bluuebunny/crossref_metadata_2025_split huggingface dataset:
Control algorithm for decision making in multi-criteria optimization problems
Authors: Grishko A K 
Published: December 2022

Abstract
The main feature of the multi-criteria optimization of the design processes of complex electronic devices is that they are all interconnected, heterogeneous in nature and, as a rule, non-linear. That is, by changing some of them by varying the corresponding parameters, we inevitably change other parameters of the system, and not always in the right direction. The purpose of the work is to propose a way to organize the procedure for finding the optimal solution to multicriteria design problems. When developing and creating new schemes, structures and systems, the task of determining the optimal values of the parameters of the designed technical device or system is reduced to the task of finding the extremum of a certain function, called the quality function. Usually, it is a non-linear function of many independent variables, which, as a rule, cannot be investigated by analytical methods. In this situation, it is advisable to search for a solution to the problem using special algorithms. At the early stages of designing complex radio electronic devices, an algorithm for finding the optimal solution based on the application of search optimization theory methods is proposed. The paper describes the procedure for finding the optimal solution, the distinctive feature of which is that during the search for a solution, information is accumulated and a search direction vector is constructed. This vector offers options for changing weights for subsequent search procedures. The algorithm developed on its basis is used in the information system for the complex analysis of the designs of radio-electronic facilities. The use of random search provides the algorithm with global properties, reduces the number of objective function calculations by one step, which is especially noticeable with a large number of optimized parameters. Allows you to quite simply include any restrictions on the set of valid values of the vector of optimized parameters, which is not always possible when using regular search methods. The proposed algorithm is simply tuned to search for a global extremum by selecting the appropriate parameters. For each specific case, there are some optimal ratios of the values of these algorithm parameters, which, when searching for a solution, reduce the number of working steps. The developed algorithm is less critical to the optimal values of its own parameters, which makes it much easier to tune it when solving practical problems of optimizing design processes.
Single channel queuing system utilization factor model
Authors: Zyulkov Alexander , Kutoyants Yury , Perelevskiy Svyatoslav , Korableva Larisa 
Published: December 2022

Abstract
Under the assumption of a low intensity of the flow of incoming requests and a high speed of their service, the M|M|1 system utilization factor model is considered. It is estimated for a small part of the observation time. Approximate relations are obtained for the system utilization factor. Its simple probabilistic model in the form of a probabilistic mixture is proposed. A comparison with the results of simulation is carried out.
Modified discrete phase numerical model for calculating ultrasonic coagulation in Eckart flows
Authors: Shalunov A V , Golykh R N , Khmelev V N , Nesterov V A 
Published: December 2022

Abstract
One of the most effective methods for trapping aerosol particles is the preliminary combination of particles into agglomerates under the action of high-intensity sinusoidal ultrasonic (US) oscillations (ultrasonic agglomeration) for further trapping of coarse particles by traditional methods (inertial or gravitational settling, filtration through a porous material, etc.). To date, the effectiveness of ultrasonic agglomeration has been repeatedly proven for particles larger than 2.5 μm. However, ultrasonic agglomeration, based on the known mechanisms of particle interaction, is not very effective when exposed to particles smaller than 2.5 μm and especially less than 1 μm. At the same time, the possibilities of a linear acoustic field are well studied today and it has been established that exposure to a linear acoustic field does not provide effective coagulation of PM2.5 particles. And with an increase in the sound pressure level of a linear acoustic field, coagulated particles (especially when it comes to solid particles) begin to break down. Therefore, the authors proposed to use nonlinear effects, which consist in the formation of vortex acoustic (Eckart) flows that can cause a local increase in the concentration of particles and, consequently, an increase in the efficiency of coagulation. It has been established that the formation of vortex acoustic sweats in the resonant gap can additionally increase the efficiency of ultrasonic coagulation by at least 1.5 times.
Investigation of the possibilities of surface hardening of heavily loaded metal elements made of carbon steels for various purposes
Authors: Moldahmetova A E , Sarsembaeva T E , Vasil’ev I M , Zagidullin R R , Sabitov L S , Nurullin A F , Novikov S V 
Published: December 2022

Abstract
The interaction of the wheel and the rail, being the physical basis for the movement of trains, determines not only such important technical and economic indicators of railway transport as the weight of trains and their speed, the reliability and operational life of wheel sets, but also the basis of the foundations of railway operation - the safety of train traffic. Therefore, studies of the problems of interaction of the wheel-rail friction pair are relevant and in demand not only within the framework of a particular wagon or locomotive depot, but also in the country’s railway transport as a whole. In this regard, it is important to note that one of the main and most loaded elements of the undercarriage of locomotives and wagons that directly interact with the rails are railway wheels. An important factor in the development and implementation of new surface hardening technologies is: firstly, rising prices and corresponding costs for the production of metal products for wheels with high energy consumption, secondly, increasing costs for spare parts, maintenance and overhaul of wheel sets; thirdly, the rise in prices for energy carriers and transportation costs for their delivery; traditional heat treatment is almost impossible to achieve.
Investigation of mechanical processing during milling
Authors: Khamroev Khamza , Savriev Yuldosh , Buronov Sunatullo , Turaeva Umida 
Published: December 2022

