cups of the suspension units and the misalignment of the pushers relative to the suspension units and split support rings.

The method is based on the analysis of the stress-strain state of the free (power) turbine (FT) disk and its change during long-term operation in accordance with the characteristics of the operation of a ground-based gas turbine engines (GTE) for gas pumping aggregate (GPA). In addition, the paper examines statistical data on the mechanical characteristics and durability of the material disk of a FT — a heat-resistant nickel-based alloy EI698-VD. It takes into account the change in the characteristics of the material during the long-term operation of the ground-based GTE for GPA. The durability of the FT disk is predicted based on changes in statistical strength reserves during operation. The object of the study is the FT disk of the NK-16ST, which is currently widely used and has an established assigned resource of 150,000 hours.

Various principles can be used to implement intelligent track circuits: voltage regulation of the power supply, compensation methods for switching on rail lines and track circuit devices, receiver sensitivity adjustment, comparison of two electrical parameters of one, two, or more track circuits, as well as a combination of these methods. At present, such improvement of track circuits is becoming relevant, which would make it possible to exclude from the circuits one of the most unreliable elements - an insulating joint, use a modern microprocessor element base in devices for monitoring the state of track sections, thus ensure their reliable operation. This will significantly reduce the costs of building and operating interval control systems and increase train traffic safety. These requirements are met by intelligent track circuits, which consider the current value of the insulation resistance, the rate of change of this resistance, and the longitudinal asymmetry.