Abstract
The development of the engineering industry is determined by the efficiency of the technological processes used in it. In a market economy, improving the quality of products and reducing their costs increase commodity competitiveness and lead to further development of production. The quality and cost of the product produced, the simplicity of its design, labor productivity. On the basis of vibration diagnostics, it was found that the average signal amplitude decreased with increasing force and rigidity as the center of the workpiece was approached, as well as a decrease in the vibration frequency, which had a positive effect on the quality of processing and reduced tool wear.
Metallographic properties evaluation of the specimens obtained by the vibratory method (cast iron ISO 400-12)
Authors: Ojeda Pardo F R , Sánchez Figueredo R P , Belette Fuentes O , Quiroz Cabascango V E , Mosquera Urbano A P 
Published: December 2022

Abstract
The objective of this research is to evaluate the metallographic properties to obtain cast iron with nodular spherical graphite ISO 400-12 by “In mold” modification using the vibratory method. To carry out the experiments, a model was prepared to reproduce the specimens used, according to the ASTM A0536-84R04 standard for the certification of the quality of cast iron with spherical nodular graphite. The pouring temperature levels were adapted to the wall thickness of the specimens. Vibration frequency (65 Hz, 70 Hz, 75 Hz), pouring temperature (1450°C and 1425°C) and mass of nodulizing alloy FeSiMg (NODULAN II) (189.98 g; 170.99 g; 151.99 g), calculated by the traditional method, were set as independent variables. The applied vibratory method caused changes in the morphology of the metal, as high spheroidization was obtained for all levels of modified alloy mass and smaller nodules (from 40 μm to 60 μm in diameter) were achieved. The tensile strength and relative elongation of the specimens obtained by the vibratory method were similar to the international standards for this type of casting and higher than the castings with nodular spherical graphite obtained under static conditions. Finally, the standard specimens (static method) and the specimens obtained by the vibratory method were obtained, and the metallographic and mechanical properties tests established by the international standards were carried out.
Thermal insulation of engineering structures with mineral wool based on basalt fiber
Authors: Koroli M A , Ivanisova A R 
Published: December 2022

Abstract
The most vulnerable link of central heating systems are heat pipelines. Steam and condensate pipelines devoid of thermal insulation are a constant source of heat loss, which can be easily eliminated. In most cases, the thermal insulation of all heated surfaces does not present significant difficulties. There may be situations when the insulation was removed during maintenance or repair and not restored at the end of the work. Removable thermal insulation elements of valves and other devices may also be missing. To ensure the economic efficiency and reliability of heat supply, it is necessary to intensively modernize heating networks. The most effective way to increase the energy efficiency of engineering structures is the use of modern structural solutions using thermal insulation materials. In addition, it allows you to reduce operating costs, that is, to achieve significant savings in fuel resources. The economical efficiency of district heating systems at the current scale of heat consumption largely depends on the thermal insulation of equipment and pipelines. The struggle to reduce transport heat losses in pipelines is the most important means of saving fuel resources. The paper considers the possibility of improving the energy efficiency of engineering structures through the use of modern structural solutions using thermal insulation materials based on basalt fiber.
Technological equipment for foundry production, efficiency and safety
Authors: Kinev E S , Tyapin A A , Panteleev V I , Pervukhin M V , Bezrukikh A I 
Published: December 2022

Abstract
The article discusses the results of the development and research of controlled electrical preheating of casting troughs and intermediate tanks in the system of transport trays for pouring aluminum melt. Electric heating contributes to high-quality and safe pouring of the melt in the cold shop. The heating of the casting track links eliminates the possibility of an explosion when the melt contacts water or ice, and also maintains the fluidity of the metal and limits the temperature gradient in the melt. Evaluation of the efficiency of the heater system was carried out on the basis of mathematical modeling of thermohydrodynamic processes in the melt. Acceptable characteristics of the section of the trays were determined to improve the distribution of metal by the melting and casting complex. To ensure the electrical safety of the equipment, it is proposed to power the heaters at a reduced voltage. Changing the intensity of heating is implemented by switching the windings of a group of power transformers from a delta connection to a star connection. Preheating controls are built in the form of a relay-contactor subsystem integrated into the microcontroller control system of the foundry complex.
Monitoring of the residual life of galvanic batteries
Authors: Emets S V , Krasnov A N , Yu V Kalashnik , Prakhova M Yu 
Published: December 2022

Abstract
The development of distributed automation systems built on the use of wireless communication channels has led to an increase in the role of autonomous power systems. These systems use so-called CCS - chemical current sources, both rechargeable (accumulators) and non-rechargeable (batteries, or galvanic batteries). Depending on the purpose and operating conditions, the battery life of the same type may be different, and for some automation systems, knowing its current value is critical. An example of such a system is an automated telemetry system for drilling oil and gas wells, in which its constituent modules are powered from an autonomous source based on lithium-thionyl chloride cells. A feature of the system is the presence of several modes of operation, which differ significantly from each other in duration and energy consumption. The article proposes an algorithm for monitoring the residual resource of galvanic batteries, which provides a correct account of the consumed resource for modes of any duration. A feature of the algorithm is the accounting of the consumed resource through the formation and calculation of conditional single portions, the so-called basic electric charge. For this, a double integration of the voltage proportional to the consumed current is used. Checking the proposed algorithm for monitoring the residual life of the CCS in the program for modeling electrical circuits Electronics Workbench confirmed its feasibility.
Effect of laser treatment on zinced steel surface wettability and corrosion resistance
Authors: Dasaev M R , Kalakuckaya O V , Trushin E S , Grigoriev S V , Ryzhenkov O V 
Published: December 2022

Abstract
The paper presents the results of experimental studies to determine the effect of surface treatment of galvanized steel using laser equipment on wettability properties and corrosion resistance. It is shown that laser texturing of the roughness on the zinc layer contributes to the achievement of the hydrophobic state. It is noted that during ablation and discontinuity of the zinc layer on the steel surface, the hydrophobic state is achieved only due to the formation of molecular layers of the surfactant. An increase in the corrosion resistance of galvanized steel was achieved by activating the zinc layer due to laser texturing of the surface at a radiation density of 20 and 35 J/cm2. With ablation and discontinuity of the zinc layer on the steel surface, the corrosion resistance is significantly reduced.
Improving the quality of bog oak boards using microwave drying chambers
Authors: Shamaev V A , Medvedev I N , Parinov D A , Russu A V , Garkusha O S 
Published: December 2022

Abstract
The stocks of bog oak taken from the bottom of reservoirs are increasingly used to preserve growing valuable species of wood, primarily oak. English oak (Quercus pedunculata Ehrh.) is a hard-drying species. Drying modes of oak boards have been well developed for both convection and microwave drying. The interest in bog oak, rose out from water bodies, sharply increased, but it turned out to be impossible to dry it using known methods other than microwave drying. Cracking defects are 70% at a thickness of 30 mm and 100% at a cross section of 60 mm. The article analyzes the results of bog oak drying in laboratory-type microwave chambers. The distance between magnetrons was 0.5 m, and a length of boards was 1.2 m. A semicommercial plant with a loading volume of 2 m3 and total power of 30 kW was used. Total drying time for boards with a total loading volume of 0.2 m3 was from 3 to 5 days. Cracking defects reduced to 20% for a thickness of 30 mm and to 32% for a thickness of 60 mm (with additional treatment by 40% carbamide solution). Board warping was not noticed.
A comprehensive study of shells with corrugated inner surface
Authors: Yakovlev S S , Karkach L V , Galitsina K A 
Published: December 2022

Abstract
This paper presents the results of a comprehensive assessment of the manufacture of pipes with corrugated inner surface. It examines the technological force, the stressed and deformed states, the probability of defects during corrugation of the pipe at different depths with the help of a rotating working mandrel and the plastic deformation caused by it. The analysis was performed using special QForm software. The study provides the graphs of force, distribution of stress and strain intensity and the probability of defects occurring in the part during corrugation.
Computational study of gas flow characteristics when using intra-nozzle interceptors for thrust vector control
Authors: Brykov N A , Tischenko K A 
Published: December 2022

Abstract
This article proposes the use of cylindrical nozzle interceptors (probes) as an alternative method of rocket engine thrust vector control, which can replace traditional thrust vector control systems. The objective of this paper was to perform a three-dimensional CFD simulation of the gas flow in a rocket engine nozzle with a rod interceptor taken out of the wall without secondary injection, analyzing the calculated flow data and estimating the lateral force. The simulations will be performed in steady-state mode. In the CFD simulations, velocity distribution contours were obtained on the symmetry plane for all positions and values of the interceptor height.
Modelling vortex ring formation, discrete phase intake and transport via formed structure
Authors: Emelyanov V N , Kapranov I E 
Published: December 2022

Abstract
Vortex ring formation using cylindrical tube with open section considered in present research work. Injection of discrete phase in form of solid particles into formation area leads to its involving and further transportation via vortex ring. Numerical simulation in presented work used as main tool. Fluid considered as viscous, incompressible and described by Navier-Stokes equations. Drag law for sphere particles is used. Vortex ring generation factors including geometry and operating parameters as well as location and size of injection area are subjected to analysis.
Focusing of a compression waves in a toroidal bubble cluster
Authors: Gimaltdinov I K , Nasyrov A A , Gimaltdinova A A , Gizzatullina A A , Galimzyanov M N , Yu Kochanova E 
Published: December 2022

Abstract
The dynamics of waves in a cylindrical channel containing a toroidal bubble cluster is studied. It is shown that the existence of a cluster cause of focusing of waves in the channel. The dependence of the maximum amplitude of the compression wave formed in the domain on the parameters of the domain, as well as on the amplitude of the initial pulse, is analyzed.
Soil decompaction of pavement base observed in space and time
Authors: Borovik Vitaly S , Borovik Vitaly V , Borovik Anastasiy V , Lepekhina Daria M 
Published: December 2022

Abstract
It was found that at the time of completion of soil compaction it has content moisture of ∼ 4-8% and, therefore, the osmosis coefficient in the initial period of road use is minimal. The osmosis is mutually eliminated by antiosmosis, which determines the duration of the osmotic period. It was established that the magnitude of the osmosis coefficient is influenced by factors that also affect the parameters of the electric double layer: coefficient of soil compaction, mineral composition, type of exchangeable cations and the concentration of pore solution. The increased density of soil improves the capillary properties of soils and enhances the process of heat and moisture transfer, which makes it possible to make an assumption about the further development of osmotic processes with their subsequent stabilization, provided there are no additional sources of moisture.
Smart device for capturing and transferring honeycomb core for a safe technological cell for cutting honeycomb blocks
Authors: Pikalov Ya Yu , Shtabel N V , Talai E P , Saramud M V 
Published: December 2022

Abstract
The article contains a description of the developed design for the capture and transfer of workpieces from cellular fillers. The capture consists of 3 parts: a vision camera, the image from which is affected in order to determine the optimal points for attaching elements; device for inserting/removing fasteners, detection of electromagnetic and spring-loaded pressing plate; a device for carrying workpieces by assembling fasteners in them. This one was built and tested using the KUKA KR6 R900 robotic arm.
Improving the efficiency of foundation construction in permafrost conditions on the example of the use of geopolymer materials
Authors: Subbotin A S , Kravchenko A A , Dmitrienko A A 
Published: December 2022

Abstract
The development of the natural resources of the North and territories with permafrost is an urgent task for countries located in the northern regions, the solution of which is complicated by extreme climatic conditions. Competent arrangement of the base under any structure is an extremely important task, which is solved only by experienced and qualified specialists. This article describes models with the presented optimal methods and technologies for strengthening and strengthening soils and foundations during the construction and reconstruction of construction projects in the Far North using modern material - cryogel.
Research of the effect of the properties of water-oil emulsions on the work of centrifugal electric pumps
Authors: Sattorov Mirvokhid , Adizov Bobirjon 
Published: December 2022

Abstract
In this article, the formation of highly mineralized water-oil emulsions in Uzbekistan, the complexity of their composition, and the effect of their physical and chemical properties on the operation of centrifugal electric pumps used for the extraction and transfer of this type of oil are described. As the period of use of wells increases, the degree of hydration of the well product also increases, which, in turn, complicates the work of centrifugal electric pumps.
Automation of production mechanisms using energy-efficient asynchronous electric drives based on intelligent converter technology
Authors: Pulatov A A , Shaimiev M F , Mirsaidov U M 
Published: December 2022

Abstract
The article presents a comparative analysis of modern energy-efficient asynchronous electric drives. The differences and similarities of both electric drives are given. The algorithm of operation of an energy-efficient asynchronous electric drive of a pumping station is given.
Study of the issues of determining the parameters of the flexural rigidity of saw working bodies
Authors: Muradov Rustam , Abduvakhidov Mubashirkhon , Abduvakhidov Mutakhhirkhon 
Published: December 2022

Abstract
The article investigates the issue of determining the flexural rigidity of a gin saw cylinder formed by tying onto a shaft a package of disks having the same thickness at different diameters and compressed by a longitudinal compressive force. The stated problem is solved on the basis of the general rules of theoretical mechanics and force analysis. Due to the lightening of the elements of the saw cylinders, its design is improved, the general functions of the bending rigidity of the saw cylinder, the thickness of the elements, the magnitude of the friction force between them are obtained. A method and device for assembling saw cylinders has been developed, which makes it possible to increase in the consumption of saws and gaskets by a value limited by the strength only to the impact of the shaft and by regulating to increase in dynamics with a high probability.